Stall converter help/opinions

[junior]

I bought a c4 that came with a 4500 stall and wanted some of the gurus input on it, personally i think its a little much but ill be the first to say i know nothing about what im talking about.

Set up is as follows
408w
Victor jr heads
.600+ cam
Art carr c4 with brake
(as of now)
3.73's
28" tire

Car is a nitrous car and again for now will see a 150 on a plate

Car will be driven to work once in a while (i work 2miles from home) and will be trailered to track

Please help me out, and share yalls infinite wisdom

[robert]

I think you would also want to add:
if car will be street driven or just track use.

[slow55]

Does it actually go 4500 on the brake or is that just what it's suspected to be?
On motor I wouldn't worry about it but for nitrous I personally would want something a little tighter.

You already have it so might as well put it in and give it a try.

[junior]

Does it actually go 4500 on the brake or is that just what it's suspected to be?
On motor I wouldn't worry about it but for nitrous I personally would want something a little tighter.

You already have it so might as well put it in and give it a try.

Board member that sold it to me said it was a 4500 i presume on break but not sure i can problaly get a hold of him and ask,

So on motor its good but not on spray,

Can you splain

[slow55]

Board member that sold it to me said it was a 4500 i presume on break but not sure i can problaly get a hold of him and ask,

So on motor its good but not on spray,

Can you splain

On motor it will you get the rpms up faster and make better use of the motors na power

On juice it's going to be making instant power and you want something that's tighter and locks up faster to make better use of the power, if not it's going to rev to fast and probably run out of power before you make to the end.

Maybe not with those gears but more than likely it will

[greenbullitt]

4500 on brake or not and 4500 behind what? 2.3? 302? 427? what power? torque affects stall

[fordracing19]

Sounds like fun JR

[Rustang]

I doubt you will get 4500 out of it. I've seen plenty of converters rated high, and most can't get there, whether it's due to brakes won't hold, or not enough HP to stall it up. Now with the trans brake, it may go higher. Nitrous will produce more HP, and will make it stall higher due to it. I have a 5500 converter in mine, and it goes to 4800, I don't make enough for it to go higher, and I know the old owner could get this much and more out of it.

[LS1Goat]

Board member that sold it to me said it was a 4500 i presume on break but not sure i can problaly get a hold of him and ask,

So on motor its good but not on spray,

Can you splain

Take it from me. Make sure you run an external trans cooler with a fairly big stall. Drivablility shouldn't be a major issue since you stated you didn't plan on driving it much. All it's going to do is reduce your gas mileage and make a lot of heat, especially if you are driving around town in the summer time. I have a 10" 3,800 with 4.56 gears and it cruises around town just fine. Some people have misconceptions about torque converters. A well built torque converter stalled reasonably high will still retains close to normal drivability. There is also a question of whether the converter was built for nitrous or n/a application. Yours is probably a 9.5 Just keep an eye on those trans temps on that C4. Even consider running a fan + the external cooler, especially if you plan on doing any daily driving. And even if you can get 4,500 on the brake, you'll be fine if bump up your shift points a bit.

You're lucky with the C4. With my 4R70W, I had to put in bottle of LubeGard and significantly bump up my line pressure to make a clean 3rd to 4th (o/d) shift without shudder. This being related to heat and the higher torque multiplication factor over stock. Electronic valve body tranny's are a PITA.

[ceyko]

You do WOT shifts to OD with the 4r70w? I had the shudder thing too after accidentally doing it while having a spirited run with a 03/04 cobra with a blower on my car. Adjusting line pressures is also a good move.

Anyway, I fully second the external cooler. Although, I'm not really sure that's 100% required for just 1/8 or 1/4 mile fun. It certainly can't hurt though - but for daily driving - yeah, it'll help a lot.

[LS1Goat]

You do WOT shifts to OD with the 4r70w?

Never.

I had the shudder thing too after accidentally doing it while having a spirited run with a 03/04 cobra with a blower on my car. Adjusting line pressures is also a good move.

The shudder would occur around 40 mph or so whenever the converter tries to lock up. I corrected this by adding 10% pressure on 3 - 4 shift, 1 bottle of LubeGard, and installing a good external trans cooler running in line with the stock cooler in radiator. It dropped my trans temps by more than 20 degrees. Again, caused from the higher tq multiplication and the tune file not being tweaked as yet regarding lock up strategy.

Secondly, if you get shudder with an all stock 4R70W, it's just because the oil has broken down and needs to be changed. The simple fix is to do a tranny flush and toss in a new filter. And if you install an ext. trans cooler, you'll probably never experience it again.

[ceyko]

Never.

Secondly, if you get shudder with an all stock 4R70W, it's just because the oil has broken down and needs to be changed. The simple fix is to do a tranny flush and toss in a new filter. And if you install an ext. trans cooler, you'll probably never experience it again.

Lol, I had an external cool, line pressures tweaked and it still happened after a fresh flush. The car only had like 22K on it too at the time. Still worked just fine generally, but that was the only suspect part of the car.

Anyway, wanted to autox - did not want to do that with an auto, then had twins and other priorities. Fun cars though.