Drag Racing Tech - Can I spary a 4400 yank? What can I expect?

I have a LME forged 347 LS1 with 5.3 stg2.5 heads from Texas Speed and MS3. I have a 90mm LSX intake, headers, spiral flows.

First of all is it OK to Spray this engine. I told the shops that was what I planned on doing when I got the setup.

My car has a 12bolt 3.73 rear.

I was told to use a 3500 stall, which is what I had, but I have only been running NA since having it built and decided to got higher on the stall.

Right now I have the car set to shift at 6000, but on logs it shifts at 6400. On a dyno pull before the intake, it was still pulling at 7000, but I would rather shift lower to save wear and tear on the car because I race it a lot in brackets. I just want the spray to qualify better for certain classes and for fun. Not to use on a regular basis.

The car is in need of a tune. It is on speed density tune right now. I haven't had it on the dyno or tuned. I tuned it myself, but it had already been tuned without speed a speed density setup by Texas speed before the intake. I am defiantly not a tuner and pretty much got it to what I think is a safe tune for me. It's been running on that tune for the past 4 years. So far my best 1/8th is 7.03 at 96MPH and best 60ft is 1.47. When its a 100 degree day like it has been, it runs around 7.3

It is a fairly light car and has had most all the weight I can get out, out. No comforts and sawed off, but does have a full cage.

I'm running 26*11.50 et streets. The car is minitubbed although it has not been taken advantage of as of yet.

I know I could benefit from a tune alone, but if I can spray with this setup, what could I expect from a 150 shot?

If you're on the edge now with your tune....a little N2O to the mix could push it off the edge to total failure....just a thought.

what diameter is the converter? and what is it stalling at on your car now?

If you're on the edge now with your tune....a little N2O to the mix could push it off the edge to total failure....just a thought.

No, I'm not on the edge. It just needs a tune. It will be tuned first if it is sprayed.

what diameter is the converter? and what is it stalling at on your car now?

I think it's a 10in. I don't know how to determine what it stalls at.

If you data log it which if you're tuning it yourself you are, find out what rpm the data log tells you it is recording when the mph reaches 1mph. This will tell you what the stall is flashing too. Basically tell us what rpm it is at between 1-5mph. Say it's at 5000rpm at 1mph and 5300 at 5mph. Your stall would then be flashing 5000-5300rpm on launch.

This is the best way to determine if you have any more room it can flash too if you were to add nitrous.

If you data log it which if you're tuning it yourself you are, find out what rpm the data log tells you it is recording when the mph reaches 1mph. This will tell you what the stall is flashing too. Basically tell us what rpm it is at between 1-5mph. Say it's at 5000rpm at 1mph and 5300 at 5mph. Your stall would then be flashing 5000-5300rpm on launch.

This is the best way to determine if you have any more room it can flash too if you were to add nitrous.

Thanks. I will have to get a new log. I had all my logs on my laptop that is now not working. It has been a while since I have done anything to this car. It has probably been 4 years and I have forgotten a lot of things since then.

FWIW, I sprayed a 150 shot on my PT4400 a few years ago. It was a bolt-on car with 4.30 gears and 3550 lbs. The 4400 wasn't ideal but it worked pretty good even with my low 6400 rpm limiter. I was running 12.3x's on motor and 10.9x's on the bottle at the time. I did use a lock up switch in 3rd gear to bring the rpm's back down because of the loose stall, that picked up 2-3 mph for me if I remember correctly. Hope this helps!

I have done it, it worked alright. Might give up some rpms on the top end tho. Probably have to shift higher as well.

10" vert-I really don't think spraying a 150 shot thru it will affect the stall speed to the extent that you will run out of rpms. I say go for it.
I'd bet its not even stalling at 4400.
I wouldn't mind seeing 28" tires on the car.

130mph I was at 6700rpm with 26" tire if that tells you anything

I'm going to try to get some new logs Tuesday if it doesn't get rained out.

I run 1/8 mile. I probably won't have to worry about topping out. Right now I'm hitting 96mph.

I found an old log from last year on my other computer. When I floor it, it pretty much goes straight to about 5100 (1st .3 seconds) and then to 6200 (next 1.0 second) and then stays between 6200-6700 for the rest of the run. It only its 6700 for a short fraction of a second. mostly it stays below 6500

I am shocked it's flashing that high. Very surprised. That little motor of yours has some balls. :D
Well now that you know what it's doing N/A-I would put the spray to it, log it and just get off the throttle when you run out of rpms. This will give Yank valuable info when you send it out for a stall adjustment.
You may still "get away" with it the way it sits but it may need a re stall or a gear change to keep it where your need it rpm wise.
Good stuff.

Manual lock-up switch will be your friend! But it will also test your parts, it's hard on the converter and trans.