TB993tt

Viggo - try again

Not quite sure exactly what Jon is asking above (not sure he is either ? ) does he mean strictly stock apart from the 3 mod areas he is listing or what ?

LAT

FWIW; Ruf uses standard carrera cams in the Turbo R and they average around 500 HP

LA964RS

I'd say w/o the right ecu, and knowing how pretty stuff is when Kevin is finished, the turbos are...well...really cool paper weights...

Kevin

Yes, you are correct that there is ONE part number but KKK had multiple casting/machined housings used for the 993TT over the years.

I know for a fact that Sportec has a turbocharger builder on staff. I also know that this individual builds for other tuners.

A point that I was going to make earlier, it is the CNC'd tolerances that a machinist keeps. There are some CHEAP A$$ hybrids being built and sold machined with a hand rasp on a manual lathe. Ultimate Motorwerks has the tightest tolerances between compressor wheel and compressor housings (that is until foreign object enter the turbocharger). Painstaking machining to perfect the placement of a compressor wheel running in excess of 180K RPM with .002" clearance between the blades and housing. Hence my zero clearance process. I have had to CNC billet backplates, and thrust stacks to keep the turbocharger in one piece.

It is the tolerance between the compressor wheel and housing that "varies" between each tuners product. You can't order a K24 with the "x" compressor wheel and compressor wheel. It doesn't show up in a box. Someone has to machine the wheel into the housing. The clearance machined in the housing has a direct relation to compressor stage efficiency. Boost being built (more efficient)and entering the IC at lower temps will place less of a load on the intercooler.

V

Hehe. Not sure what he means either. It will largely depend on which turbos he is running I guess..

Just a general question: How much more labour hours is required to fit new cams and turbos as opposed to just fitting new turbos, retaining the stock cams?

I would guess that setting the cam timing not only requires significantly more labour hours, but also great Porsche tuning experiance. Whereas just fitting new turbos and retaining cams is sort of a "bolt on" upgrade which is pretty stragiht forward and doesn't really require that much tuning experiance.

Am I right?

Oh and sorry for the OT

LA964RS

vhanzon you may want to go to a thread re: CAMs here on 993TT board. It covers some of this. General rule of thumb....just figure every time you put a non-oe piece on the engine you'll be paying a bunch of $$ to somebody....

JBL930

Mine was just a basic question on what the stock engine can handle, so we are looking at roughly 500bhp with stock cams and 520bhp with sport cams but using K24/26 turbos.
I'm curious how my car is getting around 500bhp with K16/24's at little under 1.1bar, I know chassis dyno's aren't acurate but is it even possible to get 500bhp with K16/24's at that boost level? I know the Ruf Turbo R uses K16/24's and puts out around the same figures but at what boost level?

Edit: And are the Ruf K16/24's zero clearance?

TB993tt

Jon
Ruf turbo R boosts at about 1.1bar at peak power, I have seen one register 540hp on a dynojet in the UK !
It is all in the measurement... when we get your car at Brunters and measure the acceleration to 180mph the true hp can be calculated

JBL930

Looking forward to it Toby, any idea when we'll all get up there again?

Jean

Jon,

According to what I have seen so far, you will get around 470-480bhp with stock cams maximum provided everything else in the kit is well matched.. The R Turbo does not have stock cams, the Carrera cams are very close to the RS 3.8 cams. There are numerous off the shelf cams that will serve just about every purpose from a street car to a full spec race car out there, it is not a big deal to go this route, a bit costly labor -wise yes.

TB, Jon's car will be interesting to compare at Vmax, with its different weight, body shape, tire sizes and gearbox ratios.

Hijack off.

Kevin

In the US there are 5 sets running around that are. Originally installed from Ruf >> No.

JBL930

Cheers for all the info chaps, sorry for taking it slightly off topic Kevin. So the K24/26's will give more power at a safer boost level than the K16/24's, am i right in saying that the K16 platform will give less lag though?
I believe my engine has aftermarket cams, i don't know which ones though as they were fitted before i aquired the engine, solid lifters were fitted at the same time.
I think if 520bhp is the absolute limit without major modifications (rods, head welding and sealing) then i'll stick with my current set up for now. It would be great to get the same power at less boost but i'll wait until i need a rebuild before changing things again, my leakdown and compression numbers are great so it may be some time.
I will change my mind quite swiftly if i have a dissapointing results at Bruntingthorpe though

bb993tt

TurboR's done recently have K24 based turbos.

TB993tt

Am I correct in saying that the Ruf nomenclature Turbo R refers to the 993 conversion rated for TUV at 490PS so were the K16 based engine package ?

Yours is a later and no doubt better version but it is a hybrid custom engine rather than a Turbo R. I would guess that yours boosts at less than 1.1 bar at maximum power which bodes for less likelihood of the head leaking issue mentioned for the higher boost K16 version ?

bb993tt

That's why I said "done recently". My motor is the standard turboR , circa Q1/08. I didn't ask for anything custom, nor was I offered any choice in the matter. I did enquire about getting something similar to what LeonS has, but was discouraged of it, as I was with my central exhaust question. I only found out about the turbos by specifically asking about them. Paolo (pmf) and I were exchanging emails at the time, since his car was there as well. We were both told the same thing - K24's on one side and "something else" on the other, keeping up the Ruf mystique. I've never seen more than about 15 lbs on my difficult-to-read Andial boost gauge. They're sold as having 490PS and 650Nm, 'cos that's the number they guarantee. Results may vary, etc., etc. Both our engines produced noticeably more than that on the Ruf engine dyno.