Let's point out a few flaws:
1. You do not have 140horsepower. The engine has 140 horsepower, with no accessories, no exhaust, no transmission, etc. Actual output? Around 115-120. IF you're lucky. If you haven't gotten a tune up and oil change, air filter, etc recently, you're probably more like 110-115.
2. A cheap turbo from eBay. Which part of that sentence seems like it would even remotely be a good idea? A decent turbo, will cost you in the neighborhood of $800+. Just the turbo. An entire kit, can run around $3000+. What you are looking at, is poor quality, and will not last long. It will break, and it will destroy your engine when it happens.
3. What kind of gains? Do you understand how a turbo works? It has variable levels of PSI. Based on the levels of PSI, based on what else you've done to the engine, based on what octane you're running, based on intercooler efficiency...etc....you can have anywhere from a loss of horsepower, to around 100gained horsepower.
But since you didn't provide a single bit of information that would allow anyone to figure that out....there's no way to say. If you're just putting a turbo on it, and not upgrading the engine or anything else...and getting a cheap eBay turbo....I'd imagine you'd see somewhere around 150wheel horsepower. A 35 whp gain. That's VERY optimistic. And after a month, the engine will explode.
If it makes it to a month.
And then you will have a 150 horsepower loss.
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