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update: With no offgoing pressure bump and clamping the fill volume for 2-3 at 29 from 21 and setting min and max to 29, it feels pretty dang good....

Exhaust is all sealed up. at least back to the mufflers now. Drove it and the STFT look good. No real difference pre or post sealing up the little...

He is saying why haven't you post your tune file yet? We still have no idea what the tune is like right now, so we have no way of helping you...

Will do. Stock is about 7-8psi and it's now making about11-12psi. I had a stage 2 tune on it before and it was running about 16psi so will bump it up...

Always use beta to write, put a battery charger on. My OBD2 port has a loose connection, so I use a long high quality cord and stand outside the jeep...

Am I correct in assuming that all of those numbers would be with in at least standard deviation or close on a 5.3 version with same cam?

Almost a year later since last post and it seems problems with JTEC are not solved. I'm having problem to write on JTEC+ (2001 Cherokee 4.0) with...

It?s like a stage .5 just a bit more boost than stock and the fueling is cleaned up, use the compare function and compare logs to see the difference,...

I use 14.12 for e10, anywhere 14.08-14.12 can be accurate. GM probably wasnt making a mistake when they set the stoich on the stock calibration....

Not sure what you are after blindsquirrel?

Those are not all that critical, but you can if you like. Yours aren't too far off as-is.

Up to date March 2025. Does anybody can confirm that MPVI3 is compatible with JTEC ? Especially for 2001 Cherokee 4.0

that maf curve looks like your trying to rocket to space lol looks like the resolution is to high in that photo try adjusting your screen res.

there is multiple adjustments you have to make in your stock tune file before you can even drive around and log. go check out Goat rope youtube...

12594512? Came from a '07 Tahoe LMG like the tune file says? Find the injector p/n in the tabs at the bottom. E40 injector tables are...

(and '06 Envoy/Trailblazer is E40, not E67. E67 was for '07-'09 in those trucks)

8-digit GM part number as found on the side of the injector?

You can actually tune your ski perfectly without ever touching those tables, but they are helpful. 1. They show in the logs so you can quickly see...

I have coped the following from the Corvette compare file over to my tune file: Flow Rate VS KPA Min Injector Pulse Short Pulse Adder Offset VS...

Your tune is much better thank you. Im just looking through the stock tune and your tune and trying to get my head around these tables. Thanks again

Using MPVI3 to read/write 2001 Jeep Cherokee 4.0. After countless tries i have achieved to read the ECM. But I am having an issue writing a tune to...

How do i know if my maf is dialed in correctly

HI,very good tutorial!!!!So I have a question, in the last table you explain (power enrichment), is it better to start with that table instead of...

Alight, got back to this. I loosened all the valves, set it at TDC, set them all to 'no lash', rotated the crank 360 degrees, did the same. Then...