Pete L

My son is attending Pierce Community College outside of LA taking automotive technology and invited me to do a dyno pull on a dynojet with my 86 (they do this every Saturday). The car is stock, original cats, stock exhaust an no chips. Have done a ton of work this year on the car, such as rod bearings, curing all vacuum leaks, etc. Passes CA emissions

Two runs, staring at just north of 3000 RPM, one in 3rd other in 4th.

Max HP run 1 in 3rd = 267 HP and 264 Ft/lbs
Max HP run in 4th = 270 HP and 266 Ft/lbs

Ive attached the runs and AF readings

Not to bad for a 170,000 mile car. By the way had just tracked it at Willow on Wednesday, perhaps this loosened her up a bit!

IcemanG17

nice strong #'s.... drive on!!!!!!!!!!!!!!!!!!!!!!!

I also think 928's run better after track days...when I used to take my street 928 to the track...it just seemed to run smoother and better after the track!!

Mike Frye

Yup, that's a nice strong runner. Auto or 5-speed?

I think the stock hp rating in the manual is 288 for the '85-early '86 cars and slightly higher for the '86.5 because of the true dual exhaust. Presumably that would be at the crank so it would dyno lower at the wheels.

Now it's time to put some crossovers and a chip/FPR combo on there and REALLY wake it up!

danglerb

Any chance of some kind of 928 event some Saturday?

Numbers look solid. I don't think miles make much of a difference in HP, not until something happens to rings or valves, and thats more event than miles.

Iwanna928

I love seeing dyno results! Strong 928 you have there. Nice job!

AO

That jives with Shane's 86.5 car in stock form. 271RWHP 266RWTQ. https://rennlist.com/forums/5347706-post1.html


Very nice numbers!

PorKen

S3s are stump pullers. Better to start the dyno run at just over 2000 rpm. Peak torque is at 2700, so many times the peak is missing.

The AFRs are a touch leaner at high rpm than usual for stock, but that's probably because of the cats. I would check that the WOT switch is engaging all the time, anyway. Hard to say for sure, but it may be flaky, or the accelerator cable loose.

The last versions of the stock S3 LH base fuel maps are slightly richer too, which might make a little more torque.

oups59

This looks quit good.

I wonder what my 1988 will produce : x-pipe, no cats, gt resonator + GTS muffler and with a performance chip.

I really need to dyno my car

Norton928

PorKen,

Have you ever thought of making chips for the S4? I would have to think the AutoThority chips currently available could be improved upon, using 93 octane fuel, etc.

Norton

mark kibort

nice runs. yep, i would get a RRFR, or do a chip mod to fatten things up. also, we dont know the accuracy of your tail pipe measurements. Ive seen errors there before, vs the plug in the cat method.

Markmandude

How much power do you think those items add?

svp928

Porken's 85 car is at 314 rwhp with those mods plus colder plugs and his newest chips....

Mike Frye

I'm going to the dyno tomorrow morning so I'll tell you what I'm putting down with the stock air filter setup and also with my custom setup.

Last year I dyno-ed 291 at the wheels with just the crossovers and Autothority chips and stock FPR. I'm hoping to come up north of 300 tomorrow because I've still got the stock cat-back 2-into-1-into-2 exhaust. I think Ken has his muffler 'modified' to flow a little better.

I also advanced the cam timing a few degrees to bring the peak torque down in the powerband a bit, which will probably cost me a bit at the top end.