Cliff Ruckstuhl

I just made a deposit on a 87 S 4 and will be bringing it home in a few weeks. After having a 951 ther were allot of performance up grades to be made. What are some if any that can be made to the 928 S 4?

Cliff

danglerb

What do you want to do that it doesn't?

Cliff Ruckstuhl

I would like a better sound it has the stock exhaust and would be nice if it had a throaty sound.

Cliff

RyanPerrella

get new speakers, amp and sub, and an RMB either stainless or black.

Try 928intl for the RMB and your local bestbuy, circuit city, audio store for all the audio stuff. Sounds like you just need more entertainment for your ears.

Jim R.

Cliff,

Best performance "upgrade" will be to get it running to factory spec first. Small vacuum leaks, bad knock sensors, bad/old plug and coil wires, clogged injectors, old MAF, etc. will all take just a little power away.

Exhaust: rear muffler bypass (RMB) has a great sound and pretty cheap too. A crossover with high flow cats and a RMB is what I have-a bit loud at WOT, but I like it.

Performance upgrades are supercharging (pick CS or TS), Turbo (no kits out, and the one in developement did not fit an automatic), suspension, wheels/tires, brakes..........

Good luck with the new car. I spent a bit of time getting mine right before doing much more than a RMB. Since then, bilstein/eibach coilovers, Murf stage 2 CS supercharger, custom 18" wheel and tire package, Motorsport (Utah) exhaust crossover with cats and kevlar clutch kit, stereo upgrades, powdercoated cam covers/intake and probably some I already forgot about as well as some future motor plans.

Jim

Cliff Ruckstuhl

I think the first thing I will do is the RMB and then just do a over all check on the car. Becuase of the holidays I am going to bring it home in a few weeks. Then I will know more on what I have. Car is a 9 out of 10 77K on the clock red with black interior. All stock, a few things do not work and I expected this. Passenger heated seat does not work, out side mirrors do not work and the ABS light for the brakes is on. PO said he had the brakes checked out and it is a sensor??? I amthinking the electric stuff is more then likly the switches or a heating element. Any thoughts? Is ther a link to a site that might have some trouble shooting ?

Cliff

morganabowen

As far as I'm concerned the best bang for the buck is the performance chips. Then add the cross over with an RMB and you got yourself a badd *** car And these small upgrades cast less than a grand

Cliff Ruckstuhl

So who sells the best chips and what is the gain?

Cliff

ZEUS+

Very wise suggestion.
Best performance "upgrade" will be to get it running to factory spec first. Small vacuum leaks, bad knock sensors, bad/old plug and coil wires, clogged injectors, old MAF, etc. will all take just a little power away.

chaadster

I don't know if they are the best, but they are the most widely known and have a history: Autothority (www.autothority.com).

They claim gains on the S4 of about 20hp, iirc, but as stated above, the base state of tune of your car will be a factor here, too. 928 Specialists has dyno sheets from some independent testing they did, and you can check those out at www.928gt.com.

I happily run the Autothority chips.

morganabowen

I agree that the most important factor is to get your car running up to specs. Once it is all ok, then you add the upgrades. I have a set of Autothority chips that I can be convinced to part with for $150. They came out of my '91 S-4. I took them out and replaced them with the Super Chip from Germany. My opinion is that the Super Chip gives more performance. Good luck

Ispeed

My performance recommendations:
1. Restore everything to 100% function from intake gaskets to knock sensors, wot switch etc.
17. 5 speed tranny vs. auto. The 5 gives you a feeling of fast any time you need it, my .02
38. Lomas x pipe
39. Drive, rinse, repeat!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!