Is your tach off?
Thread Starter
Drifting
Joined: Aug 2009
Posts: 1,971
Likes: 243
Is your tach off?
I just realized this tonight. I wound the LT1 out a bit high and noticed it hits the fuel cut at what appears to be about 5800 rpm on the tachometer. Now, I thought a bone stock LT1 has a fuel cutoff at 6300 rpm? I do know redline is lower than that. Am I incorrect on the fuel cut off rpm or is my tachometer about 500 rpm off on the high side?
If it is reading inaccurately, is there a fix? Does anything wear out and cause it to lose its accuracy? Recalibration possible?
94 LT1/ZF6
If it is reading inaccurately, is there a fix? Does anything wear out and cause it to lose its accuracy? Recalibration possible?
94 LT1/ZF6
Thread Starter
Drifting
Joined: Aug 2009
Posts: 1,971
Likes: 243
Well I guess that settles that. My tach must be pretty accurate. I know the hashed off 'redline' area on the tach begins at 5500 but for some reason I thought actual fuel cutoff was 6300. Just out of curiosity, it was mentioned the LT4 has fuel cut at 6300 rpm but what is the redline?
I know the LT4 has improved breathing but what is the mechanical difference that allows for the higher rev? Is it simply a matter of the addition of roller rockers and better valve springs that allow for the increased rev capability?
I know the LT4 has improved breathing but what is the mechanical difference that allows for the higher rev? Is it simply a matter of the addition of roller rockers and better valve springs that allow for the increased rev capability?
