Traction and trap speed?
#999882
05/25/11 10:05 PM
05/25/11 10:05 PM
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Joined: Jan 2003
Posts: 2,309
Tomorrow.
Damned67
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 2,309
Tomorrow.
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Hi All, Just been thinking about this years Mopar day at the track, formulating a plan of attack, and dreaming of improved ETs. My question for today is this: Can traction (or lack thereof) affect trap speed? My junk has been running a consistent 12.5x @ 114 on 8yo 205 (yes, 2-0-5)/70/14 Firestones. The trap speed would suggest the car is capable of mid-11s. I now have a set of 255/60/15 Mickey Thompson Sportsman S/T on there. I also have a pair of 275/60/15 M/T ET Streets waiting to go, but the rims I have for them may need the back space adjusted to fit. Either way, I'll be heading out there with a whole lot more traction. So, could I expect a (small) increase in trap speed? (That'll be the second question for today) Cheers! 
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Re: Traction and trap speed?
[Re: Damned67]
#999883
05/25/11 10:17 PM
05/25/11 10:17 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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If you make the chassis more efficient it will ET quicker... you might even see the MPH drop a small amount... like you said a 114 should put you at 11.50 
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Re: Traction and trap speed?
[Re: Damned67]
#999885
05/25/11 11:05 PM
05/25/11 11:05 PM
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Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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ET is ALL done in the 1/8 th mile. You want to concentrate all your efforts on getting the car to work in the 1/8 mile first. The second half of the track doesnt produce ET. Spend your time working on your short times, and the rest will follow. When you get a car working properly, you will be able to dial the car with only your 60' times. Chassis efficiency is what makes the car 60' well. Work on the 60's, 330 and 660 and you will see 1/4 mile improvements.If you want to learn a few things, watch and talk to the guys running stock eliminator cars. You will see what I mean.
What does your car 60' on AVERAGE now?
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: Traction and trap speed?
[Re: Damned67]
#999887
05/25/11 11:58 PM
05/25/11 11:58 PM
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Joined: Jul 2004
Posts: 19,318
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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114 put me at 11.80`s at l.a.c.r. w/crappy 60 fts. w/a 360 at 3200 lbs.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Traction and trap speed?
[Re: Damned67]
#999888
05/26/11 12:05 AM
05/26/11 12:05 AM
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Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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I'm sure your still allowed...lol
Is this a 4 speed car or auto?
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: Traction and trap speed?
[Re: CompWedgeEngines]
#999889
05/26/11 12:29 AM
05/26/11 12:29 AM
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Joined: Jan 2003
Posts: 2,309
Tomorrow.
Damned67
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 2,309
Tomorrow.
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Auto. To pre-empt further combo questions, here's a quick cut and paste from an old thread: "Here's the combo: A .030 over 440 block with Indy aluminium main caps and a Callies 4.25" crank, Oliver billet rods and Diamond pistons, giving a compression ratio of 10.4:1. On top is a pair of E'brock heads with some minor work, Indy rockers, and a 0.587/0.593 287/294 cam, under an M1 intake and 1050 Dominator. Downstream is a Mopar 175K converter and a 3.55 rear end"
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Re: Traction and trap speed?
[Re: MR_P_BODY]
#999891
05/26/11 12:58 AM
05/26/11 12:58 AM
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Joined: Jan 2003
Posts: 2,309
Tomorrow.
Damned67
OP
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OP
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Tomorrow.
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Quote:
What does that 175K conv stall/flash at
Not much. Doing the innaccurate test of foot on brake/increase RPM until wheels start turning, it's about 2400rpm. I've read on here in the past that they flash in the 2800-3000rpm range in other combos. If I had the money to spend, the first part of the combo to change would be the converter, but it's all I've got for now. (It was never supposed to take this long to get replaced under my original plan)
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Re: Traction and trap speed?
[Re: Damned67]
#999892
05/26/11 01:04 AM
05/26/11 01:04 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
What does that 175K conv stall/flash at
Not much. Doing the innaccurate test of foot on brake/increase RPM until wheels start turning, it's about 2400rpm. I've read on here in the past that they flash in the 2800-3000rpm range in other combos. If I had the money to spend, the first part of the combo to change would be the converter, but it's all I've got for now. (It was never supposed to take this long to get replaced under my original plan)
Yeah thats alot less than your peak torque.... also
you can figure that most "race" cars only make 25 mph
in the second half of the quarter
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Re: Traction and trap speed?
[Re: Damned67]
#999893
05/26/11 02:20 AM
05/26/11 02:20 AM
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Joined: Aug 2003
Posts: 43,251
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,251
Bend,OR USA
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Quote:
Quote:
What does that 175K conv stall/flash at
Not much. Doing the innaccurate test of foot on brake/increase RPM until wheels start turning, it's about 2400rpm. I've read on here in the past that they flash in the 2800-3000rpm range in other combos. If I had the money to spend, the first part of the combo to change would be the converter, but it's all I've got for now. (It was never supposed to take this long to get replaced under my original plan)
The bigger motors(torque and HP) affect the converters different than the stock C.I. motors due   If you can dead hook the car it may run a slower MPH than when it was spinning, as already said by someone else, been there done that Car spins the tire, 60 ft. slows down, 1/4 MPH goes up  I have a custom built 10 inch street and strip converter that would only foot stall 2300 RPM before sliding the front tires through the staging beams  I have a VDO Extreme playback tach, that same converter flashes to 4200 to 4400 RPM, depending on the track elevation and weather that day. My car weighs 3450 lbs with me in it, its best 60 ft.times has been 1.43 so ar on 315x60x15 M/T ET Street Radials with a 4.10 gear The motor is a 518 C.I. pump gas street motor, 10.29 to 1 compression with a six pak and CNC ported Eddy RPM heads, nothing special As already said also, work on the 60 ft. times and watch the MPH 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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