OK I have been searching around and cant seem to find a definitve answer to this, maybe because not alot of people have done it.





I have stock S5 turbo which is creeping to 20 psi in 3rd gear, maybe even more, I dont want to venture further to find out.



My question is that who out there has ported there wastegate and has it worked? Were you hitting approx your desired boost pressures? Did you have to do any custom work to the turbo?



It was pointed out to me that porting the wastegate alone would not get me to the the desired PSI levels I am shooting for, 12-14psi. They said that the w/g would have to be vented to the atmosphere through custom work to the turbo......



Some other info about the setup:

Intake, full 3 inch exhaust, stock S5 turbo, Haltech E6X



Any help here would be great because I cannot afford to upgrade to a big single right now so I want to be able to run the stock turbo at low enough boost to where it wont start wearing out to quickly.

You should probably check your wastegate connections n ****. Also what boost controller do you have.

He doesn't have a boost controller, and his w/g connections are solid. I am going to test the wastegate if and when I get the turbo back in the shop.



For now I just ported the wastegate runners and the angle at which the exhaust enters the w/g runner. I also milled out the backplate and the top of the door to allow further travel of the door. I'm curious to see how well it works out.



If it doesn't I am going to make a seperate dump tube for the w/g that vents to the atmosphere.

either somethings not flowing or our turbos are bad, but with an s5 turbo and a full open exhaust i'm having trouble getting MORE than 10-12psi. mine was running .5bar and once i put the cat in boost is spiking to .8-.9 in the upper gears.



mines a stock s4 with an intake, fcon, s5 turbo and rb exhaust

the other car is an s5 t2 with an e6k and 3" exhaust



both cars are running stock unported wastegates

I ran the same setup on my car for nearly 3 years. I had to beg, plead, and practically make a deal with the devil to get the turbo to hold 14psi of boost.



There is something else amiss with your setup.

Your having trouble MAKING boost that high with wide open exhaust liek that?? That is very strange. A friend of mine was running almost the same setup on his s5 t2 except he had 2.5 inch dp/mp, but he was still making 17-18 psi under high loads.



Anyways, ran the car and the porting definetly worked. Under high loads like 4th gear I am making 10-12 psi right now, So hopefully with a boost controller I will be able to turn that up just a bit.

[quote name='spooliNrx7' date='May 22 2005, 12:01 PM']Your having trouble MAKING boost that high with wide open exhaust liek that?? That is very strange. A friend of mine was running almost the same setup on his s5 t2 except he had 2.5 inch dp/mp, but he was still making 17-18 psi under high loads.



Anyways, ran the car and the porting definetly worked. Under high loads like 4th gear I am making 10-12 psi right now, So hopefully with a boost controller I will be able to turn that up just a bit.


[/quote]



you're missing the point. the lower the flow, the higher the boost. the more free flowing my exhaust is the lower my boost is. if YOU are hitting 18psi, something is not flowing as it should

He has a 3" thunderfabrications downpipe/midpipe with the Apex N1 exhaust...



I have seen more than a handful of stock turbo FC3S with full 3" exhaust hit over 17psi....



Anyhow I'm suprised it work.

I have a stock s5 turbo and a EBC and have no problems dialing in the exact boost I want. No spikes or problems.



I set it at 8lbs and it will hold all the way to redline.

I set it at 15lbs and it holds all the way to redline.

[quote name='1Revvin7' date='May 22 2005, 09:43 PM']He has a 3" thunderfabrications downpipe/midpipe with the Apex N1 exhaust...



I have seen more than a handful of stock turbo FC3S with full 3" exhaust hit over 17psi....



Anyhow I'm suprised it work.


[/quote]



n1 single? thats the problem right there.

[quote name='j9fd3s' date='May 24 2005, 09:40 PM']n1 single? thats the problem right there.


[/quote]



He has the dual.



On my previous setup I had the thunderfab 3" dp/mp with the restrictive RP 52mm catback, and once I hit 3rd gear it was a steay 14psi to 8500+rpms. That was with a ported s4 wastegate.



GMON has the n1 single catback.

[quote name='1Revvin7' date='May 24 2005, 07:35 PM']He has the dual.



On my previous setup I had the thunderfab 3" dp/mp with the restrictive RP 52mm catback, and once I hit 3rd gear it was a steay 14psi to 8500+rpms. That was with a ported s4 wastegate.



GMON has the n1 single catback.


[/quote]



s4 will creep.



i have the rb turboback. i get no creep at all with an s5 turbo. until i put the cat in, then it went from 8psi to hitting 12-13 in the midrange

Whats Matt using for boost control. An EBC was the best investment after the ems and wideband that I have made. Makes life much easier.

[quote name='Impact Blue' date='May 24 2005, 10:54 PM']Whats Matt using for boost control. An EBC was the best investment after the ems and wideband that I have made. Makes life much easier.


[/quote]





Damit, Mike was checkin his email on my computer. That last post was me.... https://www.nopistons.com/forums/pub...IR#>/wacko.png

Right now I just have a vacuum line to the w/g controlling the boost. I usually have a Turbo XS and it will be going in shortly, just wanted to get the car running tip top before I started turning up boost. The wastegate porting worked. Under full load as in 4th gear I am now only hitting like 10psi, so with that boost controller hopefully I can turn that up a bit.



It's so freakin hot here in phoenix though I am going to install my water injection befroe I drive it anymore.

Thats very interesting. I wonder why mine does not see that problem without the ported wg. The s5 is going away shortly but its still kinda fun to figure this stuff out. Matt, is your engine ported? Maybe thats what it is?? https://www.nopistons.com/forums/pub...1047683561.gif

[quote name='GMON' date='May 25 2005, 03:33 PM']Thats very interesting. I wonder why mine does not see that problem without the ported wg. The s5 is going away shortly but its still kinda fun to figure this stuff out. Matt, is your engine ported? Maybe thats what it is?? https://www.nopistons.com/forums/pub...1047683561.gif


[/quote]



Exactly. We all wouldn't mind figuring it out, but its kindof pointless. Stock turbos suck.

Dunno if its any help, but here's what I've experienced, sorta like you guys:



Setup:

Streetported S5 TII block

8.5:1 S4 rotors (not my choice)

S5 rebuilt stock turbo with BNR ported wastegate, no other mods

Haltech E6X for management

GReddy FMIC

Cone intake on the turbo (Bonez)

RX-7.com downpipe, custom 3" midpipe, RX-7.com 2.5" dual catback, no cats or emissions control at all



Ok, the data:



Scenario 1, wastegate actuator arm falls OFF the actuator:

1st and 2nd gear: Spools late (4-5k), starts low like 4-5 psi and peaks at ~7 psi around 5.5-6k then falls off rapidly again to 4ish by 8k.

By 5th gear: boost creeps to ~11 psi, but same basic profile and shitty spool time.



Scenario 2, wastegate connected to compressor outlet directly by hose:

1st gear: positive boost by about 3k, ~7 psi by 4k, peaks at maybe ~9 by 5500.

4th gear: similar but creeps to ~11.5 psi at 5.5k and drops to 7 by 8k.



I dynoed 230 rwhp on Scenario 2's setup, and on the dyno was only hitting 6 psi creeping to 9 in 4th gear, which was slightly odd given the highway results just mentioned. But that's what I got.



Scenario 3, Profec B:

So far, with only an hour or so of tuning and that was mostly trial and error while driving so not much got done, I'm hitting 12 psi solid, dropping to about 9 at 8k, but spools to 12 at or before 4k rpm and lag is greatly reduced (on the order of 1 full second now, from vacuum to full boost, in 4th gear above 4k rpm, when floored suddenly). I think we can probably tune it to be even better, I just gotta tweak the unit.



Anyway, that's my data for ya to chew on.

You know that is a very good point Greg. The engine WAS rebuilt in 94, its stamped on the side of the housings.....it is very possible that maybe it is slightly ported. We wont know for sure though until I open it up someday to port it and rebuild it.



The wierd thing is though that Brandons car did the same thing when he had RB dp/mp and the APEXi N1 duals, and his motor definitely was not ported.



[quote name='GMON' date='May 25 2005, 12:33 PM']Thats very interesting. I wonder why mine does not see that problem without the ported wg. The s5 is going away shortly but its still kinda fun to figure this stuff out. Matt, is your engine ported? Maybe thats what it is?? https://www.nopistons.com/forums/pub...1047683561.gif


[/quote]

[quote name='DigitalSynthesis' date='May 25 2005, 08:01 PM']Dunno if its any help, but here's what I've experienced, sorta like you guys:



Setup:

Streetported S5 TII block

8.5:1 S4 rotors (not my choice)

S5 rebuilt stock turbo with BNR ported wastegate, no other mods

Haltech E6X for management

GReddy FMIC

Cone intake on the turbo (Bonez)

RX-7.com downpipe, custom 3" midpipe, RX-7.com 2.5" dual catback, no cats or emissions control at all



Ok, the data:



Scenario 1, wastegate actuator arm falls OFF the actuator:

1st and 2nd gear: Spools late (4-5k), starts low like 4-5 psi and peaks at ~7 psi around 5.5-6k then falls off rapidly again to 4ish by 8k.

By 5th gear: boost creeps to ~11 psi, but same basic profile and shitty spool time.



Scenario 2, wastegate connected to compressor outlet directly by hose:

1st gear: positive boost by about 3k, ~7 psi by 4k, peaks at maybe ~9 by 5500.

4th gear: similar but creeps to ~11.5 psi at 5.5k and drops to 7 by 8k.



I dynoed 230 rwhp on Scenario 2's setup, and on the dyno was only hitting 6 psi creeping to 9 in 4th gear, which was slightly odd given the highway results just mentioned. But that's what I got.



Scenario 3, Profec B:

So far, with only an hour or so of tuning and that was mostly trial and error while driving so not much got done, I'm hitting 12 psi solid, dropping to about 9 at 8k, but spools to 12 at or before 4k rpm and lag is greatly reduced (on the order of 1 full second now, from vacuum to full boost, in 4th gear above 4k rpm, when floored suddenly). I think we can probably tune it to be even better, I just gotta tweak the unit.



Anyway, that's my data for ya to chew on.


[/quote]



That is basically what mine is doing now. It doesnt spool like it did before I had the w/g ported. Before it was, I was at 8psi in 1st by 4k and 14psi by about 4500 in 2nd gear.



Now in 1st it takes it a little longer to spool up and only reaches about 6-7 psi, and maz boost is like 10 psi and thats in 4th gear and not full boost until 5500k+

I seriously doubt the motor is ported.

I have a ported s5 engine with a s5 turbo in my TII. I running the rb 3" trubo back exhaust. I was getting a solid 10 psi with a ported wastegate. I later took out the turbo and ported the turbine inlet to even out the runners and smooth them out. I ported the inlet to the wastegate, i mean i ported the **** out of it and i polished the crap out of the curves from the turbo into the wastegate. You have to be careful when you redirect the flow into the wastegate since some areas dont have much material behind it. After this i hit 8psi, the boost is a little bit more responsive. The car seems to pull just as hard as it did at 10psi.

I've never had any problems with my TIIs except for the time i ran a 3" single exhaust then i was hitting way too much boost creep.

jusr realized this thread was a year old... lol I do this too many times.