what RPM are you spinning your stock bottom end nitrous ls1?
#1
what RPM are you spinning your stock bottom end nitrous ls1?
I am looking at raising my rev limiter to avoid doing a gear change. I just swapped from M6 to TH400 trans. i think the 4.10 will be just shy to where it hits the rev limited before the traps. my question is how high are you guys spinning your stock bottom end ls1 on the bottle? right now i shift it at 6,800 and have the rev limiter set at 6,900. its a heads/cam/intake 150 shot car. im thinking i'll need to hold it thru the traps at like 7,200rpm. is this too risky on stock bottom end, should I set my window switch to turn the spray off and the last 300 rpm it will cross the line on motor? what are your opinions?
#4
Your valvetrain won't live for long at that rpm, unless you have upgraded springs and lifters.
I wouldn't spin a stock bottom end that high. It won't break but it won't live for long.
You can use a lower gear ratio, like a 3.90 or even a 3.73. A nitrous engine has enough ***** for that.
I wouldn't spin a stock bottom end that high. It won't break but it won't live for long.
You can use a lower gear ratio, like a 3.90 or even a 3.73. A nitrous engine has enough ***** for that.
#10
11 Second Club
iTrader: (27)
Join Date: May 2002
Location: East Palestine, OH - USA
Posts: 2,397
Likes: 0
Received 0 Likes
on
0 Posts
I have it calling for the shift at 6400 though it doesn't usually make the shift till 6500. With the limiter at 6800, if I call for the shift at 6500 sometimes it'll hit the limiter before it shifts.
#16
set the rev limiter to 7,200 today. guess i'll go to the track, shift at 6,800 and if i need that extra rpm i can hold it thru the traps if i have to. i'm setting the window switch to turn off the spray at 6,800 also. so if i hold it to 7,200 at the stripe it will be on motor.
#17
10 Second Club
iTrader: (14)
i would think about some arp rod bolts if you were going to spin it that high. The incresed cyl pressures with nitrous really stress the stock hardware, which is usually the failure in the ls1's. You can get some ARP rod bolts for less than 100 bucks and they arent that hard to change. Cheap insurance.