Need some help with boosted lq4

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Jul 4, 2016 | 01:48 AM

O90110

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Need some help with boosted lq4

As the title says I'm looking for some help with my blow through LQ4. Once boost starts coming in and raving around 3-3.5k the engine breaks up and restricts me from reving any higher. 2001 LQ4 truck block, stock bottom end(new bearings and rings) stage 2 tick performance cam, csu blow through 750, Victor jr intake, Daytona sensors box, 76mm turbo(12psi) non I/c ran on e85. Plugs are BR7EF's gapped at .020 fuel pressure 5.5-6psi(with boost reference regulator) timing is just a base so far at 30deg in vacuum then dropping 1.5deg for every 1psi of boost. I'm totally new to the boosted lifestyle and any advise/come to are greatly appreciated. Thank you in advance and any other info needed just ask

Jul 4, 2016 | 11:39 AM

O90110

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Bump.. anyone???:

Jul 4, 2016 | 01:07 PM

MY_2K_Z

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From: Houston

Valve springs

Jul 4, 2016 | 04:08 PM

crowstyle

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what map sensor you have.

Jul 4, 2016 | 04:46 PM

O90110

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Valve springs are brand new with cam and it's a 2 bar map. Part number 12615136. Did some searching on this forum and found this works out of a cobalt Ss I believe. Truck breaks up under boost only for sure. I can ease the throttle without boost and keep it going but once it starts building it just breaks up

Jul 4, 2016 | 07:40 PM

sbcgenII

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From: Fort hood

So at 1 psi of boost your are at 28.5*? I don't think my stock timing table had that much in it anywhere at wot. I would pull out 10* for a start. How much boost are you making at 3/3.5k? What is the AFR? Does it break up as soon as it hits boost?