NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   Single Turbo Discussion (https://www.nopistons.com/single-turbo-discussion-13/)
-   -   Rx6 Vs Gt35/40 (https://www.nopistons.com/single-turbo-discussion-13/rx6-vs-gt35-40-a-12480/)

suprfast 02-18-2003 01:04 AM

anyone have any dyno sheets or numbers for the apexi turbo and the gt35/40. just looking to see how much of a difference the spool rates are. i hear that the rx6 spools damn fast, but how fast is damn fast. also hear that the 35/40 isnt much slower than stock. just trying to get some insight on where my money should be going. i know that the rx6 has yet to see anything over the 420hp mark but the 35/40 has seen almost 500hp. these kind of questions seem to not be allowed on the other forum. thanks

kris

1Revvin7 02-18-2003 11:21 AM

Usually the rx6 doesn't make more than 360rwhp, that kit really isn't much of an upgrade from the stock twins powerwise, but it does clean up/ and make things more reliable. What are you looking for? I'm assuming a streetcar, as these turbos are definatly not drag units. I would say you would be way better off with the gt 35/40.

j9fd3s 02-18-2003 12:40 PM

the rx6 feels like its a hair slower than stock, it has 10-12psi by 2500rpms



mike

A-spec Tuning 02-18-2003 12:49 PM

The boost curve on a 35/40 seems to go as follows you will see positive boost by 2200rpm, 7psi by 2500, 10 psi by 2700, 15psi by 3300,this of coarse may very alittle depending on other things. I've got alot of experience with both and I wouldn't even consider the rx-6 anymore, it's great turbo kit don't get me wrong, but you have alot more room to grow with 35/40 and it can be rebuilt locally.



Thanks,Sean

Srce 02-18-2003 02:54 PM

Offtopic sorry, Hey Sean, how much do you guys charge for boost verification and a compression check for an FD. I'm buying a 3rd. Gen in a little while so I'd like to know. Thanks

1Revvin7 02-18-2003 04:25 PM


Originally Posted by Srce94FD' date='Feb 18 2003, 03:54 PM
Offtopic sorry, Hey Sean, how much do you guys charge for boost verification and a compression check for an FD. I'm buying a 3rd. Gen in a little while so I'd like to know. Thanks

Pm foo.

94touring 02-18-2003 04:29 PM

Go with the 35/40, its gona spool up just as quick as the rx6 but have a ton more potential for power. The gt35/40 is really the hottest turbo right now, great for the street and good for the strip. The max you are really gona get out of the rx6 is around 400rwhp anyways, most the time you see around 370ish plus or minus.

suprfast 02-23-2003 04:47 PM

whoa, havent been here for a long time. thanks for the input. what im looking for is something that is streetable yet gives me fast spool. im a heavy autoXer and love road races. i do maybe 2 drag races a year just to see how my mods are adding up. i need the low end. i like the stock twins, but everytime something goes wrong i have to take off a thousand hoses to fix the problem. if i was going to spend over 2K on the BNR's(which i dont think i will), i might as well save up a tad more for something that is completely new and not rebuilt. im not docking the BNR's just from what i have heard about the 35/40 is bad ass. give me everything there is to know about the 35/40 people.

thanks

kris

94touring 02-23-2003 05:01 PM

Silverninetythreee made 435rwhp @15psi and 470rwhp @20psi on the gt35/40. As a-spec-tuning said, you will typically see 15psi by 3300rpms, which isn't that far off stock and obviously much quicker spooling than say a t-78.

Badog 02-23-2003 11:45 PM

If you're going to do it, you could do it better than right. Spend the (unexpected) money on a Pineapple Nocab-ported engine, a GT35/40, and come hither and let me tune you for 550RWHP at under 21psi.



I've tuned a couple of Rx6s, and they in no way compare to a GT35/40. Even stock block cars. Put that baby on a Pineapple engine and you go, now!

Leetheslacker 02-24-2003 10:47 AM

EEeeek! Another person from the hole! https://www.nopistons.com/forums/pub...IR#>/blink.png

Jodeny 02-28-2003 12:31 PM


Originally Posted by 94touring' date='Feb 23 2003, 06:01 PM
Silverninetythreee made 435rwhp @15psi and 470rwhp @20psi on the gt35/40. As a-spec-tuning said, you will typically see 15psi by 3300rpms, which isn't that far off stock and obviously much quicker spooling than say a t-78.

How long did his motor last??

John

vosko 02-28-2003 12:33 PM

hmmm i made 415rwhp @ 10psi and 459 rwhp @ 15psi.....

apexkw 02-28-2003 12:46 PM


Originally Posted by vosko' date='Feb 28 2003, 01:33 PM
hmmm i made 415rwhp @ 10psi and 459 rwhp @ 15psi.....

with what setup?

vosko 02-28-2003 02:33 PM

T78 and ito port https://www.nopistons.com/forums/pub...IR#>/boink.gif

94touring 02-28-2003 03:24 PM


Originally Posted by Jodeny' date='Feb 28 2003, 10:31 AM
How long did his motor last??

John

He had some sort of a tuning problem and blew not too long ago. You'd have to ask him for exact miles.

r_xplicit 03-01-2003 09:21 AM

550 @ 18-20psi.....wow, that would be something to see......i like the sound of that...

kahren 03-09-2003 11:30 PM

uhh, from what i have seen, dyno charts, the gt35/40 has about 75 hp at 3k rpms, and the rx has about 100 hp at 3k rpms, that is a BIG diffrence, stock is about 110 hp, t78 is about 75 hp at 3k rpm as well. and the t04e is about 100 hp as well (non ball bearing) as u can see the rx6 and the t04e are about the same producing about the same hp up top at 13 psi about 360 at wheels.



i really dont see how the gt3540 is a fast spooling turbo other then when it starts to spool it spools faster then somethign say a t78, the gt3540 gives u a better spool and more power sooner, but the t78 has a better tq curve.



now u decide what u want https://www.nopistons.com/forums/pub...DIR#>/wink.png

94touring 03-10-2003 12:52 AM


Originally Posted by kahren' date='Mar 9 2003, 09:30 PM
uhh, from what i have seen, dyno charts, the gt35/40 has about 75 hp at 3k rpms, and the rx has about 100 hp at 3k rpms, that is a BIG diffrence, stock is about 110 hp, t78 is about 75 hp at 3k rpm as well. and the t04e is about 100 hp as well (non ball bearing) as u can see the rx6 and the t04e are about the same producing about the same hp up top at 13 psi about 360 at wheels.



i really dont see how the gt3540 is a fast spooling turbo other then when it starts to spool it spools faster then somethign say a t78, the gt3540 gives u a better spool and more power sooner, but the t78 has a better tq curve.



now u decide what u want https://www.nopistons.com/forums/pub...DIR#>/wink.png

Well not exactly, I made around 75rwhp on my apexi turbo at 3k rpms. Silver ninety three also made about 75-80rwhp at 3k rpms on his dyno sheet using the gt35/40. Compared to Vosko's t-78 dyno I made 20 more rwtq with the apexi turbo, so the t-78 doesn't necessarily make more torque than the apexi or gt35/40 (at street boost levels). Power potential for the gt35/40 and t78 is much higher than the apexi turbo. Porting has a large effect on some of these low rpms power numbers. I'm more concerned with power from 4k-8k than from idle to 3k, 75rwhp is plenty to push me to work and back everyday.

richierich 03-10-2003 07:11 AM

I have a Rx6 for about a year now, and I have only positive things to say about it. I have had tons of mods to go along with it, but I have gotten 467 to the rear wheels, but that is at 18psi. 14 psi I get 411. I consistanly run in the low 11s with street tires and I do many trackdays and it works very well. It is a killer set up for autoxing. There is almost no lag. ( just my two bits)

apexkw 03-10-2003 07:34 AM

what else do you have with your setup?

kahren 03-10-2003 11:41 AM

75hp isenouf to push u around BUT its far away from stock twins

atlest in my opinion, i am more concerned with moving from a stop

without revving too high instead of ultimate power. and most singles

cant do that.

SPOautos 03-10-2003 04:59 PM

I made about 90-100 @ 3000 with the BNR's running seq and WAY to rich. My low rpm/ low boost was around 11 a/f and should have been about 12.5 a/f. I imagine with a little more tuning it would be about 100rwhp or so at 3000.



STEPHEN

kahren 03-10-2003 05:23 PM

i woudl be interested in seeing the upgraded twins running seq and the switchover point dyno anyone?

SPOautos 03-10-2003 06:31 PM


Originally Posted by SPOautos' date='Mar 10 2003, 10:59 PM
I made about 90-100 @ 3000 with the BNR's running seq and WAY to rich. My low rpm/ low boost was around 11 a/f and should have been about 12.5 a/f. I imagine with a little more tuning it would be about 100rwhp or so at 3000.



STEPHEN

Whoops, that was supposed to say NON seq!!!! I just noticed that I put seq on accedent...guess my fingers were too fast for my brain haha



Anyway, it wouldnt let me edit the post for some reason



STEPHEN

foko 03-27-2003 10:47 PM

i use an RX6 on a streetport. conservatively tuned it's about 320rwhp @10psi and 375@ 15psi. i use my car only for track (road racing/track events). no drags, no street. while overall i'd say the unit performs well and delivers plenty of power with little lag...... my two complaints are:



1. small turbine/turbine inlet/outlet.....i'm not a turbo wizard so i'm not sure about this....., but my exhaust manifold temps are consistently over 1800 degrees F despite perfect AFR's. i attribute this to the small turbine size/poor flow characteristics. i don't like those kinda temps.....may not bode well for turbo bearing longevity.



2. i recently blew out an exhaust manifold to turbine inlet gasket. two weeks later i'm still looking for one. even apexi is telling me they don't think they can get me one in less than several months! that kind of support is reason alone to NOT have this turbo as far as i'm concerned.



just some thoughts.

good luck

fabian

vspecpgt 03-28-2003 12:17 PM

apex can do it but it will take a long fricken time, apexkw on the board had to order a new oil fitting for the turbo and it took like 3-4 months. a real pain in the ass

93FDGT3540 04-22-2003 09:15 PM

I put down 160 rear wheel hp at 3k rpms with my GT3540. almost 350rwhp by 4.5k rpms. Show me a T-78 doing that. On a NON-Ported Stock Reman.

rfreeman27 04-30-2003 10:25 AM


Originally Posted by 93FDGT3540' date='Apr 22 2003, 06:15 PM
I put down 160 rear wheel hp at 3k rpms with my GT3540. almost 350rwhp by 4.5k rpms. Show me a T-78 doing that. On a NON-Ported Stock Reman.

You got a sheet for that? Stock Ports? If so Kudos for you man, but it does seem a little high. I have a non-ported reman so if you made this much power its good news for me! Got a sheet?

93FDGT3540 04-30-2003 06:39 PM

1 Attachment(s)
Hell yeah I got a sheet! And I was on my way to making more power but my boost controller was set to cut boost at 15.5 psi and I didnt realize it until i got home from the dyno. This is why my power drops off at 6k and starts to wave. This sheet also was while tuning. Its not a great representation of a tuned car but it does show what a 90% tuned car is putting down for #'s with this turbo. Kinda high? Kinda low I think. I made power power with my old motor when it was tuned. Both stock motors. Both with same Turbo. I may be wrong about power at 3k. Looks more like 170+. Either way it kicks everything ass down low. I think this is the perfect turbo for the rotary.

93FDGT3540 04-30-2003 06:43 PM

1 Attachment(s)
Hell yeah I got a sheet! And I was on my way to making more power but my boost controller was set to cut boost at 15.5 psi and I didnt realize it until i got home from the dyno. This is why my power drops off at 6k and starts to wave. This sheet also was while tuning. Its not a great representation of a tuned car but it does show what a 90% tuned car is putting down for #'s with this turbo. Kinda high? Kinda low I think. I made power power with my old motor when it was tuned. Both stock motors. Both with same Turbo. I may be wrong about power at 3k. Looks more like 170+. Either way it kicks everything ass down low. I think this is the perfect turbo for the rotary.

kahren 05-01-2003 04:48 PM

u have about 95 hp accordign to the dyno sheet what u are lookign at is tq numbers

kahren 05-01-2003 04:51 PM

the bigger turbo u choose the less the numbers will be down low, you are gettign pretty good power at 3k even with 95 hp, for a single u might want to look at your fuel curve, u might be runnign alittle too lean down low...just a suggestion, and check your timign if u have a standalone

93FDGT3540 05-04-2003 06:24 PM


Originally Posted by kahren' date='May 1 2003, 01:51 PM
the bigger turbo u choose the less the numbers will be down low, you are gettign pretty good power at 3k even with 95 hp, for a single u might want to look at your fuel curve, u might be runnign alittle too lean down low...just a suggestion, and check your timign if u have a standalone

DOH! LOL. Dave at KD Rotary tuned it. Also the graph is all over the place as we changed out the wastegate spring after a few pulls. I thought those lower lines were from the earlier passes with the lower wastegate spings. I didnt think the Torque was shown on the graph. I thought all those were HP #'s but I could be wrong.

rx7machine 05-20-2003 10:44 AM


Originally Posted by kahren' date='Mar 10 2003, 12:30 AM
uhh, from what i have seen, dyno charts, the gt35/40 has about 75 hp at 3k rpms, and the rx has about 100 hp at 3k rpms, that is a BIG diffrence, stock is about 110 hp, t78 is about 75 hp at 3k rpm as well. and the t04e is about 100 hp as well (non ball bearing) as u can see the rx6 and the t04e are about the same producing about the same hp up top at 13 psi about 360 at wheels.



i really dont see how the gt3540 is a fast spooling turbo other then when it starts to spool it spools faster then somethign say a t78, the gt3540 gives u a better spool and more power sooner, but the t78 has a better tq curve.



now u decide what u want https://www.nopistons.com/forums/pub...DIR#>/wink.png

If stock produces about 110hp at 3K rpms.. then why go with the GT35/40? ..if it only produces about 75hp at 3K rpms.. https://www.nopistons.com/forums/pub...1047683561.gif

94touring 05-20-2003 06:14 PM

Those numbers are all relative to the porting and tuning done. Stock turbo's may make 110hp at 3k rpms but will only be good for about 380rwhp at 15psi, while the gt35/40 will be good for around 425rwhp at 15psi. PEOPLE WORRY WAY TOO MUCH ABOUT LAG!!!

93FDGT3540 05-20-2003 06:54 PM

All i gotta say is ride in a car with stock twins and then get a ride in mine. I've had both and my GT3540 walks all over stock twins. Plus the heat created to make that kinda power from stock twins is an Engine KILLER. I see a huge drop in coolant and intake temps when i switched over to the single turbo. The stock twins are great for stock boost levels. But while your tracking down all your boost problems with your stock twins every other week I will be enjoing as much boost as I want. There is no comparison. Only for the guy who doesnt want to spend the money and wants to try and justify not spending the money. No one who has gone single would ever go back. That speaks volumes.

Badog 05-20-2003 07:08 PM


Originally Posted by 93FDGT3540' date='May 1 2003, 05:43 AM
Hell yeah I got a sheet! And I was on my way to making more power but my boost controller was set to cut boost at 15.5 psi and I didnt realize it until i got home from the dyno. This is why my power drops off at 6k and starts to wave. This sheet also was while tuning. Its not a great representation of a tuned car but it does show what a 90% tuned car is putting down for #'s with this turbo. Kinda high? Kinda low I think. I made power power with my old motor when it was tuned. Both stock motors. Both with same Turbo. I may be wrong about power at 3k. Looks more like 170+. Either way it kicks everything ass down low. I think this is the perfect turbo for the rotary.

Wait until we get it tuned in, Mike!

rx7machine 05-22-2003 10:23 AM

Yea, the whole lag thing is killing me.. I basically want the least amount of lag as possible, just as good as the twims.. but with the power and psi capabilities of a single.. I know.. it's probably impossible.. https://www.nopistons.com/forums/pub...1047683358.gif

94touring 05-22-2003 01:34 PM


Originally Posted by rx7machine' date='May 22 2003, 07:23 AM
Yea, the whole lag thing is killing me.. I basically want the least amount of lag as possible, just as good as the twims.. but with the power and psi capabilities of a single.. I know.. it's probably impossible.. https://www.nopistons.com/forums/pub...1047683358.gif

If you go with the gt35/40 or even a t62 (.70 compressor & 1.0 hot side) like me, you will be asking yourself "what turbo lag?".


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