2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

How important IS the intercooler?

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Old Mar 3, 2003 | 09:01 PM
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How important IS the intercooler?

hey everyone, I'm buying a TII this week that has a non-turbo hood. Now obviously i know the intercooler's not getting any air, but besides a loss of maybe a few horses (?) and a lot of good looking hood scoop, what effect does this have on the motor?
any info would be great.

thanks all, alexi
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Old Mar 3, 2003 | 09:03 PM
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umm... how long has it been driven like that?? your sure it doesn't have a frount mount intercooler?

are you sure it's a turbo II and not a N/A with a turbo motor swaped in?

if he's been driving around with no air to the intercooler it's quite possible the engine is damaged. the intercooler is a must if he is boosting.
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Old Mar 3, 2003 | 09:14 PM
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If it's stock it can probably do ok without the intercooler... once you do mods it will kill it pretty quick.

In fact, you will find alot of cars of the same era with turbo engines with no intercooler. Just dont plan on doing any mods until you get one.
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Old Mar 3, 2003 | 09:34 PM
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hah, yeah I doubt it is a TII, I don't think an N/A hook would clear the TII intercooler, personally I wouldn't buy a car that didn't have an intercooler, it will cost a pretty penny to buy and install one, and the truth is even if the engine wasn't over used the high amounts of heat are never good for the internal parts of the motor, also the high amounts of heat make it very prone to detenation...
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Old Mar 3, 2003 | 09:54 PM
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ok here's the deal with it. it IS a turbo II; the guy was going to install a front mount and even did a lot of the cutting but never finished it. hood was replaced after previous owner hit a deer. intercooler is still there, and functioning, just not getting any air. the car also has an intake and downpipe, and is definetely boosting. also, i doubted it too, but the N/A hood does clear the intercooler...anyway if any damage could have been done i'm not too sure...it's only been driven like this for maybe 6 months or so i think
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Old Mar 4, 2003 | 04:57 AM
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Originally posted by 88 SE
If it's stock it can probably do ok without the intercooler...
Absolutely not. Even in stock form the turbo adds an incredible amount of heat to the air under full load, and not removing at least some of that heat is likely to cause detonation.
...you will find alot of cars of the same era with turbo engines with no intercooler.
Yes, but they had lower boost, and their A/F ratios and ignition timing were tuned around the higher air temps.

Last edited by NZConvertible; Mar 4, 2003 at 05:04 AM.
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Old Mar 4, 2003 | 04:59 AM
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Oops, wrong button!

Last edited by NZConvertible; Mar 4, 2003 at 05:07 AM.
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Old Mar 4, 2003 | 05:57 AM
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Generally, everyone's right. The TII intercooler doesn't fit under the NA hood, unless 1) it's been mashed down, 2) the hood's been cut, or 3) someone just slammed it hard enough that the hood bent around it. You can get it closed, and it'll stay in place, but it bends the hood and/or the intercooler.
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Old Mar 4, 2003 | 06:36 AM
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I'd say if it were only running the 5.5 lbs of boost, you'd be okay. Look at all the turbo/supercharger kits out there. How many come with an intercooler? Provided you under about 7 psi, you *should* be alright. I believe Mazda wanted to pump up the power out of these cars from the factory, but feared warranty issues, so the turned the boost down to a LOW 5.5. However, with the mods on your car, unless you're good with the throttle, you'll probably be spiking we'll over 7 psi. Get the compression checked and if it's alright, then just take it easy till you get a FMIC or put a vent in your hood.
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Old Mar 4, 2003 | 07:17 AM
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I'd ask the price to be lowered because the engine has probably been damamged... unless it's already really cheap.
Then go buy yourself a Starion intercooler, finish the job, and pray the engine holds together long enough for you to afford a rebuild.
Good luck
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Old Mar 4, 2003 | 07:54 AM
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Jeez, pretty damned paranoid. If the intercooler's still under the hood, and there's an NA hood ontop of it, I *REALLY* doubt there's any damage done. Especially if everything else is stock still. As everyone says, those damn TII vents don't flow much anyway!
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Old Mar 4, 2003 | 12:41 PM
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hey thanks everyone for the input. the car is $3300 as is, with 110,000 original miles. new paint, very nice looking. heres the great part; i have a starion too, which i'll be selling of course, but perhaps i can take the intercooler out of it and sell without? i don't know how much plumbing is required for the TII conversion, but it is possible isn't it?
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Old Mar 4, 2003 | 01:08 PM
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Holy Crap! Is that 3300 pesos? That would be fair. 3300USD is outrageous. I think that you should offer about 1000$. I wouldn't pay any more than that for a car with the wrong hood, questionable history, and over 100,000 mi on a turbo motor. Good Luck.
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Old Mar 4, 2003 | 10:45 PM
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I'd agree that 3300 might be a bit high. If it is VERY nice, I wouldn't go over $3k.
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Old Mar 6, 2003 | 09:52 PM
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hey everyone, ok i didn't get the car. went down to pick it up today and after driving it to an auction to do the paperwork, realized, with much thanks to my friend following me, that the car smoked after every shift or so, and besides this realized that the engine was a bit gutless (just felt like low compression with a bunch of turbo boost covering it up). with the smoking I knew there was no way i would buy, so i told the guy i was sorry and wished him luck anyway thanks for all the help, i'm off to find a nicer TII, or at least one that won't need a turbo anytime soon.

alexi
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Old Mar 6, 2003 | 09:57 PM
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oh, by the way, turbo IIs are pretty f---n hard to find in reasonably nice condition for less than $4000. most that i've seen on this site that aren't junk or need work are $4-5k. anyway, that's why $3300 for this immaculate LOOKING car seemed reasonable to me at the time, just in my defense

thanks again!
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Old Mar 6, 2003 | 10:08 PM
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When air is compressed it heats up - why would you want to pump hot air into the intake - If you hit it hard and long you will cause damage in very little time.

Also the price is much too high for a non genuine TII - and repainted ??? I know I would RUN away with that mileage
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