LT4- Rev limiter?
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LT4- Rev limiter?
HI- Does anyone know for a fact if there is a rev limiter on an LT4 motor? If so, can I trust it when I drag race??
Anyway I re-programmed it using the hypertech programmer to 6400. Can I still trust it?
If it does have one what happens if I hit it? Does the motor shut down?
Thanks for your help! :chevy
[Modified by eamador11, 1:55 PM 12/16/2001]
Anyway I re-programmed it using the hypertech programmer to 6400. Can I still trust it?
If it does have one what happens if I hit it? Does the motor shut down?
Thanks for your help! :chevy
[Modified by eamador11, 1:55 PM 12/16/2001]
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From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
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Re: LT4- Rev limiter? (eamador11)
If you listen carefully, you can hear me bouncing off the rev limiter here:
http://temp.corvetteforum.net/c4/mrm...akinoffbg2.mpg
I don't recommend doing it often, I think that is why my water pump went.
http://temp.corvetteforum.net/c4/mrm...akinoffbg2.mpg
I don't recommend doing it often, I think that is why my water pump went.
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Re: LT4- Rev limiter? (Glock'94)
You're lucky if your water pump going is all you have wrong when you peg the rev limiter all the time.
Brad
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From: Dallas TX
Re: LT4- Rev limiter? (GS Ragtop)
Well, the rev limiter of the LT4 is 6300.. and I've always thought of a rev limiter as an absolute maximum for a car. Yes, it'll run a little higher than that (stock), but it's not necessarily safe. Just my opinion...
Elite Torch Red Member
Joined: Sep 1999
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From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
Cental/South NJ Events Coordinator
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CI-II Burnout & Drag Champ
St. Jude Donor '03-'04-'05-'06-'07
Re: LT4- Rev limiter? (Glock'94)
Curtis, I don't always peg it, but on occasion I will hit it.
Melting Slicks
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From: Tampa Florida
Re: LT4- Rev limiter? (eamador11)
LT4 revlimiter is set at 6400 stock. Redline is 6300 rpm.
I run the end of my quarter mile runs on the rev limiter in third gear ~110 mph.
It cuts the fuel, but is not like hitting a wall. Is it hard on a car...well it is hard on a car to run it to redline...so hardly any more hard on it than hitting redline in my opinion.
Engines are pretty durable-mine has 73,000 miles-not cruizer ones either.
I wouldn't be holding it in neutral on it though.
[Modified by No Go, 5:11 PM 12/16/2001]
I run the end of my quarter mile runs on the rev limiter in third gear ~110 mph.
It cuts the fuel, but is not like hitting a wall. Is it hard on a car...well it is hard on a car to run it to redline...so hardly any more hard on it than hitting redline in my opinion.
Engines are pretty durable-mine has 73,000 miles-not cruizer ones either.
I wouldn't be holding it in neutral on it though.
[Modified by No Go, 5:11 PM 12/16/2001]
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From: Westminster MD
Re: LT4- Rev limiter? (eamador11)
I hit the rev limiter all the time autocrossing. Small courses are frequently faster when you just stay in 1st gear. The LT4's higher rev limit means more usable engine range within a given gear.
Racer
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From: Veracruz
Re: LT4- Rev limiter? (TravisD)
It's programmed to protect the engine. (And avoid warranty claims)
If the engine would be hurt by pegging the rev limiter, G.M. would have set it even lower than it is. :seeya
I have mine reprogrammed (Hypertech).
I try to shift at 200 RPM's below the limiter. Usually it works great without hitting the limit. :yesnod:
[Modified by LT-IV, 7:59 PM 12/16/2001]
If the engine would be hurt by pegging the rev limiter, G.M. would have set it even lower than it is. :seeya
I have mine reprogrammed (Hypertech).
I try to shift at 200 RPM's below the limiter. Usually it works great without hitting the limit. :yesnod:
[Modified by LT-IV, 7:59 PM 12/16/2001]
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Re: LT4- Rev limiter? (eamador11)
You should be fine. It's really all about your valve springs more than anything. The story goes with the LT1 anyway that if you hit the rev limiter about twice you just ruined your springs. Rumor has it that they are shot after 50,000 miles. Anyway worn out springs will cost you HP and your valves will float in the higher RPM's. I've hit the limiter on mine since I've done the cam several times, being that the tach doesn't read that high. Anyway the springs are good for more than that, hell people with stock bottom ends will turn 7k. I don't think I want to, but it can be done.
If it really worries you I would buy an MSD box or something just so you have a better rev limiter. These can be set to whatever you want and they drop the spark rather than fuel, which is much better on the motor. Just set it about 100 rpms before the factory limit.
If it really worries you I would buy an MSD box or something just so you have a better rev limiter. These can be set to whatever you want and they drop the spark rather than fuel, which is much better on the motor. Just set it about 100 rpms before the factory limit.
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Re: LT4- Rev limiter? (NotSlo)
Guess that's what happened to my waterpump too! :crazy:
BTW I got this from
http://vette.ohioracing.com/majmods.html
sound familiar to anyone?!!
[Modified by BrianCunningham, 1:44 PM 12/17/2001]
BTW I got this from
http://vette.ohioracing.com/majmods.html
Gee what's that knocking noise?. The motor blew right at the finish line of an autocross event in the middle of nowhere Michigan. Of course right at the height of race season and one day after I had just spent big bucks on 4.09 gears. I broke my vette and Al Murrel, a fellow competitor, hauled me home. Thanks Al! You have an invitation to co-drive my car! Also, I owe thanks to John & Debbie Fessler, and Paul Wines for hauling my tire trailer home.
A word of warning, 6200 RPM is the Limit for a stock LT1. I set my rev limiter to 6400 RPM against the advice of Justin Vandersall (Superman Vette Mechanic). The motor lasted for maybe 10 revs at that limit. The LT1 rod caps can not take high RPMs. The cap on the number six cylinder stretched. The piston began to slap against the head when down revving. As soon as the engine cooled the bearing spun.
A word of warning, 6200 RPM is the Limit for a stock LT1. I set my rev limiter to 6400 RPM against the advice of Justin Vandersall (Superman Vette Mechanic). The motor lasted for maybe 10 revs at that limit. The LT1 rod caps can not take high RPMs. The cap on the number six cylinder stretched. The piston began to slap against the head when down revving. As soon as the engine cooled the bearing spun.
[Modified by BrianCunningham, 1:44 PM 12/17/2001]
