Rev limiter?
Thread Starter
Staging Lane
Joined: Nov 2006
Posts: 86
Likes: 0
From: B.C. Canada
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.
Thread Starter
Staging Lane
Joined: Nov 2006
Posts: 86
Likes: 0
From: B.C. Canada
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?
Thread Starter
Staging Lane
Joined: Nov 2006
Posts: 86
Likes: 0
From: B.C. Canada
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.
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
Trending Topics
Thread Starter
Staging Lane
Joined: Nov 2006
Posts: 86
Likes: 0
From: B.C. Canada
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?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Stock 03 LQ4 cals have the rev limiter set at 5700. Yes with tuning software you can set it higher. if you want to set it higher than 6200 I would at least put a set of LS6 valve springs on it.
on the 2003 there are a few limiters, some are at 5900 and the rest are at 6000. If he dont get it figured out, you can send it to me and ill fix it for you at no charge. Just cover shipping.
Thread Starter
Staging Lane
Joined: Nov 2006
Posts: 86
Likes: 0
From: B.C. Canada
