Dyno Result For Midly Modified R33 Gts-t

[Stel]

Hey guys,

Got my car dynoed over the weekend.

Pulled 247.4HP.

Mods include:

3" Turbo back exhaust

FMIC

HKS Pod

12 PSI boost from bleed valve

Im pretty happy with the result....can anybody else with similar mods comment on their dyno result?

Just wanting to compare with others.

Thanks

Stel

[gtrken]

Think I would rather a little less HP and a lot safer a/f ratios.

12.5 or so after it has come on full boost is a little lean.

Wind down your boost until you sort out if the problem is injector flow or fuel pump.

BTW , why can't workshops turn the bottom scale from kmh to rpm .

It's not hard and is a lot more useful for comparisons regarding spool up , lag etc.

Cheers

Ken

[Stel]

We'll i have an SAFC going in tomorrow so should be fine after a tune with that.

I wanted to see what i get before and after SAFC.

[R31Nismoid]

Check the RB25 dyno sticky thread

But yeah, pretty spot on. Long as it drives good, thats all you need.

You need an SAF-C/PowerFC though as you have the typical "dip" in the mid-range, and then another nasty one further up.

Also i'd drop 1-2psi outta it for safety if you arent looking to upgrade turbo anytime soon.

Give it some solid curry @ 12psi and ceramic wheels have flown a few times before

[gtrken]

We'll i have an SAFC going in tomorrow so should be fine after a tune with that.

I wanted to see what i get before and after SAFC.

<{POST_SNAPBACK}>

Not necessarily , they normally run rich all things being correct.

I think you still may have a problem with your fuel pump.

Cheers

ken

[JeeTeeEss25Tee]

Assuming you have a stock ecu it's wierd how it did not go rich at all. Guess you dont even need a SAFC to lean it out

[R31Nismoid]

Thats cause (as ken said) the fuel pump is probably on its last legs

I never seen a stocker ECU run that lean all things in working order

[Busky2k]

With the SAFC I doubt you'll gain any more power at all, since the AFRs are already knife edge. You'll probably loose some as the AFRs are richened up a lil for safety.

[2rismo]

Get your fuel pump checked/changed. Now.

Adrian

[Stel]

Thanks for the advice guys.

The guys at Castle hill said that the afr's arn't too bad (between 11-13) but i don't know how interested they where in helping out.

Im gonna install the SAFC, tune it on the dyno, if we see there is a problem there with fuel pump or anything similar ill get it change.

Lets see how we go i guess.

Im not driving the car much now anyway....and i granny shift when i drive anyway so it should be ok.

Thanks again for the help.

Stel

[FATGTS-R]

Yeah as mentioned having 13:1 a/f ratios at peak torque aint too good. And considering the ambient temp in the workshop was 38C well that makes it even more scary.

[The Dan]

The AFR's are ok. The little stab at the end is where he snaped off the throttle. 12.5 AFR's are good. My only concern with the dyno sheet is that 1. You shouldn't be making that much hp from those mods and 2. It was only an average of 28 degrees in castle hill on that day so what's with the 38 degree air temps. 40 degree inlet temps would see you making much less hp than that with those mods.

Personally I think someone has beefed up the results.

[R31Nismoid]

I dont think its a case of "see" if there is something wrong with the fuel pump.

consensus is that there is something wrong, ort something about to go seriously wrong.

Its far to lean for a stock ECU

But its your car, and the experts here have given thier advice.

Take it or leave it really

[chrissso]

Yahe, I had 12.5 ratios on the stock ecu after same mods. It was the fuel pump. PSI was dropping to about 40, instead of 51. Tuner said just under 12.5 is about right, but change the fuel pump and get it retuned as the fuel pump will get worse.

Safc won't give you any more power, but will help the fuel trim issues that you get with r33 at cruising speeds. I dont know if r34's have this problem, but I ganied about 130 KM a tank at cruising speeds after tuning.

[benm]

Say hello to a PowerFC, Fuel Pump and Exhaust Cam Gear

[NickR33]

I run just slightly richer ratios than that and I have a SAFC installed and we have had to take out A HEAP of fuel to get the powercurve to smooth out... unless your ecu has been chipped you have something wrong somewhere!

Also That dip in your top end looks like your ecu is pulling the timing back (for whatever reason maybe related to your fuel pump which has been mentioned ^^)... dip in the middle is normal for stock ecu but it could be better

[The Dan]

R31Nismoid is right and there is something wrong with your fuel pump. The AFR's are ok though....for now. They could be a tiny tiny bit better but AFR's of 12.3 ish are fine. With those kinds of mods and running that boost you should have AFR's closer to 11 though....so yeah, unless you have a partially blocked fuel filter....change your fuel pump

Edited January 26, 2006 by 3lit3 32

[cerci]

Say hello to a PowerFC, Fuel Pump and Exhaust Cam Gear

<{POST_SNAPBACK}>

hell yeah!!

check out my dyno results in the n.s.w section

big difference wit those 3 major things

[benl1981]

Standard ECU should be giving you about 9 or 10:1 AFR at those mod and boost levels.

Check your fuel rail pressure under load. Most likely as they say a fuel pump issue.

Replace fuel filter yourself before you get this investigated.

Any tuner (respectable) will tell you these cars run rich when the wick on the turbo is turned up or mods added. In fact sometimes mods = less performance as more airflow = less timing, rich AFR.

My stock ECU went down to 10:1 AFR at 8psi boost. Power FC went into 9:1 AFR under load at 10psi.

Your fuel pump might deteriorate more so don't let it go too long before fixing it up.

DONT use a SAFC to richen it up. It should be there to lean it out on these cars.

As a side note - I got 172rwkw at 10psi on a conservative dyno (so within about 10kw of your figure). 10psi maybe safer for you.

Edited January 26, 2006 by benl1981

[Stel]

Hey guys,

Got the car tuned last night at Unigroup engineering.

I have just installed an SAFC and the powergains where very noticable.

Last dyno (first post) pulled out 187kw with pretty shocking afrs.

with the safc i managed to get 206.6kw with an AFR of about 12 flat.

I asked if it could have been a problem with the fuel pump last time and they assured me that if it was the fuel pump, the afrs would be going up with the revs.

The first power curve was just after safc was installed and car was running funny.

cant explain it any other way, only did it once, then sorted itself out.....