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Old 03-20-2008, 05:48 PM   #1
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Question about boosting engine

Well ive had plans to boost my car for a while. Ive already started to piece together a kit so that I can save a bit of money and learn about turbocharging as I go. Im wondering if 87k miles is going to be to old of an engine to boost. I was considering buying a used engine with less miles on it. Im worried because when we boosted my friends geo prism, we blew oil out of all its seals because the engine was so old.

Also wondering what people think of the internal wastegate on the turbocharger that i already purchased. Im not looking for huge boost (7-8 psi) because i just want to be around 200whp and have a safe setup. I plan on intercooling for safety too. Here are a few pics and please let me know what you think.





Thanks!


Oh would also like to say that this is a budget turbo lol. Im a college student but still want some boost and learn about it while i make the kit.

EDIT: Also wondering what size intercooler most of you guys are running. I need to get one soon so that i can start laying things out.


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Old 03-20-2008, 06:41 PM   #2
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looks like a volvo turbo ....

anyway, 8lbs of boost (esp on that turbo) isn't going to get you near 200whp unless you raise the compression of the engine. However, the internal wastegate would be able to do 8psi (in fact, it should be set around there already). I have heard of people boosting engines with much more mileage than yours. Bigger question is, how well maintained was the engine. If it was well maintained and with that low of boost you should be fine. As far as intercoolers a small front mount will do fine or even a side mount (for budget reasons). One more item for your consideration, you need to reference your boost from the intake manifold b/c there will be a small pressure drop (loss) in the intercooler.
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Old 03-20-2008, 08:26 PM   #3
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I beg to differ... 8psi will give you right at 80whp on top of what ever the engine already makes... which should put you real close to your 200whp goal.

I would also do a compression check on the engine to make sure that the rings can handle the boost.
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Old 03-20-2008, 08:34 PM   #4
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x2 do a compression check, if theyre all around 180-190 then youre good to go

its tough to know what the wastegate on that turbo will do, you can either search online or hook it up and try it lol

fwiw I will be playing with tuning on my 172k mile (right now, by then it will be 180k+) block before I build a block with better internals. Why? I dont care if I blow this one lol
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Old 03-20-2008, 08:49 PM   #5
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Yeah I was kinda figuring if i blow this engine w/e i can always buy another one for around 400 dollars with about 1/2 the miles. Id just rather not if i could. Ok ill take a look at my compression. I dont quite remember but im pretty sure this wategate will support the 8 psi, i was just unsure about the style. I havent seen very many with this style.

What about intercooler size? I was thinking fmic, but ive also toyed around with watercooled. What do you guys think would be better? (reason for watercooled would be less piping to run and less lose of psi b/c of less piping). I do plan on relocating the battery to the hatch so that i have plenty of room for water cooled. Thanks so much for the responses so far!
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Old 03-20-2008, 08:59 PM   #6
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WOW I am gonna look into air-water IC's a little further.... this guy went from IAT of 307 to 161 degrees F.....

http://www.key-ideas.com/AirWaterIC.htm
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Old 03-20-2008, 10:04 PM   #7
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Quote:
Originally Posted by 03OrangeSVT View Post
I beg to differ... 8psi will give you right at 80whp on top of what ever the engine already makes... which should put you real close to your 200whp goal.

I would also do a compression check on the engine to make sure that the rings can handle the boost.
A stock zetec engine makes 120 stock?

I guess I won't argue with you as you have more experience with this.

BTW I didn't say he wouldn't get close (190ish), he said 200 and I said no. I should have been more clear, my bad.


Back to the question:
Ask xp0s3d, he runs air to water. See what his opinion is.
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Old 03-20-2008, 10:33 PM   #8
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Well from what i read, along with the lower iat's than air to air intercoolers, because of the less amount of intake piping needed means less psi loss from the turbo to the intake manifold. I dont remember where i read it exactly but there was a ratio for each ft of piping = a certain drop in psi.
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Old 03-21-2008, 12:14 AM   #9
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Little trick to test the WG. Hook up a nosel to your air compressor you a meter gauge that lets X PSI travel through the hose, slowly raise it from 3psi to 8,9,or 10 Watch for the WG to open when it does thats what it is set at.
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Old 03-21-2008, 06:25 AM   #10
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worse than feet of piping are bends, the more bends you have the more boost you lose. If not designed correctly, the air-water exchanger can be a huge pressure pit.

Ive seen people concerned about weight, but it seems to me that if you dont want or need to run an ice tank, you'll only need about a gallon of fluid.

And dont forget to throw some antifreeze in there during really hot and really cold times of the year... it would suck to have the water boil and the lines inside the exchanger burst and then you have water in your intake... lots of it... or to have it freeze and then you pump gets burned up.
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