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Jeep Street and Performance Do you like to go fast in your Jeep?

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  #46  
Old April 3rd, 2013, 19:39
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alex22 alex22 is offline
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Re: Performance 4.0 build

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Originally Posted by Talyn View Post
As for the belt, its hard to tell from the pictures, but was only one spot of the belt damaged? From the pic it looks like something stopped the belt from moving while the cranks was still turning. I don't know if that is even possible.
Everything spun fine by hand before I fired it up and the slapping was immediate. Something could have caught for a sec then freed up. I'll bring it by NAPA either way, since I owe my brother a belt now, maybe I'll get lucky and they will call it defective and exchange it.

I left the AC clutch unplugged and the relay was out for a reason when I fired it up for the firs time.

Looks like I have a fuel rail for this weekend!!

~Alex
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  #47  
Old April 13th, 2013, 10:24
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Re: Performance 4.0 build

Real nice job! Any dyne specs yet? Also what do you THINK the specs will be at! H.P & torq.!
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  #48  
Old May 5th, 2013, 21:32
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Re: Performance 4.0 build

So what is the best way to dyno an automatic Jeep?


As in making it stay in one gear with no shifts that is.
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  #49  
Old May 5th, 2013, 22:46
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Re: Performance 4.0 build

My brother brought this home the other day...



About 90K on it, sat for a few years, the plan is to build this similar to the last one I did.
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  #50  
Old May 7th, 2013, 16:57
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Johnnie Walker Johnnie Walker is offline
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Re: Performance 4.0 build

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Originally Posted by sardo_67 View Post
So what is the best way to dyno an automatic Jeep?


As in making it stay in one gear with no shifts that is.
Well, if you disco the TCU whatever position the shifter is in is what gear it is. So, disco TCU and put it in 3. Or setup a manual mode switch.
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  #51  
Old May 7th, 2013, 17:46
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Re: Performance 4.0 build

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Originally Posted by sardo_67 View Post
So what is the best way to dyno an automatic Jeep?


As in making it stay in one gear with no shifts that is.
Last time I checked there was a dyno for engine blocks as well as rolling dyno's for automatics. They even have them for big rigs! Imagine that!
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  #52  
Old May 7th, 2013, 17:56
CobraMarty CobraMarty is offline
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Re: Performance 4.0 build

Montana Fab gear selector but expensive $165, but you could resell it after you are done. I have never tried, but the disconnect the TCU should not work. The trans needs voltage to both A and B solenoids to keep it in 2nd gear. Disconnect will give a CEL and 4th gear- not ideal for a dyno pull.
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  #53  
Old May 7th, 2013, 18:42
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Re: Performance 4.0 build

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Originally Posted by Boss Cherokee View Post
Last time I checked there was a dyno for engine blocks as well as rolling dyno's for automatics. They even have them for big rigs! Imagine that!
If you're referring to an engine dyno, then I would have to take the engine back out of the Jeep, bring it back to the shop where I built it, strip an engine harness out of an XJ, get another flywheel, make the engine mounts and make a merge collector for the exhaust to put it on this.


When I have a Jeep that it can be (and already is) put in and driven onto a chassis dyno a few towns over and run with some a tranny controller.

Marty, If power is put to both solenoids with jumper wires the tranny could be held in gear? The Montana selector does sound like a much nicer way of doing it though.

~Alex
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  #54  
Old May 7th, 2013, 19:54
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Re: Performance 4.0 build

I maybe wrong but my trans stays in low when I put it in low low of both trans cases! So I am assuming that it would stay in 1st gear! Not sure though since I haven't tried it 1st hand on the street! I know assuming may make an ass out of me but I'm still curious!
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  #55  
Old May 7th, 2013, 22:44
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Re: Performance 4.0 build

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Originally Posted by Boss Cherokee View Post
I maybe wrong but my trans stays in low when I put it in low low of both trans cases! So I am assuming that it would stay in 1st gear! Not sure though since I haven't tried it 1st hand on the street! I know assuming may make an ass out of me but I'm still curious!
when doing a Dyno pull you want the gear to be a 1 to 1 ratio, so 1 revolution of the motor is 1 revolution of the tire. i dyno my car in 4th gear as it is a .998 gear a believe or just below 1:1.

i know people on here make their own tranny controlers for just a few bucks at the local RadioShack or Autozone. i do not see why unplugging the TCU would not work as there is still a cable and lever that puts the tranny into X gear. i'll be making my jeep into a "manual" auto soon so we can play around with that. i'm sure the guys at the dyno shop have dealt with issues like this before.
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  #56  
Old May 8th, 2013, 13:00
Talyn Talyn is offline
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Re: Performance 4.0 build

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Originally Posted by Boss Cherokee View Post
I maybe wrong but my trans stays in low when I put it in low low of both trans cases! So I am assuming that it would stay in 1st gear! Not sure though since I haven't tried it 1st hand on the street! I know assuming may make an ass out of me but I'm still curious!
If you are in low range on the TC and 1-2 on the Aw4, once you rev out in first it will shift to second. That is if you are going fast enough.
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  #57  
Old May 8th, 2013, 17:31
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Re: Performance 4.0 build

Yeah I'm sure it is doing that I just never seem to go fast enough for it to shift!
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  #58  
Old June 10th, 2013, 00:42
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Re: Performance 4.0 build

http://www.ebay.com/itm/JEEP-XJ-Cher... c37f&vxp=mtr

found those on ebay as well. i just searched "2001 Cherokee radiator mount"
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  #59  
Old July 14th, 2013, 21:35
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Re: Performance 4.0 build

also if you disconnect the tcm you go into open loop and run like crap.
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  #60  
Old July 15th, 2013, 16:41
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Re: Performance 4.0 build

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Originally Posted by rmx250cfl View Post
also if you disconnect the tcm you go into open loop and run like crap.
I don't think your TCM controls the engine to be able to make it run like crap if not plugged in.
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