Have questions about the M90 SC? Come here first.

[JayLS5]

I'm getting really sick of seeing the same questions over and over again, so made a write up.


The supercharger:

The M90 supercharger is an older OEM ford blower made by Eaton. It is a roots style blower with the following characteristics:





The M112 blower WILL NOT WORK WITHOUT MAJOR FABRICATION.

The M90 was put on ford thunderbird SC models and cougar XR7's. They come intercooled from the factory, a very crappy one.

This was my modified SC engine from a year or so ago: http://www.radford.edu/~jseemuell/engine.JPG

It was originally produced in 1989. All were underrated. The 89-93 model setups have very poor flowing characteristics: blower's inlet, the inlet plenum, rotors, etc.

The 94-95 SC engines were upgraded. The plenum was improved, the rotors were Teflon coated for reduced temperature, and the throttle body was enlarged to 70mm from ~60mm to match the plenum. The 89 style received 30lb injectors and the 94-95 is 36lb with a better fuel pump. The setup was so more efficient that Ford put on a larger blower pulley to achieve the same boost levels that the previous models had received, and got a little more power. The 89-93 models were rated at 210hp/315tq, and the 94-95 were 230hp/330tq.

Most people end up finding the less efficient style for the swap. If you decide to run the stock 30lb supercoupe injectors, you will be limited to about 265whp and 350tq – not too bad.

The stock boost is between 10-12 PSI, which depends on how well the engine flows. Of course, you have a large array of pulleys to choose from to put on your setup. An OEM 94-95 style on an 89-93 blower will reduce the boost 1-2 PSI. Conversely, an 89-93 OEM pully on a 94-95 blower will raise stock PSI by 1-2. Overdrive pulleys are available for each kind. One just has to use common sense; the 10% 89-93 style overdrive pulley will obviously be the smallest (the one in my engine picture). More overdrive is not necessarily better, as the already weak intercooler and crappy flowing parts get heat-soaked quickly. I wouldn’t even bother with a 10% on a near stock engine due to the immense heat increase that would negate much of the gains over the 5%.

More info: (mainly single port stuff, but important information as well)

Assuming you are just doing the swap onto your stock short block, you MUST upgrade the injectors and fuel pump. You MUST have dual exhaust at a minimal, or you greatly increase the chance of head gasket failure. The 94-95 V6 mustangs are a little easier to swap because the 96-98 changed a few things. The 94-95, however, should definitely consider using the supercoupe heads. The valvesprings are stronger, it flows a little better, but most importantly, it has improved cooling passages which greatly decreased head gasket failure (95 stangs had a recall). The supercoupes had head gasket problems as well, but this can be attributed to their stock exhaust system. It was terribly designed with a 90 degree bend and poor flowing parts... which netted an end result of 15psi of backpressure. Thankfully, a simple GT take off system will due for our cars, and we basically have shorty headers straight from the factory (as opposed to the SC's log style manifolds). Other than fuel and exhaust, we need a tune to go along with it after everything is assembled. These are the only NECESSARY factors; cam, rear end, high stall, clutch, etc will simply compliment the setup. Obviously, with an engine of this power, stock parts are more likely to break. If you have the ability to upgrade things while you’re in there, do it. Preventative maintenance is a good thing.

Split ports:

The stock fuel system is a bit better, but I honestly wouldn’t risk keeping this stock either. You must switch back to the return style fuel system anyway (255lph walbro is good). Of course, a tune is required. As we all know, split port mustangs have different manifolds and heads that offer much better flow over OEM single ports. In order to get the M90 to work on your car, you MUST go back to single port. This isn’t necessarily a bad thing, since there are several companies that offer single port heads that compete with PORTED split port heads. Big valve single-port heads would be a great improvement in flow over your stock split port engine’s. The only other setback of the single port design was the maximum throttle body size (60mm) that was limited by the upper intake manifold. Thankfully, the blower replaces this manifold and the inlet plenum connects to the throttle body. Even the stock, poorly flowing, 89-93 design plenum can be ported to accommodate a 70mm TB. The rotating assembly is comparable if not better than the supercoupe’s, so the splitport short block is actually preferred.


How to: (UPDATED)

A guy on V6 power has already done a great write up (general overview) with several pics included.
http://www.v6power.net/forum/viewtopic.php?t=10857


Found a radiator hose that fits perfectly:
Upper Radiator hose from a 1992 Buick Roadmaster (if it matters its an estate wagon)

Changing the throttle cable is NOT NECESSARY! Slight "ghetto rigging" required, but it's definitely possible. I'll have pictures of it sometime soon.

Potential modifications:

One of the best parts about this engine is the platform! It is extremely easy to make power with these motors. Intakes, throttle bodies, inlet plenum/blower packages, raised supercharger tops (stock ones suck, the one featured in my picture is upgraded), two stock intercoolers welded together (aka dual IC), front mount IC’s, 600ish CFM intercooler fan (cheap 10hp on stock IC), etc etc etc.

Two places i can think of off of the top of my head are
http://www.supercoupeperformance.com/
http://www.magnumpowers.com/

:update:

This is a comparison between one of the aftermarket blowers offered by magnum powers (no longer their best model, but it serves as a basis of comparison).

The magnum powers blower is much better because they attach a new inlet and matching plenum, better rotors, and port the V opening. You can see how you can sort of do your own mild porting on your blower if you're careful with it.

Thank 8ate8 from SCCOA for pics.
Magnum Powers II blower vs 89-93 style factory M90
http://www.3.8mustang.com/forum/atta...1&d=1138229364
http://www.3.8mustang.com/forum/atta...1&d=1138229364
http://www.3.8mustang.com/forum/atta...1&d=1138229364
http://www.3.8mustang.com/forum/atta...1&d=1138229364
http://www.3.8mustang.com/forum/atta...1&d=1138229364
http://www.3.8mustang.com/forum/atta...1&d=1138229364
http://www.3.8mustang.com/forum/atta...1&d=1138229364

Freebie modifications are great. While you are swapping this whole thing over, it’s very easy to gasket match and port the lower intake manifold (and heads if you want). The plenum can be ported significantly to support a 70mm throttle body. The blower “V” can be expanded a bit to increase flow. Also, the blower’s silencer ports can be welded up, which increases the noise and power.

Where to buy?

Most “complete” supercoupe swap kits are missing at least one or two miscellaneous items. I have seen people offer them anywhere from $250-700 on forums.

The best idea is to buy the whole motor or even the car. I paid $350 for a running supercoupe with high miles (but rebuilt top end and blower, the only thing that matters to me). Ebay and autotrader is the way to do it. One of the benefits of having the entire motor, besides having all the parts on hand, is learning how everything is put together as you take it apart.

Summary: It’s a LOT of work. It takes a LOT of time. It will cost about $1000-1500 if you are running a completely stock mustang with single pipe exhaust. In the end, a relatively stock SC setup can put you into low 14’s with near 100mph traps. A particular individual on this site that is a bit tired of being asked questions did this swap. It’s a single port auto, stock mustang short block, minor V porting on blower- not hard, stock GT exhaust, 2.73 open differential with BEYOND crappy tires. His best time was a 14.3x at 98.x

Those are 99-04 GT times, and he has enormous potential for improvement.

[94blkstang]

good info jayls5 - happy to see a sticky about this topic.


thanks

Rich

[tomzac]

Originally Posted by JayLS5

Also, the blower’s silencer ports can be welded up, which increases the noise and power.

Are those the slots on either side of the V exit port?

EDIT: Is this a stupid question?

[94blkstang]

[quote=tomzac]Are those the slots on either side of the V exit port?
QUOTE]


yes

[95bstallion]

I'm kinda curious where the 1000 dollar number comes from....Tune(chip,flash tuner at minimum, Fuel pump, Gt take offs and the actual supercoupe parts ?
Great write up though!!!!!

[JayLS5]

Originally Posted by 95bstallion

I'm kinda curious where the 1000 dollar number comes from....Tune(chip,flash tuner at minimum, Fuel pump, Gt take offs and the actual supercoupe parts ?
Great write up though!!!!!

It's just a general estimate. Some might be able to pull it off for less, some a bit more.

This is for the bare essentials to get it running. Exhaust, pump, tune, SC parts

Fuel pump is about $100 for a 255 walbro, use stock 30lb SC injectors. Exhaust shouldn't be more than $200 if you go to a mom and pop shop. I used $350 as the basis for the SC parts, since that's what i got the whole car for. Throw in a $400 for Xcal2, some have local tuning shops that can do it cheaper. Add it all together, and it's in that ball park range.

[95bstallion]

I was really just curious for other people that may have questions about the 1,000 dollar tag.

[trevradman]

Great write up! Thanks from us all! Now, lets start a rule where if someone asks a question that is answered in the sticky they get banned.

[Judicator]

Originally Posted by 94blkstang

good info jayls5 - happy to see a sticky about this topic.


thanks

Rich

yes, thank God. and great resource!!!

www.car-part.com is a great place to find motors, parts, etc. in your area!!!

[JayLS5]

Made a minor update on installing it

[JayLS5]

Magnum Powers II blower vs 89-93 style factory M90

[V6mustang94]

How much power to the wheels would you expect if you put the supercharger on, do all the necesities, and do the T-bird heads? All this would be from the 94-95 model and I'd be using my current motor.

[94blkstang]

Originally Posted by JayLS5

The 89-93 models were rated at 210hp/315tq, and the 94-95 were 230hp/330tq.

re read the what jayls5 has written as it is stated

[Duke]

Originally Posted by V6mustang94

How much power to the wheels would you expect if you put the supercharger on, do all the necesities, and do the T-bird heads? All this would be from the 94-95 model and I'd be using my current motor.

supposedly around 200+ whp and 300 wtq

[V6mustang94]

Originally Posted by 94blkstang

re read the what jayls5 has written as it is stated

That's on the T-bird. Not a mustang.

[JayLS5]

Originally Posted by V6mustang94

How much power to the wheels would you expect if you put the supercharger on, do all the necesities, and do the T-bird heads? All this would be from the 94-95 model and I'd be using my current motor.

about ~200whp and ~320tq through an automatic

[V6mustang94]

Originally Posted by JayLS5

about ~200whp and ~320tq through an automatic

How about if I did the whole motor? If I do this I'd much rather put in a whole engine.

[68COUGAR]

Originally Posted by JayLS5

The supercoupes had head gasket problems as well, but this can be attributed to their stock exhaust system. It was terribly designed with a 90 degree bend and poor flowing parts... which netted an end result of 15psi of backpressure.

How did you come up with 15 psi of backpressure? How was it measured? Just Curious.

68COUGAR

[JayLS5]

Originally Posted by 68COUGAR

How did you come up with 15 psi of backpressure? How was it measured? Just Curious.

68COUGAR

Took it straight off of a FAQ on www.sccoa.com

[6forlife]

im doing a whole engine tranny swap and dont know what parts wont match up on my 96 sep an oil lpug and knock sensor. anything im missing??

[94blkstang]

Originally Posted by 6forlife

im doing a whole engine tranny swap and dont know what parts wont match up on my 96 sep an oil lpug and knock sensor. anything im missing??

do not use the tranny from a sc it will not fit with alot of mods and you will be shift really far back.

[1SLOSN95]

Originally Posted by 94blkstang

do not use the tranny from a sc it will not fit with alot of mods and you will be shift really far back.

So what tranny would you use then?

[JayLS5]

Originally Posted by 1SLOSN95

So what tranny would you use then?

The mustang's.

[GakiAkuma]

Great info but what is the best year for the SC?

Wheres the best info for the SC? I may just go with a supercoupe(sc) instead of building a mustang up.

Why make something that already has what your looing for ya know.

[94blkstang]

Originally Posted by GakiAkuma

Great info but what is the best year for the SC?

Wheres the best info for the SC? I may just go with a supercoupe(sc) instead of building a mustang up.

Why make something that already has what your looing for ya know.

imo it's the 94-95 but alot of other ppl like the 89's not sure why? the reason i woudl not do the sc up is because it weights a TON

[JayLS5]

Originally Posted by GakiAkuma

Great info but what is the best year for the SC?

Wheres the best info for the SC? I may just go with a supercoupe(sc) instead of building a mustang up.

Why make something that already has what your looing for ya know.

The 94-95 plenum and blower is better.

The supercoupe weighs about 800 pounds more, and simply throwing a stock SC setup into a mustang will be outrunning some modded supercoupes. Low 14's at around 100mph.

[GakiAkuma]

Yes they do weigh quite a bit, but I see the 2.3t turbocoupe guys making some good numbers with theres, Iam sure I can do alot to drop the weight a good bit, is gonna cost an arm and a leg but I thnk it can be done, becides I play to road race so I think it would be allright

[JayLS5]

Originally Posted by GakiAkuma

Yes they do weigh quite a bit, but I see the 2.3t turbocoupe guys making some good numbers with theres, Iam sure I can do alot to drop the weight a good bit, is gonna cost an arm and a leg but I thnk it can be done, becides I play to road race so I think it would be allright

I'm fairly certain the turbocoupes were lighter. They had a completely different chassis.

The weight of the supercoupe is in the essential parts of the car. The suspension system is heavy, along with every major part. Just swinging the doors on them you realize it's a brick on wheels.

[GakiAkuma]

Yeah when I find one Iam gonna take as much crap out as possable. I like A/C but Iam pritty much used to not having it except in my house.

the spair tire and ect is replaced with a can of fixaflat and a AAA card.

back seat is gone, I like music so I need to keep the radio but replace it with new lighter compnents.I see a couple companies make fiberglass hoods, but no decklids...

Iam sure I could shave 500 lbs off of it and still keep it a comfertable diver.

[JayLS5]

Originally Posted by GakiAkuma

Yeah when I find one Iam gonna take as much crap out as possable. I like A/C but Iam pritty much used to not having it except in my house.

the spair tire and ect is replaced with a can of fixaflat and a AAA card.

back seat is gone, I like music so I need to keep the radio but replace it with new lighter compnents.I see a couple companies make fiberglass hoods, but no decklids...

Iam sure I could shave 500 lbs off of it and still keep it a comfertable diver.

Hah, good luck with that. If your serious about it, the A/C will help a little. The seats are a big one, bunch of motorized parts in there. They were like 60 pounds each. I highly doubt you'll end up cutting 500 pounds though.