can y'all help me??
#1
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Join Date: May 2004
Location: Houston,TX
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can y'all help me??
I was trying to test my top speed in a 4 mile stretch and the car seems to get to 6400 very easily in 3rd and 4th gears but in the fifth it hung up at ~5600 at almost 165 MPH what could be the reason ??? Is it the aerodynamics? !! Have this scanned from my HPtuner that wouldn't go beyond 158MPH can you guys help me figuring out the problem.
#3
The 5th gear is more of a cruising gear. There is a calculation that shows how much power it takes to move a car at speed versus wind resistance and gearing. Basically, if you car made more power, it would definately push the car to a higher MPH...in 5th gear.
#5
It may help a little but how many times are you going to be going 5,500+ RPM's in 5th gear? It's not worth the money for the small change it may make. You would see the biggest difference in how much power your motor makes. Add another 200-300hp and I almost guarantee that car will see 6,500+ in 5th gear.
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#10
TECH Senior Member
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I would think that with your mods you should be able to see faster speeds than that. I would think a cam and boltons car would get into the upper 160s maybe even low 170s. Afterall they claim a stock b4c package is 170 MPH capable, and GM supposedly circle track tested a stock 98 f-car to 175. Those are under optimum conditions though. It looks like your motor just runs out of steam, not like it hits a wall (figuratively speaking) at 158. Have you had the car dyno'd? Did you try running in both directions? Tires fully inflated? Also, why are your LTFTs positive at WOT?