BBuchta

With so many people asking about M90 superchargers on a Jeep, I figured I would start an interest thread. The M90 would be capable of up to 20psi on the 4.0. I'm considering having a test kit built to try on my jeep, but am curious if anyone would have any interest in purchasing a kit if it went into production. (and what would they be willing to pay for it?) It would install on top of the intake manifold just like the current M62 kit in production and not require removal of the AC system. It could include a water methanol injection system. It would be an experimental kit with no guarantees due to the fact that anything over 8psi can cause reduced engine life. At 12psi the stock head gasket is known to fail. It would have an interchangeable pulley set up to accommodate any range of boost from 5psi and up.

CobraMarty

Great idea.

Using the M90 off the GM 3800 or off the Ford Tbird Super Coupe?

At 5-8 pounds the M62 might make more power with its smaller lighter rotors and more in it's efficiency range. 10+ pounds, M90 all the way.

M90 will need the larger 70mmTB(additional $400) and programmable Meth Injection(additional $400-450) and over 10-12pounds a 2nd additional injector(8th injector) or larger 6 injectors and a way to control/program them. Fuel pump might be the next issue and not be able to supply enough fuel for over 12 pounds boost. Now add a 'boost-a-pump' or larger or 2nd fuel pump(more $). Also MLS head gasket, head bolts and you still have the cast pistons.

All said and done, I think that the M90 kit would be close to $4k and I think that the M62 kit for $2k would sell every time. Not quite 'affordable'. The M90 is more than capable of blowing engines and 1 blown engine will 'kill' the kit.

OK, I said my piece, I look forward to it's progress.

Here is a $5k M90 kit. Click Here.

BBuchta

Yeah I knew about the $5K M90 kit. That's why I was thinking about a M90 kit. I could offer a M90 kit with electronics and injectors for somewhere in the $2500 to $2750 range. It would require investment and testing on my part. I think the M62 kit with a lower price point has more potential for a wider audience. The 6-8 psi that most people want is more easily attainable and affordable with the M62. I haven't yet decided to attempt this project or not. Just fishing for interest.

rav

Love your kit, is there a way you could figure out an intercooler? That would make it quite easy and not have the methanol stuff. I am sure you have thought about it.

BBuchta

If an intercooler was added it would add easily another $1500 and then approach the cost of some of the more expensive kits. On a Cherokee there isn't much room and I wouldn't want to have to lift the supercharger more than it already is, it would stick out of the hood even further with a intercooler sandwiched in between the supercharger and intake manifold. Plus adding another heat exchanger in front of the radiator of a Cherokee would add more heat to a barely adequate cooling system. I've been using methanol now for quite some time, it works great, its cheap, and until the low level light comes on I forget its even there.

CobraMarty

When I had the M62 off, I place a GM3800 M90 without the TB attached and lined up the pulleys and although it is big, it looks like it will physically fit. It is longer and taller and wider but it looks like it will fit in the same location as the M62. The hole in the hood will definitely be bigger. I put a bit more faith into this now.

I will post some pics later.

BBuchta

Yeah it will work with a new upper mounting plate and a custom cut down shortened snout. My other thoughts are the M62 is capable of plenty of boost, last night here it was cold, foggy and rainy. I picked up some extra boost from the denser air and make 9-9.5psi. My A/F ratio was right where I wanted it. So I'm fairly inclined to try a larger TB and intake bracket so see what it does. I decided I don't want to spend all the extra money on mounting an m90 just for a few extra pounds of boost. I think with the right mods the m62 could make more than enough boost. Now my decision is, do I cheap out and just throw on a 2" pulley vs my 2.1" or leave the pulley size alone and spend a lot more money on a custom TB bracket and 70mm TB.

iHenning

The XJ 2.5TD comes with an intercooler, I have one myself, so it should not add too much cost. Its placed under the radiator, gets air trough the front fender.

3278

At those kinds of price points, and that level of risk, for that kind of benefit, I'd rather just swap engines.

PumpinIron

Do you have to cut a larger hole in the hood for the M90?

BBuchta

Yes the M90 would require a slightly larger hole. From the looks of it my hood would not require further modification. Its only about 1/2" larger on each side and I have more room than that in the hole I cut in mine.

CobraMarty

That would be great if it only needed a new upper adapter mounting plate and throttle body adapter plate. It might fit without modifying the S/C snout.