A-Spec GT35R initial dyno
 

Put the car on the rollers for it's initial dyno. Unfortunately, we only managed one preliminary run (after some basic tuning) to 7K before the clutch started slipping and we (Ralph, actually- I didn't do a damn ting :) didn't get it fully tuned. You can clearly see the slipping around 5200 RPM as well as 6K.

Results are encouraging- 362 RWHP @12 PSI on a Mustang dyno with very rich AFRs. Engine is a stock ported Mazda reman with about 15K miles, which include approximately 2K road racing miles (on the old twins).

Ambient temp was 67 degrees, sea level, 68% max inj. duty.

Running 500/1600 injectors, big Bosch pump, -8 lines, 3.75" exhaust, M2 airbox, M2 medium SMIC, and PFC.

New clutch/results forthcoming.

Gene

nice power for low boost =] i was just spinning my tires today on the dyno.. *sigh* gonna hit a dynojet sat.

That's close to 400 on a DynoJet!

WOW!



-Ted

When do you see full boost? What type of clutch were you using? Nice#!!! I am waiting on a GT35r from A-spec right now...and these results make me smile.

355hp @12psi running rich for safety.

how does it have 200tq @ 3k rpm???

Hey you, go back to NP (JK);)

Very good question. I wonder if the stock ports help. If I could make that good of a low end with a single, I would ditch the seq twins...

was the clutch spinning above 6krpm? usually when either the clutch or the tires spin, it'll throw off the dyno #'s since it still thinks you're applying the same amount of torque (to the roller) but your rpm climbs faster. I think mustang dyno uses an ignition pickup for rpm trigger correct?

good low rpm torque #'s btw

only single with lowend like that is the apexi rx6!!!! it's been a while since i looked at FD dyno charts but that looks too good to be true lol

of course youll say its too good to be true.

Maybe Ralph can answer this question, but why is the HP@50 10.00? It should be 11.9 or it will throw the numbers off.
Good numbers though.

Jason

My last dyno made 200 tq at about 3500.... it was around 140 at 3000. I think we might be seeing the effects of the loading of the Mustang dyno... So maybe it is spooled up at that point already on that type of dyno... whereas on a Dynojet the NA-power of the car would have already pushed the RPM above 3000 before much boost was built up.

well dam that sounds great i cant wait to put my car on the dyno at school thats stockports thats ahsome whose kit do have?

Looks good so far, what kind of clutch are you going with?

Yes. I did not spin on a prior run to 6K RPMs where it actually made more torque and a slight bit more HP (per RPM). Ralphs setup uses a crank trigger for RPM to minimize error. Can also calculate losses due to wheel spin, bad clutches, and drivetrain effects.

Gene

Thanks, (glass) man.

I'm going with an RPS 6 -puck.


Gene

BTW- website will be up this weekend, but with a new URL. I'll let you guys know where to find it.

i find more things break in the driveline wiht a 6 puck. i went with the act extreme and ss disk. its holding well!

I may try a full face bronze disc with an extreme plate. I run it in my supra, and they are good for 15,000 of hard driving. The ACT plate (HD) with the disc I am talking about holds ~750ftlbs.

Is that clutch the Pineapple Racing 6 puck? Thats what I've been running since I lost the clutch with the help of Ralph too. :) I love the clutch btw. CJ

Damn...I can't wait to throw mine on the dyno now. My mods below. Looks good. As some have mentioned...hopefully there aren't real discrepancies with the results. I go low, so I was thinking about 350 at 15psi. I'm not good as guessing that.

You should do much better that that. I'd say 390 minimum. Mods are similar, but I did fail to mention that I've pulleys, no AC or PS, and 8.5 lb. flywheel.

Gene

No, its an RPS clutch. Very similar to a 6-puck ACT, but with a sprung center.

As far a driveline wear is concerned, this car is not a drag car- only used for road racing/HPDE events.

Gene

That's a good question. This value adjusts for wind and rolling resistance. It obviously varies depending on the car's arodynamics, tire width, compound, etc. I've been looking into this a bit and there seems to be no real consensus on which numbers to use for a particular car. It seems that 10 is perfect for S2000s since stock the numbers corroborate with factory specs (assuming x% driveline loss). Viper guys use 12 due to the car's crappy aero and steam roller tires.

So- I'm not sure. I'll try to ping Ralph for an answer.

Anyone else?

When I got my mustang dyno they give you a tech sheet on every car made for the past 15 years. It gives the weight and the HP@50. I asked the guys at mustang exactly what that was and they didnt go into it, but said to keep it at what the book says. He said it would change the numbers one way or another. When I get time I will test changing that number.

Jason