josh2002-ws6

iTrader: (98)

Okay, just looking so see what you guys think it will run?
I am running a forged 347, diamond custom 10cc nitrous pistons. The heads are from AFR, 230's and the cam is solid roller and will be around 244/252 673/673 at 113lsa. I am running a Edelbrock victor Jr. with a Scorpion 4 barrel throttle body. The nitrous kit is 2 stages of direct port, 250 out of the hole and 200 in the second stage Full suspension and full bolt-ons. It is being run thru a 4L80 with trans-brake and lock-up and a 9" full spool with 4.11's.. The car weights about 3000lbs. I will be running a 10.5 by 28" drag radial.

camscam02

iTrader: (21)

Should run in the 8's if you are actually gonna spray that much and the converter is correct

josh2002-ws6

iTrader: (98)

Oh yeah, forgot to add that the compression is 12.5-1 and I will only be running c116 in both the standalone and regular tank. The converter might be my only problem, I bought it used and am not sure how it will react to that much spray. It is a precision 5 disk with the lock-up. If the converter is the only thing that will hold me back, then I will just send it back to precision to get restalled and loosened or tightened.

camscam02

iTrader: (21)

Why spend all that money and skip out on one of the most important parts of a build? Get a converter built now for your combo or you're just wasting your time and all the money you built on that motor

Noyzee

iTrader: (37)

coundnt have said it better myself.

josh2002-ws6

iTrader: (98)

I got the converter with the 4L80 and both only cost me 1,200 dollars. I couldn't pass up that deal. The converter alone costs more then that. The converter will be easy to have redone if needed. I agree with you both, but considering the circumstances. Anyways, the converter came from a nitrous built car with a lot of spray.

Noyzee

iTrader: (37)

you could probably get numbers off the converter and they can give you the info you need. they may say try it or send it back. my guess is they have a build sheet on it and can tell you what it will do.

josh2002-ws6

iTrader: (98)

That is a good idea, I will have to check. Thank you.

Fbodyjunkie06

iTrader: (10)

As Cam said the converter is the most important piece of the puzzle and it isn't as easy a lot of the time as loosening it or tightening it.

It may be too big of diameter or too small of a diameter for them to adjust the fin angle properly and still be efficient and work like it should.

Do as Noyzee said and find out the specifics on the converter before you even try it so that way you don't have to fight a 200+ pound transmission when you find out it doesn't work at all the way it should and need to have it re-done.

josh2002-ws6

iTrader: (98)

I talked to Precision yesterday and gave them the invoice number. The guy said it will do great for my application.

dnkynrbk

iTrader: (34)

Those gears are going to be wrong for that set up I bet you will need 3:73s I bet. You are going to run.outa heat w that much spray.

dnkynrbk

iTrader: (34)

Dam auto correct. Its gear not heat lol

Noyzee

iTrader: (37)

do not forget, solid roller. id have to do some math, but i used to spin my race motor to 8500 so it might be close depending on shift points etc.

josh2002-ws6

iTrader: (98)

I also checked all of that with the guy from Precision. He told me the 4.11 gears would be fine. At first I am only gonna spin this motor to 8k and then work my way up.

Noyzee

iTrader: (37)

i think you will be close at 8,000 depending how fast you go. but if your looking to go 153-156 (just saying) you will prob be close at 8000 depending on converter slip. i know right now with 3.73 in my car, 28 inch tire spinning to 7400 ish i run threw right around topped out at 145 mph

be close

dnkynrbk

iTrader: (34)

Post some pics up if you get a chance of the car and set up.

josh2002-ws6

iTrader: (98)

If I switched to a 29" tire, would that help or hurt my gear ratio?

As I am currently deployed in Saudi Arabia as a contract Firefighter for the Air Force, I will not be able to get any pictures until sometime in September. I will take some then tho.

Noyzee

iTrader: (37)

well a 29 inch tire will allow for more top end, some people love the 29 or 30 inch tire. i myself like the 28 inch.

http://www.catherineandken.co.uk/sti/tyres.html

try this, it should help you figure out how close you will be. its not perfect but it should help

josh2002-ws6

iTrader: (98)

With the setup I have now. The 28" tires, 4.11 gears, 4L80 transmission, and spinning the motor to 8k, I should top out at 162 mph in 3rd gear according to that link.

camscam02

iTrader: (21)

sounds like our converters are pretty close on the top end. Thats about where I am with the same rear setup and tire. 145 crosses right at 7400 for me.

but OP are you planning on locking up the converter in high gear with that setup?