[cruizer]

I have a 98 GT. I just bought the stuff for a PI swap, haven't installed yet, and I heard about putting the eaton m90 supercharger from a supercoupe on for big gains. I would like to use the PI heads and cams and get a different intake so the supercharger will fit. The PI heads will increase the compression to 10:1 but I was told there was a chunk of metal on the heads near the name tag or numbers or something??? that you can grind off to lower it to about 9.5:1. I was told this was just there for efficiency but if I go forced induction it won't matter to get rid of it. Has anybody heard of this? I could find out more information about it if necessary. I was also told I would be able to run 6 to 7 lbs of boost on the stock internals with no problems.

My main question is what intake manifold to use. I know this is usually just done to the v6's but I've found several references to doing it on the GTs, but not enough information. I've heard that you could use a saleen or roush intake manifold and it would bolt right up and still fit under the hood. Supposedly the saleen intake manifold is a little more restrictive so you don't get as much power. My question is where would you even find these, if there are other intake manifolds you can use, and if anybody can confirm this information? Also there is an Allen kit that runs about 4k that uses the m90 but you can buy a m90 off ebay for between 200 and 400 and if I could find the intake, I think I can get it all for under 1k. Also does anybody know of any other parts I would need? just a throttle body maybe???

[Drtbkercr5]

I always wondered about this...this should be interesting. Im not sure at all.

[fsttang96]

Originally Posted by cruizer I have a 98 GT. I just bought the stuff for a PI swap, haven't installed yet, and I heard about putting the eaton m90 supercharger from a supercoupe on for big gains. I would like to use the PI heads and cams and get a different intake so the supercharger will fit. The PI heads will increase the compression to 10:1 but I was told there was a chunk of metal on the heads near the name tag or numbers or something??? that you can grind off to lower it to about 9.5:1. I was told this was just there for efficiency but if I go forced induction it won't matter to get rid of it. Has anybody heard of this? I could find out more information about it if necessary. I was also told I would be able to run 6 to 7 lbs of boost on the stock internals with no problems. My main question is what intake manifold to use. I know this is usually just done to the v6's but I've found several references to doing it on the GTs, but not enough information. I've heard that you could use a saleen or roush intake manifold and it would bolt right up and still fit under the hood. Supposedly the saleen intake manifold is a little more restrictive so you don't get as much power. My question is where would you even find these, if there are other intake manifolds you can use, and if anybody can confirm this information? Also there is an Allen kit that runs about 4k that uses the m90 but you can buy a m90 off ebay for between 200 and 400 and if I could find the intake, I think I can get it all for under 1k. Also does anybody know of any other parts I would need? just a throttle body maybe???

I was told that just by grinding that off it will increase the cc's in the heads only by 2cc's making the PI heads 45 cc's I dont think it will be enough to drop the compression down to 9.5:1 I heard it only drops it down .2 ! The stock NPI heads are 52 cc's and I think the stock compression on the NPI motors is 9.3:1 !! I was going to put PI heads on mine and most everyone I talked to said that they would NOT put Pi heads on and run a Supercharger without putting in different pistons !

[Redux]

Originally Posted by cruizer Also there is an Allen kit that runs about 4k that uses the m90 but you can buy a m90 off ebay for between 200 and 400 and if I could find the intake, I think I can get it all for under 1k. Also does anybody know of any other parts I would need? just a throttle body maybe???

I have a, as close to, full kit for sale right now. All you would need to buy after the kit would be a fuel pump, and timing cover. I have everything else, fuel injectors, alt., belts, intake, etc...

http://www.moddedmustangs.com/forums...arger-kit.html

[Redux]

And by kit I meant for a V6.

[cruizer]

I'm looking for a v8. And yeah that's why I waited and haven't put on the pi heads yet. But I have to wonder that the 99 - 04 guys put superchargers on their mustangs right? How do they do it? Is it not on a stock head or do they have to go with forged internals to supercharge? A thicker head gasket would only lower the compression by about .1 would it. Would it be worth it because you blow the thicker head gaskets easier right?

[fsttang96]

Originally Posted by cruizer I'm looking for a v8. And yeah that's why I waited and haven't put on the pi heads yet. But I have to wonder that the 99 - 04 guys put superchargers on their mustangs right? How do they do it? Is it not on a stock head or do they have to go with forged internals to supercharge? A thicker head gasket would only lower the compression by about .1 would it. Would it be worth it because you blow the thicker head gaskets easier right?

The 99 -04 mustangs have a dish type piston which with the smaller combustion chambers on the head bring there compression down to ( I think ) 9.5 or so. On 96 - 98 they had what they call a flat top piston that is why the compression goes up to 10.1 when putting on the PI heads! There are ways to get around the compression thing like thicker gaskets but its to my understanding that if you drive the car alot and want it to be reliable and not air condition the block it not a good idea unless you spend some money and do it right by changing the pistons

[330CubeGt]

Look for a 99-04 Saleen Lower The blown Saleens Came with M90's.

Seen a Damn Near complete Setup on Ebay about a month ago.

[ndfrspd]

v6 is for pussies.

[Drtbkercr5]

Originally Posted by 330CubeGt Look for a 99-04 Saleen Lower The blown Saleens Came with M90's. Seen a Damn Near complete Setup on Ebay about a month ago.

What if you didnt want to switch to PI Heads? Would you look for a 96-98 Saleen lower? Or is that just not possible?

[MikeD05GT]

Originally Posted by ndfrspd v6 is for pussies.

thanks for the wonderful advice jackass...

ive always heard that the m90 swap is more trouble than it is worth...

not saying not to try it..or that that is my opinion...but if you can find all the stuff for cheap...go ahead!!

[97S281]

Originally Posted by Drtbkercr5 What if you didnt want to switch to PI Heads? Would you look for a 96-98 Saleen lower? Or is that just not possible?

The supercharged 96-98 Saleens used centri's, They didn't start using a roots type until 99.

Ford Motorsport SVO did make a roots type blower for the 96-98 npi motor. They are VERY hard to find but can usually be picked up used for less than 2k. Iv'e been looking for one for a couple years now and have only come across three. Only 2 of those were for sale and one of those required you to buy the complete engine to get it.

[cruizer]

Originally Posted by jlaw98gt ive always heard that the m90 swap is more trouble than it is worth... not saying not to try it..or that that is my opinion...but if you can find all the stuff for cheap...go ahead!!

The Allen kit claims 100+ hp increase on only 6psi and they use a m90. So in my opinion that's good enough gains for the trouble especially when if I can find an intake I think I can get all the parts off of ebay for under 1k compared to all the other supercharger kits that are upwards of 4k

Here is the link for the allen kit: Allen Supercharger Kit w/Integrated Intercooler for 1998 Ford Mustang GT w/4.6L (6psi)

[Drtbkercr5]

Originally Posted by 97S281 The supercharged 96-98 Saleens used centri's, They didn't start using a roots type until 99. Ford Motorsport SVO did make a roots type blower for the 96-98 npi motor. They are VERY hard to find but can usually be picked up used for less than 2k. Iv'e been looking for one for a couple years now and have only come across three. Only 2 of those were for sale and one of those required you to buy the complete engine to get it.

Thanks for the good info. I dont have the time nor patience to sit and look for an SVO blower. lol

[330CubeGt]

The guys car went 13.8. with a M90.My Car was 13.8s all day With a stock N/A 4.6 With Gears,CAI,M/Ts

If i Did not go atleast 12s With Some Sort of Power Adder i would be disappointed.

[MikeD05GT]

Originally Posted by 330CubeGt The guys car went 13.8. with a M90.My Car was 13.8s all day With a stock N/A 4.6 With Gears,CAI,M/Ts If i Did not go atleast 12s With Some Sort of Power Adder i would be disappointed.

+1 i feel the same exact way

[330CubeGt]

I know a guy that has a Saleen Vert i belive its a 00.He hates the M90 on his hes pushing 12PSI and i have seen him get beat by a stock 350Z and a 00Gt with Exhaust.Car Looks Sexy as hell and soungs great but he seems to be disappointed with it and wants to make it faster but the M90 is not enuff.