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/)

93FDGT3540 04-30-2003 06:43 PM

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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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