94RXse7en

I am looking into dumping the stock twins and going single - I want to run pump gas so I will not be running more than 15-16 psi. The car will be a street driven car so building boost fast is very important. I know the RX6 will spool quicker than most turbos available however I have also seen that it tops out at between 360-400rwhp @ 15psi. Maybe a little more, but probably not on my stock ported motor. All the other mods will be there. 400rwhp +/- 15hp with fast spooling is my goal - but of course the highest hp the better - Let me know your thoughts - thanks!

pp13bnos

iTrader: (1)

When I was searching for my setup, I was looking at those same exact turbos. What it came down to was the Rx-6 was way to expensive. The GT35/40 was unrebuildable (At the time....and I still don't know if it is..???) The T04S did'nt have the topend "punch" the 35/40 did. So after it was all said and done, I was going to go with the to4s setup, because it was the cheapest, rebuildable, and made some decent numbers overall. But if you would wrather have a fast spool, I'd go with a t04e.

I ended up going a completely different direction in the end. I Should have just bought a kit, and been done with it. Instead I peiced mine together.

Hope this helps, CJ

suganuma

if it was me....

T04S w/ 1.00a/r P trim hotside

Broken09

iTrader: (1)

I went gt35/40.... it is rebuildable now. Sean from A-spec posted in another thread what the cost was although I don't recall what it is. I'll look. I have the 35/40 and love it. Running 1 bar on the road and it's very nice

Broken09

iTrader: (1)

here it is....
https://www.rx7club.com/showthread.p...hreadid=251740

racer1

GT 35/40 is the best one of your options.

RX6 is too expensive but is the fastest spooling of the 3, TO4S will not give you these numbers on a stock ported engine. GT35/40 will spool fast and give you these numbers maybe more.

pp13bnos

iTrader: (1)

Check this link out. http://www.catenet.net/dyno.php

This is a great place to see what different setups will do under different conditions. The only thing that could make this sight better is if they could organize it to be able to adjust the listings of the cars. I'm guessing by like having a pull down menu, that you would choose factors like the type of turbo, psi, etc. That would make it alot neater. Anyways...have fun. CJ

1badd7

Hey CJ! Are you done with your to4s yet? What numbers did you get? I'm Johns brother with the to4s and the guy you got the free race fuel from. Going back to ralph in March and hoping for around 500rwhp.
Later, James

pp13bnos

iTrader: (1)

Hey James! Yeah, I know who you are. Infact, If I see that you or your brother posted something, I usually read it.

I'm still waiting on the fuel system. I ended up going with a larger turbo than the t04s, due to me getting a deal on one. But once the fuel system is finished, I'm going to head to Ralphs too.

I was talking to Ralpht the other day, and he said you had some more fuel problems...what did it end up being? Later, CJ

Jason

iTrader: (5)

I can say that the best value for your money is the T04S, no ifs, ands or buts.
T04S kit is the most complete kit out of the three and will give you the most HP per dollar.
GT35/40 is a great kit but after you spend $400 extra on a BOV and fabing piping to your intercooler it ends up in the high $3k range.
I wont even talk about the Apexi, its not worth wasting my breath on at over $4k.

One advantage of the GT35/40 is it will spool alittle quicker than the T04S. HP numbers are very similar between the two and we have actually seen more out of the T04S.

In the end they are both nice setups. Alot depends on what you are looking for.

Jason

1badd7

I put two fuel pumps in my car and at 18psi the fuel was droppong off. We got 424rwhp. So, my brother and I are installing a fuel sump and a aeromotive a1000 pump. Should be done this weekend We have to get together sometime soon!!! I like to see your car.
Later, James

My tuner said the to4s is best at 20psi and above. Even at 10psi the car is awesome!!!

mark57

... it isn't easily serviceable as the others.

$150FC

pp13bnos: thanks much for that link, waay more dynosheets than i thought were in one place

Garrett

There is really no question. A TO4S has almost identical spool rate of a GT35/40. I don't understand why people glorify this turbo when if you look at dyno sheets on both turbos the TO4S has the same power down low and ends up making more power up top. The output does no drop off with the TO4s it gains because of a 1.0 A/R on the exhaust side. With this high A/R on the exhaust you get a better turbo for ported motors and for higher boost. Rebuilding them is dirt cheap and they are both water and oil cooled. The intake side is even polished. These myths are ridiculous about the TO4S.

Garrett

RacerXtreme7

iTrader: (2)

QUOTE from Garrett: "There is really no question. A TO4S has almost identical spool rate of a GT35/40. I don't understand why people glorify this turbo when if you look at dyno sheets on both turbos the TO4S has the same power down low and ends up making more power up top. The output does no drop off with the TO4s it gains because of a 1.0 A/R on the exhaust side. With this high A/R on the exhaust you get a better turbo for ported motors and for higher boost. Rebuilding them is dirt cheap and they are both water and oil cooled. The intake side is even polished. These myths are ridiculous about the TO4S.

Garrett"

AMEN!!

Although the GT35/40 is a great piece of modern turbo technology you have to look at application. Its suited better for higher pressure ratios and slower volume. in other wards a engine injesting less air but at higher presure ratios (verses the rotary, it likes huge volumes of air at low ratios {I consider 15 psi or 1 bar low}]. It is a great turbo, but the T04s is just spot on for a ported 13b thats street driven, and you can't beat the price or ease and cost for rebuilding.

~Mike...............

RacerXtreme7

iTrader: (2)

double post

RacerXtreme7

iTrader: (2)

hmmm 35/40 uses a GT 40 compressor correct? Maps look awsome on it (nice and broad), I guess it boils down to how big your pocket is. the 35/40 should perform better theoredically, guess its a matter of people who currently run it having less then optimal set ups, were are the big 400 + numbers around 1 bar at?

~Mike...........

books

iTrader: (8)

At the previously mention site http://www.catenet.net/dyno.php :

for the 35/40

dyno graph 53, possibly car SilverTT posted approx 425 hp at 15 psi
dyno graph 54, had around 400 hp with stock ports

Zero R

iTrader: (1)

It does not use the GT40 comp wheel, it uses it's own wheel of a different size.

As far as big 400+ numbers around one bar, it was never said to produce big 400hp numbers at 1bar. Your hearing the wrong people on here talking about what they heard other wrong people say. The car should put down around 400whp around 15-16psi on stock ports.

-Sean