ed devinney

Here's a data point for anyone considering modifications. PCA Potomac region and Curry's did a charity event of dyno runs for charity. I have an 88 turbo S, with an Authothority MAF and chips along with a test pipe. Bottom end is fresh with about 1200 miles on it.

I pulled 244hp, which is satisfying, the mods have overcome the driveline losses. I didn't win most hp, but tied for 2nd with a 993, 1st was a 911 turbo at 275 hp. I did win "closest to factory horsepower" :-). Not sure anyone made over factory, so I'm thinking I might also have had the highest gain over stock.

What I curious to know is whether there's anything still on the table to be gotten. Specifically, could tuning with an a/f meter get any appreciable gain?

ian

What type of dyno were you on?

And yes tuning a/f can most often yield more hp....

adrial

do you know what kind of dyno it was??

You should see way more than 244 RWHP with those mods.

nyda

Now I'm no expert on this, but with the mods you have I was expecting more HP than that. What was the torque?

ed devinney

I should have mentioned that the dyno is a Mustang. I've read Steve Weiner and others here indicating that the Mustang can give results 15-20hp lower than a dynojet. The fact that the stock 993 ran 245 to the wheels (down 15% or so from flywheel) tells me that the numbers are reasonable.

Torque was 252 @ 4250. The printout indicates 236hp @ 6000, but the 244 # was the one given to me. Don't know why.

adrial

Ed, the 236 is probably the direct measurement and the 244 is the SAE corrected number.

Was the air pressure especially low the day of the dyno? Or a hot day? (anything over 70 degrees = hot I believe)

Did you get an a/f curve printout?

Scan and post your dyno results

streckfu's

That sounds about right. I have the same mods on a non-S and am getting 243 at the wheels.

adrial

streckfu's951, is that on a dynojet or mustang dyno?

On a dynojet a 951S with MAF should be making at least 260, 270 to the wheels at 16psi

ed devinney

Air pressure was probably low (it was stormy here) but temp was good and cool. So 260-270 on a Dynojet is about 245-255 on a Mustang from what I've read. If those numbers look right for a non-S, shouldn't I be seeing a little more top end from the larger turbo? All hoses, etc are new, guage shows stong boost at top end.

Here's the chart:
<img src="http://homepage.mac.com/ejd/.Pictures/951dynobig.jpg" alt=" - " />

tazman

I would of thought you would make more power with a MAF also. Here is a dyno chart of my car with Autothority chips AVC-R and shimmed waste gate. Everything else was stock to the best of my knowledge.

<img src="http://www.marsmann.com/tazman/Firstrun10-11-02.JPG" alt=" - " />

ed devinney

Any other insights?

Ahmet

I don't know, I'm running guru chips (and the manual boost controller set at 15.5 psi +3 bar fuel pressure regulator, with good compression), and I can't pull from an e36 m3 until mid 3rd gear. I think we're used to over-rating these cars a tiny bit, even though I would expect to have seen a tad bit more power from your car.
Ahmet

Ski

On average, the Mustang dyno reads 13% less than a DynoJet. I pretty much have all the stuff for the "363hp" package, except the cam and I don't run the car at 18psi. My last Mustang dyno run was @17psi, was 282hp, 290 torq.
If you add 13% to that it comes up to 318, then plus 20hp for the cam, 20 hp for 18 psi,,= 358. Not quite 363 but close.

David S recently put his car on a Mustang dyno and the figures were exactly 13% less than what he pulled on a DynoJet about 3 months earlier.

Anyway, ed,,you should see about 275 on a dynojet.

Duke

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Ski:
<strong>On average, the Mustang dyno reads 13% less than a DynoJet. I pretty much have all the stuff for the "363hp" package, except the cam and I don't run the car at 18psi. My last Mustang dyno run was @17psi, was 282hp, 290 torq.
If you add 13% to that it comes up to 318, then plus 20hp for the cam, 20 hp for 18 psi,,= 358. Not quite 363 but close.
</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Maybe the cam will give about 20 hp but I doubt that 1 psi of added boost will give you 20hp. That's only about 0,068 bar. But on the other hand your turbo is quite large! Hmm..

ed devinney

Thanks all, so it's sounding like the numbers are as expected - looks like about a 35-40hp gain from stock. I'm not too worried about absolute numbers as long as I get reliable power down to the ground and can pass the 993s at the track.

I do think I'll see about getting some good tuning with an a/f guage in there to try to optimize things. Thanks all.