Turbocharging a type 4 |
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Turbocharging a type 4 |
stownsen914 |
Oct 12 2016, 02:04 PM
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#1
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Senior Member Group: Members Posts: 928 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
I have heard the conventional wisdom that "you can't turbocharge a type 4 successfully." Is it just difficult, or can it really not be done well? I'm tossing around the crazy idea of turbo'ing a type 4 for PCA club racing, to put in the chassis in my avatar. My 6 in its current configuration is not competitive, so I can put a bunch of money in that, or do something different. I like a challenge, so why wouldn't the following work?
- 1.8 or 2.0 type 4 as a base. I would keep displacement stock or close to it. - EFI for induction - Properly sized intercooler and huge oil cooler - A good aftermarket cooling fan - Would be dry sumped - I would work with a knowledgeable builder or shop to build the engine. I am not so familiar with type 4 race modifications, but presumably this would include reinforcing the bottom end, using Carrillo, Pauter, etc. rods - Obviously the heads would need to be reworked for flow and possibly reliability If I do the above, could a type 4 be built to withstand 15 psi of boost and make 350 hp reliably? Scott |
iamchappy |
Oct 22 2016, 05:37 PM
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#2
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It all happens so fast! Group: Members Posts: 4,893 Joined: 5-November 03 From: minnetonka, mn Member No.: 1,315 Region Association: Upper MidWest |
This is so much easier.
Attached image(s) |
stownsen914 |
Oct 23 2016, 11:02 AM
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#3
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Senior Member Group: Members Posts: 928 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
I'd love to just turbo my 911 motor, but the hp index for 911 turbos is not advantageous. PCA club racing classifies the 911 turbo as 210 hp/L, while the type 4 turbo is 150 hp/L. To run a 2.0L 911 turbo, I'd have to add 200 lbs to my 914 and still bump up one class. With the type 4, I can do a 1.8 or 2.0L turbo and stay in the same class at my current weight (~2000 lbs with me in the car).
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stownsen914 |
Oct 24 2016, 01:42 PM
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#4
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Senior Member Group: Members Posts: 928 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
So if I did this with a T4, I think I understood that it would be better to start with a 1.7 or 1.8. I did some reading over the weekend, and it looks like the 1.7 heads may be sturdy. The carb 1.8 heads have the biggest valves of any T4 (not sure if that matters since I'd probably have to increase valve sizes anyway). And don't use a motor out of a bus since the heads are more likely to be trashed from hard use.
What's the best base T4 motor to start with for a small displacement turbo? |
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