safe to spray in 5th?
On The Tree
Joined: Jul 2006
Posts: 164
Likes: 0
From: houston, TX
Not really. That is a lot of load on the engine. If you sprayed 1-4, then went into fifth at 5K rpm or then the load is less, just cruising along and going w.o.t. and spraying at 3.5K is gonna be hard on the engine. I've got an auto. so I could'nt say for sure how your tranny will deal with that either, probably wont like it.
Well say I'm running a Cobra. I run of of 4th gear at around 120 I think. I've raced cobras before to 145. I can beat a stock cobra no problem but if I get a modded one on the line I might need to use the juice.
TECH Apprentice
Joined: Sep 2004
Posts: 377
Likes: 0
From: Kona, Pearl Ridge
ive sprayed my car in 5th...once... if anything ill max out 4th and call it a day. i'll never go into 5th drag racing the car(1320) so i dont see a need. the car is going an easy 140+ maxin out 4th its plenty fast.
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Originally Posted by chris.shea
ive sprayed my car in 5th...once... if anything ill max out 4th and call it a day. i'll never go into 5th drag racing the car(1320) so i dont see a need. the car is going an easy 140+ maxin out 4th its plenty fast.
j/k Just looking for info in case there arrises a need. 
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Staging Lane
Joined: Feb 2006
Posts: 89
Likes: 0
From: Northwest In
Originally Posted by bjamick
Ya if you spray to the top of 5th you better have 2 10lb bottles back there . ^^ what he said have some video of this please bc at the top of 5th you will be at like 170+
. ^^ what he said have some video of this please bc at the top of 5th you will be at like 170+
i was wandering the same thing because i have 3.89's w/27" tires. on motor i go through the traps @ 6100/121mph and i'm gonna hit it with a 200 
i can spin it to 7k easy though.
i can spin it to 7k easy though. 
Originally Posted by getsomebeyatch
With a 3.89 gear i dont think he be at like 170+ correct me if im wrong but i just dont see him reaching that speed with that high of a gear.
after my H/C swap i took a buddie for a ride and i hit the rev limiter in 5th did the math on a 6800rpm and 26in tire with a .74 OD for 5th it was right at 183 with a 3.89 gear so its possible. man was that fast and dumb i forgot i installed a plug in two of my sidewalls. i never did tell my buddie.
but before the H/C i did spray in 5th to about 160 and called it good.
oh yeah a 27 at 7000 in 5th you would see
195.5 ish here is the formula
(rear gear ratio*MPH*TRANNY RATIO / divided by tire height* 336)=engine speed
so 3.89*195*.74/27*336=6985.40266666 there ya go
do the same for your trap its super close i did yours just leave out the .74 and 122 was 5900 rpm i did 122 cause its averaged you tach maybe off
People run the top speed miles spraying, people have done it on here. Ask PatrickG I think his name is, he lists it in his sig what mph he reached in a mile. It was around 180ish...