xdanny510x

set up

99 ls1 with a th400 with a hughes 4400
tsp 408 lq9/ls3 based stroker 11;8;1 compression.
moser 12 bolt with 4;10s... gonna be changing out for 3;73
27in tall tire
my cam is a 230/244/612/598/114lsa

chevelledave

iTrader: (5)

probably would help to know your stall??
rpm range would help as well...
tire size...
compression

xdanny510x

sorry about that man i added it to the thread!

JL ws-6

iTrader: (50)

Nope. don't change that 3.73 in either, if you want n/a performance you need to head in the other direction, 4.30 with a 27 inch tire works out pretty good, 4.56 with 28's works (hooks) better....

I ran a 5200 converter when I was running my car n/a, and with the 408 I have in my sig, if it doesn't sell and ends up in the car, it's getting a 6200 8 inch converter fwiw...

Tight converter and an n/a car don't work together, at all, regardless what a dyno sheet or any of that tells you.


If you want to change something, change that camshaft. You probably need something more like a 250/260 and bump the lift up in the 620ish range, and drop the lsa down to about 110. If, you're after n/a performance.

Pro Stock John

iTrader: (34)

I'd say it's fine but it will depend on how efficient it is. I had an 8" 4800 that worked good but tried a Vig that also went to 4800 on the 'brake and the car slowed down 3 tenths on motor and 3 on spray...

xdanny510x

one more question.. do yall think i would run out of gear before i cross the finish line?

JL ws-6

iTrader: (50)

No, unless you're leaving the rev limiter at 7000 or less you should be fine.

Even at 127 on motor I never went thru at more then 7100

ls1curt

iTrader: (31)

what gears did you have jl?

dustin99a4

iTrader: (17)

Any video with decent audio of it going down the track? How many RPMs does it drop between shifts? Is the converter advertised as a 4400 or it that what is does on the brake?

JL ws-6

iTrader: (50)

4.10's in it when I ran it on motor but it needed 4.56's to really go after the n/a performance aspect of things.... had I left it n/a I would have went to 4.56 for sure. The 3.73's went in when I started spraying the car not because I was running out of gear, but I was swapping in a spool, and it was an attempt to keep the nose down, which didn't work.

It went thru the traps at 127 at way less then the 7400 it made good power to. When I shifted it at 7000, the shift light never came on at the top end of the track.. and I know it would have been faster shifting it a little higher, especially with a better intake then the fast on it.

BlackScreaminMachine

iTrader: (17)

Trust in JL, he does know what he is talking about. IMO thats why its called testing and tuning as stall converter speed and gearing should always be the last thing decided in a combo and most times there maybe 2-3 swap outs, not including tire changes to dial it in. This has been echoed by more then one knowledgeable person.

xdanny510x

If im addin some spray then? What gears to with?
Btw ty all for the input!

JL ws-6

iTrader: (50)

4.10 with nitrous, unless you're putting more then 450 to it, in that case you will need the 3.73 to stop running out of gear

ls1curt

iTrader: (31)

so will 4:10's still a trap of around 140 with a 28" tire?

JL ws-6

iTrader: (50)

Yea no problem. I did it with my car before I swapped the spool in, and I had no issues. You will be around the 7000 to 7200 mark, depending on how effecient your converter is.

If you got a converter fron Lenny.. it won't be a problem that I'm sure of.

ls1curt

iTrader: (31)

okay good. JL i think im gonna just run my yank this year and see how it is n/a and when i get serious about the spray i will have one built for my car. b
edit: just checked out them converters and they do look pretty slick