Ritter v4.0

I did a search and not much either way.
Most cars seem to benefit from good, performance headers; why not ours?

Does anyone have and can opine?

Jack Esposito

Porsche did a pretty good job with the stock headers in order to get all the horsepower they could from the 3.6 aircooled engine. Heard of people trying different exhaust systems and actually loosing horsepower.

Jack

Ritter v4.0

Spend money and time = loss of hp/tq = not a good deal

Still hoping to get some more ponies without spending $20k for 9m 3.8 conversion (at which point I would just buy a TT).

I'm trying to do what I swore I would not do- mod the 993 like I did my S4 (chip/remap, downpipes, intake, exhaust, no cats, bigger turbos, suspension etc.). Someone stop me- PLEASE.

Steve Weiner-Rennsport Systems

Mister Jack speaks volumes of wisdom on this subject.

Unless the engine is highly modified with different cams and intake system, there are no real-world gains with headers over the OEM heat exchangers.

My best advice for those looking for additional performance is to install a properly-chosen set of close-ratio gears. NOTHING makes as big a difference in your 0-60 & 0-100 times,....

Ritter v4.0

Steve- Do you change all 6?

Can you give some real world numbers for 0-60 and 100?

Wreck Me Otter

If you want go fast in a normally aspirated 993, buy my car....ask Steve about it...

Bill Verburg

I agree w/ the above, for headers to get you anything they need cams, for the cams to work they need intake. You have to do it all at once.

Same for gears, you could do 2 or 3, but to get the most benefit all 6, here are some possibilities

David 23

Bill, interesting chart. I see you have the cup gears? Your thoughts? Are you tracking the car?
Steve, can you make any comments on expense?

Steve Weiner-Rennsport Systems

Ritter:

Normally (for street cars), we change 2nd, 3rd, 4th, 5th & 6th. 5th gets moved to 6th as that works really well and saves buying a gearset. I cannot comment on specific 0-60 & 0-100 times since thats all about technique and how much one is willing to abuse the car's clutch and transmission.


David:

Its very difficult to quote the costs due to the variables:

1) Transmission condition (parts needed for overhaul)

2) Number of ratios to be changed

3) Need for different mainshaft to facilitate changing 2nd gear. '96-'98 cars need a '95 mainshaft that has the removable 2nd gear.

4) Labor rates vary widely; we are $ 75/hr and have no sales taxes,...

5) Possibility of needing LSD overhaul


LOL,...Someone ought to buy Kim's car since that thing is REALLY trick and the powertrain is VERY low time. Its a "weapon" in the right hands.

autobonrun

3rd, 4th, and 5th gears were changed on mine; then the old 5th gear became my 6th.

But one question, I heard that certain year 993's have 1st and maybe even 2nd gear fixed on the shaft so that it is not replaceable. Is this correct and if so what years have 1st and/or 2nd fixed?

Bill Verburg

They all have integral 1st and second is separate thru '95 and on the G50/3X, '96 up have 1 and 2 integral w/ the mainshaft. There is probably some overlap, there often is.

You can see how well you like a 5 as 6 by just eschewing to use 6, I did that last summer, it is quite liveable. I do like the somewhat higher top end of the /30


/20 has a top ~180 way too high, good for fuel economy
/21 or /31 have a top ~170 good, better for street than track
/30 has a top ~160 very good, better for track than street
/20 w/ 5 as 6 has a top ~150 a little low but still useable especially for shorter tracks

autobonrun

Thanks Bill, I think my 96 had both the 1st and 2nd integral.

You're right about 6th gear. I find myself staying in 5th gear for most cruising speeds. I seldom use my new 6th gear (which was my old 5th gear ratio). After one of your previous posts I checked and found that I have the stock 1st and 2nd gear.

My 3rd gear is 1.600 with 2032 teeth.
4th gear is 1.308 with 2634 teeth.
5th gear is 1.083 with 2436 teeth

JasonAndreas

You're unlikely to see any improvement 0-60, maybe a 1/10th of a second at most? There was some discussion about it HERE.

Martin S.

My neighbor has a Jeff Gameroth tranny, re-geared. He drives the car mostly on the street...some limited track. He says the biggest difference is that the car is more fun to drive abround town. He always seems to be in the right gear, says he....

I secretly lust after a close ration tranny with a Guard or PMS LSD....but not enough to pony up the cash....my guess is it would be at least 20 hours of labor...at $100, $2,000 + $2,500 for the LSD and another $2,500 for the gears...that's $7,000, ouch!

I know that Steve built "Wreck Me Otter"'s car, from top to bottom. This is about the best sorted out 993 one could buy. Why it is still on the market is a mystery to me. I'd buy it but I'm just a po boy .

Bill Verburg

What you get w/ a regear is flexibility, at less than max revs you have more choices for what gear to use and one of them will be closer to what you need, here is a comparison of the thrust aavailable w/ the different transmissions, blue is /30 red is /20