HBdirtbag

Do you guys ever run single turbos?

BG

Why?

HBdirtbag

[quote]Originally posted by BG:
<strong>Why?</strong><hr></blockquote>

more power, move away from two small ones to one very large turbo. Alot of supra and skyline people do it once they've pretty much maxed out the power they can get on twins.

Shank996TT

Yes more power, and also more lag. We're still at the 996TT HP Engineering infancy to see how much HP it can handle. Single turbos in the supras didn't get developed/poplular until its post US production days. ALso, it isn't that expensive to experiment with the Surpa blocks/heads. But boy, its stock rods and pistons are incredibly strong.

One day, tuners will offer Single Turbo conversions for the 996 but perhaps with a built motor package.

HBdirtbag

[quote]Originally posted by Shank996TT:
<strong>Yes more power, and also more lag. We're still at the 996TT HP Engineering infancy to see how much HP it can handle. Single turbos in the supras didn't get developed/poplular until its post US production days. ALso, it isn't that expensive to experiment with the Surpa blocks/heads. But boy, its stock rods and pistons are incredibly strong.

One day, tuners will offer Single Turbo conversions for the 996 but perhaps with a built motor package.</strong><hr></blockquote>


any 993 guys do it?

JohnM

Ruf's aftermarket turbo option for the 993 (the "BTR") was (is? still available I guess) a single turbo.

HBdirtbag

[quote]Originally posted by JohnM:
<strong>Ruf's aftermarket turbo option for the 993 (the "BTR") was (is? still available I guess) a single turbo.</strong><hr></blockquote>

no ****, how did it compare to the twin's they did?

Konstantin

the twins are faster, have a better spool up and if it is not enough you can always get bigger Turbos. The only downside is the price.

Konstantin

Rick in Portland

Soontobe,

None of the 993 GT2 racing teams used a single turbo. GT2 turbos are larger (K24's) and will develop (with obvious other mods) the maximum hp that engine can produce reliably.

Single turbos exhibit lousy lag times, especially for the street...... no thanks.

Rick

PorschePhD

Typically single turbos do create huge lag time, but then again it is like anything else...How you build it. When my 79 was in its last 3.3 form it created full a 1.0 at 2600-2800RPM. The car was only making 475 HP and it wasn't easy to get it to spool like that. The street usage was unreal. It would click 11.8s @ 129MPH all day long with a step side on the clutch at 3250RPM. My 993TT doesn't create boost with the K24s any better than that. In fact it takes longer to spool. My TT is not stock either. The TT was far easier to make HP in and makes more, but lag time is not any better and nor are my 1/4 times. Of course my TT is 3300Lbs nicer than the 79

Rick in Portland

Yep, and I bet you are running the stock CATS. If you are running K24's, and they are GT2 turbos, they will have some lag unless you are running CAT bypass pipes. It also really depends how your ECU has been modified as well.

Rick

PorschePhD

Rick,
I have the bases covered...cat bypasses, mufflers, Forge BOVs, S cooler, L/W F/W, GTII clutch,FPR and modified the ECU to stage III, etc, etc. Did it myself in the shop so I know the ECU is spot on. I could change cams and lower the times, however my point was it is possible and it is more difficult to create HP and lower times with a single than a dual. Then again the car to car cost is much more as well. When I built a 3.6 twin for the 79 and threw everything at it, full boost was created at 22-2400 and made 607HP @ 1 bar.

PorschePhD

CJV,
I did...Replaced the shaft and the syncros. The syncros I did do the steels as well. I also managed to twist the input shaft again in less than two weeks after I fixed it. It simply does not like any aggresive behavior. We are now doing on with GTII parts. If this doesn't do it I give up!

PorschePhD

CJV,
What to avoid...Well I really don't know if the 996TT tranny is any stronger the 993TT version, but it is aggressive launches. Maybe Steve W. can help us with that one. IMHO not that aggressive will cause it. Under 3K launch is not what I call aggressive, yet it is enough to cause the tranny to tweak the input shaft. The energy has to go somewhere and with AWD it gets caught in the tranny. I imagine with the added HP I am running that didn't help either. The tranny is being fitted with GTII input shaft and gears as well as syncros, billet forks and Guard LSD plates. Steve is doing this one for me. I know it's not a drag car, but still 3K or under is not that aggressive. Heck, my wife could slip the clutch on a hill and WHAM...new tranny time. I imagine more of these cars are running around making noise than we think. It is frustrating to have pulled the motor more than I have done oil changes. One more time and hopefully this will be it. <img src="graemlins/c.gif" border="0" alt="[ouch]" /> <img src="graemlins/burnout.gif" border="0" alt="[burnout]" />

Konstantin

@ stephen
Do you stil have the monster car with the brand new GT2 Turbos that you got from me? If so how much HP did you got out of it?

I was wondering because I see that you use a 993TT now???

Konstantin