Oldsmobile M90 SUpercharger?

[Leo(209)(707)]

So, i am cruising craigslist for the usual deals on things that i want, but only for dirt cheap. I search "M90" in hopes to find a cheap supercharger. Luck would have it, and there was one for $80.

The seller quotes, "I am selling an Eaton m90 supercharger off of a 1994Oldsmobile. If interested feel free to call or text"

My questions are
-Is that a decent supercharger to use?
-Is that even an M90?

I google searched it and some picture had captions saying its an M62. What do you all think?

Thanks.

 

[Phoenix]

Aint a M90 off a T-bird SC?

 

[LOUDSHO92]

So, i am cruising craigslist for the usual deals on things that i want, but only for dirt cheap. I search "M90" in hopes to find a cheap supercharger. Luck would have it, and there was one for $80.

The seller quotes, "I am selling an Eaton m90 supercharger off of a 1994Oldsmobile. If interested feel free to call or text"

My questions are
-Is that a decent supercharger to use?
-Is that even an M90?

I google searched it and some picture had captions saying its an M62. What do you all think?

Thanks.

The supercharged 3.8 from Chevy/Pontiac all use an M90 supercharger.

It sounds like it would be an earlier version of the supercharger and may not be as efficient. If you want to use this supercharger you would be doing a lot of custom fabrication to mount on top and cut a hole in the hood. You can do it on the side but even then a lot of custom fabrication. Also the S/C is not meant to keep up very well with the SHO.

If you want cheap it will not be chap in the long run.

We do offer a complete turbo kit at SHO Source but it wont be dirt cheap.

 

[Leo(209)(707)]

Thanks for the info Loudsho92, but this isnt a Chevy or Pontiac. You can enlighten me here cuz i truely dont know, but is Oldsmobile a part of one of those brands like Mercury is to Ford?

 

[luigisho]

Yes. Olds is (was) part of the GM family and they all shared powertrains across platforms. I have an '02 Pontiac Grand Prix GTP and it has the same 3.8 supercharged motor.

 

[Leo(209)(707)]

Cool. Thanks.

So if i am looking for a cheap M90 this would be it? If thats the case ill go and pick it up this weekend.

 

[rubydist]

The gm supercharged cars used m90 or m62 so make sure it is a m90.
The sc will run out of steam before 7000 rpm and will require intercooling but i believe it will fit on the trans end of the engine with a shaft drive if you want to do the work.
It will not be cheap...

 

[intimdatr]

Its been done a few times before, and is not for the faint of heart.

And the ford 3.8 S/C setup is copy of the Chevy 3.8 S/C idea.

 

[LOUDSHO92]

Cool. Thanks.

So if i am looking for a cheap M90 this would be it? If thats the case ill go and pick it up this weekend.

It will "work" but it will not be cheap. You will have a lot fabrication to do.

This supercharger is not the best unit to work with the SHO motor and will not keep up very well.

 

[Leo(209)(707)]

Thanks for the info. The guy on craigslist was a 2 hour drive away and i didnt want to waste the time going out there just to find out it was an M62 so i let this deal slide.

I am aware that this isnt the best supercharger for the job, but i wasn't looking for any absurd numbers for HP either. I haven't crunched the numbers, but i was just thinking light boost and to try and make it fit the stock fuel system. It seems like that's what makes boosting so expensive, FPR and new fuel pump=$$. How much horsepower do you think the stock fuel system can handle anyways?

 

[Off Road SHO]

I used an M-90 from a first generation Thunderbird SuperCoupe and while it did give me some low end grunt, at 5k rpm's the SHO motor was outrunning it. If you're **** bent on a Roots style SC for the SHO, use a bigger unit like from the Ford Lightning truck, an M112. I pushes 112 cubic inches per revolution, so you wont have to spin it as fast as the M-90 to get the same amount of air. The Roots style blowers get inefficient at high rpm's and also heat up the air more. A lot of the Lightning guys are converting to turbo so you can get the old M-112 for 500.00 or less.

If you want cheap, and don't want to tune or buy injectors and fuel pump regulator, go turbo and limit boost to 6 psi.

Tom

 

[Leo(209)(707)]

Wouldn't it be a little cheaper to run a SC setup? With a turbo you have to rework your intake, exhaust, plum cooling to turbo, and I'm sure some other things. Whereas with a SC its just a bracket then rework your intake.

If i was only looking for 6lbs of boost would an M90 be able to keep that up?

 

[LOUDSHO92]

Thanks for the info. The guy on craigslist was a 2 hour drive away and i didnt want to waste the time going out there just to find out it was an M62 so i let this deal slide.

I am aware that this isnt the best supercharger for the job, but i wasn't looking for any absurd numbers for HP either. I haven't crunched the numbers, but i was just thinking light boost and to try and make it fit the stock fuel system. It seems like that's what makes boosting so expensive, FPR and new fuel pump=$$. How much horsepower do you think the stock fuel system can handle anyways?

The stock sysem can only handle 300hp and even then you are pushing it. I know of 1 person who did bolt up a M90 on a stock fuel system and it ran out at 5k. The stock system is not meant for boost.

It is expensive because there is a lot of parts and custom fabrication. When I did the turbo system I tried to keep cost down but there are a of parts you have to account for. You still have to tune as well.

Wouldn't it be a little cheaper to run a SC setup? With a turbo you have to rework your intake, exhaust, plum cooling to turbo, and I'm sure some other things. Whereas with a SC its just a bracket then rework your intake.

If i was only looking for 6lbs of boost would an M90 be able to keep that up?

You might want to see our turbo system. It is meant to bolt up to the stock engine using the stock intake and exhaust manifold. I am in So Cal you can come and even check it out and see what it takes.

For the S/C you have to make the brackets and re-do the pulley system. You also have to fabricate the new piping. You still have oil lines to worry about. Unless you have a machine shop it will still cost money to fabricate.

If you are trying to boost on the cheap it will have deficiencies and may have problems.

 

[jayro]

The sho motor does well with boost, but the systems surrounding it were not designed for it at all. Trans is weak, fuel and MAF will be maxed out almost instantly. You need to upgrade the systems which means a tune is a must. That along with the fabrication you will need to do means that boosting a sho is not cheap. As far as kits, you have Sho Source and (I believe)FPS. Both are very low production number kits, so the price is high. You are paying someone else to fabricate it for you.

 

[Leo(209)(707)]

Ya, i know im hunting a unicorn a little here with a low cost boost setup. But if the stock fuel system can push 300hp i wouldnt mind getting near it(thats a **** of a lot more than 220). I figure the two biggest cost parts are the Tweecer and the S/C itself (I can manage the Fab work). I already have an 80mm MAF on the shelf, just waiting on that tweecer (keeping an eye on ebay for a cheap deal). I am in no hurry for this build so i have the time to hold out for a great deal on parts. I hope to eventually have a story of how i boosted my SHO for under a grand. Wish me luck.

 

[jayro]

how i boosted my SHO for under a grand. Wish me luck.

Good luck! Didn't somebody score a SC SHO for like $500. It was purchased from an automitive shop.....the customer didnt want to pay for the repair and just left it. The guy wanted it gone.

If my math is correct 5-6psi I will put you in the 300 chp range.

 

[TimboSHO]

Good luck! Didn't somebody score a SC SHO for like $500. It was purchased from an automitive shop.....the customer didnt want to pay for the repair and just left it. The guy wanted it gone.

You are correct, it was bought by a forum member a year or so ago, and recently sold on here for 7 times what he paid for it! Still a killer deal!

 

[jayro]

You are correct, it was bought by a forum member a year or so ago, and recently sold on here for 7 times what he paid for it! Still a killer deal!

I just remember being extremely jealous of him and happy at the same time. I wanted to give him a big hug and then kick him in the nuts!!

 

[copperpacecar]

sorry if im repeating someone as i didnt read the entire thread but if you are gonna take a sc off the gm3800 then get one off the 04 or newer. they look almost identical but the last generation produced far more boost more efficently. im running a 3.0 pulley on mine with meth injection as im not a fan of the custom intercoolers on the market, and i produce about 14.2 lbs of boost at 6400rpm. the coatings on the sc for the 04 and newer is also better. if you wanna cheaply intercool and choose meth as i did then your pre2004 teflon coating will come off.