jeep 4.0 turbo
#1088787
10/05/11 12:39 PM
10/05/11 12:39 PM
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Joined: Jun 2003
Posts: 4,872
connecticut
pnypwr
OP
master
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OP
master
Joined: Jun 2003
Posts: 4,872
connecticut
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im kicking around turboing a 4.0l out of a cherokee, its going in a gremlin but with the turbo it should be a fun little ride...downside is im turbo stupid so im asking a few questions on where to start...I can weld and fab, im a pro wrench just havnt made any turbo systems...did install a supercharger once but that was a kit. Seeing as there isnt a bolt on kit for a 71 gremlin with a 4.0 l this will be a make it at home deal. any help tips advice direction is appreciated
"Are you gonna bark all day lil doggy? Or are you gonna bite?"
05 ram 2500 ctd
74 gremlin x 360
65 mustang 347
70 coronet R/T 440
03 Mach 1
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Re: jeep 4.0 turbo
[Re: Randy..]
#1088791
10/05/11 02:55 PM
10/05/11 02:55 PM
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Joined: Jun 2003
Posts: 4,872
connecticut
pnypwr
OP
master
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OP
master
Joined: Jun 2003
Posts: 4,872
connecticut
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id like to do it on the cheap running a stock engine, the fab isnt where my quandries lie, more like what size turbo to use...how to compensate for the map sensor and which fmu to run, its a gremlin and i want a fun driver,,,I have a v8 model but I think I should be able to get decent mpg as the cherokees got around 20 and this wigh alot less and has half as much rotating mass...
"Are you gonna bark all day lil doggy? Or are you gonna bite?"
05 ram 2500 ctd
74 gremlin x 360
65 mustang 347
70 coronet R/T 440
03 Mach 1
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Re: jeep 4.0 turbo
[Re: Duner]
#1088796
10/06/11 05:12 PM
10/06/11 05:12 PM
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Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
2734bbl
member
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member
Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
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Duner I know it's all relative but what's a ballpark figure on a build like that?
Can OBDII candle this or is a FMU mandatory?
Last edited by 2734bbl; 10/06/11 05:13 PM.
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Re: jeep 4.0 turbo
[Re: 2734bbl]
#1088797
10/06/11 10:32 PM
10/06/11 10:32 PM
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Joined: Jun 2003
Posts: 4,872
connecticut
pnypwr
OP
master
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OP
master
Joined: Jun 2003
Posts: 4,872
connecticut
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judging by the pcm in that pic its an obd2 truck...my donor is a 94 cherokee 4.0 with 150k on it...for now id like to keep it as stock as possible? Did you just run the factory manifold on the left and pipe it over to the pass side to mount the turbo? I dont plan on running more the 7 or 8 psi I Dont think the engine would take it...not saying in the futurea stroker with forged guts couldnt happen...but hey im playing with gremlins so not like im rolling in the dough right now...
"Are you gonna bark all day lil doggy? Or are you gonna bite?"
05 ram 2500 ctd
74 gremlin x 360
65 mustang 347
70 coronet R/T 440
03 Mach 1
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Re: jeep 4.0 turbo
[Re: Duner]
#1088800
10/07/11 09:58 PM
10/07/11 09:58 PM
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Joined: Jun 2003
Posts: 4,872
connecticut
pnypwr
OP
master
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OP
master
Joined: Jun 2003
Posts: 4,872
connecticut
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what kind of power did you get out of it? do you mind if I pm you and ask some stupid questions...im a turbo novice, but i am a mechanic by trade
"Are you gonna bark all day lil doggy? Or are you gonna bite?"
05 ram 2500 ctd
74 gremlin x 360
65 mustang 347
70 coronet R/T 440
03 Mach 1
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Re: jeep 4.0 turbo
[Re: Duner]
#1088802
10/08/11 12:13 PM
10/08/11 12:13 PM
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Joined: Jun 2003
Posts: 4,872
connecticut
pnypwr
OP
master
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OP
master
Joined: Jun 2003
Posts: 4,872
connecticut
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mybe not if its lifted and has anything bigger than a 31 on it...we lift tons of jeeps and with 33s they are nutless without a regear
"Are you gonna bark all day lil doggy? Or are you gonna bite?"
05 ram 2500 ctd
74 gremlin x 360
65 mustang 347
70 coronet R/T 440
03 Mach 1
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Re: jeep 4.0 turbo
[Re: Duner]
#1088804
10/12/11 11:44 PM
10/12/11 11:44 PM
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Joined: Jan 2008
Posts: 4,254
Canada
WO23Coronet
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master
Joined: Jan 2008
Posts: 4,254
Canada
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Quote:
If you are going to go with a basically stock engine - a T4 with 60-1 HiFi compressor with a .84 AR turbine works very well. A 35mm wastegate is about all you will need. You can also run a cheap Bosch blowoff valve to keep the cost down.
If you run an aux fuel pump inline with a 12:1 FMU it will be just about perfect with the stock injectors as long as you aren't going for more than 7-8 psi of boost. If you plan on upping the boost more than that, then you will need to upsize to 24# injectors and run a 10:1 FMU plate. The MAP sensor will need a checkvalve / bypass to vent boost but close when in vacuum. The power brake boost check valves work well for this. Move the IAT sensor to the air filter in front of the turbo. An intercooler will help it run on 91 octane in warmer weather and is especially important if you want more than 7-8 psi of boost. If you go to higher boost than that, a boost retard on the ignition is recommended.
In your description of what you did to the Jeep, you mention a 12:1 FMU plate and a 10:1 FMU plate used with the aux inline pump, what are these? And from what I understand you didn't need a tuner for the computer, the stock tune would do it? Can you go into this a little more, I'm really enthralled with the turbo stuff and want to build one some day
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Re: jeep 4.0 turbo
[Re: WO23Coronet]
#1088805
10/13/11 11:57 PM
10/13/11 11:57 PM
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Joined: Nov 2003
Posts: 1,969
Chandler, AZ
Duner
top fuel
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top fuel
Joined: Nov 2003
Posts: 1,969
Chandler, AZ
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Quote:
In your description of what you did to the Jeep, you mention a 12:1 FMU plate and a 10:1 FMU plate used with the aux inline pump, what are these? And from what I understand you didn't need a tuner for the computer, the stock tune would do it? Can you go into this a little more, I'm really enthralled with the turbo stuff and want to build one some day
The FMU Explained
An FMU delivers supplemental fuel to the engine when in boost. An FMU is often referred to as a boost-dependent fuel pressure regulator. The FMU is essentially a variable/rising-rate fuel-pressure regulator that automatically raises fuel pressure as boost rises. This is done mechanically without any electronics or programming other than swapping different size plates inside of it to vary the rate.
A booster pump is used in conjunction with the FMU and pumps in a loop. When not in boost, the FMU routes the fuel back into the system instead of to the fuel rails. The FMU is downstream (after) of the stock regulator. As boost pressure begins to rise, the FMU starts restricting the flow of fuel returning to the loop. Like a garden hose, if the flow is restricted, the pressure increases. The increase in restriction results in an increase in the pressure of the fuel being delivered to the factory fuel injectors. Higher fuel rail pressure enables the fuel injectors to deliver more fuel in the same amount of time than they do at the static stock fuel pressure. The limitation to this system is that you cannot continue to raise the fuel pressure beyond reasonable levels. Most people try to keep the fuel pressure below 100 psi. Generally, if you need more pressure than that - you should go to the next larger size injector and lower the rate of the plate.
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