Haso928

Hello everyone,

Would you please let me know what do you think of this Dyno chart? are these healthy numbers? do you see any red flags? the car is 928 S4 with manual transmission. Thank you for your input .

SwayBar

Green looks like a normal run for an S4.

Speedtoys

IMHO, ~20-25Hp low for a 'all systems healthy' S4 5spd.

Speedtoys

260 on a 5spd?

A healthy auto will do 275-280 on a good day.

Kevin in Atlanta

I recognize that Dyno chart. Are you the car's new owner?

Haso928

Thank you guys @Speedtoys , @SwayBar , I am looking to purchase my first 928 and I got this chart from the owner, the car was used on the track. Going to see the car in person this weekend. super excited.

Speedtoys

While we debate what it should make..being a little low could just be it's time for a top-end refresh, nothing serious...dont let it stop you if the price/condition/maintenance vectors match up.

Haso928

@Kevin in Atlanta Hi Kevin, I am not the owner, I am looking to buy the car,
Are you familiar with this 928? please let me know if you have any information about it. The car is in Atlanta, 1988 S4 in Maroon color.
thank you

Kevin in Atlanta

I was interested in it, too. As familiar with it as you are. :-)

Looks like an interesting project. Somebody mentioned to me it was on craigslist last year.

Will need a complete interior.

Hope it works out for you.

Haso928

thanks @Kevin in Atlanta , yes , it needs a lot !!.

slownrusty

Dynos are dangerous pieces of equipment...period AND the dyno/shop environment punishes the car with inadequate cooling.

Many of us get wrapped up in major disappointment when we we think our car should read a certain number and after a few runs it is a fraction of that number.

I've been on the dyno 5 or 6 times and I ONLY use them to get two things:
1) A base or reference number
2) The delta from the modification to truly understand the benefit of the "mod"
that's it...

For a 33 year old S4 I would measure engine health by leakdown and compression and how it sounds drives and performs. A simple tune up with new plugs, plug wires, fluids, distributor caps w\ rotors and filter could easily add 10 or more rear wheel hp.

atb

I agree. Torque curve looks normal too.

The overall low numbers could be from the Mustang dyno. You can see the dynojet "conversion" of 270+hp which could be about right for a manual s4 on a dynojet..

Speedtoys

Ya, I see that, tires cost a lot of energy, also in how each operate/measure/etc/

Petza914

Keep in mind a dyno run in an open garage in GA in July when it's probably 90 degrees with a similar humidity number is not going to be very flattering for the car. Curves look good without major starvation or timing issues so I'd say that's what you can gather from that report rather than the absolute numbers.

SwayBar

The 'SAE Correction Factor' takes environmental conditions into consideration and standardizes the run to a 77 degree day, certain humidity, etc. so should not be an issue.