C5 Fuel Cut Off
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 1,162
Likes: 0
From: Dubai
C5 Fuel Cut Off
The factory fuel cut off for C5's is at about 6200 rpm. Some Mid range performance cams' powerband goes up to about 6800 rpm ( with the proper valve train upgrades of course ). How can we move to cut off up in the rpm to take advantage of the extra rpms ? Pls advise.
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 1,162
Likes: 0
From: Dubai
Re: C5 Fuel Cut Off (diynoob)
Just clarify something , are you saying that the rev limit & fuel cut off are the same thing ? :confused:
I have a Predator on order so if you are saying what i think ur saying then i think i can bump up the same a couple of hundred rpms until i get the almighty LS1 Edit :steering:
I have a Predator on order so if you are saying what i think ur saying then i think i can bump up the same a couple of hundred rpms until i get the almighty LS1 Edit :steering:
Le Mans Master
Joined: Aug 2001
Posts: 6,213
Likes: 1
From: South Alabama
Re: C5 Fuel Cut Off (V8_Club)
I'm not a mechanic but it is my understanding that the fuel cut-off at whatever RPM is programmed is essentially the rev limiter. So when the rev limit is raised or lowered that setting determines at what point the fuel is cut-off. Don't know all the tech details but I believe that's how it works.
Safety Car
Joined: Mar 2002
Posts: 4,928
Likes: 1
Cruise-In V Veteran
St. Jude Donor '09
Re: C5 Fuel Cut Off (Cajun75)
I'm not a mechanic but it is my understanding that the fuel cut-off at whatever RPM is programmed is essentially the rev limiter. So when the rev limit is raised or lowered that setting determines at what point the fuel is cut-off. Don't know all the tech details but I believe that's how it works.
Team Owner
Joined: Sep 2001
Posts: 23,283
Likes: 906
From: Lake Elsinore, CA
Re: C5 Fuel Cut Off (V8_Club)
Rev limiter on the LS1 is 6000 and fuel cut-off is 6200. Rev limiter on the LS6 is 6400 while fuel cutoff is 6500. These figures are from Chevy's Corvette web site.
:cheers:
:cheers:
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 1,162
Likes: 0
From: Dubai
Re: C5 Fuel Cut Off (Patches)
OK. Now we're back where we started from. Can anyone who run a bigger cam confirm ? Are the rev limit & fuel cut one or are they different ? :confused: :confused: :confused:
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Tech Contributor
Joined: Oct 1999
Posts: 41,036
Likes: 9,798
From: Charlotte, NC (formerly Endicott, NY)
Re: C5 Fuel Cut Off (V8_Club)
The rev limiter (fuel cutoff on a LS1/LS6) activates right at 6250 rpm on the Z06 it activates at 6500. I used a HPIII on my 97 to raise the limiter to 6500 and the limiter (fuel cutoff) did not activate until I hit 6500 rpm. When the engine started cutting out the tach was right at 6500. That should clarify it.
Bill
Bill
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 1,162
Likes: 0
From: Dubai
Re: C5 Fuel Cut Off (Bill Dearborn)
Thanks. The sound of experience is always great.
In conclusion : Rev Limiter = Fuel Cut off.
I think this thread helped clariy matter. This is why forums are a great place. :thumbs:
We can all benefit & share experiences. :cheers:
In conclusion : Rev Limiter = Fuel Cut off.
I think this thread helped clariy matter. This is why forums are a great place. :thumbs:
We can all benefit & share experiences. :cheers:
Team Owner
Joined: Sep 2001
Posts: 23,283
Likes: 906
From: Lake Elsinore, CA
Re: C5 Fuel Cut Off (V8_Club)
My bad. I was thinking redline when you said rev limiter. However, what's curious is they (www.corvette.com) list redline and fuel cutoff for the LS1 and LS6 as:
LS1 LS6
Redline (RPM) 6000 6500
Fuel shutoff (RPM) 6200 6600
I've always heard 6250 fuel cutoff for the LS1 as Bill has posted. Anyone know which figure is correct or if it's been revised?
LS1 LS6
Redline (RPM) 6000 6500
Fuel shutoff (RPM) 6200 6600
I've always heard 6250 fuel cutoff for the LS1 as Bill has posted. Anyone know which figure is correct or if it's been revised?
Intermediate
Joined: Sep 2013
Posts: 28
Likes: 0
From: Worcester Massachusetts
So, I've experienced the fuel shut off twice now, the first time startled me (I didn't realize what was going on), but after the second time, I slowed to cruising speed (70mph) after the shut off, and for a few miles, the car would hesitate ,buck and not really go anywhere when giving it gas (in any gear).. I had to pull over and shut the car off and restart then everything was fine...
Thoughts?
Thoughts?
Race Director
Joined: Mar 2008
Posts: 12,413
Likes: 502
From: Rio Rancho NM
So, I've experienced the fuel shut off twice now, the first time startled me (I didn't realize what was going on), but after the second time, I slowed to cruising speed (70mph) after the shut off, and for a few miles, the car would hesitate ,buck and not really go anywhere when giving it gas (in any gear).. I had to pull over and shut the car off and restart then everything was fine...
Thoughts?
Thoughts?
http://www.stengel.net/diccodes.htm
Intermediate
Joined: Sep 2013
Posts: 28
Likes: 0
From: Worcester Massachusetts
Sounds like a different issues because I'm sure you where at like what 1200-1500 rpm at that speed? What codes do you have?
http://www.stengel.net/diccodes.htm
http://www.stengel.net/diccodes.htm
