damon_Z

I have a 2002 Z28 with the A4 and around 54,500 miles. The actual baseline dyno is in my sig and was performed at TT Performance in December 2004 using their dyno jet. The following is a summary of the dyno runs that were performed on 11/11/06 at Harris Speed Works using their dyno jet. All 9 runs were made within an hour. All 9 runs were made on the same dyno. The weather condition is on the linked dyno graphs. This was an open hood dyno with a fan blowing air towards the radiator area from an angle beneath the car.

With Thunder Racing's Ported Throttle Body:

Run #1: 295.2 Max HP, 346.4 ft-lbs, 12.9 a/f
Run #2: 296.8 Max HP, 341.9 ft-lbs, 12.9 a/f
Run #3: 297.7 Max HP, 345.9 ft-lbs, 13.1 a/f

With Thunder Racing's Ported Throttle Body & The SLP Lid:

Run #4: 300.6 Max HP, 352.7 ft-lbs, 14.0 a/f
Run #5: 300.8 Max HP, 352.2 ft-lbs, 14.0 a/f
Run #6: 303.3 Max HP, 353.0 ft-lbs, 14.0 a/f

With Thunder Racing's Ported Throttle Body, The SLP Lid & Al Austin's SSRA2:

Run #7: 317.8 Max HP, 358.5 ft-lbs, 14.1 a/f
Run #8: 316.8 Max HP, 356.5 ft-lbs, 14.0 a/f
Run #9: 315.9 Max HP, 360.4 ft-lbs, 14.0 a/f

I can't wait to take this car to the dragstrip. I think I can get at least a 110 MPH trap speed in really good weather.

BrandonDrecksage

iTrader: (1)

not to burst your bubble or anything, but comparing numbers from two different dynos doesn't really do you any good. Each and every dyno is different. A magazine once tested around 10 dynos with the same car in similar weather and there was a 70 hp difference between the lowest and highest numbers.

damon_Z

You didn't burst my bubble. You should have read the whole thing. The baseline used in this dyno session was the first three runs. All 9 runs were made on the same dyno. Just to keep your same mistake from happening again, I've made it clear in the original post by bolding and underlining it.

BrandonDrecksage

iTrader: (1)

I did read that, I was just pointing out that dynos are different and just because you dyno that, doesn't mean you'll trap 110. Also, 14.1 a/f ratio is kinda high...isn't it?

damon_Z

Yeah, I understand you now. It looks like the SLP lid leaned me out, but the mandatory dyno tune is in store for the near future. I just have to upgrade the whole exhaust system first...

BrandonDrecksage

iTrader: (1)

hmm...maybe i should have my car dynoed, thats lil scary that it would do that. was there any detonation?

'Trust'

iTrader: (24)

Yea, 14:1 is pretty lean, thats how the MAF gets you the power, once you richen it up you'll lose some. Great numbers regardless though. You may not trap 110 though, ALMOST trapped 112 and I'm making 400 RWHP. However, it was my first time out, but I doubt my MPH will be affected much, just take her out and see, if your not satisfied add some more stuff!! Good luck.

damon_Z

Thanks. I'm hoping the weather gets extra extra cold just to give me the additional horsepower. I'll keep you posted on any quarter mile time results...

damon_Z

I don't know. The only monitoring that was performed was air/fuel. I just realized that if I was to compare the air/fuel ratio, from the baseline dyno that was done on another dyno jet two years ago, to the baseline dyno with the ported tb (above), then I can assume that the ported TB also leaned me out, because the air/fuel from two years ago was at 12:1. I don't think that air/fuel ratios should vary much between dyno jets.

damon_Z

back to the top...

92SilverSHO

iTrader: (3)

the tq seems pretty high for what you have.

damon_Z

Yup. I just realized that. The baseline torque numbers are around 30 ft-lbs more than my baseline number from another dyno jet. I'm trying to get to the bottom of this...

Brian2006

iTrader: (42)

Happy with my SSRA as well. They advertise a gain of 13rwhp at a simulated 50mph and obviously your car likes the SSRA Did you have a very high powerful fan under it?

damon_Z

Not even. It looked like a big fan that you would buy for your living room. It's the SSRA2 that I have. It's not the full system that includes the long under-bumper scoop.

MeentSS02

iTrader: (11)

Get that A/F ratio down...I've run my car that lean before at WOT (during one of my latest tuning episodes), and it ran like ****.

BrandonDrecksage

iTrader: (1)

dyno being caliberated differently/ different type dyno

damon_Z

back to the top...

GOaT Cheese

You stated that the the 9 runs were with hood up. Was the run in your sig with the hood up? I'm sure you are aware that the "hood up" is a trick dyno opperators use to boost h.p. output. The hood being down will kill 15-20 RWHP.

damon_Z

Yup. I don't think I've ever seen a dyno performed with the hood down.

GOaT Cheese

Ya, chassis dyno numbers are a pet peeve of mine, as I'm sure some of the respondents on this forum will attest.