Dyno Results On Your GTS Project!

[cooke24]

Anyone recommend a place in lower mainland that I should get my car dynoed at?

[MKIV]

^ mustang dyno, not as precise

Ah thanks. mine was done on DynaPack which is measured at the hub, not the wheels.

[R32GTS-R]

I am only running stock boost in the car right now. 8-9 psi.

[clone]

regarding "R32GTS-R" dyno could you post the printout. I am interested in the curve , and Air fuel ratio

[R32GTS-R]

I can't post pics I can email you if interested. Also, didn't connect wideband for a/f.

[Skym]

Your right my top end is rich. A guy at work pointed that out too. I am thinking of cleaning my MAF.
any other ideas?

It's normal for engine to go rich at mid to high rpm with bigger lph fuelpump (stock is 135lph and you have a 255lph fuelpump). It happens because injectors are open more at mid to high rpm when on boost. ECU retune (Nistune) can fix it. 10's are ok, that's roughly where it was at factory. It's just robbing hp being that rich.

[MKIV]

On the topic of Fuel pumps, is the Walbro 255 going to be good enough for 500+hp or should I upgrade ?

[Skym]

From what I understand, fuelpump is matched to the injectors your running. Bigger injectors = bigger fuelpump. With injectors, roughly 1cc = 1hp. As far as I know, 255lph fuelpump works with 550cc-600cc injectors, so limited to roughly 550-600hp at engine.

With around 1000cc+ ID (Injector Dynamic) injectors, liftpump in tank, surge / collector tank, external (internal if using Sard collector tank) fuelpump x 2 with dual entry fuelrail (Sard or similar), Sard FPR, etc.

If pushing limit's of fuelpump, make sure you have good wiring to fuelpump, as don't want a voltage drop at higher rpm.

This is a device that allows you to adjust voltage to fuelpump (from cabin) and works like factory setup -

http://www.kennebell.net/accessories/boostapump/boostapump.htm

Running direct to battery can cause problems as puts more load on alternator when light's, aircon, etc are on, heats fuel (unless you have fuel cooler), etc. That's why factory run it the way they do, to avoid all of those problems and extra $$$ to solve them.

[clone]

Great thread I am learning alot. My next upgrade is nistue, I did electronics in school I may install the chip myself. I heard "pure" and "RS tuning" are good for that too.

[MKIV]

Thanks for clearing that up Skym.

Hoping my 800cc injectors will mate well with an upgraded Fuel pump.

[Skym]

I think it's limited by the 550-600cc injectors, FPR. Can bump fuelpressure up via FPR and can squeeze more fuel out of injectors. On one RB20DET they bumped pressure by roughly 10psi (stock 35.5psi to 45psi on RB20DET at idle) that when combined with ECU tune, 300lph Bosch fuelpump made stock 276cc RB20DET injectors capable of handling around 370-380hp (engine) at 100% duty.

Fuelpumps are hp, lph rated at certain voltage, so should be easy to match to injectors.

This website has graphs showing the voltage vs lph for fuelpumps (GTR, Walbro, etc) -

http://www.stealth316.com/2-fuelpumpguide.htm#j4

Deatchwerks sell a fuelpump with flow data -

http://www.deatschwerks.com/products/fuel-pumps/300-lph-high-flow-in-tank-fuel-pump

and rough hp figures for fuelpump, etc -

http://www.deatschwerks.com/fuel-pump-tech/

Also they sell the hardwire kit for direct to battery feed for voltage -

http://www.deatschwerks.com/fuel-pump-hardwire-kit

From what I understand, duel fuelpump setup is due to if one fuelpump fails or is weaker, the other is still providing enough fuel. With fuelpumps in the US they can reach 1000hp+ (Aeromotive, etc), so one fuelpump is probably enough and even if weaker, probably still provides enough fuel. On most dragsters I've seen they run 2x fuelpumps feeding a V8 engine (2x fuel rails?).

Also most fuelpumps are brush type and could fail early if run at peak all the time (another reason why factory run it the way they do). Fuelpump run the factory way should last 100,000km (when it's recommended to be replaced with new fuelpump). Factory make sure car last's the 100,000km or 3? year warrenty period. If for performance you worry about factory wiring not providing enough voltage, not so much about longevity of fuelpump. But with that device to adjust voltage to fuelpump, can have the best of both worlds.

Also I think your meant to get a fuelpump with at least 10%+ more hp than hp rating of injectors. I assume it's a safety margin incase fuelpump lph drops over time due to bad wiring, etc.

[cooke24]

I got my car dynoed today at racing greed..

1996 gts25t
Stock rb25det
Downpipe, decat, hks hipower catback
209rwhp @ 6449 rpm
191rwtq @ 5200rpm





Seems low or am I wrong? Supposedly tht Dyno reads lower than other mustang dynos

Just bought a hks evc3 that I'll install tomorrow and bring the boost up a bit

[Skym]

This is a exhaust from turbo back on a R33 RB25DET with cat installed -

http://www.youtube.com/watch?v=qoGctn5o2Kg

161.5rwkw x 1.341 = 216.5rwhp

Then with HDI FMIC -

http://www.youtube.com/watch?v=t6FJUmChzgQ

And they ran it again before FMIC with 156.8rwkw x 1.341 = 210rwhp.

[MKIV]

What is the maximum PSI for the stock RB25 turbo, any one know?

[cooke24]

12psi. From wat I know