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General Forums => The Mess Hall => Topic started by: rockford on April 03, 2008, 11:25:45 AM
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I am looking to turbo my 2.5 tj with a T3/T4 turbo. I want between 6-7 psi of boost, and i want it to be a fairly simple setup. I know you guys with the YJ's are using 19# injectors and a 12:1 FMU, i am wondering what you guys would suggest for a TJ. I know the stock TJ injectors flow more then YJ ones, so which ones would you suggest, and which FMU should i get. I am looking to get this underway by the end of the month.
Mike
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This will give you an idea of what was used.
http://4bangerjp.com/forums/index.php?topic=3479.0
I'd say 24#'s would be a good place to start.
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Would that and a FMU be good enough for the fuel side of things? would i need an adjustable map sensor?
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Would that and a FMU be good enough for the fuel side of things? would i need an adjustable map sensor?
I think you'd still want Fuel Management.
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what do you mean by that? This is my list sofar
T3/T4 turbo
Intercooler
24# injectors
8:1 FMU
All of the lines and piping
Anything else needed?
Also, would turboing enable me to not regear or atleast change the proper gear ratio if i do decide to do it? Im only running 33" AT's
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I’m running 25lb injectors with a 12:1 FMU, and a stock MAP sensor on my 2.5L YJ with 7 psi boost and its worked great, I have been driving it for about 3 weeks now.
I could be mistaken but the one problem I see with a FMU on the TJ 2.5L is, there is no return line on the TJ engines. I’m just going by the TJ's I have see, like I said I could be mistaken.
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I also heard that TJ's have no return line. That makes adding extra fuel more difficult for sure. There is virtually no aftermarket support for this kind of stuff. Megasquirt is always an option though.
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if i just threw in larger injectors, would that work? Im sort of new to this. what about an adjustable maf sensor? how does megasquirt work?
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I also heard that TJ's have no return line. That makes adding extra fuel more difficult for sure. There is virtually no aftermarket support for this kind of stuff. Megasquirt is always an option though.
Nope, I looked that one up earlier.
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what options do i have here boys?
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I have heard the thought thrown around about using the older injection system off the YJ, so you could use a FMU or other fuel management system.
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I was reading around, and Air Sierra on this board didnt even use any fuel management when he turbo'd his 2.4l. apparantly his computer adapted to the 6lbs of boost he put through it. which is all i am going to be doing. Im assuming that he used stock injectors aswell. I think a T25 turbo with 5-6lbs of boost might function alright with OBD II adjusting the fuel curve.
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Mass air systems are pretty adaptable, but to throw a turbo on a speed density controlled engine with no extra fuel would be very bad. Megasquirt is a stand alone engine control computer. You don't even use the Jeep ECM with it. It is definitely not for noobs though.
Just throwing in larger injectors would make it run way too rich. It probably would not even idle very long.
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You can always bypass the stock fuel pressure regulator in the fuel tank, run a return line to the front and use a YJ fuel rail. It will take a little work adding fittings at the tank end, but it can be done. When I put the 97 Vortec 5.7 in my 80 Chev 4x4 I also had to add an additional line from the 97s vapor cannister to the tank.
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If i were to do that, what kind of injectors would i use? 24# and an 8:1 FMU? seems like an easy enough setup. also where could i find a yj fuel rail? and how would i bypass the pressure regulator, its sort of built into the fuel pump, and the fuel filter. any special tips or guides?
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If i were to do that, what kind of injectors would i use? 24# and an 8:1 FMU? seems like an easy enough setup. also where could i find a yj fuel rail? and how would i bypass the pressure regulator, its sort of built into the fuel pump, and the fuel filter. any special tips or guides?
I got a fuel rail that I could part with; if you are intereseted, send me a PM. It's new, but I cannot say it is in perfect condition (it's not bad, just does not look new even though it suppossedly is).
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i might be interested, but ill know in a week or two.
how much would it cost, on average to get the jeep tuned by a shop?
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Problem solving for the lack of return line?
All 99 up mustangs are have returnless fuel systems. With Supercharged or turbo engines we just put bigger intank fuel pump and larger injectors calibrated with the Mass air flow sensor.
Maybe take that approach.
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Problem solving for the lack of return line?
All 99 up mustangs are have returnless fuel systems. With Supercharged or turbo engines we just put bigger intank fuel pump and larger injectors calibrated with the Mass air flow sensor.
Maybe take that approach.
There's no MAF on the engine though. You'd need a piggyback computer to monitor the flow then.
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im thnking that adding a return fuel line is the way to go. I just want to know how to A) bypass the pressure regulator B) what injectors to use C) what FMU to use.
Mike
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Not sure about the 2.5 but the 4.0s from 96-99 have 23# inj. and 99-01 have 22@ inj., which like Jeffy said, is a pretty good place to start along with an 8:1 FMU. Get the Vortec FMU you can buy recalibration kits for them if the 8:1 is too much or too little. I am experimenting with 25# inj. with a 12:1 FMU and so far its running great. I am taking it on a highway road trip this week and the first mountain I go up has a 6.5% grade for 25mi., should be a good test. As far as bypassing the fuel press. reg. at the tank, the regulator is on the exterior of the tank at the top of the fuel pump module and is removable, the fuel line connects to it. Go to a dealership and see if you can get a complete fuel module that has been replaced, or have a look at a new one to see what you need to do. It has already been done, some turbo guys have used a YJ fuel rail and press. reg. and ran a return line and somewhere I read about someone using the stock fuel rail, adding a press. reg. at the front and running a return line. However they did not elaborate on how they did it.
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So what you are saying is that if i want to run an FMU on my TJ i need to swap my fuel rail from the current TJ one to a older YJ one that has a return line?
Will the YJ fuel rail bolt up without any issues?