Dmoney

iTrader: (22)

I need a converter that is 90% N/A, and 10% Nitrous 150-200 at events only. I currently have an old TCS 4200 2.7str that is getting weak and it's time for something new. What are you stroker guys running. I need something that matches well with my setup. 484rwhp 423rwt locked, 3.73 gears, new M/T DR's 275/50/15 on draglites. I've only done a few shake down runs and went 11.40 at 121MPH w/ a spinning (no track prep) 1.56 60ft on M/T E.T. streets on stock 16' rims. Do I need to change my gears, tire size Ect..............

Top Fuel

iTrader: (8)

I'm assuming you have a 4l60e, if so Yank and Circle D would be the 2 places I would be calling to spec out a converter. With a 402 and a 3.06 first gear there is no way you need 2.7 str. Your current converter is prolly eating a ton of hp on the big end. Do you happen to know what your raceweight is?

TXCAMSS

iTrader: (60)

For all out ET we run a Circle D 5C custom 4900-5000 stall converter that hits hard, but is surprisingly streetable. We have pulled our best 60ft of 1.29 and average 1.31-1.33s. We are 100% NA and running 93 octane pump gas, but this TC would handle the bottle well. We shift at 6600 and it drops to 5600 between shifts.

For bracket racing on sub-parr tracks we run a Circle D 4C 4000-4200 stall. It's very efficient and feels good and tight for street driving yet it still pulls 1.39-1.42 60fts. It has less STR and hooks pretty much any where and any time.

These work well with our 408 stroker set up. Some people like running a bigger TC and yeah we could probably net a little better ET, but I'd bet it would be a fractional gain and require us to spin the engine higher. Not worth it to me really.

I did try a PT4000 and we blew through it on motor.

I hope this helps some.

Dmoney

iTrader: (22)

That would be great if I could keep a 4000-4200 stall and use the gas every once in a while. What's the best STR to have when you use it more for N/A than the gas???? I know the higher for N/A and lower for nitrous. Where is the compromise???? I really live for N/A, but the gas is for those rare races.............

TXCAMSS

iTrader: (60)

The 4C would be ideal. It would be custom tailored to your combo, but our set ups are close depending on your race weight. I'm not a nitrous guy, but I'm guessing a 2.2-2.4 STR would be a good balance. You got a big shot and I think the 4C will like it

Give Chris a call with all of your info and he'll hook ya up.

DrkPhx

iTrader: (15)

TXCAMSS - How is the looseness and streetability compared the PT4000 and what do you mean by "blew through it"? I run the PT4000 with good results (1.48 60-ft on DR's) and no problems. I was thinking of going to slightly bigger converter, but I do street drive it quite a bit. BTW - I'm n/a.

TXCAMSS

iTrader: (60)

Don't get me wrong, the PT series is great, but with our higher HP/TQ we would hang at at high rpms down the track and had almost no shift extension. The power wasn't getting to the ground. It would be the same as someone putting a 300 shot on a 450hp H/C car that had a loose ATI 5500 stall. It's just not gonna work well.

If you have 800-1100 rpm of shift extension you are fine IMO. I have had several PT series converters that worked good with our mild H/C combo, but that was before we started making a bit more power. The PT series is very loose and designed to be that way. My converter is much tighter feeling. I can footbrake it to 2500 comfortably and force it to about 3000 if that helps any.

A properly matched converter is one of the most critical choices that determines the potential of a given set-up in an automatic tranny car. It's like cylinder head selections. You just don't want to be cutting corners in these departments, if you expect great results. They can make you or break you quick. I don't like to leave much on the table and if I do, there is usually a good reason for it.

G/L

DrkPhx

iTrader: (15)

Thanks for the info. I was shifting at 7000 rpms and the shift extension was 5900 rpms. I'm currently going through the motor and switched to a slightly bigger cam, ported FAST and reworked heads. I'm debating on leaving the converter alone or bumping up to a 4400 stall to maximize the setup.

waterbug1999

iTrader: (3)

Get one... I wanna see how it does.

import slayer

I think that I'm having the same problem. I use the PT 4400 and when I was at the track it seemed like all the power was not getting to the ground.