ok well heres the story, i was forced to rebuild my 2005 4.0 when i hydrolocked it, 1/8" mud on top of each piston. i rebuilt it and it runs great i couldent be happier. but i know to unleash the full potential of my stroker the computer needs a tune, i just know the computer is freaking out and has no idea what is going on. so my question is where can i send the computer to get it tuned. i have all the specs on it for it to be tuned i just need some companies.

We Have Several Guys We Use. I'll Call Around And See What I Can Find Out For You.

Josh At High Horse Performance May Be Able To Help.

best thing to get is a unichip from hesco it is custom programed for stroker motors or whatever else you have done to the motor. www.hesco.com

best thing to get is a unichip from hesco it is custom programed for stroker motors or whatever else you have done to the motor. www.hesco.com


i think you mean http://www.hesco.us/

thx i sent the guys at hesco an email.

x3 on Hesco. Best choice.

Goto the stroker forum, they have all kinds of info, first off you dont need to do dick with the computer, you need the correct injectors/fuel pressure, and maybe an adjustable map sensor. This mod works best with a high flow exhaust header/cat/2.5" catback system and good air intake. I am running a 4.7 in my cj, its getting swapped into my wrangler this summer. tim
[url]http://www.jeepstrokers.com/

i checked the stroker fourm befor posting up here, there was lots of good info but nothing on the computer. i have a cat back system and cold air intake. you are exactly right on what i need to do, but being an OBDII vehicle i can not just throw in biger injectors and fuel pump because the computer still wants the same air/fuel ratio as a 4.0. this is why i need some one to test my jeep on a dyno and and see where in the rpm range it is rich/lean and then with bigger injectors they can make a chip to corect the ratio.

Actually your computer won't know that it has bigger injectors. It wil still be looking for the same air:fuel ratio which is what actually makes this all work. The larger injectors inject more fuel for the added air due to displacement.

ok i think i get this now, all this computer crap is too confusing for me:confused: so what injectors would i need. also i still think it would be a good idea to have it tested on a dyno just to make shure it is corect. if anyone knows of a company in the denver metro area that can do this please let me know.

I have a Hesco stroker and the unichip Hesco supplies with it. The chip is plug-and-play and plugs into your stock CPU plug, then you plug the whole thing right back into the computer. The chip comes with a selector toggle to select one of two timing settings and even a neat finger ratchet tool for the center bolt holding the wire harness plug. Couldnt be any easier.

At Hesco work with Bennie Fulps.


x3 on Hesco. Best choice.

wow thanks for all the help i searched for a long time with little results befor posting here

so what injectors would i need ?

24's are what you need, Hesco sells them on-line.

Most people run the Ford motorsport 24# injectors or mopar 24#, adjustable map sensor....Its on the stroker forum...do some diggin. The computer is looking for a balance of fuel and air, with the larger displacement you need more fuel which = larger injectors. the adjustable map sensor will allow for fine tuning. Tim

Look at http://www.fiveomotorsport.com/Injector_Sets.html

... adjustable MAP sensor is interesting, didnt know that. I bought the MAp sensor Im running from Hesco so maybe they set it up to work with the 24# injectors...

one mor question? for those of you who have stroker motors, with a computer, are you having any trouble code pop up? i have a rich/lean code coming from the O2 sensors i asume it is due to the stock injectors, i hope it will go away when i get a chip and bigger injectors but im not shure.

one mor question? for those of you who have stroker motors, with a computer, are you having any trouble code pop up? i have a rich/lean code coming from the O2 sensors i asume it is due to the stock injectors, i hope it will go away when i get a chip and bigger injectors but im not shure.

I had my share of codes but never that one, I guess because Ive always had 24# injectors in the motor

just ordered my unichip for my 4.6L stroker for my 1994 Jeep yj i will let you know how it is. I ordered it from Hesco as well

good deal, look forward to hearing how it turns out. it'll only take you 30 minutes to install, piece of cake.

just ordered my unichip for my 4.6L stroker for my 1994 Jeep yj i will let you know how it is. I ordered it from Hesco as well

im gona get a chip and biger injector, but im gona have to wait tell after the holidays. when i get them ill let you all know haw they do

This was about the best thread I could find with the search resource that dealt with computer questions and strokers.

I am about to drop a 4.6L in my 1992 XJ and cant find any info on what computer and/or sensor mods I need to do. Unichip does not make a product for anything pre 93 computers. Can some on steer me in the right direction???

This was about the best thread I could find with the search resource that dealt with computer questions and strokers.

I am about to drop a 4.6L in my 1992 XJ and cant find any info on what computer and/or sensor mods I need to do. Unichip does not make a product for anything pre 93 computers. Can some on steer me in the right direction???

Ok, for ODB1 you do not need to do anything with the ECM.

Just run 24lb injectors, and if necessary, an adjustable MAP.

ODB1 is dead simple to tune. The problem comes in with ODB2 Jeeps.

How did the unichip work out? Did you also get the injectors? Tim

Ok, for ODB1 you do not need to do anything with the ECM.

Just run 24lb injectors, and if necessary, an adjustable MAP.

ODB1 is dead simple to tune. The problem comes in with ODB2 Jeeps.

Tits! That was what I was hoping to hear! I have read where some people run 27# injectors. Is that just overkill?

Tits! That was what I was hoping to hear! I have read where some people run 27# injectors. Is that just overkill?

Ok, we are talking ODB1 here.

27lb injectors would be fine - especially if your engine was built to that level of volumetric efficiency.

A fairly standard, rebuilt 4.0L with a 258 crank would be fine with 24's.

I would reserve the 27's for strokers that are blueprinted, ported, etc etc.

The trick is to keep yourself pretty much in the middle of your injector pulsewidth. Too big of an injector and it can't idle due to excessive fuel. Too small and it runs wide open (hard on it) under WOT conditions.

ODB1 is dead simple to tune. The problem comes in with ODB2 Jeeps.

X2. I get alot of misfire codes with my Unichip and max timing on my 01 motor so I tend to run with a conservative tune. Still way better than using the stock ECU on its own though.

Ok, we are talking ODB1 here.

27lb injectors would be fine - especially if your engine was built to that level of volumetric efficiency.

A fairly standard, rebuilt 4.0L with a 258 crank would be fine with 24's.

I would reserve the 27's for strokers that are blueprinted, ported, etc etc.

The trick is to keep yourself pretty much in the middle of your injector pulsewidth. Too big of an injector and it can't idle due to excessive fuel. Too small and it runs wide open (hard on it) under WOT conditions.

I agree, I would definatly say 27's are to big for a normal 4.5-4.7 liter stroker. Even if you where doing a 5.0 stroker, 26's should be plenty. 24 pounders, Hesco adjustable FPR and your good for normal use. If you want, get with Split second, and a wide band O-2 to get further into programming fuel curves at any rpm under any load. But thats only if your trying to squeeze as much as you can with what you have.

But if you want to know, Im running 30's in my system(turbo charged 4.0) and I can idle/crawl on the trail with zero issues. It behaves like nothing has been changed.

Injector pulse width should be between 70-85%, but never more then 90% or you might run into injector failer(stuck closed or open=not good).

Good shit guys, thanks...

I agree, I would definatly say 27's are to big for a normal 4.5-4.7 liter stroker. Even if you where doing a 5.0 stroker, 26's should be plenty. 24 pounders, Hesco adjustable FPR and your good for normal use. If you want, get with Split second, and a wide band O-2 to get further into programming fuel curves at any rpm under any load. But thats only if your trying to squeeze as much as you can with what you have.

But if you want to know, Im running 30's in my system(turbo charged 4.0) and I can idle/crawl on the trail with zero issues. It behaves like nothing has been changed.

Injector pulse width should be between 70-85%, but never more then 90% or you might run into injector failer(stuck closed or open=not good).

I'm still looking for a scan-tool that will allow me to monitor injector pulse width, and real-time sensor data flow on ODB1 - for a reasonable $$$.

Just thought I'd throw that out there.

ok i dont know if anyone cares? but here is an update. so i decided against geting a programer. what i did was upgrade to bigger 24lb ford injectors, and i got to say it runs awsome! all my little motor glitches are gone. my rpms are around 400 less when driving the same speed as before, so my engine isn't working as hard. gas mileage is 7 city and 14 highway running 87 octane, thank god this isn't my DD. i gota say thank you to all of those who helped me on this. i am so glad it runs like i knew it could!

Austin