Jean

From what I have heard, it is the rod bolts. The crank is very strong. Unless you detonate or you have high mileage, I don't think your pistons and rings are at real risk. Head studs and fasteners are not the best either.

hatchy

at least we dont have to worry about water pump failures

TB993tt

Without sufficient intercooling namely a $15K Secan unit (according to all the 993GT2 EVO race teams which ran north of 600hp/1.2bar boost at peak power) your power will be limited to around 550hp @ around 1.1bar, going north of this boost level will show you more boost on your boost guage but will not translate into more power without the intercooling, instead the result will be oval bores fairly quickly depending on how often you run at WOT for extended periods. Without head sealing rings, going over 1.1 bar will result in flames and other matter exiting from where the heads seal against the "blocks" - to be fair even with sealing/flame rings, there is still leakage over 1.2ish bar. Over around 800NM/590lb/ft at peak torque you will bend stock rods. For those on fixed boost I would guess 600hp(715NM/525lb/ft) @ 6000rpm. The race engines had a rigorous maintenance program based on hours and they ran around 1.2 bars at peak power to include checking for oval bores and big ends, new head sealing rings, head rebuilds, piston rings etc. A good reason to stay south of 1.1 bar (peak power)

Jean

TB, VB is using a TK I/C and K24/26 like turbos, enough CFMs to flow up top, he could see some nice horses until heat soaks.

TB993tt

Fair comment - I look forward to you giving us some real intake numbers to see just how good the I/C is - having said that yours will be different from VBs I presume since you have the pressure sensing induction and AFAIK VB is using stock 993tt ?

Jean

Actually thinking of diverting the engine to Germany before flying it over here and maybe having a session at RS? Depends on the $$$ involved.

hatchy

So it sounds like a lot of things break around the same power range (550hp?). Without getting into the whole turbo discussion, are stock K16s/K24s pretty much out of their efficiency range at above 1 bar? How much air do they flow at 1bar?

stockboost

You won't see details in my signature about our car, or will I elaborate more than this about our past setups. Our car is a competitive street class car, so that is why I will not share everything that I know about this.

As far as running more boost than 14.7 lbs of boost(1atmosphere) We ran 17 pounds of boost in a daily driven(40 miles a day) 993. Stricly boltons, stock motor, cams, and intake. We upgraded turbo's one more time to make 620 whp with race gas(~18psi) and some good old fashion tuning, but after driving that for about a month everyday, it started to lift the heads. So before that became a problem, we evolved to our current setup. And we now have the fastest street driven 993 in the country.

Jean

Stockboost, just saw your car pics on another thread, very nice.. But PLEASE, and I don't mean to flame anyone, if you want to make such claims, you should be ready to prove them and not say it is a secret. We are one big happy family here and we share information to benefit each other. Could be that your dyno is out of calibration because the numbers you mentioned above just don't go together: Stock cams <=> 750fwhp and 1.2Bar <=> 750 fwhp with stock heads and I/C.
Any "public" pics or links you could share with us? Any videotaped acceleration numbers? Thanks

stockboost

Who said anything even CLOSE to 750 WHP? And also who said anything about a stock intercooler? Not to flame back, but cmon, at least read the posts.

TB993tt

I think Jean mentioned 750 Fwhp - which he was guestimating your 620whp to be.
Please tell us us some more, if you've found an intercooler that works better than stock, we need to know....please

Jean

I swear I read them! As TB mentioned I just extrapolated your 620 Rear wheel hp to 750 Flywheel hp assuming it is a 4WD, because your previous post said RWHP. Sorry about the I/C when you said stock this and stock that, I assumed it was stock too, not that it would make a difference.

Seriously though, please share some more about the fastest 993 in the US, Devek said they have it, Prototech also, and some others on another turbo board, I am really puzzled

Kevin

Well, there we go.. 17l-18bs of boost and he lifted his heads... Stockboost, there isn't much that you can do to a 993TT engine that hasn't been done before in the hardware department... You can sit on a camshaft grinder and sit at a bench porting and polishing your heads and turn around and say hush, hush... The quote " And we now have the fastest street driven 993 in the country." As Jean was kindly saying, puzzled? Old fashion tuning? So you have regeared your car with what ratio's? Please humor us all and snag a in car video of a 60-130 run so that we can time it... Please realize that some of us have spent more money in hardware than the purchase price of our cars... And some of us, play with these car for a living...

ScottMellor

The fastest 993. Uh-oh, Deja Vue.

George? Carlos? Is that you?

vrus

May I ask how you came to this conclusion? Did you bring your car to some event and have it compete against other 993TT?

Please elaborate...