rgs944

Rather than clog up someone else's thread I want to know what people think a factory correct S4 has nowdays. Let's say it has 125K and has just had intake refresh, tune up, and everything else reasonable to bring it back up to spec and drivable condition. No mods yet. Do you think under 300 or over 300?

Rob Edwards

Under 300.

rgs944

Thanks but I guess I should have added how much over/under do you think?

Lizard928

250-265 rwhp.

Rob Edwards

When they were brand new, 316-320 hp, minus 15% for driveline loss, so roughly 270 rwhp. Minus whatever has 'aged' in the ensuing 20+ years.

Speedtoys

Properly maintained..

Lizard928

Yup, properly maintained is correct.

Also this is unmodded, no X pipe etc.

Speedtoys

Hater.

Speedtoys

I yanked 289rwhp from a 88S4, fresh after a top-end refresh, Xpipe, 89+ resonators, RMB on a Dynojet and mild early sharktuning.

danglerb

dr bob

Whether the dynojet numbers are 'accurate' or not, the raw numbers are pretty darn consistent. Since folks want to see a lot for their modification and dyno dollar, the correction factors can seem optimistic to this former ex has been performance test engineer. The raw numbers may not make you happy, but at least you can get usable differential numbers.

Speedtoys

At least its a well maintained kit, with little correction to actually perform.


He's one of the few places you can get spec class sealing done..his ****'s done right.

All three of his Dynojet units on site read within 1% of each other any given day.

He's not a hobbiest.

Even does high altitude dynojet work for motorcycles in a barometric chamber.

SeanR

Most of them are going to be 255-275 at the high end. Mine, after lots of going through and mods only did 289hp and 301tq. This was before the GTS intake and spacers but I doubt very much it added more than one or two.

Hilton

Sounds about right.

Some results from aussie Dyno Dynamics machines in "shootout mode" (i.e. standardised ramp rate etc. to enable comparison with results from other dyno dynamics machines):

'88 S4 auto - bone stock - 250rwhp
'89 S4 auto - bone stock - 257rwhp
'89 S4 auto - bone stock - 261rwhp
'89 S4 manual - bone stock - 260rwhp *
'89 S4 manual - xpipe only - 280rwhp *

* - same car

pcar928fan

My S4 has always been pretty well maintained and only has a RMB and some of the later AutoThority chips (the early ones were worse than stock chips!) and it put down 263/267...