Quote:
Originally posted by jim_howard_pdx
A turbo typically will not cause anything to break on the engine, rather the 1400 degree heat will super cook the engine bay. All the hoses and belts will need to be repaced every 25-50 k miles. The engine oil will be severly effected, meaning you have to run much better quality oil, and you need to change it more often.
When you shut down the engine, oil flow stops to the turbo bearings. The 1400 degree heat is still there. The oil burns and over time it will "coke" the housing and the bearing will go bye bye.
At 15 psi, you are almost doubling your volumetric efficiency of the engine. A 200 hp engine will develop about 375 hp at 6500 RPM. Go above 15 psi and your head gaskets, piston surface, valves, rings and everything will deteriorate. You can expect fairly expensive tear down and rebuilds every 100-150k miles. Many times it is cheaper to buy new turbos than fix the old ones.
A turbo is not an engine for a 19 year old on a limited budget. A twin turbo is not an engine for someone without access to dyno time, with extra money for tuning the engine for maximum power.
Really. You are not going to beat on rice rockets just because of the turbo. You beat up on competitors by having more off line torque. A 302 with decent home ported heads, cam, intake, and gears can easily run mid twelve to mid thirteen second quarters. Most rice rockets run 15.25 to 15.75 second ets. So you will have street and strip dominance without high expense.
If you want a good turbo car, look for a buick grand national. They could turn 12.1 quarter mile times with only mild modifications. Just remember you will be paying for rebuilding the turbo and the engine on a more frequent basis.
I really hate tubos on street cars. They are designed for racing at very high rpms. This is not a cheap way to go.
But good luck, and I wish you well. Keep your dollars totalled up. When you go past 1500 dollars, realize a 5 speed 302 would now be running 12.50's. Where are you now?????
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Jim, I know it sounds like I'm picking on you, but let me try an provide my answers to some of your replys.
Replacing hoses ever 25-50 k miles. Where did you get your information, just curious? What kind of person would spend the time and money to build any kind of high performance motor, whether it be NA, blower, nitrous, or turbo and then not mind replacing a few hoses ever so often. Seems like a cheap price to pay for the amount of hp and torque a turbo will provide.
And who builds the above mentioned type of motor and then uses cheap oil. Come on now, we know better.
A cheap turbo timer maintains oil circulation once the engine is turned off. Vortech or Paxton blowers both run oil through them, does the same "coking" not happen with them as well?
As far as the 15 psi comment, let me throw this combination out there to you. Trick Fow intake & heads, stock cam, bigger fuel system, and a T-72, all backed with a tremec and 3.55 gears. What kind of numbers you think it makes and runs at the track? Try 494 rwhp and 536 ft/lbs or torque and a 10.82 at 129 mph. All on only 9 lbs of boost on a stock bottom end 302. It's also an ever day driver. V8s don't require the high amounts of boost that the GN and Supra 6s take to run fast.
And who doesn't rebuild a race motor once it hits 100 k miles, most do it before then.
I wil agree with you on the money and age thing though. If your on a budget, a turbo setup may not be the best thing for you.
And turbos are not for high rpm applications. Where do you think a GN shifts at, most barely over 5000 rpms. And I know of no one with a turbo on a mustang that shifts and higher than 6000 rpms. You just don't have to spin a turbo to high rpms to make power.
And with some of the right connections (i.e; someone that can weld and do some fabrication), you can build a JY setup for less than the above mentioned $1500.
Keep em coming, I like trying to dispell some of the myths about turbos
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