turbo performance |
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turbo performance |
nsyr |
Jun 3 2004, 04:47 PM
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#1
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Because I Can Group: Members Posts: 314 Joined: 16-May 04 From: Tampa, FL Member No.: 2,073 |
I know there a few people out there with turbo 4's. Does anybody have any performance or reliability figures.
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Sammy |
Jun 4 2004, 11:50 AM
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#2
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. Group: Members Posts: 1,190 Joined: 21-January 03 From: Orange, Ca Member No.: 178 |
My best guess is that with the crap they call pump gas now days, about 175 hp would be the realistic limit for a reliable stock turbocharged 2 liter type 4 unless you get really carried away with the design (read expensive). You should be able to get over 150 from a 1.7 without too much problem.
It just like most automotive issues, you can get improvements fairly easily up to a point, then it starts getting harder and more expensive. the higher you try to go, the more it costs. That's one of the reasons why Jake's engines cost what they do, it aint easy to get that much power out of a n/a type 4 and have it last. Because of the intake and port limitations a type 4 does not breath very well hence the very mild stock cam. I'd bet most of the power increases Jake gets are in the heads, cam, and valve train. Pressurizing the intake overcomes those breathing limitations up to a certain point. one or two pounds of boost will make a surprizing difference on one of these cars. Figure at least 15 hp per pound of boost for the first few, then the increase starts to drop off. By the time you get over 5 psi you are prolly only going to be gaining around 10 hp max per pound of boost increase, maybe a little less. Above 7 the increase drops off more due to the efficiency of the turbo system and the heat of compression and the head design. |
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