What do you all think? The only thing there to help fuel delivery is a Walbro 255lph HP, and a Haltech E6K.



Do you all think its possible? ( nevermind all the "is it efficient" b.s. )

Yes. But how long would you give the engine? .2 secs? https://www.nopistons.com/forums/pub...DIR#>/wink.png



Stock fuel system is maxxed at 11psi...

11psi? https://www.nopistons.com/forums/pub...1047683664.gif





I think its safe to assume youve never had your car past 11psi, eh?

yea i've heard that 11 psi is the max it'll handle

Haltech or no haltech..the 550cc injectors will fail at fullfilling a 19psi pull...unless the duty cycle is maxed and it creeps to 19psi, but not a steady 19psi.



Stock IC handles 10psi "OK" but I wouldnt be shocked to see it fall apart, per say, at 19psi....the rubber IC lines probably wont even hold.



Stock APEX seals take 22psi with the best tuning.



that fuel pump helps, but 19psi takes more then standalone and upgraded fuel pump...



Basically, my answer is NO! lol..



BTW, I have driven/worked on rx7s boosting more then 19psi if you wondering if i have experience with this...

Another quick note...



then stock fuel system will go past 11psi as long as its a creep, but you cant pound more then 11psi through 1st, 2nd or 3rd, etc...



normally a TII w/ open exhaust will creep up to 13-15psi on stock fuel system(ask ILUV88 and his AE,lol)...



also, my buddy's '87TII(roadkill669 on the forum) goes up to 14psi regularly if you floor it in 5th...



Of course, I noticed that in ur list of mods...no turbo is mentioned, the stock H18 will def not make 19psi,lol...

so he knows his ****

https://www.nopistons.com/forums/pub...1047683561.gif



Yea you can run more than 11psi, but you'll go lean fast.



I have drove a t2 at 15psi, with just a fuel pump.. Guess what? It blew a week later....



If you think im full of ****, go ahead run 19psi on basically stock fuel system, LOL https://www.nopistons.com/forums/pub...1047683785.gif

Hmmm...Just as I thought.









The funny thing about all this is that last night I was running 19psi for the entirety of the night ( I tightned my boost controller too much https://www.nopistons.com/forums/pub...IR ). It didnt creep. It just smacked right up to 19psi and held through all gears. Pulled VERY hard too.



Kinda makes me wonder where you all are getting all youre information...Is it all just second hand stuff? Has anyone here in this thread ( aside from me ) actually tried 19psi? Or even 15psi? I run my car at 15psi daily with no problems on stock injectors/IC.

https://www.nopistons.com/forums/pub...1047683561.gif



Yea you can run more than 11psi, but you'll go lean fast.



I have drove a t2 at 15psi, with just a fuel pump.. Guess what? It blew a week later....



If you think im full of ****, go ahead run 19psi on basically stock fuel system, LOL https://www.nopistons.com/forums/pub...1047683785.gif [/quote]

My car has ran at 15psi for a good while and its still running strong.





And I did run 19psi. It felt really nice. I wanted to do it some more but thought better of it.

that little HT18 isn't moving much air at 19psi.....and its gonna start puking oil soon but 550x4 with correct tuning should be able to give enough fuel for 20psi. there are so many factors!! you have to check your fp with a gauge. hopefully your injectors are clean etc. my old T2 lasted two days @ 15-17psi but i did have a T04 upgrade on it so it was pushing more air than a stock turbo

its depends, the 20b has 550's all the way around and its running around 12:1 afs at 75% duty @12psi, so theres more injector. the austrailians run the stock injectors at 15psi all day long. if you have the stock turbo the difference in flow between 15 and 19 psi might not be much, i know on the 20b i'm maxxed out around 12-13psi, 14psi doesnt need any more fuel.



of course if you do have a stock turbo look for it to die really fast.



you might take some timing out and add some fuel pressure if you can, with the injectors maxxed its gonna be leaner on a cold night



mike

https://www.nopistons.com/forums/pub...1047683561.gif



Yea you can run more than 11psi, but you'll go lean fast.



I have drove a t2 at 15psi, with just a fuel pump.. Guess what? It blew a week later....



If you think im full of ****, go ahead run 19psi on basically stock fuel system, LOL https://www.nopistons.com/forums/pub...1047683785.gif [/quote]

My car has ran at 15psi for a good while and its still running strong.





And I did run 19psi. It felt really nice. I wanted to do it some more but thought better of it. [/quote]

I wish I could afford to experiment like that https://www.nopistons.com/forums/pub...#>/biggrin.png



"Cartech found that the large injectors and the aggressive fuel curve afforded by the stock EFI rendered a correct air/fuel mixture to a level of about 8 psi without lowering discharge temperatures; with other improvements, it was possible to run safely to the 11 psi range before additional modification to the fuel system was required. "





Grassroots Article



These guys know what they are talking about.. But then again this was with a stock ecu, I bet the stock ecu can't push the injectors past 65% duty cycle, or maybe i'm just wrong...

But this got me curious, I believe 550 x 4 x 85% s/b enough fuel for about 280rhwp... stock motor/turbo 280rhwp would be near like 17psi... https://www.nopistons.com/forums/pub...1047683561.gif

Can you get on a dyno or do you have access to a wb o2?

the stock ecu will run something around 85-90% injector duty, but it also runs a lot of timing



mike

my infornation is based on my own experiences while tuning. At 10psi past 6k with stock injectors and a standalone, i was seeing A/F dropping lower than 12.5:1 which is getting a little bit on the dangerous side in my opinion. Past 10 or 11 you aren't making much more power just more heat, I am running a front mount also and i wouldn't run my car past 6k until i had larger injectors.

adaml...can i buy ur car RIGHT now, dont drive any more...I just want to save a S5 TII https://www.nopistons.com/forums/pub...#>/biggrin.png

https://www.nopistons.com/forums/pub...1047683561.gif



Yea you can run more than 11psi, but you'll go lean fast.



I have drove a t2 at 15psi, with just a fuel pump.. Guess what? It blew a week later....



If you think im full of ****, go ahead run 19psi on basically stock fuel system, LOL https://www.nopistons.com/forums/pub...1047683785.gif [/quote]

My car has ran at 15psi for a good while and its still running strong.





And I did run 19psi. It felt really nice. I wanted to do it some more but thought better of it. [/quote]

I wish I could afford to experiment like that https://www.nopistons.com/forums/pub...#>/biggrin.png



"Cartech found that the large injectors and the aggressive fuel curve afforded by the stock EFI rendered a correct air/fuel mixture to a level of about 8 psi without lowering discharge temperatures; with other improvements, it was possible to run safely to the 11 psi range before additional modification to the fuel system was required. "





Grassroots Article



These guys know what they are talking about.. But then again this was with a stock ecu, I bet the stock ecu can't push the injectors past 65% duty cycle, or maybe i'm just wrong...

But this got me curious, I believe 550 x 4 x 85% s/b enough fuel for about 280rhwp... stock motor/turbo 280rhwp would be near like 17psi... https://www.nopistons.com/forums/pub...1047683561.gif

Can you get on a dyno or do you have access to a wb o2? [/quote]

Yeah. Im taking it to a dyno this friday. Its going to be running 15psi then.

I can personally testify that going from 11->15 is a very big difference in power. at 15psi, my front end starts to get light and itll lock my seatbelts from a roll in 3rd.

Please https://www.nopistons.com/forums/pub...>/rolleyes.gif This car has been saved already.



The only thing different about the way you and I work on our cars is that I actually push it to see what it can do instead of just taking someone elses word without any real proof...

Yeah. Like I said, Ive been running 15psi for a while now and have absolutely no problems. No low compression, no smoke under boost/vacuum, perfect rock steady idle, no shaft play...I mean the car is perfect.



I think the car is tougher than you all think...

And Ive still yet to see any real data about how much air the HT-18 flows...Or how efficiently it does it.

https://www.nopistons.com/forums/pub...1047683561.gif



Yea you can run more than 11psi, but you'll go lean fast.



I have drove a t2 at 15psi, with just a fuel pump.. Guess what? It blew a week later....



If you think im full of ****, go ahead run 19psi on basically stock fuel system, LOL https://www.nopistons.com/forums/pub...1047683785.gif [/quote]

My car has ran at 15psi for a good while and its still running strong.





And I did run 19psi. It felt really nice. I wanted to do it some more but thought better of it. [/quote]

I wish I could afford to experiment like that https://www.nopistons.com/forums/pub...#>/biggrin.png



"Cartech found that the large injectors and the aggressive fuel curve afforded by the stock EFI rendered a correct air/fuel mixture to a level of about 8 psi without lowering discharge temperatures; with other improvements, it was possible to run safely to the 11 psi range before additional modification to the fuel system was required. "





Grassroots Article



These guys know what they are talking about.. But then again this was with a stock ecu, I bet the stock ecu can't push the injectors past 65% duty cycle, or maybe i'm just wrong...

But this got me curious, I believe 550 x 4 x 85% s/b enough fuel for about 280rhwp... stock motor/turbo 280rhwp would be near like 17psi... https://www.nopistons.com/forums/pub...1047683561.gif

Can you get on a dyno or do you have access to a wb o2? [/quote]

Yeah. Im taking it to a dyno this friday. Its going to be running 15psi then. [/quote]

Sweet.

https://www.nopistons.com/forums/pub...1047683561.gif



Yea you can run more than 11psi, but you'll go lean fast.



I have drove a t2 at 15psi, with just a fuel pump.. Guess what? It blew a week later....



If you think im full of ****, go ahead run 19psi on basically stock fuel system, LOL https://www.nopistons.com/forums/pub...1047683785.gif [/quote]

My car has ran at 15psi for a good while and its still running strong.





And I did run 19psi. It felt really nice. I wanted to do it some more but thought better of it. [/quote]

I wish I could afford to experiment like that https://www.nopistons.com/forums/pub...#>/biggrin.png



"Cartech found that the large injectors and the aggressive fuel curve afforded by the stock EFI rendered a correct air/fuel mixture to a level of about 8 psi without lowering discharge temperatures; with other improvements, it was possible to run safely to the 11 psi range before additional modification to the fuel system was required. "





Grassroots Article



These guys know what they are talking about.. But then again this was with a stock ecu, I bet the stock ecu can't push the injectors past 65% duty cycle, or maybe i'm just wrong...

But this got me curious, I believe 550 x 4 x 85% s/b enough fuel for about 280rhwp... stock motor/turbo 280rhwp would be near like 17psi... https://www.nopistons.com/forums/pub...1047683561.gif

Can you get on a dyno or do you have access to a wb o2? [/quote]

Yeah. Im taking it to a dyno this friday. Its going to be running 15psi then. [/quote]

Sweet. [/quote]

Ill post the numbers when i get back but Im not really going for the par numbers. Just really care about tuning the A/F and Ign. Its on a mustang dyno anyways https://www.nopistons.com/forums/pub...IR#>/wacko.png

Yea, I just read the same thread at rx7club, I figured there was multiple topics, anyhow, someone said on their microtech they were seeing 90% duty cycle on the stock fuel system at 11psi, isn't that hard enough data for you that you are running lean? https://www.nopistons.com/forums/pub...R#>/unsure.png

if you up the fuel pressure you can get more out of those 550's.

yes I know that but how much more?

yah they are generlly pretty tough, on a friends car they were running a stock turbo with the wastegate disconnected, and it lasted 3-4 track events and the 300-400 miles each trip in between, before it blew up. the motor is fine, its got 1600 secondaries, but the turbo will now empty all of the oil in about 200feet



mike

until they fail and you blowup https://www.nopistons.com/forums/pub...#>/biggrin.png

Duty cycle on my haltech ( @ 11psi ) is nowhere near 90%.



Besides, duty cycle is worthless without a A/F ratio to match it. I could run 100% duty cycle...but that doesnt mean Im lean. It could mean Im just super dog ass rich.

yah they are generlly pretty tough, on a friends car they were running a stock turbo with the wastegate disconnected, and it lasted 3-4 track events and the 300-400 miles each trip in between, before it blew up. the motor is fine, its got 1600 secondaries, but the turbo will now empty all of the oil in about 200feet



mike [/quote]

Ouch. Thats bad times indeed.





Just for the record, Im not saying Im running 19psi all the time. I just did it one night by accident. And decided to try it out for a little bit. I turned it back down to 13-14.

Yea..cuz this is the first motor to be in my car https://www.nopistons.com/forums/pub...DIR#>/wink.png



Oh, and this is my first rx7, first turbo car, first attempt at tuning, MWAHAHAHAAAA.







ASS! lol....and I hope u caught the sarcasm in my post.

Yea..cuz this is the first motor to be in my car https://www.nopistons.com/forums/pub...DIR#>/wink.png



Oh, and this is my first rx7, first turbo car, first attempt at tuning, MWAHAHAHAAAA.







ASS! lol....and I hope u caught the sarcasm in my post. [/quote]

I didnt really...but whatever.





Im just curious on where all you all get your "facts". Are they just things you hear other people say and youre quoting it as truth? Or have you actually seen data ( compressor maps... ) or experienced yourself?



Ive just come to realization that a few of the "facts" that I used to always hear, dont seem to be too factual anymore...

All bitching aside...





I don't repeat what others say. I consider myself very skilled with rx7s. I began workin on them at the age of 7, before I really even knew what the hell the car was. Granted at 7 years old i just handed my dad his tools as he tweaked his '83, but nonetheless I grew from there. I have since modified over 11 FC rx7s nonturbos to run under 13s, and have built 4 under 12s TurboFCs. My current vehicle is an '88 SE converted to a Jspec GTX w/ new SP motor, etc.



I have over 12years of rotary experience, and I like to think of at least 8 of them as being "good years"(aka..not helping my dad). I have come across a lot of guys who have built FCs, FDs, etc running some boost and talkin ****..some know their stuff, some dont, but what i never hear is one of them questioning my help or opinions. Either take the advice, or dont. Its not my car your working on.

If theyre not questioning youre advice, then theyre just blindly being led.



Questioning things allows you to better understand things and affords you the opprotunity to learn more on a subject.



I didnt ask for youre whole life history, and just because you can make a car go fast doesnt mean you really know whats going on with it. All I wanted to know is where you all get your data for statements such as the inefficiency of the stock turbo above X psi, or the inability of 4x 550cc injecotors and a fuel pump to support more than X psi.

If theyre not questioning youre advice, then theyre just blindly being led.



Questioning things allows you to better understand things and affords you the opprotunity to learn more on a subject.



I didnt ask for youre whole life history, and just because you can make a car go fast doesnt mean you really know whats going on with it. All I wanted to know is where you all get your data for statements such as the inefficiency of the stock turbo above X psi, or the inability of 4x 550cc injecotors and a fuel pump to support more than X psi. [/quote]

First of all I am NOT a TII guy but here goes.

I hope you saw the irony in your quoted statement.



People tell you not to go to 15+ PSI on stock stuff because others on these forums have BLOWN their turbo's and engines before you and that is EVIDENCE and PROOF of the stock system's limitations. You apparently don't want to hear that. Go ahead and run 35PSI on the stock turbo who cares it IS afterall your money. You have already been told that there are NO graphs for the stock turbo since its not "off the shelf" like others(aftermarket turbos). You have been told how to make your own turbo graph. stop bitching at other wiser people than you they are trying to keep you from hurting your car.



You told Rotaryman88 that just because he knows how to make a car go fast doesn't mean he know about the cars internal working and what is really going on. Well what do you know? All you did was **** up and tighten your MBC too much. You don't know anything as to what is really happening either. You didn't know anything when you ran 19PSI all you did was a VERy crude test that consisted of two results.



a. Engine is ok and nothing happened https://www.nopistons.com/forums/pub...1047683329.gif

b. Engine go boom https://www.nopistons.com/forums/pub...1047683664.gif



You aren't doing things scientifically.

Go to the dyno and check your AFR's you will see That you are not running in a safe way. What you "FEEL" has nothing to do with the REAL numbers comming from a dyno with different PSI runs.

If I get in my car my N/A!! it feels great but that doesn't mean I have 300HP it just means my ass is in the seat and nothing more. Your mind tells you things its not a scientific way of measuring anything. Brains are not car tuning equipment dynos are so get out there and come back to the real world.

If theyre not questioning youre advice, then theyre just blindly being led.



Questioning things allows you to better understand things and affords you the opprotunity to learn more on a subject.



I didnt ask for youre whole life history, and just because you can make a car go fast doesnt mean you really know whats going on with it. All I wanted to know is where you all get your data for statements such as the inefficiency of the stock turbo above X psi, or the inability of 4x 550cc injecotors and a fuel pump to support more than X psi. [/quote]

First of all I am NOT a TII guy but here goes.

I hope you saw the irony in your quoted statement.



People tell you not to go to 15+ PSI on stock stuff because others on these forums have BLOWN their turbo's and engines before you and that is EVIDENCE and PROOF of the stock system's limitations. You apparently don't want to hear that. Go ahead and run 35PSI on the stock turbo who cares it IS afterall your money. You have already been told that there are NO graphs for the stock turbo since its not "off the shelf" like others(aftermarket turbos). You have been told how to make your own turbo graph. stop bitching at other wiser people than you they are trying to keep you from hurting your car.



You told Rotaryman88 that just because he knows how to make a car go fast doesn't mean he know about the cars internal working and what is really going on. Well what do you know? All you did was **** up and tighten your MBC too much. You don't know anything as to what is really happening either. You didn't know anything when you ran 19PSI all you did was a VERy crude test that consisted of two results.



a. Engine is ok and nothing happened https://www.nopistons.com/forums/pub...1047683329.gif

b. Engine go boom https://www.nopistons.com/forums/pub...1047683664.gif



You aren't doing things scientifically.

Go to the dyno and check your AFR's you will see That you are not running in a safe way. What you "FEEL" has nothing to do with the REAL numbers comming from a dyno with different PSI runs.

If I get in my car my N/A!! it feels great but that doesn't mean I have 300HP it just means my ass is in the seat and nothing more. Your mind tells you things its not a scientific way of measuring anything. Brains are not car tuning equipment dynos are so get out there and come back to the real world. [/quote]

GTFO. I never said I was doing things "scientifically". I admitted it was an accident. And I never claimed I knew everything about how these cars work.



All I asked for was some actual data instead of hearsay.



Its also not just what I feel. If you bothered to read, I was referencing my car against a good buddies car and a particular stretch of road.

BDC said on rx7club he might have a turbo graph for you. Hopefully then you will shut up.

Oh and if you already did it on your car why are you asking us about it? Then telling everyone they don't know anything? Don't come on here and ask for advice then talk crap about people experiences and oppinions.



The simple answer to your question is YES why? because you already did it. So don't ask what you have already done.

thats the hard part because we're dealing with different cars with different mods etc. i can tell you my 20b does 10psi @77% injector duty. i can tell you that ive dynoed more hp at 10psi than 12psi.



i can tell you my friend runs 14psi on a stock fc turbo in his fd, gd runs 14:1 afr on the dyno @400+rwhp. ive seen lots of combos that shouldnt work but that do



mike

Smells like Rx7club in here..... https://www.nopistons.com/forums/pub...1047683358.gif

i have my hat on backwards too