Jeep turbo....FMU or AFC?
 

Im turboing my 95 XJ 4.0 I have been trying to figure out how to get some fuel in it cheaply. SO I bought an FMU, an inline booster pump, a VAFC, 24lbs ford injectors, and a MSD BTM. Im trying to decide on what to run. Im only going to run 8 psi on a T3/T04E .48/.60 ching chong.

1. stock 19 lbs injectors, FMU, pump, and BTM but then I high fuel rail pressure.
2. AFC, some 30+ lbs injectors, and BTM. High ignition timing reguardless.
3. AFC, 24 lbs injectors and the FMU to bump it?

Anyone have any good ideas? This setup may not get intercooled due to lack of room either so the timing thing may be an issue.

Re: Jeep turbo....FMU or AFC?
 

Option # 2 just set the BTM with a steep retard and then carefully play with it.Those are pretty low compression anyways arent they?

Re: Jeep turbo....FMU or AFC?
 

switch to a holley 600cfm x-bore and be golden

Re: Jeep turbo....FMU or AFC?
 

8.8 comp. Its pretty low. The other Jeep guys run no retard with 2 bar map sensors and let the advance fly with no regard. They seem to take it well.

Re: Jeep turbo....FMU or AFC?
 

Is '95 the year Jeep started using crack prone heads or was newer?

Re: Jeep turbo....FMU or AFC?
 

00-01 0331 casting

Re: Jeep turbo....FMU or AFC?
 

get an old amc 258 block and swap a 4.0 head on. low 10's for comp and more hp then the 4.0

Re: Jeep turbo....FMU or AFC?
 

WTF does that have to do with my engine management question? I would build a stroker before doing that.

Re: Jeep turbo....FMU or AFC?
 

bigger stroke

Re: Jeep turbo....FMU or AFC?
 

no, Im talking 4.7 stroker. Hesco head. etc....

Re: Jeep turbo....FMU or AFC?
 

400hp at 66% throttle right?

Re: Jeep turbo....FMU or AFC?
 

I would be asking what kind of transmission should i use that could even handle a cold air intake, then a turbo. Chrysler builds crap especially in the transmission department.

But yeah, run the injectors, AFC, and the BTM. Why do you need a FMU too? BTM's work great on retarding timing. YOu probably don't need the rails unless the injectos don't fit in the stock rails.

Re: Jeep turbo....FMU or AFC?
 

The XJ AW4 is a brick house. Its the most solid part of the truck. They take tons of miles and rediculous abuse. That is the least of my worries. Even if it did ---- the bed they are a dime a dozen and can be had for $100 or less.

Re: Jeep turbo....FMU or AFC?
 

chrysler builds good trannies, but ---- torque converters.

Re: Jeep turbo....FMU or AFC?
 

I have built all of the big 3's trannies and chrysler by far sucks the most. Junk clutches, junk converters, just basically crap designs. I will never own a chrysler product after rebuilding transmissions for 10 years and seeing how they are designed and where they break. BUT WE ALL HAVE OUR EDUCATED OPINIONS! :4

Re: Jeep turbo....FMU or AFC?
 

Funny you think that about the AW4. Our tranny builder thinks they are stout.

Re: Jeep turbo....FMU or AFC?
 

Well if you work at a chrysler dealer or have a biased chrysler trans builder, yeah they are probably stout for a chrysler but they aren't against GM's or Ford's comparable trans. Run that turbo chrysler, im sure it will be fine. ::)

Re: Jeep turbo....FMU or AFC?
 

pre '72 727 or bust

Re: Jeep turbo....FMU or AFC?
 

Not adding anything to this thread, other then CSaddict i see you found your way to pirate4x4. It used to be like HMT, now it is outta control.

Re: Jeep turbo....FMU or AFC?
 

Trust me, HMT is just about there. People are getting fed up with all the assholes and the newb bashing. Take this post for instance. This isnt General Discussion yet 90% of the repsonse have nothing to do with my question.

Re: Jeep turbo....FMU or AFC?
 

I think stock '95 injectors are 21lbs?
Some good info here:http://www.jeep4.0performance.4mg.com/tech_specs.html
I've contemplated a setup like that too, and I think an afc+fmu would work, at least the afc u can add or cut fuel where u want to help fend off pinging.

Re: Jeep turbo....FMU or AFC?
 

Stockers are 19 I think. I am getting some 36#er's this week or next. So it will be 36# injectors, VAFC minus the Vtack, and the BTM. It should work fine.

Re: Jeep turbo....FMU or AFC?
 

sounds like it should work fine as long as your are not running in 100+ temps, at that point it sounds like you will need some timing retard to make it run, at least that is the little bit i have gleaned from doing some reading. Though I think a lot of the problems that the person is having, is that it is running lean in boost.

I think that MS is the way to go though, so you have timing control.

Re: Jeep turbo....FMU or AFC?
 

BTM=Boost timing master. It retards per pound up to 5 degrees per lbs I believe.

Re: Jeep turbo....FMU or AFC?
 

I'm hoping that stuff is all really cheap, the one guy on pirate spent almost as much on an msd timing retard setup as MS would have been.

Re: Jeep turbo....FMU or AFC?
 

My MSD BTM is new in the box= $60
VAFC used from D-series.org=$85
Injectors Im still hunting but figure=$170

The injectors I would need anyway. Its A LOT easier to wire up and AFC and a BTM than to get my jeep running on MS. I would go with a FTC1 split second unit or an AEM FIC before MS.

Re: Jeep turbo....FMU or AFC?
 

yup i would call that cheap.

Re: Jeep turbo....FMU or AFC?
 

Got a reman set of 6 Corvette 36# injectors for $140.99 shipped with a 1 year warranty.

Re: Jeep turbo....FMU or AFC?
 

how much room is there under the hood to fit a turbo?

What sized turbo is gonna be on this beast?

Re: Jeep turbo....FMU or AFC?
 

There is no room for this turbo. That is why no one really does this. It will be 10lbs of ---- in a 5lbs bag. I have seen a few that are setup similar to the way Im going to do itand its supper tight. Everything will need to be wrapped and the turbo will be bagged as well. I think I am also going to move the ECM from the inner fender to the firewall.

The turbo is going to be a Ching Chong T3/TO4E .48/.60 It should be full 8lbs spool under 2k. I mainly just rock crawl with this so Im not concerned with it dying off up top. This truck has never been tached out.

Re: Jeep turbo....FMU or AFC?
 

as you know i am using th booster pump and an fmu for my wrangler, and a check valve between the map sensor. my mileage is actually getting alittle better. im am probably going to get a msd btm just because i here a small amount of pinging going. other than i doubt this motor will ------- blow, these 4.0l are freaking tanks and take one hell of a beating.

Re: Jeep turbo....FMU or AFC?
 

add octane to your tank, stop filling up on 87

Re: Jeep turbo....FMU or AFC?
 

I got the VAFC and the BTM installed and it fired right up after setting up the AFC. Injectors should be here by Friday.

Re: Jeep turbo....FMU or AFC?
 

I'm not sure if u've ever messed with an AFC, but negative settings add fuel correct?

I hope ur gonna put a wideband on it to dial in that AFC....it shouldn't be too bad with the BTM.

Re: Jeep turbo....FMU or AFC?
 

"do you know who I am?"

Re: Jeep turbo....FMU or AFC?
 

Lol.Keep the updates coming im thinking this like most things you touch will come out really nice :6

Re: Jeep turbo....FMU or AFC?
 

Shush, son.



I recommend AFC, BTM, and FMU. Seriously.

FMUs work best when they are low ratio; fuel pressures aren't out of control, so the fuel system can flow more without high pressure loss of efficiency. Large injectors and stock ECU = lololol for off-boost response, so you use the AFC to dial things in.... and dial the big MAP signal deflection timing advance out when you go into boost. At that point the FMU/injector and BTM combo does the work.

PS what style are your injectors? I might be able to find you a deal. Best part is you'd be buying them from a friend, so you don't have to tolerate my shipping baron jr tactics.

Re: Jeep turbo....FMU or AFC?
 

lol

in for updates. you making a build thread or what?

Re: Jeep turbo....FMU or AFC?
 

i use 93 on all my cars. and i think my pinging problem is the fact that my wastegate is 1.4bar and i have an fmu. . i got it under control

Re: Jeep turbo....FMU or AFC?
 

I got some bosch style #36lb units from Southbay Fuel injector. I paid $141 shipped and the guy is in New York and I talked to him on the phone. I still have the FMU but I think it will be benched on this truck. I may use it on my 99 XJ though.