The stock injectors were 19lb. These I bought are for the 8.1 truck motor, that I thought were 30lb but I think are actually 25.5 at 40 psi. I do have a set of the 42lb I saved from a 8.1 marine engine. I can swap them out. How would I go about setting up dyno run? I actually live in Boynton and ...

I have a 2001 GMC Sierra with 4.8L, Powerdyne 6psi, JBJ Shorties, Delphi 25.5 injectors, Flowmaster, 4.11 Gears, and 20" Wheels. I bought the Predator U7198 back in 06 when I bought the truck. I had the software updated in 2010 to v.9r17. Wondering if I can get a tune written where I can ditch the ...

One problem I ran into with my 01 Sierra is over oiling the K&N. The filter oil sucked in and wiped out my mass airflow sensor. I tried cleaning it but it never ran right until I replaced it.

After talking with everyone there at Diablosport and contacting every local CMR Dealer trying to get the powerdyne tune for my truck I have decided to bolt it on and see if I can get it tuned in with my predator.
Diablosport would need me to do the hardware upgrade, then email the stock tune and ...

When adjusting the PE, do you adjust it towards lean if it is lean or towards rich to richen the mixture? Same with spark. I know it seems like a stupid question, but the results from adjusting don't always coincide. U7198 2001 Sierra 4.8

Does anyone know what injector options I have? I would like to get a set of 42#. I see the Delphi Multec 2 44's are a direct replacement, but I cannot find them for less than $400. Will any other injectors work? Will I need a new fuel pump? Where could I find that?

Okay, I bought the kit. I have the serial to usb adapter but for the life of me cannot get the programmer to communicate with my laptop. I live up the street in Lake Worth. Is there any way I could bring it by or is there somewhere else I could bring it where someone can download and upload to it?

I have been talking to a guy about buying this Supercharger kit for my 01 GMC Sierra Truck. He said it is complete except for the tuner. I have a U7198. Is there any way to upload the tune to my tuner or can I adjust my tune to work? I have already adjusted my injector slope to -7 and my PE to -8 to ...

It seems that I cannot get enough fuel to my engine. I have lowered my injector size in slope 6 and raised my PE to 4 and 4. I seem to be good cruising and hard acceleration, but the just off idle gets lean and pings. I have cleaned my maf with the CRC Maf cleaner and run injector cleaner in my gas ...

I have a 2001 GMC Sierra with 4.8 and U7198. I want to upgrade to a higher flow rate injector. Where can I find out which ones will fit and what is the preffered flow rate to work with?

Dude! I think that was my whole problem. I don't notice any pinging anymore and it is idling more smoothly. I am not positive yet, but I am pretty sure that is what has been driving me crazy all this time.

When my preditor builds a tune off of my stock tune, what changes does it make? Is there a set value for fuel and spark that it sets determined by the value of the stock? How expensive is it to get a tune custom built for my truck?

I ordered the CRC Cleaner yesterday and is supposed to come in this morning. I will try it at lunch and see if it clears it up.

I have a 2001 Sierra with a 4.8 and the u7198. I had pretty much the exact same problems. When I first got the tuner and ran the 93 with 93 fuel I believe I had no preignition problems, though I didn't really pay much attention to my kr. Then after a couple months I decided to switch to the 87 to ...

" "modify parameters"...you will see PE spark. adjust your tables starting at about +4%....install "modified tune"...then check for KR at WOT again..." :?


Isn't the PE, or Power Enrichment, setting for the amount of fuel under hard acceleration like an accelerator pump? I have personal interest ...