TB993tt

Whilst the above is factual, as 911Q45 points out 993tt motors don't usually rev beyond 7000 so this isn't the main reason for the non hydraulics is it ?

Isn't it to do with getting cams with radical combinations of higher lift/longer duration (like the EVO M64/83 cams) to work with the hydraulic mechanism reliably ?
Veterans may remember this thread

https://rennlist.com/forums/showthre...ight=hydraulic

Acropora

I was told you need solid lifters w/ evo cams so in they went.

JBL930

There has been a hint of it having Schrick cams, i guess they would need to be removed to find out? Or is there somewhere i can look with them fitted that will tell me something?

Thanks for the info guys, good link TB cheers, I take it your car has the hydraulics?

TB993tt

Mine has had two different types of hydraulics (stock and 3.8RS N/A) and currently runs an iteration of the EVO M64/83 cam which is mechanical....

LA964RS

Here's a 993TT in a 964....this was a very long project. Got all my upgrade bits from Kevin however and pleased with them. The car is brilliant, but I don't think I'd do this again...way too long not having a car, lots of $$...and did I mention a long time not having a car?

If you want to go this way, try and buy one done already. They are out there, which only proves I'm not totally insane.

DM993tt

That may not buff out.

Brett B

At what RPM do you typically see the stock hydraulic lifters begin to break down? Rather, at what RPM range would you recommend switching over to solid lifters?

LA964RS

Its a turbo engine...why do you want to rev it any higher?

Brett B

I never said a thing about revving a stock turbo engine higher. I would like to know at approx what RPM PorschePhD feels the hydraulic lifters become inadequate.

eclou

Brett, any further updates/tuning to your fantastic project?

LA964RS

I think there is a deal where you use the 964 cam sprockets...for more accurate timing, and when you do that on the TT you should also switch to the solid lifters. Ask Kevin, he can tell you.

Brett B

Right now the car is just staying warm and clean in the garage hiding from all the snow and salt. So no changes really, just hoping for a clear dry day sometime soon so I can go drive it. I'm in contract for a bigger garage (with a bigger house attached ) which will give me some more room to tinker, but everything else has pretty much been on hold until that plays out.

WHB Porsche

I thought the 964 sprockets were only for early '95 cars which were fastened differently. I recall Later 993s going back to the 964-style sprockets?

Brett B

Being an early 95 originally NA car, my car does have the 964 style cam sprockets from the factory (still held in time by friction, without pins), it still has the factory hydraulic lifters as well. The 964 sprockets (with all of the other parts needed) will certainly make setting the cam timing easier since I don't have the Porsche cam/crank locking tools needed to set the timing otherwise. And yes, when setting cam timing with the 964 sprockets by the traditional method you need to use a couple solid lifters, even if only temporarily.

JBL930

I didn't want to start a new thread for such a simple question but i was hoping someone could answer this for me.
My 930 has brand new standard 930 fuel pumps fitted which have just been tested today and are delivering 1.2ltrs of fuel every 30 seconds (roughly 144ltrs per hour) and the running pressure is 4.4bar.
The 993tt engine is fitted with orange injectors and a 5.0bar fuel pressure regulator, can anyone tell me if the pumps are going to be OK for this set up, i'm picking the car up tomorrow to take to the tuners for mapping and i didn't want to waste my time if it needs bigger fuel pumps, also if there is anything else that could be an issue with this combination of components.

The car "should" produce something in the high (ish) 400bhp region, it would be good to hear what power you guys think it will produce and i'll post the graphs when i have them, the mods i'm aware of are as follows

K16/24 turbos (these are modified units with the hot side ported among other tweeks) with upgraded actuators
Evo BOV's
Solid lifters
Sport cams
Orange injectors
5bar regulator
Cat and muffler bypass, standard headers
K & N air filter

The engine will be mapped at Fearnsport, no fixed boost, but i've asked them to squeeze every available ounce of power they can but to keep things safe too, i'm guessing 1.0bar at WOT but short bursts above that in the midrange. What do you think?

Most importantly can someone answer the main fuel delivery question, thanks chaps It's almost there now and i'm getting a little excited