NoPistons -Mazda Rx7 & Rx8 Rotary Forum

NoPistons -Mazda Rx7 & Rx8 Rotary Forum (https://www.nopistons.com/)

- Single Turbo Discussion (https://www.nopistons.com/single-turbo-discussion-13/)

- - 35/40 Limitations (https://www.nopistons.com/single-turbo-discussion-13/35-40-limitations-34410/)

Check out these 2.

carx7 VS silver93tt

I don't know Chris' porting specs off the top of my head, but I DO know he put a lot of thought into his turbo and manifold design. Look at his low RPM advantage. Looks like about 25 hp all the way up to nearly 4000RPM.

hey dave, wanna take a ride in my t-78....tuned and put in by dee https://www.nopistons.com/forums/pub...#>/biggrin.png just holla. i also wanted the gt35/40 but he convinced me to go with the greddy. just holla. stock port though.

Quote:

Originally Posted by Fd3BOOST' date='Feb 24 2004, 02:53 PM

So you want me to do what now?

What about Michel? Did he ever get is Gt-40?

Oh and thanks for the tip on the turbo name. 35R its is from now on.

https://www.nopistons.com/forums/pub...#>/biggrin.png Put it in neutral and stomp on the gas! https://www.nopistons.com/forums/pub...#>/biggrin.png See what your boost peaks at. It's no definitive test, but it can give you an idea.

I thought I saw Michel mention he got a non-ballbearing GT40 in the end. https://www.nopistons.com/forums/pub...1047683561.gif

Quote:

Originally Posted by 1fastsvn' date='Feb 24 2004, 12:00 PM

Most defintely, This Kevin?

I had a similar conversation and he told me he felt confident that he could bringa t78 to full spool under 4000 rpm.

My thinking was if that is true he could get a 35r spooled up super fast.

Either way I would love a ride, but only on a straight away. I aint stupid https://www.nopistons.com/forums/pub...IR#>/smile.png

Quote:

Originally Posted by Fd3BOOST' date='Feb 24 2004, 11:29 AM

I agree that there is now way I can keep from getting whooped up till say 3800-4000. But after that I need one serious good kick in the pants. Hopefully the 35/40 would come to full spool at say 3800-4000 with the right manifold/and my ports. My twins come on line at about 3900(non-seq). I have Demetrious to bug about tunning. https://www.nopistons.com/forums/pub...IR#>/smile.png

I imagine he could get me where I want to be as long as this turbo is willing.

Thanks for the link to Brians page.

I still would like to know where does the 35/40 fall off and where is it's effincey range?

Thanks for chimming in. https://www.nopistons.com/forums/pub...IR#>/blush.png

The RP T78 turbo kit is actually done in my car and with a high flow cat. that explains the laggy spool up time. I believed that the dyno chart was taken off from one of the magazine to show that a high flow cat can generate 400rwhp+

If you only want around 400 get a T04s like Brianhas or a T04e. Its way cheaper then a 35r and will make decent power. It wont cost a **** ton to rebuild. If you want something cool then get the 35r but its gonna cost more in the long run, and only make a little more power.

I have the gt35r or 35/40 whichever you want to call it. Personally for street driving I love it. I had my large street ported motor tuned to 1 bar earlier in the fall and I have full boost at about 3500 rpm or so. I plan to tune to approximately 17 on pump gas this spring with new wheels/tires, as this was what would not allow me to safely tune past 1 bar. I was told that this turbo really doesn't become efficient until approximately 17 psi. I suppose if your port were aggresive enough it could spool the T-78 a bit earlier than normal but for my money if the 35r weren't enough I would probably go with the 40r as it should produce about the same amount of power as the T-78 give or take some but spool quicker as it is BB. Honestly call Sean at A-Spec and talk to him about the setups you are considering he'll be able to help set you straight.

-Nic

I am the only one that can't see those dyno comparisons https://www.nopistons.com/forums/pub...O_DIR#>/11.gif ...

Quote:

Originally Posted by TYSON' date='Feb 24 2004, 09:48 AM

Dave,

Play around with Wargasm's dyno page some. There's only 3 35/40 dynos on there.

Here's one showing:

- Dick Lamberts stock turbos (probably perfectly maintained and tuned) don't know if it's ported or not.

- Ihor's 35/40 @ 15 psi and 20 psi. Heavily street-ported engine, we've all seen video of it running, I think.

- Toy's 35/40 @ 16 psi. don't know if it's ported.

- RP T78 car. don't know if it's ported either.

Up to about 3800 RPM the stock twins are putting out more power. Stock and 35/40 clearly spank this T78.

However, with a bigger turbo I've seen power to match the 35/40 with almost no porting, (ie. sounds exactly like stock).

Serious porting can make a BIG turbo spool quickly, but you also need a well designed manifold to help.

GT35R VS stock twins VS T78

Hey, and keep in mind you're racing a 2.6L motor DESIGNED for high RPM against 5L and up motors designed for low RPM. You can't make the motor do what it's not designed to do no matter what you strap to it, unless you want to use nitrous. https://www.nopistons.com/forums/pub...#>/BURNOUT.gif

Take those dyno graphs on that site with a grain of salt. Who knows how those cars were tuned or tuned at all. That is probably the worst looking T-78 graph I have seen. If you want to see a good one look here http://www.rx-7store.net/rx7pics/zaviersdynograph.jpg

If you superimpose that over the others the T-78 is making more power throught the entire power band.

finally some answers to the 3540 confusion! 450+ at 17-18psi sounds very nice. what kind of boost can it go up to and at what point would it be a good idea to use 98 octane?

i'd like a ride in a t78 sometime!

fd3boost when you do get one and get tuned by demetrios tell me how it goes because im looking to get one when i have money and im tired of nonseq.