Tranny cooler update

[Htrlman1]

Since I've had my bumper off for 2 weeks I decided to add a tranny cooler since I'm going to do the j mod. I did get my under drive pulley's in but I'm still debating if I want to put the crankshaft one on.

And no I promise that isn't rust on the cross over

 

[quickblue302]

Where and how did you mount your cooler? I have a bnm 24k, is your trans fluid still going to the rad then the cooler or straight to the cooler?

 

[Markviiiedrea]

I perfer to intstall it in series with the stock cooler.

 

[NetKeym]

I can promise you right now, with that big pulley on your alternator, if you put the under drive crank pulley, your alternator will NOT keep up with your cars needs.

It's easy to test, check your battery voltage with the car not running - should be around 12.5v.

Start the car, let it idle down to warm idle (not cold idle because it idles higher while warming up) and check the voltage again. Should be in the 13-14.x volt range.

When I did my March underdrive crank pulley on mine, the voltage was 11 something and that was without the lights on. With lights on, it dipped in the 10s.

I had to put the March 110 pulley (very tiny) to get the alternator to keep up and charge properly (and I had to modify the pulley and case to get it to line up).

 

[dnsherrill]

Since I've had my bumper off for 2 weeks I decided to add a tranny cooler since I'm going to do the j mod. I did get my under drive pulley's in but I'm still debating if I want to put the crankshaft one on.

And no I promise that isn't rust on the cross over

my crossover tube has some rust on the outside, are these known to develop a pinhole/leak?

 

[Htrlman1]

Where and how did you mount your cooler? I have a bnm 24k, is your trans fluid still going to the rad then the cooler or straight to the cooler?

Since I had my bumper off I just slipped it in front of the ac condenser. It's a 20,000 btu cooler and I just used the mounting kit that comes with the Hayden rapid cool. I took the lines out of the radiator and bought some tubing and just ran it to the cooler.

 

[Htrlman1]

I can promise you right now, with that big pulley on your alternator, if you put the under drive crank pulley, your alternator will NOT keep up with your cars needs.

It's easy to test, check your battery voltage with the car not running - should be around 12.5v.

Start the car, let it idle down to warm idle (not cold idle because it idles higher while warming up) and check the voltage again. Should be in the 13-14.x volt range.

When I did my March underdrive crank pulley on mine, the voltage was 11 something and that was without the lights on. With lights on, it dipped in the 10s.

I had to put the March 110 pulley (very tiny) to get the alternator to keep up and charge properly (and I had to modify the pulley and case to get it to line up).

Thanks I wonder if by using the water pump and alternator pulley will help or will the performance stay the same as stock or am I gaining anything?

 

[Htrlman1]

my crossover tube has some rust on the outside, are these known to develop a pinhole/leak?

No, at least I haven't heard of it let

 

[KStromberg]

Thanks I wonder if by using the water pump and alternator pulley will help or will the performance stay the same as stock or am I gaining anything?

If you never changed out the crank pulley, you shouldn't have even done the pulleys at all. Some guys will leave all the pulleys alone and just do the crank pulley, because that's where all of the gains come from.

 

[NetKeym]

The bigger water pump pulley helps a little, but combined with the smaller crank pulley helps a lot more! If you really want to help, get an electric WP346S Meziere pump with the March 5" fluid crank pulley (then you also need the March 110 alternator pulley or a bigger alternator).

Kirk is right, a better gain is from the crank pulley because then you affect ALL the accessories, not just one.

 

[driller]

Just don't hit the rev limiter with the smaller alternator pulley or you will over-rev the alternator and it will meet an early demise.

 

[KStromberg]

Just don't hit the rev limiter with the smaller alternator pulley or you will over-rev the alternator and it will meet an early demise.

Hitting the 7200 rpm rev limiter on my car after the dyno was the beginning of that alternator death for me. The alternator on the stock pulley cussed at me on the 1-2 shift by flickering the battery light at me. I can't imagine what would've happened with a smaller alternator pulley. I probably would've spun the alternator bearings right on the spot. LOL I will say it was the original 151K mile alternator when it finally started screeching at me.

 

[NetKeym]

Just don't hit the rev limiter with the smaller alternator pulley or you will over-rev the alternator and it will meet an early demise.

I have revved my engine to 7K several times with that little pulley which is spinning it a little over 20000 rpm. They are supposed to be able to handle that and mine has been fine (which is a junk yard alternator I pulled at a u-pull-it about a year ago).

Kirk, I would imagine yours was gonna screech anyways - a dry bearing is a dry bearing at any rpm...