converter help

rustbucket79 · 11-06-2011, 11:55 PM

Playback tach is a great investment. I could not tell you what the converter flashes to, or where the needle sweeps during a shift during a pass, but I sure can show you back in the pits. BTW a high stall with a low break away RPM IMHO is the sign of a quality converter. (assuming it still hit's the required flash RPM) A cheap stall will slip a bunch and give you a higher easy stage RPM. (like you're pal's)

A xxxx stall converter is dependant on so many things. (well, everything) I had a 4500 stall custom built for my first personal performance engine in the mid 90's, a 331 Chev. I could footbrake it to about 3800, but not reliably. That same converter I could footbrake at 4250, but it was a very mild 350. That same converter would flash to 5600 behind my first 408 small block.

A trans brake would eliminate your issue and give you some starting line tuning. I guarantee you could benefit from additional rear gear.

Bob Mulry · 11-07-2011, 04:23 AM

How about just rolling down the return road in high gear and whacking the throttle......

The tires will not spin in high gear and you can easily read the flash on the tach....

I know, I know not as high tech as a data logger, but much cheaper....

art leong · 11-07-2011, 09:56 AM

Quote:

Originally Posted by Bob Mulry

How about just rolling down the return road in high gear and whacking the throttle......

The tires will not spin in high gear and you can easily read the flash on the tach....

I know, I know not as high tech as a data logger, but much cheaper....

My datalogger came as a part of my ECU. And the whole setup didn't cost as much more than an MSD box, distributor, and 2 step.

cad · 11-07-2011, 02:09 PM

Mike,
Sounds like the converter may not be made exactly for your combo.
My 385, th350, 4.88s, aftermarket disc/ stock rr drum, 29x9, ATI 4600 treemaster allows me to setup on the 2-step to about 3200 before the car will roll. I do have to set the brakes harder than normal...I footbrake on a regular basis to hit the tree.
It will 60' 1.48-1.50.
I'd call Charlie Plott @ ATI or your personal preference for input as the camshaft and car weight makes a big difference.

greg fulk · 11-08-2011, 03:09 AM

My "bracket" / street/strip Camaro is about the same... it has a 9" 4200 converter ( in high gear anytime you "hit it" it goes to 4200 & pulls) but the MAX it will footbrake is 2700....it feels better around 2200. My Cutlass is almost the same too. Oh the Camaro has 28x9 Drag Radials with 4.11 gears (12.40s)

Mike W · 11-09-2011, 09:32 PM

Quote:

Originally Posted by cad

Mike,
Sounds like the converter may not be made exactly for your combo.
My 385, th350, 4.88s, aftermarket disc/ stock rr drum, 29x9, ATI 4600 treemaster allows me to setup on the 2-step to about 3200 before the car will roll. I do have to set the brakes harder than normal...I footbrake on a regular basis to hit the tree.
It will 60' 1.48-1.50.
I'd call Charlie Plott @ ATI or your personal preference for input as the camshaft and car weight makes a big difference.

Sounds very similiar to my combo, what are you going thru the traps at with 4.88s?

1.48 and 1.50 VERY nice 60ft......... my best is 1.52 with 4.10s

cad · 11-10-2011, 03:36 PM

Between 7200 & 7400.

Mike W · 11-10-2011, 08:27 PM

Cad What kinda of times do you turn? I was thinking if going to 4.56 this year. Thanks Mike

11-06-2011, 11:55 PM	#1
rustbucket79 Junior Member Join Date: Aug 2004 Location: Canada Posts: 45 Likes: 0 Liked 0 Times in 0 Posts	Re: converter help Playback tach is a great investment. I could not tell you what the converter flashes to, or where the needle sweeps during a shift during a pass, but I sure can show you back in the pits. BTW a high stall with a low break away RPM IMHO is the sign of a quality converter. (assuming it still hit's the required flash RPM) A cheap stall will slip a bunch and give you a higher easy stage RPM. (like you're pal's) A xxxx stall converter is dependant on so many things. (well, everything) I had a 4500 stall custom built for my first personal performance engine in the mid 90's, a 331 Chev. I could footbrake it to about 3800, but not reliably. That same converter I could footbrake at 4250, but it was a very mild 350. That same converter would flash to 5600 behind my first 408 small block. A trans brake would eliminate your issue and give you some starting line tuning. I guarantee you could benefit from additional rear gear.

11-07-2011, 04:23 AM	#2
Bob Mulry VIP Member Join Date: Apr 2002 Location: Coarsegold, CA Posts: 1,016 Likes: 57 Liked 320 Times in 102 Posts	Re: converter help How about just rolling down the return road in high gear and whacking the throttle...... The tires will not spin in high gear and you can easily read the flash on the tach.... I know, I know not as high tech as a data logger, but much cheaper.... __________________ Bob Mulry 7516 STK A & M Motorsports

11-07-2011, 02:09 PM	#4
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 702 Likes: 202 Liked 91 Times in 51 Posts	Re: converter help Mike, Sounds like the converter may not be made exactly for your combo. My 385, th350, 4.88s, aftermarket disc/ stock rr drum, 29x9, ATI 4600 treemaster allows me to setup on the 2-step to about 3200 before the car will roll. I do have to set the brakes harder than normal...I footbrake on a regular basis to hit the tree. It will 60' 1.48-1.50. I'd call Charlie Plott @ ATI or your personal preference for input as the camshaft and car weight makes a big difference.

11-08-2011, 03:09 AM	#5
greg fulk VIP Member Join Date: Jan 2003 Location: jackson Posts: 1,165 Likes: 0 Liked 5 Times in 3 Posts	Re: converter help My "bracket" / street/strip Camaro is about the same... it has a 9" 4200 converter ( in high gear anytime you "hit it" it goes to 4200 & pulls) but the MAX it will footbrake is 2700....it feels better around 2200. My Cutlass is almost the same too. Oh the Camaro has 28x9 Drag Radials with 4.11 gears (12.40s) __________________ Greg Fulk 308 308X P/SA "ALL AMERICAN"

11-10-2011, 03:36 PM	#7
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 702 Likes: 202 Liked 91 Times in 51 Posts	Re: converter help Between 7200 & 7400.

11-10-2011, 08:27 PM	#8
Mike W Junior Member Join Date: Sep 2009 Posts: 17 Likes: 0 Liked 0 Times in 0 Posts	Re: converter help Cad What kinda of times do you turn? I was thinking if going to 4.56 this year. Thanks Mike

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