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Old 01-18-2017, 04:39 PM
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4.0 supercharger help

Hey guys I new here... I have a 2006 LJ and was recently given a supercharger kit for it? I don't know anything about the kit, I don't know who makes it or made it Hell I don't even know if I have everything. Any help from you guys would be very helpful and appreciated.

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Old 01-18-2017, 05:01 PM   #2
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Give it back, wrangler drivetrains are not built for the extra power/torque. Your only asking for more problems down the road. Need more power but a corvette.

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Old 01-18-2017, 06:42 PM
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Lol I love when people tell me not to do something. I'll post the dyno sheets when I'm done. Going fast isn't the objective here. Also, you're*
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Old 01-18-2017, 07:45 PM   #4
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The guys over at jeep strokers might recognize it - they are always pushing their 4.0 liters. Did they provide bigger injectors or any fuel management ... that is the difficult part to forced induction. I have not done a jeep - but have installed turobs and s/c's on cars in the 90's and 2000's. I became a pretty good tuner, after quite a few hours on a dyno with software. And did blow one engine - but I was running very high boost - 15 psi, and trying to get the max hp for a competition.

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Old 01-18-2017, 08:19 PM   #5
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Lol I love when people tell me not to do something. I'll post the dyno sheets when I'm done. Going fast isn't the objective here. Also, you're*
You'll end up posting pictures of a blown motor before you get a chance to do those dyno runs that very few people care about around here. Wrong Vehicle & definitely the wrong motor.
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Old 01-18-2017, 09:23 PM
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Lol I love when people tell me not to do something. I'll post the dyno sheets when I'm done. Going fast isn't the objective here. Also, you're*
You'll end up posting pictures of a blown motor before you get a chance to do those dyno runs that very few people care about around here. Wrong Vehicle & definitely the wrong motor.

Motors are electric and I wasn't looking for opinions I was looking for help but it seems most people on here have more opinions than helpful knowledge.
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Old 01-18-2017, 09:24 PM
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The guys over at jeep strokers might recognize it - they are always pushing their 4.0 liters. Did they provide bigger injectors or any fuel management ... that is the difficult part to forced induction. I have not done a jeep - but have installed turobs and s/c's on cars in the 90's and 2000's. I became a pretty good tuner, after quite a few hours on a dyno with software. And did blow one engine - but I was running very high boost - 15 psi, and trying to get the max hp for a competition.

https://www.jeepstrokers.com/forum/
Thank you.
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Old 01-19-2017, 07:15 AM   #8
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I wasn't looking for opinions I was looking for help but it seems most people on here have more opinions than helpful knowledge.
That is a true statement.
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Old 01-19-2017, 07:42 AM   #9
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There is a good Jeep customizing shop down near Doylestown PA called Jeff Daniels. He may be a good place to start or he may be able to recommend a shop closer to you that can help you out with this or get your the info you need in order to make an informed decision on if you should install this or just pass it along.
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Old 01-19-2017, 08:40 AM   #10
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You will NOT blow up your Jeep 4.0L engine with a supercharger.
Your Wrangler drivetrain WILL handle the extra power and NOT break.

I have been running superchargers on the 4.0L for several years now. Over 150 kits and no failures. Installation errors, other mechanical problems but no failures due to the supercharger kit. 6 pounds of boost is 'Jeep' reliable.

What you have there is an old 'Rimmer' kit with a Ford M90 SC off of the Ford Tbird Supercoupe. Nothing wrong with the 'Hardware' like you have.
The problem is the Tuning. Some kits used stock injectors and a booster fuel pump and a rising rate FMU. Others used larger injectors and a Split Second FTC1 controller.

Any tuning solution MUST have timing retard under boost and more fuel during boost.

If you have NO Tuning solution, you will blow the engine.
Properly tuned, you can run 6-10 pounds of boost reliably.

Also, tuning on the '05-'06 requires special attention or it won't work right.

Only listen to someone who has a supercharged Jeep 4.0L, everyone else is just a 'internet wantabe' with NO real world experience in supercharging the Jeep 4.0L.
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Old 01-19-2017, 08:47 AM   #11
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It looks like it has injectors in the pics, they should be the injectors that were run on the supercharger last. Have you tried to look up any part numbers that are on it? That might be a good starting point to get any info on it. That way you might be able to find out some details on it. Finding out who makes it would make installing it a lot easier to install.
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Old 01-19-2017, 10:25 AM
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Originally Posted by CobraMarty View Post
You will NOT blow up your Jeep 4.0L engine with a supercharger.
Your Wrangler drivetrain WILL handle the extra power and NOT break.

I have been running superchargers on the 4.0L for several years now. Over 150 kits and no failures. Installation errors, other mechanical problems but no failures due to the supercharger kit. 6 pounds of boost is 'Jeep' reliable.

What you have there is an old 'Rimmer' kit with a Ford M90 SC off of the Ford Tbird Supercoupe. Nothing wrong with the 'Hardware' like you have.
The problem is the Tuning. Some kits used stock injectors and a booster fuel pump and a rising rate FMU. Others used larger injectors and a Split Second FTC1 controller.

Any tuning solution MUST have timing retard under boost and more fuel during boost.

If you have NO Tuning solution, you will blow the engine.
Properly tuned, you can run 6-10 pounds of boost reliably.

Also, tuning on the '05-'06 requires special attention or it won't work right.

Only listen to someone who has a supercharged Jeep 4.0L, everyone else is just a 'internet wantabe' with NO real world experience in supercharging the Jeep 4.0L.
Thank you very much. The kit I have came with bigger injectors. I have already talked to a dyno tech near me and he is excited to put it on their all wheel dyno and tune it for me. My little brother has a 9lb supercharger on his stock 91 S10 and after tuning the thing runs great. I didn't figure a vehicle 14 years newer would have a problem handling 6lbs.
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Old 01-19-2017, 11:07 AM   #13
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Do you know if was it pulled from another TJ 4.0L motor?
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Old 01-19-2017, 11:25 AM   #14
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That kit was made for and fits the 4.0L engine.

Check the numbers on the injectors and post them here.
You need to know what they are, lb/hr. Don't believe what you were told. You must check it for yourself.

And your dyno tech guy most likely will not be able to 'tune' the stock ecu.
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Old 01-19-2017, 04:02 PM
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Do you know if was it pulled from another TJ 4.0L motor?
Yes it was. I will get numbers off my injectors next time I'm at the shop. I spent the whole day repairing the captive nuts to hold the skid plate on. Apparently the last guy that owned it broke the bolts off and thought self tapping screws were sufficient.
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Old 01-19-2017, 04:24 PM
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Here's a pic of the injectors. They all also say PA 98 CA
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Old 01-19-2017, 04:39 PM
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Says they are 22.5/hr injectors.
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Old 01-19-2017, 05:05 PM   #18
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Those sound like stock size injectors.

Fuel Injectors:
Model Year, ...Part #, ......Color, .....Fuel Pressure, ...Static Flow,
'87-'90, ........53003956, ...Dark Tan, ...39psi, .................18.6lb/hr
'91-'93, ........33007127, ...Brown, .......39psi, .................21.0lb/hr
'94-'95, ........53030343, ...Tan, ............39psi, .................21.0lb/hr
'96-'99, ........53030778, ...Grey, ..........49psi, .................23.2lb/hr
'99-'01, ........04854181, ..Blue tip, .....49psi, .................22.5lb/hr

'96-'98..........703s 4 hole...EV1............49psi...................24.1 lb/hr..........21.5 @ 39psi
'99+..............784s 4 hole...EV6............49psi...................24.0 lb/hr
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Old 01-19-2017, 07:01 PM   #19
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Ah- things are getting a little more informative and interesting. If it is a M90 - then it is an Eaton S/C I believe. I had an M45 on a Miata once. Great effeciency at 4-6 psi and ran well without an intercooler at that boost. Kind of wish I did not take it off and go crazy on the more power quest LOL.

Looks like Cobra Marty understands this system. Is there an extra injector ( 7th ) - and do you have it. If those are stock injectors - I hope so. Sounds like you will need some sort of tuning solution - split second has a reasonable reputation and if you can find a base program for the 4.0, all that much better, as then you just need to tweak. Your dyno guy could tune if there is tuning software involved and he has it/has used it. As mentioned - the timing and fuel curve under boost needs to be developed ... not just for your engine, but also any mods you might have ( from cold air induction to a more free flowing exhaust ).
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Old 01-19-2017, 09:05 PM
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Ah- things are getting a little more informative and interesting. If it is a M90 - then it is an Eaton S/C I believe. I had an M45 on a Miata once. Great effeciency at 4-6 psi and ran well without an intercooler at that boost. Kind of wish I did not take it off and go crazy on the more power quest LOL.

Looks like Cobra Marty understands this system. Is there an extra injector ( 7th ) - and do you have it. If those are stock injectors - I hope so. Sounds like you will need some sort of tuning solution - split second has a reasonable reputation and if you can find a base program for the 4.0, all that much better, as then you just need to tweak. Your dyno guy could tune if there is tuning software involved and he has it/has used it. As mentioned - the timing and fuel curve under boost needs to be developed ... not just for your engine, but also any mods you might have ( from cold air induction to a more free flowing exhaust ).
From the sounds of it they are stock earlier 4.0 injectors. I will be replacing them with bigger ones because we all know lean is mean but it doesn't last long. The guy I spoke to about tuning it is very confident in his abilities to remap and time. I've got no problem with buying any additional boxes or electronics that he will need to make it work properly as I'm not looking for a race car I just want something different that will last.
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Old 01-19-2017, 09:07 PM
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I've got a cold air intake for it as well and I have ordered a new header and will be custom building mandrel bent 2 1/2 inch single exhaust for it.
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Old 01-19-2017, 09:09 PM
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I also got this cam in the mail today.
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Old 01-19-2017, 09:12 PM
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Howards cam
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Old 01-20-2017, 09:32 AM   #24
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I'd leave the stock cam in.

With a new cam, needs new lifters and maybe new proper length pushrods. And then there is valve springs.

Too many changes at once. Too many things to go wrong or have a problem with. SC, bigger injectors, tuning, cam, ...

But that's just me.
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Old 01-20-2017, 09:48 AM   #25
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Yeah -I'd second that, as you are not sure what specs are needed to increase the S/C performance vs hinder it ( timing duration etc .... ). Something for phase 2 if you like always tinkering. On the injectors - if an extra one is added, you might want to stick with the stock size. Again - not sure what the design/specs are for this system and how much more fuel is needed.
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Old 01-20-2017, 01:23 PM   #26
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That is exactly right. You need about 180-190 lb/hr of fuel under boost 5-6 pounds.
Either 6x22lb/hr +60lb/hr or 6x30lb/hr.

We use the 6 stock size injectors or the 'upgrade' 703 4 hole injectors and then use a 60lb/hr 7th injector to add the fuel needed under boost. We feed it directly into the SC where it gets 'homogenized' and well mixed with the air and also helps cool the air and acts as a 'liquid/chemical' intercooler to keep charge intake air temps in check. This 7th injector is controlled by it's own controller which also retards the timing when in boost. The beauty of this method is when out of boost, all is stock. Idle, cold start, cruising, etc. Only in boost does the controller come online and pulse the 7th injector and retard the timing according to rpm and boost. This way is easier, simpler and cheaper.

The other way is to dump the 6 stock injectors and use 6 30lb/hr injectors in their place. Here you have to 'tune' them down for idle, cold start, etc otherwise they will run too rich. Plus you need to retard the timing when under boost and you lose the intercooling effect of the 7th injector. There is no room for an intercooler and without one your charge intake air temps will be 250*F+ and risk detonation and KABOOM. Sure you can run Meth injection but that is something else and more money.

Years ago and with your setup when it first came out they just used the stock injectors, added a 2nd booster fuel pump and a FMU rising rate fuel pressure regulator to like 70 psi when under boost so the stock injectors would flow enough fuel. That system didn't work. Poor drivability, blown engines, many failures.
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Old 01-20-2017, 04:49 PM   #27
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The 7th injector can be mounted after the throttle body and before the supercharger in a location that fits and clears surrounding bits. It will spray fuel into the supercharger inlet. You will need to make some kind of injector holder. round base for the injector to slip into and a hat to go on top of the injector to attach a fuel line and a bracket to hold the injector in place. You will then need to 'T' into the stock fuel line so you can supply fuel to the 7th injector.

This 7th injector can be controlled by a Split Second FTC1 Controller (Fuel Timing Controller). See their site. It will take care of the fuel and the timing retard when in boost, all in one box.
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1998 XJ 2D lifted 35s BoostedTech M90 Supercharger 220rwhp 6-7 pounds boost
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Old 01-20-2017, 04:50 PM   #28
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1998 XJ 2D lifted 35s BoostedTech M90 Supercharger 220rwhp 6-7 pounds boost
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Old 01-20-2017, 04:51 PM   #29
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1999 XJ 2D lowered 2wd 'RaceJeep' M62 supercharger 210rwHP 6 pounds boost
1998 XJ 2D lifted 35s BoostedTech M90 Supercharger 220rwhp 6-7 pounds boost
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Old 01-20-2017, 04:53 PM   #30
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Check out my build thread and a similar SC install.
Project: #becauseracejeep - Jeep Cherokee Forum
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1998 XJ 2D lifted 35s BoostedTech M90 Supercharger 220rwhp 6-7 pounds boost
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