anyone try this off of ebay?

[Dr. Dyno]

Is the mapping of the HO ECU so narrow that it can't handle air and exhaust mods?

Gawd, that Chryco stuff is even crappier than i had previously realized.

The question I have for you guys is, do you test mods with a wide band O2 meter? IF not, how do you know if you are solving a problem, or if you even have a problem?

CRASH

You could increase the stock HP output of the '91-'95 4.0 by about 15% and still use the stock injectors without getting a lean condition. Once above ~220hp, the stock injectors can no longer keep up and the engine begins to ping.
Relocating the IAT sensor so that it picks up cooler air might richen the A/F mixture enough to lessen or eliminate the ping and avoid having to fit larger injectors if your engine's just running slightly lean.
I did that initially but in the end I went for Ford 24lb injectors anyway and ended up running too rich instead of too lean. At least they got rid of the pinging altogether. Fortunately I fixed the richness with a MAP adjuster by reducing the MAP input voltage below the stock 5.0v level.

 

[bsr26]

sorry wrong post

 

[xray]

I got one I would be willing to give it to someone if they could possibly test it on a dyno then we would all know the answer. I'm not going to use it cuz I'm in the process of collecting parts for a stroker. I bought it for a 89.

 

[95RedCherokee]

Sorry to bring this back from teh dead, but I bought it for teh hell of it.I'm dynoing my 95 4.0 in january. I will let you know results before and after the resistor mod I may even post the dyno graphs). Its a completely stock setup, so the results will be from a stock hp level on a motor with over 220K miles on it. BTW: it is just a resistor...not sure which it is....seems to be covered in some sort or shrink wrap...

 

[LazarusMJ]

Is the mapping of the HO ECU so narrow that it can't handle air and exhaust mods?

Gawd, that Chryco stuff is even crappier than i had previously realized.

CRASH

Upon reading JP's writeup on the 4.6 stroker they are building they said that the 4.0 has a tendancy to run lean, especially after airflow mods.

I haven't noticed a lean condition in mine, but i only have a cone filter for added flow. (still have a restrictive exhaust)