Engine choice revisited LQ4 vs LQ9

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Aug 2, 2005 | 02:18 AM

thunder550

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From: Phoenix, AZ

Engine choice revisited LQ4 vs LQ9

I have posted a couple of threads about what I am hoping to get out of my next setup....most of the replies have told me to go with the LQ4 because of the lower compression with boost. But....then I see this thread: https://www.performancetrucks.net/fo...d.php?t=345783

Sounds to me like the LQ9 with a good tune is safe up to at least 10psi...which is probably around where I'll be. So...why wouldn't I go with the LQ9 instead of the LQ4?

Aug 2, 2005 | 06:58 AM

1slow01Z71

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From: Austin, TX

IMO you arent pushing the envelope so much with lq4 as far as too much CR especially in the hot weather you live in you have to worry about detonation.

Aug 2, 2005 | 09:59 AM

thunder550

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From: Phoenix, AZ

I'll probably replace the small Radix intercooler with the larger optional one as well, if that makes any difference.

This is the part that I focused on:

Quote:

Originally Posted by PappyDan

I know he will give you as much as your fuel system and injectors can deliver on 91 or 93 Oct, without causing damage to the engine. your final result could be some where around 8 to 11 psi when he is finished.
be sure to post the numbers everybody would like to see.