Stroker/M90 Supercharger;)

[gbaronetXCR]

That was my bracket you refered to... Sold the blower and bracket a member here.

Just think about how you will feed the intake.
Watch the pulleys, for blet wrap on the blower and clearing the waterpump tube, that's why I used the two pullies on the drop down.
The Xk, is tight under the hood, YJ would be much easier.

Use the main head bolt locations the AC units uses as well.
I might have been overkill on the steel, but did not want the torque to flex it around.
good luck

 

[seanyb505]

yeah I spent a couple night looking at your designs, I dont have a problem using steel, it makes me feel better about the security of the system. Do you know what direction the pulley spins? The belts on the 4.0 go from left to right on top(clockwise), will this turn the blower in the right direction? Ive asked around and researched it but everyone just kinda ignores it. I dont have a problem cutting the hood or buying a hood scoop to make it fit.

 

[fitbmxseries1]

http://www.thirdgen.org/techboard/power-adder/277250-eaton-m90-finally-blowing.htm
not sure if you need to sign up to view that page but this guy put an m90 on an TPI engine and just made some plates and brackets and mounted the supercharger off to the side of the engine.it might help with some ideas. he ahs another page and a video of him drivng it but i cant find any of it.

 

[tealcherokee]

youre going to need 65ish lb injectors to run any decent amount of boost into a stroker at a normal (39psi) amount of fuel pressure, youre also going to need a high volume fuel pump

 

[seanyb505]

A new fuel pump would definately be necessary...

Yes I know I will need a higher volume fuel pump. 65# injectors seems waay to high; the Tbird only runs 30#s. I know my application will be larger by .8 liters, but I dont see how that should double the rate of the injectors. Define decent amount of boost, because I know you're bent on running 15 psi with a turbo. Im not. Ill be happy with 6-7psi.

 

[tealcherokee]

Yes I know I will need a higher volume fuel pump. 65# injectors seems waay to high; the Tbird only runs 30#s. I know my application will be larger by .8 liters, but I dont see how that should double the rate of the injectors. Define decent amount of boost, because I know you're bent on running 15 psi with a turbo. Im not. Ill be happy with 6-7psi.

for the 15psi into my 4.5L im going to need 70lb injectors @39psi.

4.6L stroker 6-7psi atleastt 45lb injectors

 

[Pharaoh XJ]

Does anyone know the forumla to calcute boost or to calculate a supercharger rpm given the engine speed and crankshaft pulley diameter? I know my SC make around 11 psi on the 3.8 V6 it came from, but I think since it was smaller and probly turning higher rpm I wont be getting near that. Id like to know what to plan for.
Thanks in advance!

boost = (pulley ratio x 14.7 x SC displacement / half engine displacement ) - 14.7

in case of an M90 on a stock motor and 6 psi
(ratio x14.7 x 1,484 / 2000) - 14.7 = 6
then ratio of SC pulley to crank pulley = 1.89:1

 

[gbaronetXCR]

The M90's on the 3.8's run 6-8 psi., that's where I grabbed my pulled from, an old Bonni ssei.
The blower producing air spins clockwise.

Using the ford Sc TB intake for the blower. Planned to use the bypass valve by feed it from the boosted side pipe. It would pump boosted air back into the blower reducing belt drag. Search around it's well documented.
The other nice element of this setup, it not needing to run a blow off valve because the TB is on the low pressure side and not running a blow through style, like external SC or turbo's. Keeps it simple.
I talked with a local hotrod shop about injectors. You should look in to a rising rate fuel regulator that would use boost refferance. (4:1) You would be ok with your stroker and larger injectors, but add boost you need to manage the fuel some how. With 6-8 psi the fmu was a decent bandaid. More than that you need serious engine management that would deal with timing, and would want more indicators.
Considering an intercooler when planning your boost exit even with the low boost levels. You might loose up to 1 psi across your intercooler, but increase your Hp by dropping 100-150 degrees in intake tempurture.

My refferance is a friend that put on a vortec SC from a 5.7 TA onto his 928.
http://norcal928.org/DIYSC/
Stock the 928 was seeing a 13.3 at the track at 118, yeah bad 60ft.
After the blower a 12.6, add intercooler 12.1 in mid july.
Have a GTP now, first change this year will be an intercooler.

 

[Pro Stock John]

I'm running 96lb injectors at 45 base fuel pressure to make 867rwhp at 24psi in my 98 Formula turbocharged setup: www.psj.ls1tech.com

I've made 470rwhp with a 422ci + 38 lb injectors at the LS1 base fuel pressure of 57psi.

I don't see why you would need more than 30 - 36 lb injectors to make 350-400 hp.

 

[seanyb505]

boost = (pulley ratio x 14.7 x SC displacement / half engine displacement ) - 14.7

in case of an M90 on a stock motor and 6 psi
(ratio x14.7 x 1,484 / 2000) - 14.7 = 6
then ratio of SC pulley to crank pulley = 1.89:1

I know there are several formulas to calculate boost and other variables. I cant piece together right now the base figures i need to work those formulas. That one works if you know the psi the blower will put out. I was looking for something more along the lines of using engine speed the diameter of various pulleys (crank and blower in particular) to determine how much psi it will run. I know for a fact that Supercoupe owners with boost gauges record about 10-12psi. Smaller engine, higher RPMs. The formula gives a different pulley ratio when you change the boost, is there a way to use the pulley ratio to determine boost? If I could do that I would be able to determine the projected HP and then find out the right size injectors.

 

[tealcherokee]

I'm running 96lb injectors at 45 base fuel pressure to make 867rwhp at 24psi in my 98 Formula turbocharged setup: www.psj.ls1tech.com

I've made 470rwhp with a 422ci + 38 lb injectors at the LS1 base fuel pressure of 57psi.

I don't see why you would need more than 30 - 36 lb injectors to make 350-400 hp.

first of all, can you plug your pics a couple more times, i dont think everyone has seen them.

also, you have 8 injectors, we have 6

 

[Flash]

He is vary proud of his accomplishment just as you will be when you have finish your, and will want to share with any one how would want to.....click and see.

I haven't added any thing to this thread............well because this is over my head, mostly, but vary interesting just the same.

As far as the question that you have ask many time, and every one has avoided........this is my take!

Almost all (all that i now of)of the automotive eng, turn counter clock wise(sitting in the drivers seat.) and the jeep in no exception to the rule!

Now if the SC pulley has groves in the pulley, it will turn in the same direction and the crank. If the SC pulley is smooth(driven by the back side of the belt, it will turn in the opposite direction!

Flash.

 

[seanyb505]

THANK YOU! I have having concerns about how i was going to run the belt around the pulley. I cant actually make brackets for it yet, but Im getting some designs down.

 

[Flash]

THANK YOU! I have having concerns about how i was going to run the belt around the pulley. I cant actually make brackets for it yet, but Im getting some designs down.

:thumbup:

 

[seanyb505]

Ive made some modifications and purchases for my project this week. First off I replaced my 3.07 8.25 with a 3.55 8.25. Best performance result of any mod yet. Today I cut one coil off the front springs, lowering the front about an inch to match the sag in back. While I was at the junkyard getting a new cluster and speedo sensor for the new rear end, I saw the head sitting on the ground, all the dirty work done and ready for the picking. Ive heard that the HO heads have better flow rates though and this one was from a 97. Can anyone verify this, and would it even matter considering any head I get will be ported and polished?

 

[seanyb505]

I haven't added any thing to this thread............well because this is over my head, mostly, but vary interesting just the same.
Flash.

lol Same here! Ive been trying to get my research on and gathering parts before I attempt to put anything together.

 

[Flash]

Ive made some modifications and purchases for my project this week. First off I replaced my 3.07 8.25 with a 3.55 8.25. Best performance result of any mod yet. Today I cut one coil off the front springs, lowering the front about an inch to match the sag in back. While I was at the junkyard getting a new cluster and speedo sensor for the new rear end, I saw the head sitting on the ground, all the dirty work done and ready for the picking. Ive heard that the HO heads have better flow rates though and this one was from a 97. Can anyone verify this, and would it even matter considering any head I get will be ported and polished?

what year of xj is this 97 head going to be on?

Flash.

 

[seanyb505]

Both of the jeep are 97s. It was basically my jeeps twin in the junkyard down to the color.

 

[Flash]

Both of the jeep are 97s. It was basically my jeeps twin in the junkyard down to the color.

sooo you didn't just buy the rear. You bought the hole jeep?


Flash.

 

[seanyb505]

lol no I pulled the rear end, some front body work, gauge cluster, and the speedo sensor gear and the head from it. So basically I bought a lot of it