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: 913 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 |
McMark |
Oct 17 2016, 12:22 PM
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#2
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Twin spark for:
1. High compression 2. Big bore |
Mueller |
Oct 17 2016, 03:46 PM
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#3
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
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McMark |
Oct 18 2016, 08:46 AM
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#4
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Twin spark for: I would think forcing more into the cylinders via a turbo would be increasing the cylinder pressure just like increasing the compression.1. High compression 2. Big bore QUOTE My suggestion for minimizing heat gain from the turbo is to run a larger turbo and run low boost. I'm missing the correlation between big turbo and low boost? I get low boost, but you presented it as if those two work in tandem. My first two thoughts on turbo size relate to 1. what rpm the turbo kicks in and 2. what rpm the turbo starts impeding exhaust flow. But I agree with all your benefits of running low boost.Most new production cars with turbos are running higher compression, small turbos and lower boost. Giving good off-boost performance and a nice little kick when the turbo spools. |
stownsen914 |
Oct 18 2016, 11:19 AM
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#5
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Senior Member Group: Members Posts: 913 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
I'm missing the correlation between big turbo and low boost? I get low boost, but you presented it as if those two work in tandem. I read his comment to mean that a smaller turbo, when pushed hard, tends to generate more heat than a larger turbo. I would be building this for track use only, so the logic makes sense to me. |
jd74914 |
Oct 18 2016, 01:34 PM
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#6
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Its alive Group: Members Posts: 4,780 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
I'm missing the correlation between big turbo and low boost? I get low boost, but you presented it as if those two work in tandem. I read his comment to mean that a smaller turbo, when pushed hard, tends to generate more heat than a larger turbo. I would be building this for track use only, so the logic makes sense to me. I would think you'd be shooting for the most efficient spot on the turbine and compressor maps to keep heat generation down and pressure drop across the turbine relatively low. This likely equates to a larger turbo than would generally be selected since low rev drive-ability isn't really a concern for a track car. |
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