Ok..after I EFI my 2.4T, is turbo reasonable?

Zendalar · 05-15-2003, 04:37 AM

After I have built my Megasquirt unit and successfully got it running, i was wondering if one could turbo that setup feasibly?

I mean the 2.4T engine has very low compression ratio that would be ideal for a turbo. Just wondering if the cams and pistons are suitable...?`

Wayne 962 · Wayne 962's Garage

Hmm, that's a broad question. You can place a blower on just about anything, however, I think you would want even lower compression, otherwise you wouldn't be able to run with much boost...

-Wayne

turbo6bar · 05-18-2003, 07:42 AM

You should check with tbitz. He has a 3.0 running with Megasquirt, and his future plans include a turbo. I haven't spoken to anyone who thinks a stock engine with 4-6 psi of boost would present great risks. Once you go over a threshhold, things are not so easy.

Corky Bell has been consistent in saying that virtually all stock engines are capable of handling boost. It's just a matter of knowing the limits.

I am seriously considering the Megasquirt on my SC.

Just my opinion.
Jurgen

TimT · 05-18-2003, 08:06 AM

The T pistons are cast, not forged. This may present a problem when turboing this engine. I have all the bits to make a small displacement turbo engine (I may stick it in my 914) Ive decided when I take the plunge and build the motor, Ill get 8:1 JE pistons.

I have the whole intake and injection system from a 3.0 turbo, I also have a Link EFI computer so I could got with CIS or EFI, so many possibilities......

Other than the pistons, Id also shuffle pin the case and use premium hardware on the head studs,and rod bolts..and use a 964 or 930 oil pump

snowman · 05-18-2003, 12:21 PM

I will add to the info allready given on the T engineas follows:

1. The T crank isn't as strong as the S crank

2. The rods are not shot peened like the S rods are. For a small cost they can be shot peened by a company called Metal Improvement Co, A nationwide company. Do not use anyone who dosen't supply Alum specs and cupons with the job, its a controlled process and just shooting steel shot at the rods dosen't work.

3. Squirters are required.

4. External oil cooling is required.

Get an S to start with.

TimT · 05-18-2003, 04:50 PM

The T crank is the least of the issues. In some circles short stroke T cranks are very desireable (ask some gt5 racers)

A small displacement turbo is way cool.. I will build one soon...

Make sure you do all the improvements to the case...and yada yada use the best fasteners

snowman · 09:50 PM

Isn't the T crank a cast crank, vs the fordged S crank??

I had my T crank shot peened just to be sure. All the radius es, as well as everything else that might crack. If you are going to use a cast crank this is the only way to go.

Zendalar · 05-19-2003, 12:23 PM

But why is it that one can upgrade the engine to S specs, lets say 200hp and be done with it, without any upgrades to case. My idea is to get some 200hp out of this T engine, so I was thinking it might hold just fine...or would it?

snowman · 05-19-2003, 09:11 PM

You better suffle pin the case, like Tim T suggested, use good hardware, pistons, rods, squirters, external oil cooler, shot peen everything, cause if you don't it could break. Anything over 6000 RPM and 130 HP requires these fixes, Porsche didn't do all this stuff just to make it cost more.

airsix · 05-20-2003, 12:29 PM

Quote:

Originally posted by Zendalar
But why is it that one can upgrade the engine to S specs, lets say 200hp and be done with it, without any upgrades to case. My idea is to get some 200hp out of this T engine, so I was thinking it might hold just fine...or would it?

I think you are on the right track. The two things excerting forces on the engine case, rods, pistons, rod-bolts, etc. are the cylinder pressure and the inertial forces of the rotating/reciprocating parts. If you spin the motor faster you increase the forces. If you increase the cylinder pressures you increase the forces. What does turbo-ing do? You probably won't spin the motor any faster, so cross that one off the list. Will turbo-ing increase the cylinder pressures? Ahh!!! Here's the rub! In many cases a properly done turbo will increase (even double) the AVERAGE cylinder pressure while only slightly raising the MAXIMUM pressure. You'll still need to keep it cool though.

-Ben M.