Re: to low gear set or not to low gear set?
[Re: dmking]
#1178608
02/14/12 11:43 PM
02/14/12 11:43 PM
|
Joined: Jul 2008
Posts: 30,440
Florida STAYcation
dOc !
The village idiot's idiot
|
The village idiot's idiot
Joined: Jul 2008
Posts: 30,440
Florida STAYcation
|
Quote:
think it will hit the tires too hard and make me spin easyer?
If your hook is on-the-edge ...it WILL DO just that.
|
|
|
Re: to low gear set or not to low gear set?
[Re: dOc !]
#1178610
02/15/12 12:10 AM
02/15/12 12:10 AM
|
Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
jamesc
master
|
master
Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
|
Quote:
what is a vert?
converter, if i was looking to spend $400 on the race car it wouldn't be for a low gear set. i assume it's a BB and you already have a 2.45 first gear. i'm no expert but do the math. say the engine has 600 lb ft of torque. i believe typical converter ratios to be around 2:1 to 2.5:1. so now you have 1500 lb ft coming out of the converter at the hit. then run that through a 2.45:1 ratio, you now have 3675 lb ft of torque. now put that in a 4.3 final drive ratio and you have 15,803 lb ft of torque at the rear axles. now obviously these numbers aren't exact and there are losses but i don't think a lower gear set would be the best way to spend $400 on your car though more information would be helpful.
|
|
|
Re: to low gear set or not to low gear set?
[Re: tubtar]
#1178612
02/15/12 01:14 AM
02/15/12 01:14 AM
|
Joined: Mar 2003
Posts: 2,512
PA
moparacer
master
|
master
Joined: Mar 2003
Posts: 2,512
PA
|
If you don't mind pulling the trans again to put the 2.45 back in after your 60 fts. get inconsistent by all means put the low first in!
273s 318s and 340s or a street car with 3.55 or higher gears maybe a low first, but any bigger cid or rear gears its a waste.
67 Barracuda street/bracket car 11.27-119
68 Dart 502 BB 8.70s-152
414 cid SB Dragster 7.65-174
|
|
|
Re: to low gear set or not to low gear set?
[Re: dmking]
#1178613
02/15/12 01:49 AM
02/15/12 01:49 AM
|
Joined: Aug 2003
Posts: 43,213
Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,213
Bend,OR USA
|
I run the mopar brand helical 2.77 low gear set in my Duster, 3450 lbs with a 518 C.I. pump gas motor with Indy SR heads, Dana 60 with 4.10 gears, M/T 10.5x31x15W slicks on ten inch rims, 1/4 Max ladder bars with double adjustable coil overs. It has ran a best of 1.43 60 ft at 9.993 at 134.5 with the air cleaner and full three inch exhaust system on to the rear bumper. Motor makes 725 HP at 6000 RPM and 710 Ft. Lbs at 4900 RPM on a DTS engine dyno, no problem in hooking the car anywhere with decent tires, low gear sets rock  
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: to low gear set or not to low gear set?
[Re: Cab_Burge]
#1178614
02/15/12 10:53 AM
02/15/12 10:53 AM
|
Joined: Jan 2003
Posts: 4,448
Phoenix, AZ
MoparBilly
master
|
master
Joined: Jan 2003
Posts: 4,448
Phoenix, AZ
|
Dennis,
I agree with jamesc that the low gearset wouldn't be the best place to put 400 at this point, but more info is needed to decide where to put it.
Is 10.5 as wide a tire as the car can handle?
"Old Indy's" Are they -1s or SRs??
What broke on the motor?
What cam is in it?
If it's a 440 with -1 heads, the combination of converter and camshaft are key. Typically less duration will allow for more torque in the usuable launch rpm.
"Livin' in a powder keg and givin' off sparks"
4 Street cars, 5 Race engines
|
|
|
Re: to low gear set or not to low gear set?
[Re: tubtar]
#1178615
02/15/12 03:08 PM
02/15/12 03:08 PM
|
Joined: Nov 2004
Posts: 951
Alliance, Ohio
Valiant_Showoff
super stock
|
super stock
Joined: Nov 2004
Posts: 951
Alliance, Ohio
|
Quote:
I opted for the low 1st gear in my 904 because I have a 3.91 cog in back and I thought it might help it get moving , but whether it works or not is yet to be determined.
It sounds good on paper........whether that translates to asphalt is going to be interesting to find out.
That's exactly my situation too. 360 powered street car with 3.91 gears on 28" tires with a 8" ATI converter. My typical 60' times are around 1.61 to 1.63 while running in the 11.70's in crappy Ohio air.
|
|
|
Re: to low gear set or not to low gear set?
[Re: MoparBilly]
#1178616
02/15/12 03:11 PM
02/15/12 03:11 PM
|
Joined: Oct 2003
Posts: 1,409
Ont. Canada
10.90 Racer
super street
|
super street
Joined: Oct 2003
Posts: 1,409
Ont. Canada
|
Quote:
Dennis,
I agree with jamesc that the low gearset wouldn't be the best place to put 400 at this point, but more info is needed to decide where to put it.
Is 10.5 as wide a tire as the car can handle?
"Old Indy's" Are they -1s or SRs??
What broke on the motor?
What cam is in it?
If it's a 440 with -1 heads, the combination of converter and camshaft are key. Typically less duration will allow for more torque in the usuable launch rpm.
|
|
|
Re: to low gear set or not to low gear set?
[Re: 10.90 Racer]
#1178617
02/15/12 07:31 PM
02/15/12 07:31 PM
|
Joined: Apr 2011
Posts: 319
jonestown,pa
dmking
OP
enthusiast
|
OP
enthusiast
Joined: Apr 2011
Posts: 319
jonestown,pa
|
specs are old indy torquers from later 90s 270cc 335cfm 49.5cc cam is predator 263 265 @ 050 630ish lift solid. i have 1.6 ratio rockers. 13.5 compression 1050 dominator m1 intake timing all in at idle @34deg first pass was a 1.55 stumble cause i put a white cam in the back of carb ran a 10.27 @131.74 second pass i came out with about 3000rpm to get past the weaker pump shot and it left good considering how i left but only ran a 10.24@130 draging oil from half track till i stoped. ended splitting the block up through the mains on the drivers side halfway to the heads.
|
|
|
|
|
My pump gas 408 street/strip Dart weighs 3260# with me in it and goes 1.38-1.42 with 4.10 gears on drag radials. It's ran a best 6.57 in the 1/8.
