Sorry if this is really stupid. I have heard some say that its ok to do and I have heard some say to never do it. Will spraying in 5th put way to much stress on the motor and blow it up? lets get a definative answer. Thanks

 

I would also like to know the answer

 

i personally do not know...but i thought that as long as you were over 3K rpm that it didnt matter what gear you were in?

 

Well...this is actually a complex question that does not have a yes or no. You could spray in 5th and you can do it safely....but you have to alter the way you look at your setup and how its tuned. Spraying from first all the way to the top of 5th will GREATLY increase the likleyhood of detonation.

You see guys that run the 1/8 mile at the track really push thier setups and get away with ALOT. They have succes and go really fast. Then take it to the 1/4 and have major issue with reliability. This has to do with heat buildup during the run over time and load VS the tune.

Same goes for spraying through 5th. if you want to spray through 5th you are REALLLY gonna need to go heavy on the timing retard, go heavy towards the rich side on Af ratio, and HEAVY HEAVY on the octane.

Run the highest octane you can.

 

ive seen a stock 140k miles lt1 on 150 shot pray through 5th to the rev limitor WITH 4.10....

also seen a built ls1 making 650rw spray 5th and blow up...4.10 wih 28 inch tires...

general consensue is its too much load on the motor...4.10 and 26 inch tires is a little longer then stock 4th gear...so its relatively safe with a good tune

 

What if its on the highway from 3rd to 5th? Would that be dangerous? i have low timing and my tune is rich when i'm on the spray. I didn't think it would be that dangerous because its only through 2 gears.

Prey4me, sorry for the hi jack. I just started wondering the same thing yesterday

 

i did 2 150shot 2nd-5th gear pulls on the freeway racing a cobra and it resulted in this on #8:





i had 3 degrees of timing pulled, TR6 plugs, and fuel pump. i would not do it unless your car has a good tune.

 

you are going to have to go even richer on the tune than you did you the 4th gear pull, and if I were you I would even pull another 2* of timing. The increase in load is pretty heavy, especially if you have a taller ie 28" tire. Remember it's better to go way safe and slowly add ti ming back in then **** up once and grenade a motor.

 

guys...octane is the best change you can make. 104 unleaded would be a HUGE step towards safety.

 

since were on freeway spays, how would that differ from a auto. like if i turned on the kit and bout to race doing highway speeds. would it be okay to activate it and be safe on my car???

like said above heared was ok and bad to do.

but car has a tune

 

My car did not like it at all. I could tell as soon as I hit 5th that it was too much load, the car detonated so bad I could feel it.

 

My tune is on the safe side. My afr is rich and my timing is retarded quite a bit. It might be pretty safe for me to spray in 5th but i dont want to mess anything up

 

i did it for u tonight just for the sake of education and im sorry to tell u that it drove right thru my clutch.

 

If 5th gear comes before the 1/4 mile then its a great idea and if your not a good 3 links ahead of your opponent then its a even greater idea but thats just my view i do it every time i run the 1/4 and have been for a while and well no problems so i can't see were a properly set up car should have trouble....

 

and i run 92 pump gas thats it however i love the smell of racing gas

 

Sorry to hear that but i'm sure i'll be clutch shopping before you know it

 

So some people are lucky and can get away with it and others just have problem.....I guess it's just how your car wants to respond to it....

 

LOL...no luck about it. Guys this is like anything else in the racing world. There are about 6-7 factors involved.

Timing
size of shot
octane of fuel
Af ratio
load (due to gearing, weight speed)
Compression
Plug heat range


you guys that say that you do it all the time and have no problems obviously hve those parameters in the safe zone. maybe your just spraying a 100 shot (no biggie), maybe you are are spraying a 150 on pump gas with a conservative tune and plenty of timing retard. But when asking the question "is it ok the spray in 5th" some people are thinking 200 shots...or 250 shots or even 300+ shots.

So saying "yeah I do it all the time no problem" is not an answer unless you give the details.

Also....are you just popping it in fifth in the 1/4 for a split second...or are you running out to max RPM in 5th in a top speed run? All of these parameters must be known before you can decide if it will be safe for you to spray in 5th.

 

this guy is good well he just let the cat out of the bag and i can't see anything he left out seriously well put 383LQ4SS

 

Shouldnt the race be over by the time u reach 5th gear? LOL