Looking for converter thoughts

Barney B · 08-16-2007, 12:21 PM

I run a Hughes GM95 78C-1/4 in my dragster,(I own two of them) 548 BBC makes 840 HP, 4 link Undercover. My question is MPH. I run 7.80's at 167-168, I run 8.90's @ 165-167. I have seen same ET cars run more MPH.
Could my converter be improved to give me more MPH or is this normal?
Thanks for you thoughts, Barney

Barney B · 08-21-2007, 12:26 PM

Come on guys, some one has to have some thoughts on this. Kevin? are ya out there?
BB

Bryan Gillespie · 08-21-2007, 05:02 PM

could be converter,could also be where your cam is degreed,could also be gears,tire size .

Barney B · 08-22-2007, 08:01 AM

Bryan, thank you for your thoughts. I am thinking the converter could be improved for my combo but not sure. I run 33.5 x 17 x 16 tires and a 4.10 gear. What has me puzzled is the MPH is almost the same for wide open vs on the stop. Seems like a lot of RPM going through the traps like it has a lot of slip, right around 7400, I shif at 7000.
Thanks again, Barney

Johnny · 08-22-2007, 05:54 PM

Barney,

Looks like you run a pretty big tire on a 7.80 digger, there's nothing wrong with that, just don't expect to run with the 33/16.5/15 crowd when it comes to MPH. It looks like you are spinnin a little high in the traps. It could be converter issues, camshaft design, intake/carb, high gear clutches or lots of other gremlins. I'm no converter expert buy I would try www.selecttransmissions.com and talk to Eddie Sr./Jr. These guys are Super Comp/Gas racers that compete almost every weekend. They are in NY, a lot closer that AZ or CA. Just my two cents.

Dustin Chase · 08-22-2007, 10:26 PM

Its expensive but put a race pak in it. It will tell you what you need to know. I moved from super gas to comp elim this year. Same car. 34 chev roadster. then, 350 490 horse SBC on the stop for 2.50 9.90's at 142 to 144mph. Now so far 9,70's at 134 with a four cyl. Same weight. Car wont get out of its own way in the sixty foot. spin bog spin bog, once i get that figured out i will be faster. Without the stop on when you leave you are probably spinning the tires on the launch, even though your 60' maybe faster by a bit you are loosing your et and mph at the hit of the throttle. We are movving from a 31.5/13.5/15 to a 30/10.5/15 and should be faster. big tires are not always better.

08-16-2007, 12:21 PM	#1
Barney B Senior Member Join Date: Apr 2006 Location: Wadsworth, Ohio Posts: 510 Likes: 0 Liked 0 Times in 0 Posts	Looking for converter thoughts I run a Hughes GM95 78C-1/4 in my dragster,(I own two of them) 548 BBC makes 840 HP, 4 link Undercover. My question is MPH. I run 7.80's at 167-168, I run 8.90's @ 165-167. I have seen same ET cars run more MPH. Could my converter be improved to give me more MPH or is this normal? Thanks for you thoughts, Barney

08-21-2007, 12:26 PM	#2
Barney B Senior Member Join Date: Apr 2006 Location: Wadsworth, Ohio Posts: 510 Likes: 0 Liked 0 Times in 0 Posts	Re: Looking for converter thoughts Come on guys, some one has to have some thoughts on this. Kevin? are ya out there? BB

08-21-2007, 05:02 PM	#3
Bryan Gillespie Banned Join Date: Dec 2006 Location: Maryland Posts: 456 Likes: 0 Liked 0 Times in 0 Posts	Re: Looking for converter thoughts could be converter,could also be where your cam is degreed,could also be gears,tire size .

08-22-2007, 08:01 AM	#4
Barney B Senior Member Join Date: Apr 2006 Location: Wadsworth, Ohio Posts: 510 Likes: 0 Liked 0 Times in 0 Posts	Re: Looking for converter thoughts Bryan, thank you for your thoughts. I am thinking the converter could be improved for my combo but not sure. I run 33.5 x 17 x 16 tires and a 4.10 gear. What has me puzzled is the MPH is almost the same for wide open vs on the stop. Seems like a lot of RPM going through the traps like it has a lot of slip, right around 7400, I shif at 7000. Thanks again, Barney

08-22-2007, 05:54 PM	#5
Johnny Junior Member Join Date: Jan 2005 Location: Dirt Jersey Posts: 85 Likes: 0 Liked 0 Times in 0 Posts	Re: Looking for converter thoughts Barney, Looks like you run a pretty big tire on a 7.80 digger, there's nothing wrong with that, just don't expect to run with the 33/16.5/15 crowd when it comes to MPH. It looks like you are spinnin a little high in the traps. It could be converter issues, camshaft design, intake/carb, high gear clutches or lots of other gremlins. I'm no converter expert buy I would try www.selecttransmissions.com and talk to Eddie Sr./Jr. These guys are Super Comp/Gas racers that compete almost every weekend. They are in NY, a lot closer that AZ or CA. Just my two cents.

08-22-2007, 10:26 PM	#6
Dustin Chase Junior Member Join Date: Jun 2007 Location: Pampa Texas Posts: 31 Likes: 0 Liked 0 Times in 0 Posts	Re: Looking for converter thoughts Its expensive but put a race pak in it. It will tell you what you need to know. I moved from super gas to comp elim this year. Same car. 34 chev roadster. then, 350 490 horse SBC on the stop for 2.50 9.90's at 142 to 144mph. Now so far 9,70's at 134 with a four cyl. Same weight. Car wont get out of its own way in the sixty foot. spin bog spin bog, once i get that figured out i will be faster. Without the stop on when you leave you are probably spinning the tires on the launch, even though your 60' maybe faster by a bit you are loosing your et and mph at the hit of the throttle. We are movving from a 31.5/13.5/15 to a 30/10.5/15 and should be faster. big tires are not always better. __________________ Dustin Chase Comp 470 K/A