60ft, 330ft help

pfordamx · 07-20-2017, 11:24 PM

engine stroke is 3.85

Mike Rietow · 07-20-2017, 11:56 PM

Torque converter like the other man said. I have a 23* sbc 3.875 stroke crank with a set of cylinder heads that flow 326 @0.700lift. 3250 pd car goes 1.27 60ft N/A with a 8.94 starting line ratio on a 28 x 10.5 bias M/T. Your starting line ratio is 10.05. if your'e optimum shift is at 7600rpm the observed stall should be around 6200 with a 3sp transmission, maybe a cats whisker more. I wouldnt change the gear without a converter adjustment. No way, it won't go down consistently.

Hacksaw · 07-21-2017, 08:39 AM

Pfordamx: I don't mind trying to help out a racer that has a problem. Just think you need to go down the track many more times and tune what you already have. You seem too quick to start jumping into parts swapping. Flog what you have, evaluate, then make one change. This takes time and patience. Good luck.

HP HUNTER · 07-21-2017, 09:58 AM

Rims
Tires
TQ Converter
Gears
Trans

425 HP runs 7.0 @ 3250. 1320 divided by 124.7 = 10.58.

Alan Nyhus · 07-21-2017, 10:52 AM

Pfordamx- No doubt you need a convertor and gear change to get your 60 fts. to improve. One thing you may want to try....stay off the two step and leave at 2000-2200. This may let the convertor 'work' a bit harder and let it flash a bit higher...might give you some insight before you spend any cash.

Also, be aware that Stockers and Super Stock cars have very aggressive convertors. You may, or may not, want that same aggressive convertor in a bracket application. Spending some time correlating similar et's/60 fts. for cars that run similar times to yours and looking at the 60's for similar e.t.'ing Stock/SS cars can be pretty revealing.

P.S. - AMX's are 'way cool.....

pfordamx · 07-21-2017, 01:31 PM

I've been intending to test it off the foot brake at a low rpm like 2200 and to raise it up to 4500 or 5000 just for testing purposes. the main thing were running into is we built a car with the idea of a bracket car then found a local heads-up series that has an NA class that the car falls very easily into rules wise and its pretty enjoyable, but it leads us to look for more and more performance where if it was just a bracket car 10.70s wouldn't be too bad in a local NO E class. but the car has yet to be bracket raced except for one index race that we used as more a test and tune then really trying to run the #

CFMCNC · 07-23-2017, 02:53 PM

A trip to an engine Dyno will -would save lots of time and money.Important data like peak Horsepower RPM and peak Torque RPM would be used to choose rear gears and torque convertor .Also would know actual HP output.Bill C.

07-20-2017, 11:24 PM	#1
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 215 Likes: 3 Liked 7 Times in 5 Posts	Re: 60ft, 330ft help engine stroke is 3.85

07-20-2017, 11:56 PM	#2
Mike Rietow Junior Member Join Date: Apr 2017 Posts: 93 Likes: 19 Liked 30 Times in 16 Posts	Re: 60ft, 330ft help Torque converter like the other man said. I have a 23* sbc 3.875 stroke crank with a set of cylinder heads that flow 326 @0.700lift. 3250 pd car goes 1.27 60ft N/A with a 8.94 starting line ratio on a 28 x 10.5 bias M/T. Your starting line ratio is 10.05. if your'e optimum shift is at 7600rpm the observed stall should be around 6200 with a 3sp transmission, maybe a cats whisker more. I wouldnt change the gear without a converter adjustment. No way, it won't go down consistently. Last edited by Mike Rietow; 07-21-2017 at 12:02 AM.

07-21-2017, 08:39 AM	#3
Hacksaw Senior Member Join Date: Sep 2016 Posts: 884 Likes: 209 Liked 312 Times in 175 Posts	Re: 60ft, 330ft help Pfordamx: I don't mind trying to help out a racer that has a problem. Just think you need to go down the track many more times and tune what you already have. You seem too quick to start jumping into parts swapping. Flog what you have, evaluate, then make one change. This takes time and patience. Good luck.

07-21-2017, 09:58 AM	#4
HP HUNTER Senior Member Join Date: Feb 2012 Location: Colorado Springs Colorado/Thousand Oaks Ca Posts: 656 Likes: 82 Liked 373 Times in 129 Posts	Re: 60ft, 330ft help Rims Tires TQ Converter Gears Trans 425 HP runs 7.0 @ 3250. 1320 divided by 124.7 = 10.58. Last edited by HP HUNTER; 07-21-2017 at 10:04 AM.

07-21-2017, 10:52 AM	#5
Alan Nyhus VIP Member Join Date: Dec 2002 Location: Lower Dakota territory Posts: 1,180 Likes: 1,074 Liked 799 Times in 236 Posts	Re: 60ft, 330ft help Pfordamx- No doubt you need a convertor and gear change to get your 60 fts. to improve. One thing you may want to try....stay off the two step and leave at 2000-2200. This may let the convertor 'work' a bit harder and let it flash a bit higher...might give you some insight before you spend any cash. Also, be aware that Stockers and Super Stock cars have very aggressive convertors. You may, or may not, want that same aggressive convertor in a bracket application. Spending some time correlating similar et's/60 fts. for cars that run similar times to yours and looking at the 60's for similar e.t.'ing Stock/SS cars can be pretty revealing. P.S. - AMX's are 'way cool..... __________________ "That'll never work....."

07-21-2017, 01:31 PM	#6
pfordamx Member Join Date: Sep 2011 Location: Oklahoma City, OK Posts: 215 Likes: 3 Liked 7 Times in 5 Posts	Re: 60ft, 330ft help I've been intending to test it off the foot brake at a low rpm like 2200 and to raise it up to 4500 or 5000 just for testing purposes. the main thing were running into is we built a car with the idea of a bracket car then found a local heads-up series that has an NA class that the car falls very easily into rules wise and its pretty enjoyable, but it leads us to look for more and more performance where if it was just a bracket car 10.70s wouldn't be too bad in a local NO E class. but the car has yet to be bracket raced except for one index race that we used as more a test and tune then really trying to run the #

07-23-2017, 02:53 PM	#7
CFMCNC Junior Member Join Date: Apr 2012 Location: Somwhere in NJ Posts: 72 Likes: 4 Liked 3 Times in 3 Posts	Re: 60ft, 330ft help A trip to an engine Dyno will -would save lots of time and money.Important data like peak Horsepower RPM and peak Torque RPM would be used to choose rear gears and torque convertor .Also would know actual HP output.Bill C.