type 4 turbo guys-, what turbo did you pick and why- Options

[ottox914]

Alot of turbo talk lately. Just curious, for those who have been there/done that, what turbo did you pick, why, and if your project is on the road, how do you like it?

[Jake Raby]

Big Kat,
My teener is just up the road from you getting its fab work done for the Turbo... I bet you are the guy that checked it out over on the TARMAC, huh??

Like I said, this isn't just for the 914- The 914 just happens to be my patient for this first serious experience and development.

Everything I plan on working with will be intercooled, I feel it is necessary to overcome even the simplest of the design flaws in the stock engine, even while running less boost.

Let me stress that 20 PSI boost is not going to be something I even expect the stock engine to take at all. I feel that the sealing of the heads will be the huge limiting factor closely followed by the cast pistons. Like I said, thats why I'm going to intentionally increase boost incrementally all while doing compression and leakdown checks at each increase to see where things start to go down hill and THEn I'll keep on until it looks like 3 Mile island inside!

I certainly can see a Turbo specific engine of mine with correct design and superior parts handling 20 PSI boost, even with stock cylinders. I am designing that engine primarily for strength and its getting all my valvetrain upgrades as well as all the coatings. The big kicker is the twin plug ignition, which will add a TON of detonation resistance in its own right.

Cam changes, how about 8-10 different tear downs and cam swaps with their respective dyno sessions! Thats what I see happening with this test beast as well as the compressor and boost changes that can be expected. FYI- I ordered 8 of these Turbo pistons instead of 4 because i also expect to melt them as well at some point and that way I'll be ready!

If Len can get me another set of heads prepped for this beast engine I will also do a bore increase up to the 98 and 100mm Nickies and see what displacement does to power and boost and of course heat and how the Nickies can help with all that...

Like I said- I have a FULL YEAR of Turbo R&D funds and time allocated to this and I'm not playing around- Not at all.

QUOTE

7 psi on a completely stock 2 liter with no intercooler will get you 160 hp, maybe more. Not much testing required there, it's easy to do and has been done.

But how long will it hold the boost and what will let go first? when will the stock head studs compromise? When will the rod bearings die? when will those 800 gram rods with shitty stock bolts let go?? When will the Mahle pistons become "perforated"??

I'll know ALL of that (and so will you) by this time next year!

BTW- Who knows how to upload streaming video to the net?? I'd gladly broadcast from the death chamber for all to see and MAYBE we can even get the datalogger information streamed as well.

I'm about 3 weeks away from the first round of testing.