Lly fpr vs. lbz fpr

Lilmonsta2010 · Aug 14, 2015

Ok so ive been doing some searching and i see that the lbz for flows more and maybe holds more pressure that a lly fpr. My question is which one holds up better. I have a 04.5 lly with 270k and my truck has been doing the surging about 100rpms at idle since around 240k i know its the fpr but im wondering why it sticks like that. Is it a factory defect? I only ask because i dont want to change it and 50k later its doing it again. It seems to be a lly problem as i have not seen near as many lbzs doing the surge at idke so i was thinking maybe the lbz fpr would be a better fix since ill be changing it anyways.

Truck mods are: banks ram air, egr delete, 5" straight pipe, efilive.

deathtrapracing · Aug 15, 2015

I was told to stay with the LLY fpr. Had to do with the specs and how the ecm controlled it. With that said, I am not sure if adjustments could be made in EFIlive to compensate for it.
Best price I found for the lly fpr was @ summit racing. it was about $112 OE bosch.

Lilmonsta2010 · Aug 15, 2015

I found both of them for about the same price 110$ and 112 i know for a fact the lbz flows better and that all you have to do is load the lbz fpr table and it will run as its supposed to. I just dont ever want the fpr to do the idle surge ever again. Talked to my tuner and he said its easy to change the table over. I just think if the lbz is an upgrade too why not lol id like to hear from someone that the lbz fpr is longer lasting lol

66lilly · Aug 16, 2015

Pretty sure LLY fpr is limited to 24k and LBZ bumps up to 26k rail pressure. Don't quote me though

CaptPhil · Aug 17, 2015

Incorrect. Either can be commanded to run 26k.

The lbz flows marginally more, and requires a simple table change in your tune for it to run correctly.

66lilly · Aug 17, 2015

Thanks for clearing that up!

Lly fpr vs. lbz fpr

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