I was just wondering how much power the GT40R guys out there are making? I have my kit on, but my car is not broken in yet. Also, I have the newer GT40R with the .72 A/R compressor housing and a 1.06 A/R turbine housing. I'm just kind of trying to see what kind of power I can expect. Thanks

Dee

PS. Mods are in my sig. The only thing else I will be getting is another fuel pump because I want over 500rwhp.

 

Anybody?

 

LOOK ON THE rx7 dyno site.. I made 427 with stock motor and Kzeller made 457 on a small port. Depends on what psi you plan on running and who is tunning it... I think 500 by 25psi is capable.

 

How much boost were you running to make 427? I am running a little bigger than a regular streetport and I plan on running around 19-20psi on a normal basis. Steve Kan will be tuning it.

Dee

 

Well steve tuned mine... sort of... we ran into boost issues and only tuned it to 13.5 psi... I later fixed the problem and put it back on the dyno with 110 gas and watched A/F close since I was in untuned area's... 19.5 psi and 427hp.. This was also using a .84 exhaust side.. SO I hope with a large street port and fine tuning to see 500 at 25-27psi.. If I do not sell this setup before my motor is ready than I will find out.. Otherwise 42r here I come... I( would guess you at the 450 area from the above info you left... But I also saw were Steve got more out of this tubo running his manifold?

 

Not sure what I am making. I'll have to test is when the weather warms up. I think 27psi is out of the range where you can make useful power. Maybe 25psi. Anyway I am ready to go there once I add some more fuel.

My goal has always been 500rwhp by <20psi on pump 94.

Through the cracked manifold, exhaust leaks, and change in wastegate I actually think I am there. Fuel use and accel. timings support it. Just have to get it on the dyno when ambient air is warmer. Even at 11afr and 7000rpm at 20psi I hit 90's in INJ duty cycle. I think I need some more fuel so I am planning on 1000's to go with the 1680's...the 860 top feeds just are not giving me enough safety margin.

So what are you going to do about traction? I roasted a set of drag radials last summer just from testing and tuning and that is WITH traction control. The only thing that could be worse is quicker spool up like the 35r and s. Don't know how those guys skate with full boost in the 3800's rpm. I am happy with full boost by 4200-4300 in 3rd gear.

Tony

 

Asleep: I already have 1000cc primaries and 1680 secondaries. The only thing I will need for over 500rwhp is another fuel pump. For traction, well I have 19x10s in the rear with 275/30 on them. They should do enough for now.

Dee

 

mr2foryou i think you are going to need a little more tire then that
my r-85 @ 14.7psi roasts the tires at 60mph roll and thats only like 420 or so at the wheels and im running 18s with 285/35 pirelli's

 

Uh, No they will not be enough for now.

Tony (Asleep) is running 18 x 10 315/35(?) 555r Extremes and his car is undrivable without the traction control. You do not have enough tire, or side wall, to handle 16 psi on a GT40R!

My Half Bridge T4 35R on 285/30/18s 50 compound Drag Radials is undriveable at over 14psi.

 

Dee,

Two fuel pumps versus one has been debated to death. I started with two and ended with one. What ever works for you and feel comfortable with, go for it. Just make sure you upgrade the supply and return to the right sizes for your application. Don't forget to cut down on the 180's and sharp 90's if you can. I think I would rather have a smooth 180 than one sharp 90.

Traction. These guys have already chimed in and they are right. You have no idea. Just hope you keep it under control when you find out!

Tony

 

Do you guys with traction problems have an aftermarket LSD and coilover suspension?

Also, when you're talking about "traction control", are you talking about variable boost control?

 

For traction I will be fine feathering on the throttle to keep it from spinning too much. I have driven my buddies 35R 3rd gen that makes 450rwhp on regular street tires and even spinning, I can keep it under control. Ray Wilson told me on the telephone that 500rwhp is all that my Supra fuel pump would flow. So, I don't know. If Steve can tell me that I don't need another one, then I will not get one. I just hope my turbo is not disappointing. I want over 500rwhp.

Dee

 

On my Proxes (stock suspention, stock sized tires, and stock wheels), 400rwhp in pretty much uncontrolable in 1st and 2nd. Even with the boost controler off, 1st gear is nothing but tire spin.

I don't know what size of tires Ralph Friend (Xcessive) is running, but I do recall him saying that his car had no traction until nearly 100+mph. Of course, he's running 600+rwhp. CJ

 

Asleep is running a stock LSD and TrueChoice Coilovers. Soon to be a S4 TII LSD as soon as he gets of his lazy *** and we install it.

I run a S4 TII LSD, Diff Brace, and Tokico Illuminas (I know they suck but they came on the car) with RB springs.

We're talking about Racelogic Traction Control! Although, we are toying with Variable boost control with the profeB specII switch as well.

 

Maybe on Supra. Watch your fuel pressure. One Supra pump might get you above 420 but then you'll see a drop in FP in high RPM. I went with a single pump since I really don't want to lose my engine when I lose a pump. I would rather the car just not work rather than lose it in mid-drive. I use the Bosch '044 pump have installed it in a least 3 other cars with no problems and issues. Your lines need to support 500rwhp. Good luck on the stock lines if that is what you're trying.

Man, you must have a delicate and sensitive foot! My size 12.5's cannot react quick enough to not lose speed in a pull. Again, things change in the heat of "encounter."

The difference between 450 and 500 on a car that weighs less than 300lbs is pretty impressive. Either HP level is impressive. That extra 50 is real useful up top against uncorked, cammed, sprayed 150 shot, and tuned Z06's putting down 700ft lbs of torque.

Tony

 

Asleep: I do not have new fuel lines from the tank to the front of the car, but I have new lines in the engine bay. What size lines would you suggest I get from the tank to the front? Thanks

Dee

 

AN-06 is about the size of the stock lines. I would suggest AN-08 to the engine bay and for the return. I assume you are using an after market Fuel Pressure Regulator?

 

Yes, I have RX7Store's Ultimate fuel kit. It has an Aeromotive FPR and liquid-filled gauge.

Dee

 

Nice numbers!
Just wondering what kind of 1/4 mile times you guys run??? 0-60mph time??

 

mine made 431 at 22psi no port work

 

gt40byu: That's what I'm talking about. Those are sweet numbers. Who tuned your car? You have any pics of the setup? Thanks

Dee

 

Same issues here - 17x9 265 t-1 proxies, Ad coil overs, t04s 16lbs, Kaaz 1.5 lsd, Jim Labreck diff bushings, M2 links, and the RX7store diff brace. Still get wheel spin, but the nice thing is the spin is controllable, vs. the uncontrollable wheel hop I got before adding all this stuff. 70mph and WOT in 3rd = rear end drifting into right hand lane, but you can correct.

I'm thinking the only hope is fender flares and 12" rears when you go over 400 rwhp....

Beast

PS - would like to investigate RaceLogic traction control, but then you lose the fun factor kicking out the rear.....

 

Good to hear the car running and being able to afford the gas!

Racelogic still has the fun factor. You can program it to how it soft or hard cuts and still give you some of that spin. Plus it comes with an adjustor **** to give you an "on the fly" ability to tune the spin.

I have 315's on 10" width tires and don't think 12" will help...not without adding weight. In essence you're taking that same weight and distributing it across more sticky rubber, making it easier to spin. Maybe thinner and sticker tires?

Tony

 

back to fuel....

I had in mind of usinge the surge line ( stock pipe) to add more flow. We are not emissions compliant and all here. I was gonna use the stock fuel line + fuel vapor line, T them at the pump...is this making sense or is it too early in the morning? I am shooting for the 500....to4r set up WI, 1680/1000....single pump....

George

 

signofinfinity: I'm not sure if that works or not, but hey if it does, let me know. I don't have WI though. I hope you and I both can see 500rwhp on a single pump and 1000/1680s.

Dee