What is the LT4 rev limit?
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Re: What is the LT4 rev limit? (lead_foot)
ttt
Thanks for the info guys.
If the stock LT4 limiter is at 6400, what should it be set to if you run the Hot Cam? :)
Thanks for the info guys.
If the stock LT4 limiter is at 6400, what should it be set to if you run the Hot Cam? :)
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Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Re: What is the LT4 rev limit? (lead_foot)
Thanks 96GS. I'm changing to 4.10 gears next week. Hot Cam is on my todo list.
Did you upgrade the valve springs or stick with the LT4s? :)
Did you upgrade the valve springs or stick with the LT4s? :)
I felt ok about the LT4 springs since the LT4 has lightweight valves and retainers unlike the LT1. Having said that, I looked for better springs. All the springs I found either required machining of the cylinder heads to fit (spring OD too big) or the spring wouldn't fit over the stock spring locators (spring ID too small / no aftermarket locator available either). Because of occasional high rpm useage...6600 or so...I felt pretty strongly about having locators versus flat seats. I had visions of a spring doing the "hula hoop" around the spring seat :cry
If anyone has a drop in valve spring/locator/retainer/locks solution, I'm all ears. Most likely I'll yank the heads in the future for port work and have them machined for better springs at that time.
:cheers:
Drifting
Joined: Jul 2001
Posts: 1,296
Likes: 0
From: Largo Florida
Re: What is the LT4 rev limit? (lead_foot)
ttt
Thanks for the info guys.
If the stock LT4 limiter is at 6400, what should it be set to if you run the Hot Cam? :)
Thanks for the info guys.
If the stock LT4 limiter is at 6400, what should it be set to if you run the Hot Cam? :)
Safety Car
Joined: Sep 2000
Posts: 3,524
Likes: 4
From: Hinckley Ohio
Re: What is the LT4 rev limit? (Springer's LT4)
I have my limiter left at 6400 since I don't want to blow engine.
However based on the torque curves I have seen for both stock & modified LT4's the best shift point would be at the limiter. Can't remember seeing any dyno's going above this point, but based on the flatness of torque curves I would quess for maximum performance the shift point should be even higher, probably more so with hot cam & head work.
However based on the torque curves I have seen for both stock & modified LT4's the best shift point would be at the limiter. Can't remember seeing any dyno's going above this point, but based on the flatness of torque curves I would quess for maximum performance the shift point should be even higher, probably more so with hot cam & head work.
Thread Starter
Racer
Joined: Jan 2002
Posts: 341
Likes: 1
From: Cave Creek AZ
Re: What is the LT4 rev limit? (96GS#007)
I haven't seen any after market springs that will fit right into the LT4 heads either. My thinking is the same as yours, when I eventually get to having some head work done then I can decide to upgrade springs or not. May consider the rev kit instead of heavier springs. Makes sense to me to control the lifter body without adding more load to the lifter plunger and all of the moving assembly. But this was a whole other thread that generated a lot of emotions. So not going there for now.
Thanks again. :)
Thanks again. :)
