ls2 bait

iTrader: (11)

went to the local 1/8th mile last night and my car was hitting the rev limiter (6500) as i crossed the traps. i was only trapping 85.xx, from what the gear calculator said i should be able to go to 93 mph. (car has 4.10's) whats going on here? its a 10 bolt so it couldnt have 4.30's in it which would make more sense.

smokeum99ta

iTrader: (15)

How tall are your tires?

ls2 bait

iTrader: (11)

stock 25.7" i was running 275/40 et street radials.

smokeum99ta

iTrader: (15)

I agree with you on the mph you should be going, but when you hit the rev limiter your car will slow down and that could explain your 86mhp. just my2cents

GuitsBoy

iTrader: (4)

Youre still accelerating through the traps. It reads the average speed from when you pass the first sensor till when you pass the second sensor.

ls2 bait

iTrader: (11)

it just doesnt seem like i could go 7 more mph in a 10 ft span. something seems fishy.

MattIROC

iTrader: (19)

sounds like you dont have 4.10's. Mine shows 91 mph but my speedo is 2 mph even after being recalibrated, stock tires still.

wrench

See if you can find or a borrow a portable GPS navigator. They usually have a speedometer on it. When I had my 04 GTO with the digital speedometer it was always within 1 mph to the Navigator. Then you'll know for sure if your gears and calibration are in sync.

BackinBlack02SS

iTrader: (7)

auto or manual?

ls2 bait

iTrader: (11)

its a manual. when i bought the car the previous owner had installed the 4.10's and never calibrated it. so i picked up a hypercrap local to calibrate for the 4.10's. other than that its on a stock size tire. im confused.

keliente

iTrader: (22)

I have 4.10s with a lightly bolted on car. I pass the traps around 87mph, making sweet sweet love to the rev limiter in 3rd gear.

ta12sec

iTrader: (3)

if ya put the car in 4th gear (1:1 ratio) and do 75 mph your tach will read your gear ratio 3:42s wil read 3400 rpm or so 4:10s 4100 ect