512tr

Will this help

Check out this page, think its Russian :wrench: http://forceauto.ru/_pages/chrysler/index.php

87manche, No I haven’t, the reason I tested the HO injectors was that I did have them in my garage. Have never used an adjustable MAP sensor, but as I understand I could have used one if the engine has been running lean with the stock injectors, and rich with the HO injectors. Then an adjustable MAP sensor may have been the solution to trim down the injectors bandwidth with the HO injectors or trim up the bandwidth with the stock injectors.

Regger, I can only speak for myself and my findings, but my MJ is not my DD so high MPG was not my target when I bored my TB , changed injectors and did the cold air setup….only performance. Emission wise I think some engines (diesels) are tuned to run on the lean side in order to satisfy the emission tests, bigger injectors these engines may increase the HP …..but NOT on the stock 4.0 Renix engine. As mentioned the maximum performance on a normal aspirated petrol engine, is 13-12 AFR at WOT, AFR below this (11-10) will not be as powerful as the 13-12AFR. The AFR analyze curve shows that the AFR is to low and the theory says less performance, also my road testing shows that the performance is better with the stock injectors. So belive me, if the performance was better with the 21 lb/hrs injectors I would never replaced them with the stock ones. Note! This is not the trucks top speed, but the speed passing the fixed measuring point. Did the same run with my bone stock -92 XJ HO (with 77K miles) and reached 155km/h (96 mph)…my ol Comanche is faster than the -92 XJ :brows:

Nice pics and write-up :cheers:

Okay, then why do I hear of people all the time installing bigger injectors on their stock motors?... I know you have to for the strokers, but for the stock motors, its just a waste of time, money, and fuel???.. I KNow on my Cummins Diesel, it mad a huge difference, 50HP injectors gave me just that... yeah I lost about 1mpg, but it sure gets out of its way real fast now!!! My main reason for wanting new injectors, is that mine have been sitting for a few too many years and were on their last legs before the truck went into storage... so I figure, when it comes out fo storage, I might as well put in new injectors, and figured why not go with something that would net a little more HP to turn the big meats it will soon be sporting Thanks, Ryan According to my experience and testing, bigger injectors on a STOCK engine, is waste of time, money, fuel and……performance. After I bored the TB to 60 mm, put on cone filter with heat shield and put in HO injectors the performance definitely increased vs. the stock TB, filter and injectors. (Later I found out that the performance was even better going back to the stock injectors) Recently I did an AFR analyze with the new set-up, I found the AFR was fare too rich with the HO (21 lb/hrs) injectors. Then I replaced the HO injectors with the stock (18.6 lb/hrs), and did an other AFR analyze, the new analyze showed that the stock 18.6 lb/hrs deliver enough fuel for the 60mm TB and cold air cone-filter setup. The min. AFR with the HO injectors was down to 10.2 at WOT vs. 12.0 with the stock injectors. The mixture with the HO injectors was so rich that the O2 sensor was not able to correct (lean out) the AFR to 14:7 in Closed Loop, it stayed as low as 12.1 AFR in cruising. In general the best performance for a normal aspirated engine, is at an AFR around 13-12 AFR at WOT, so when the HO injectors gave 10.2 AFR it was fare too rich. Here is the chart showing the AFR curve for the HO vs. stock injectors. I did some road tests, run the same distance with fixed start and stop points. When I reached the starting point I was cruising at 100 km/h (62mph), when passing the starting point, I floored the pedal and run at WOT to the next measuring point. With the HO injectors I reach 154 km/h (95mph), and with the stock injectors I reach 160 km/h (99 mph) at the stop point. My conclusion is that the performance with stock injectors is better than the HO injectors, even with a bored TB and free flow cold-air setup. Didn’t measure the MPG with the HO injectors, but based on AFR a lot of gas was just going down the drain. The need for bigger injectors and increased fuel pressure first appears when serious engine modifications are done, as major head work, stroking or forced induction.

In order to increase the fuel pressure you have to install a new fuel pressure regulator, mainly an adjustable regulator. By reducing the fuel going back to the tank, the pressure in the fuel rail increase. However, increasing the fuel pressure or installing bigger injectors to a non modified engine is just waste of gas, and the performance will most likely go down. You will run too rich in open loop conditions, and the oxygen sensor will have a fight to keep the AFR around 14,7:1 in closed loop conditions.

Use this formula:

Here's the Jeep injectors. Model Year, ...Part #, .......Colour, ....Fuel Pressure, ...Static Flow, '87-'90, ........53003956, ...Dark Tan, ...39psi, .................18.6lb/hr '91-'93, ........33007127, ...Brown, .......39psi, .................21.0lb/hr '94-'95, ........53030343, ...Tan, ...........39psi, .................21.0lb/hr '96-'99, ........53030778, ...Grey, .........49psi, .................23.2lb/hr '99-'01, ........04854181, ...Blue tip, .....49psi, .................22.5lb/hr If you increase the fuel pressure to 43psi the stock '91-'95 4.0 injectors are rated at 22lb/hr. Other available injectors Ford Motorsport 19.0lb/hr @ 39psi (Part no. FMS-M9593-C302) Ford Motorsport 24.0lb/hr @ 39psi (Part no. FMS-M9593-A302) Ford Motorsport 30.0lb/hr @ 39psi (Part no. FMS-M9593-B302) Chevy LT1 24.0lb/hr @ 43.5psi (Part no. 17124248) Chevy LT4 28.0lb/hr @ 43.5psi (Part no. 17124251) Accel 19.2lb/hr @ 44.1psi (ACC-150119) Accel 21.1lb/hr @ 44.1psi (ACC-150121) Accel 24.4lb/hr @ 44.1psi (ACC-150124) Accel 25.6lb/hr @ 44.1psi (ACC-150126) Accel 29.4lb/hr @ 44.1psi (ACC-150130) The '95 Jeep 5.2 ZJ/Dodge 5.9 injectors (Part no. 53030262) are rated to flow 24.6lb/hr at 39psi. I use the -94 HO injectors with 60mm TB, cone filter and 3" exhaust. Link to installation http://comancheclub.com/forums/viewtopi ... highlight=

Here's bracket with cables.

I put on XJ eletrical mirrors, bolts right up.

I purchased 5mm plexi glass, easy to cut and install.

King size :eek:

Good one :headpop:

Jeep Tricks, very interesting….and pictures will be appreciated :roll: What Trans did he use, the 42RE or 545REF? Tell your buddy to join the club and introduce his 4.7 V8 MJ !

Actually ... it was his son's. After his son commits suicide, he gives the Comanche to Halle Berry. That means Halle Berry is a MJ driver and knows what a quality truck is 8)

Cut'em Offthe MJ its not that hard then you can get rid of the YJ :D Cole Damn, your YJ phobia topped the BS meter.. :D Thanks….It’s Hella Bi-xenon (hi-low in same light), I bought them for a bike project… but they ended up on the YJ. Avenger blower with intercooler, and programmable Split Second piggyback for fuel and ignition.

He,he..the YJ have been a good reliable Jeep, and the no top/no doors alternative is for me priceless, I have also spent so much time and money in it, it have become a part of me...I 'love' the little 'hated' YJ 8) It's powerful as well... But the V8 will go into the MJ, but it's always good to have back-up plans :-) :cheers:

Thanks for the info yj2mj, my plan is to put the V8/5-speed auto (545RFE) into the MJ, and swap the existing MJ AW4 into the YJ. An other option is to put the V8/545RFE in the YJ and replace the MJ Renix with the YJ SC 4.0, what do you think?

Hi guys, As MySonsComanche says, the YJ rims are American Racing. I know the wiring will be a challenge, but I think (hope) it will be doable. yj2mj, do you have any info/links covering the V8 swap into a TJ ? He,he…did this trailer to haul the HD.

It’s finally home. Wiring mess… Ignition switch, instruments and spare TPS, MAP and O2 sensors. Gas tank w/fuel pump

Here's some 4.0L Stroker links... http://www.bc4x4.com/tech/bryce/stroker/stroker.cfm http://www.jeepnuts.com/tech/stroker.htm http://www.lunghd.com/Tech_Articles/Stroker/Stroker.htm http://www.rockcrawler.com/techreports/ ... /index.asp Have them stored under my YJ files on my pc. (stroking my YJ is future plans)

I recently rewired the marker lights on my XJ, just remove the wire going to ground and connect it to the DIR/HAZ wire. The marker light will then have ground through the DIR/HAZ bulb when DIR/HAZ is not applied. When the DIR/HAZ lights are used, 12V is applied to the wire, the marker lights loose grounding and starts to flash (flash opposite of the DIR lights).

The shocks I have is n8016 and n8018, in case they will be too short I can use the on the XJ, they soon need to be replaced. I paid $ 2 200 incl. shipping, it’s a fair price her in Norway. I think I will go for the 242 T-case, it’s perfect for winter conditions, although it’s not as strong as the 231. I know the wiring will be a challenge, but I’m not too concerned at the moment, and will do a lot of research before start up, and I’m prepared to meet many problems during the installation....but we don’t like bolt on’s …do we :-) Tonight I did find the 4,7L Engine Wiring diagrams on the internet, and was able to download them, but a complete FSM will be needed.