Converter flash

junior barns · 07-23-2021, 10:35 PM

Does a gear change affect converter flash ? Say going from 5.13 to 4.88 or 4.56 to 5.13

Gmirza · 07-24-2021, 08:24 AM

Yes it will. Not a lot, but it will change. It’s just like adding weight. Everything being the same the converter will flash higher with 4.56 than a 5.13. You may not see much change either way with 4.88.

junior barns · 07-24-2021, 10:19 AM

Thanks

Jeff Stout · 07-24-2021, 10:30 AM

I went from a 4.30 to 4.88 and lost 300 on converter.

Stan Weiss · 07-24-2021, 10:42 AM

Quote:

Originally Posted by Jeff Stout

I went from a 4.30 to 4.88 and lost 300 on converter.

Jeff,
How many did the slippage change on the top end?

Stan

Adger Smith · 07-24-2021, 05:07 PM

A different low gear Trans ratio will change stall but not the % slip on top end.
A rear gear will change both stall on the leave and slip down track.

junior barns · 07-24-2021, 10:22 PM

Adger, in your experience How much will it change going from 2.52 to a 2.75 1st gear?

junior barns · 07-24-2021, 10:35 PM

Quote:

Originally Posted by Jeff Stout

I went from a 4.30 to 4.88 and lost 300 on converter.

Thanks Jeff. What I was looking for on rear gear changes.

Adger Smith · 07-24-2021, 11:51 PM

Jr, Can't really put a number to it. too many variables. small engine vs large engine,... where in the Tq curve the original stall was, ect. Each application varies. Change the gear, check it with your original converter and make changes as necessary. Like it has been said before... change one thing at a time and test. Your new gear may not like the stall the other set up liked. Don't forget about the low to second % gear drop may change. That may be where you need some help from a converter. Good luck Test, Test...

Jeff Stout · 07-25-2021, 09:48 AM

With gear change the data logger showed the finishline lock up went from 6.5 to 5.5. I liked that part but not the .05 loss on 60ft.

07-23-2021, 10:35 PM	#1
junior barns Senior Member Join Date: Jun 2006 Posts: 539 Likes: 11 Liked 20 Times in 14 Posts	Converter flash Does a gear change affect converter flash ? Say going from 5.13 to 4.88 or 4.56 to 5.13

07-24-2021, 08:24 AM	#2
Gmirza Member Join Date: Dec 2018 Location: Massachusetts Posts: 156 Likes: 170 Liked 210 Times in 82 Posts	Re: Converter flash Yes it will. Not a lot, but it will change. It’s just like adding weight. Everything being the same the converter will flash higher with 4.56 than a 5.13. You may not see much change either way with 4.88. __________________ George Mirza D/SA 1236 ‘71 Duster 340

07-24-2021, 10:19 AM	#3
junior barns Senior Member Join Date: Jun 2006 Posts: 539 Likes: 11 Liked 20 Times in 14 Posts	Re: Converter flash Thanks

07-24-2021, 10:30 AM	#4
Jeff Stout VIP Member Join Date: Dec 2001 Location: phoenix Posts: 1,409 Likes: 53 Liked 655 Times in 255 Posts	Re: Converter flash I went from a 4.30 to 4.88 and lost 300 on converter.

07-24-2021, 05:07 PM	#6
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,348 Likes: 434 Liked 677 Times in 261 Posts	Re: Converter flash A different low gear Trans ratio will change stall but not the % slip on top end. A rear gear will change both stall on the leave and slip down track. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 07-24-2021 at 05:09 PM. Reason: SP+ Add

07-24-2021, 10:22 PM	#7
junior barns Senior Member Join Date: Jun 2006 Posts: 539 Likes: 11 Liked 20 Times in 14 Posts	Re: Converter flash Adger, in your experience How much will it change going from 2.52 to a 2.75 1st gear?

07-24-2021, 11:51 PM	#9
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,348 Likes: 434 Liked 677 Times in 261 Posts	Re: Converter flash Jr, Can't really put a number to it. too many variables. small engine vs large engine,... where in the Tq curve the original stall was, ect. Each application varies. Change the gear, check it with your original converter and make changes as necessary. Like it has been said before... change one thing at a time and test. Your new gear may not like the stall the other set up liked. Don't forget about the low to second % gear drop may change. That may be where you need some help from a converter. Good luck Test, Test... __________________ Adger Smith (Former SS)

07-25-2021, 09:48 AM	#10
Jeff Stout VIP Member Join Date: Dec 2001 Location: phoenix Posts: 1,409 Likes: 53 Liked 655 Times in 255 Posts	Re: Converter flash With gear change the data logger showed the finishline lock up went from 6.5 to 5.5. I liked that part but not the .05 loss on 60ft.