doktor-t

Hello everyone!

Iīm planning to take my car to the dragstrip this summer and wounder what ETīs thatīs reasonable to expect?

The car is a 928S -86 with a 32v 5,0 liter engine and 4 speed auto. The rear gears is 2,54 (swedish gear ratio) without any LSD. So far i run stock wheels and the only modification is deleted sparetire and cruisecontrol. Iīve also deleted the cat and replaced it with an 2,5" X-pipe like the one OTT makes and an 2,5" RMB.

Well, what do you guys think?


Best regards/
Tobias, Sweden

dprantl

For a 5-speed of that model 13.9 - 14.5 seconds. The auto would be similar, maybe slightly slower around 14.5s.

Dan.

doktor-t

Well, that ainīt to bad.

For starters I will remove some more unneccesary things like the stereo, smogpump and insulation if I find some behind the interior panelling.

I almost forgot to tell that Iīve already deleted the rear wiper and electric hatch mecanism.

As for traction Iīm searching for some S4 8" rear wheels and if I find any I will purchase Bridgestone R-tires for them. I think that would be a good upgrade If I wanīt to autocross.

I also thought about the rear suspension, what about setting the rear springs as soft/low as possible? Their currant position is at itīs hardest/highest position.


/Tobias

Vilhuer

Is yours US or ROW model 32V? If ROW it has 4 hp less. In reality it doesn't make a difference. Many more important variables than that like tires for example.

Jim bailey - 928 International

Raising / lowering the spring perch has nothing to do with the spring rate , just how high low the cars sits. The higher the car (both front and rear) the higher the center of gravity the more weight transfers to the rear wheel under acceleration.

Brett928S2

Hi

With that rear diff ratio, and depending on traction you will be in the high 14s if you are lucky and have done it before, if not low 15s

You wont be in the 13s without major tuning...etc

All the best Brett

IcemanG17

I would say 14's.......low 14's with the X pipe and a hard launch...but it easily could be high 14's

David L. Lutz

+1 "easily high 14's

RyanPerrella

high 14's to low 15's

The auto is the real fun killer!

Whatever the 5 speed does, add 1.0 - 1.5 seconds for an auto

Tony

I beg to differ on the "fun killer"

if youve never ran the drags before id say high 14's..low 15s. You will never see 13's

RyanPerrella

at least we agree on drag times

atb

I don't think so Ryan, not with your typical 928 owner. The A/T's will be consistently faster just because they hook up better and shift faster. There will be the occassional run where the 5 speed owner will hit the perfect launch, and nail each shift, but in my experience, that is a very rare circumstance. Even then, it's about a .5 second spread.
Then again, it could just be that the 5 speed owners up here in the PacNW don't know how to get the job done.

A 32vS A/T's with the 2.20 final drive were pulling 14.5's to 14.7's up here. It'll be interesting to see what difference the shorter gearset will make, if any.

doktor-t

My guesstimation is in this timeregion too. Hopefully, with some of the modifications Iīve already done and shedding off some weight I hope to break into high 13īs to low 14īs.

Mainly I want to get below 14,234 because that is what I pulled with my Pontiac Trans AM GTA -88 with 350" TPI and auto. Some mods were done and probably it had about 300 horses.

It would be nice to atleast beat that car, possible?

Mike Frye

With that MY, you should get a set of chips. The car really likes them and around 3800 things get really interesting.

For the manual vs. stick thing, I'm a major fan of the 5-speed, but in a drag race (for which these cars aren't particularly well suited) the 1-2 shift can be a bit tough. I like down shifting to let it out for turns, but that's from 4th to 3rd or sometimes second. You don't need first for that. The part of the dogleg that you have to use from 1-2 can sometimes be inconvenient in the 5-speed.

Look up the 2-3-2 technique for launching if you haven't already.

Brett928S2

Hi

Sorry but no, you wont beat a 14.2...no way....not without some serious engine work or Nitrous lol

You "might" get a 14.7 (I doubt it) but that 0.5 down to 14.2 is an eternity in a drag race...

All the best Brett