Dyno run

[Diverwes]

Well ran car at dyno. Now what does it all mean?

[AFJuvat]

You are pushing 288HP and 308 Ftlbs of torque.

You are running about 30 HP shy of where you should be, the engine is rated for 315HP stock from the factory.

You do seem to be running a little rich.

AFJuvat

[Diverwes]

But that 315 stock is at the flywheel not the wheels.
Im 287 at the wheels. From others im running about 350 HP at the flywheel. They say about 20% loss to the wheels.

[Speedster94]

i think it is more 10-12 % on a rearwheel Car . For the 4 WD cars the usual count is 15 % .
So i think you are in the green pushing about 320 HP .
harald

[Cobalt]

Have you done any mods to the car? The general argument is between 15-18% loss for the G50/52 tranny. I think it is closer to 18% myself. So you are between 340 and 350 fwhp depending on which loss factor you use. I am assuming you are running headers possibly without cat? Stock spring?

[Diverwes]

Im running stock exhaust with cat bypass with high flow TurboS and Tial wastgate with .8 spring.

[Cobalt]

Originally posted by Diverwes
Im running stock exhaust with cat bypass with high flow TurboS and Tial wastgate with .8 spring.

To begin with I guess a better question would have been what type of dyno is this chart from and what were the atmospheric conditions? The dynapack chassis dynos seem to be the best to test the 964T's on. The mustang dynos usually read low.

I know someone with a 92 964T running B&B headers and muffler therefore no cat, HF K27 and a 1.0 bar spring in the stock WG he was seeing 315 rwhp. So your 287 is showing you an increase of 15.4 hp over stock which is not tremendous for the cost of the mods. However, The HF turbo is giving you more useable power up high were it is needed in these cars. The stock K27 turbo dies out at about 5000 rpm and to really use the power in these cars the HF gives you the added air in the higher rpm range.

If you are looking for more power I would recommend the headers for reduction of turbo lag by 300-500 rpms, a new (preferably billet type BOV and to get the max out of the turbo a .9 or 1.0 bar spring. Most importantly having the car tuned on the dyno to verify max AFR is achieved. This should bring you to the 300-315rwhp number.

Good Luck

[Diverwes]

It was a Dyno Jet Dyno and they had a big fan in front of the car not the back. The IC was hotttt. I just bought GHL SS headers so with my Tial wastgate at .8 bar and my HF S turbo I will see what it is doing.

[Diverwes]

Ok after I get everything back together I will have to take it back and rerun her.

[Cobalt]

Looks great when it is all new like that.

BTW I thought you were running the Catbypass? Or were you talking about the small cat off the WG? The primary cat is still in place. What is the canister on the right hand side? I see you removed the muffler. Is this a GHL muffler as I am not familiar with their systems. But if you are still running the cat you can eliminate the muffler altogether. Or you can eliminate the cat and use the stock muffler. The muffler will show no noticeable difference in performance with or without it.

In either case the car looks really clean and well maintained. Keep us posted.

[Diverwes]

The Cat is in so i can pass emish then im taking it off and putting in bypass pipe. It is a GHL system.

[Diverwes]

Sorry the canister is the oil line from the tank to the block. They send a new hose to rerun in its place

[indigowhale]

Is there a special way to dyno a C4? I mean, do you just leave the front wheels on the ground? No harm to the F/R differential?

[tjn]

indigowhale, damn thats a mouthfull! you will need an all wheel drive dyno with two sets of rollers. won't work on a 2 wheel drive unit. i've also been told that if the front wheel drive is disconnected so that a 2 wheel drive unit can be used that the readings are inaccurate. tjn/vk