Rev limiter?
07-18-2010, 01:58 AM
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Rev limiter? I have a transplanted '03 LQ4. Stock wiring, pcm etc. Mail order tune/re-flash to remove vats, set wheel dia, gear ratio and remove auto trans and A/c stuff. Does this pcm have a rev limiter? The engine shuts off dead at about 5800rpm. I have sent it away twice to the tuner now, the first time he hadn't removed the shift managment that retards ign timing @ 5000rpm to smooth shifts. Maybe there's a rev limiter should go too?
Thanks, Frank.
Thanks, Frank.
07-18-2010, 12:12 PM
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It's quite happily pulling away when it shuts off. I understood that these engines were capable of lots of RPM/power to the stock bottom end. Am I wrong then to rev it higher that that without better rod bolts etc?
07-18-2010, 10:30 PM
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Thanks Bird, I do agree with you, but this engine is still pulling when it shuts off. As I understand it, this bottom end is good till substantially more Horse power and RPM. Down the road I may upgrade to 243 heads, upgrade cam and intake. Am I asking for trouble with the stock '03 LQ4 rods? The '04s LQ4's got the stronger LQ9 rods.
07-19-2010, 06:10 AM
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The metallurgy of the rods I believe is the same, they went from fixed pin to floating pin to try to fix the piston slap issues. Stock rod bolts. from what others have said are good up about 6300-6500 rpms of continuous beating.
If you are not making anymore horsepower there is no need to rev it any higher. If you had it on a dyno, the peak is probably about 5000 rpm range, maybe. The trucks are set up for low end torque, not high rpm horsepower.
Here is a link to the stock specifications from GM.
2004 LQ4 Specs
If you are not making anymore horsepower there is no need to rev it any higher. If you had it on a dyno, the peak is probably about 5000 rpm range, maybe. The trucks are set up for low end torque, not high rpm horsepower.
Here is a link to the stock specifications from GM.
2004 LQ4 Specs
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07-19-2010, 01:47 PM
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The metallurgy of the rods I believe is the same, they went from fixed pin to floating pin to try to fix the piston slap issues. Stock rod bolts. from what others have said are good up about 6300-6500 rpms of continuous beating.
If you are not making anymore horsepower there is no need to rev it any higher. If you had it on a dyno, the peak is probably about 5000 rpm range, maybe. The trucks are set up for low end torque, not high rpm horsepower.
Here is a link to the stock specifications from GM.
2004 LQ4 Specs
If you are not making anymore horsepower there is no need to rev it any higher. If you had it on a dyno, the peak is probably about 5000 rpm range, maybe. The trucks are set up for low end torque, not high rpm horsepower.
Here is a link to the stock specifications from GM.
2004 LQ4 Specs
Again mine is an '03. Can anyone else please verify that I can shift this stock bottom end up to 6 or 6500 rpm at some point down the road?
07-21-2010, 10:57 PM
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