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09-24-2010, 04:02 AM
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#1 |
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Registered User
Join Date: Mar 2010
Location: California
Posts: 147
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Speed limit?
Hey guys I got a new 08 Chevy Silverado with a 5.3L in it.
I have a problem, it wont go past 91 MPH? WHY?!? Lol I was cruising down the freeway and decided to see what it can do....but I was surprised it stopped at 91mph. Any reason for this?
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With enough time and money, you can do anything Quoted from my father 1976 C-10 Project |
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09-24-2010, 07:50 AM
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#2 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,228
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Re: Speed limit?
Speed limits (usually via fuel cutoff) are in place to not exceed (a) the ratings on tires, (b) propshaft critical speed or (c) driveline resonances that were deemed to be harmful, whichever is lower.
Is your truck 4wd? Some combinations of tire, gear ratio and the addition of the 4wd t case drive those resonances down into a range that could limit top speed. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 09-24-2010 at 07:50 AM. |
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09-24-2010, 10:48 AM
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#3 |
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Registered User
Join Date: Mar 2010
Location: California
Posts: 147
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Re: Speed limit?
It is a 2wd 1/2ton. I thought I might have done something wrong when I lowered it. Haha I mean I honestly doubt it but it had worried me.
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With enough time and money, you can do anything Quoted from my father 1976 C-10 Project |
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09-24-2010, 12:53 PM
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#4 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,228
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Re: Speed limit?
You mean it ran out of steam, or did it feel like it was being artificially speed limited? (it will "buck" a bit when it hits fuel cutoff).
I didn't even think about the former, because one of the typical speed cut offs is 92 mph (I figured that must be what you had). K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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09-24-2010, 09:30 PM
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#5 |
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Registered User
Join Date: Mar 2010
Location: California
Posts: 147
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Re: Speed limit?
Its like it goes into neutral? it doesnt rev high or slow down. I am not to sure how to explain it? Maybe make a short film of it.
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With enough time and money, you can do anything Quoted from my father 1976 C-10 Project |
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09-25-2010, 10:11 AM
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#6 |
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Moderator
 
Join Date: Jul 2006
Location: Ozark, MO
Posts: 4,893
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Re: Speed limit?
That can be easily tuned out. These trucks have a reputation for throwing the driveshafts at high speed though and it's not pretty so be careful.
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'86 GMC C30 Crew ~ '86 C20 Crew ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '74K10 ~ '71 Cheyenne swb ~'50 3100 bagged ~ '80 Wife ~ Late model kids
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09-26-2010, 01:06 AM
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#7 |
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Registered User
Join Date: Mar 2010
Location: California
Posts: 147
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Re: Speed limit?
Oh really? I see, Well thank you. I appreciate the help guys.
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With enough time and money, you can do anything Quoted from my father 1976 C-10 Project |
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