Re: Actual track results - diff vs. spool
[Re: StealthWedge67]
#2568773
10/24/18 11:21 AM
10/24/18 11:21 AM
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Joined: Mar 2011
Posts: 3,171 Michigan
A727Tflite
OP
master
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OP
master
Joined: Mar 2011
Posts: 3,171
Michigan
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This is most likely a case of “the whole is more than the sum of the parts”. “High performance” is usually not a piece by piece equation. When we do testing we don’t make 9 changes and hope for an improvement. Oh well, onward and upward. That’s not what I was suggesting at all. It is more than plausible in my opinion however that you could measure each of these modifications in a vacuum by themselves and see no improvement with any single one of them. But when the right ones are hooked together; bam...... a full tenth. I see your point now, thanks for clarifying. And yes, I agree with you now.
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Re: Actual track results - diff vs. spool
[Re: justinp61]
#2568790
10/24/18 12:05 PM
10/24/18 12:05 PM
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Joined: Jan 2003
Posts: 11,786 Portage,michigan
B3422W5
I Live Here
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I Live Here
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Portage,michigan
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Don Which fans were you running? Electric fan= Derale..... nice unit......Moroso billet water pump Stock was stock production fan setup and waterpump
Last edited by B3422W5; 10/24/18 12:08 PM.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam, footbrake street/strip car Best so far, 10.32 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: Actual track results - diff vs. spool
[Re: B3422W5]
#2568823
10/24/18 12:44 PM
10/24/18 12:44 PM
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Joined: Oct 2003
Posts: 11,702 W. Kentucky
justinp61
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I Live Here
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W. Kentucky
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Don Which fans were you running? Electric fan= Derale..... nice unit......Moroso billet water pump Stock was stock production fan setup and waterpump Thanks. I have the MP viscous fan kit on my Dart and am curious if there was enough gain to justify the cost to change over. My deal is street/strip so if I changed it would have to work on the street too.
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Re: Actual track results - diff vs. spool
[Re: A727Tflite]
#2568831
10/24/18 12:57 PM
10/24/18 12:57 PM
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Joined: Jan 2003
Posts: 8,079 Tulsa OK
Bad340fish
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Posts: 8,079
Tulsa OK
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I changed too much at once to do a back to back on the stock water pump vs electric. But the quick cool down between rounds is priceless, I can be ready for another run in minutes. I have also had no problems on the street.
68 Barracuda Formula S 340
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Re: Actual track results - diff vs. spool
[Re: A727Tflite]
#2568859
10/24/18 01:32 PM
10/24/18 01:32 PM
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Joined: Nov 2015
Posts: 896 Missouri
jwb123
super stock
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super stock
Joined: Nov 2015
Posts: 896
Missouri
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Few companies make them any more, but I have had some decent results with the 4-2-1 type collectors, they pick up the low end torque. I built my current headers and used a set of Hedmans on it and they are about 1/2 tenth quicker. compared to a standard 4 into 1 style collector.
Last edited by jwb123; 10/24/18 01:33 PM.
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Re: Actual track results - diff vs. spool
[Re: justinp61]
#2568890
10/24/18 02:26 PM
10/24/18 02:26 PM
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Joined: Jan 2003
Posts: 11,786 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,786
Portage,michigan
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Don Which fans were you running? Electric fan= Derale..... nice unit......Moroso billet water pump Stock was stock production fan setup and waterpump Thanks. I have the MP viscous fan kit on my Dart and am curious if there was enough gain to justify the cost to change over. My deal is street/strip so if I changed it would have to work on the street too. I have done water pump and fan at the same time, never one or the other at same time.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam, footbrake street/strip car Best so far, 10.32 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: Actual track results - diff vs. spool
[Re: A727Tflite]
#2568916
10/24/18 03:00 PM
10/24/18 03:00 PM
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Joined: Apr 2003
Posts: 3,564 Tulsa, Oklahoma
340Cuda
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master
Joined: Apr 2003
Posts: 3,564
Tulsa, Oklahoma
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My notes below
1) Going from 11” drum brakes to drag race weight disc brakes My experience was going from ten inch drum brakes to four wheel disks, I saved forty pounds but did not pick up any ET or MPH that I could tell. However it sure stops a lot better and I would do it again. Dual calipers on the back are very much like having a transbrake.
2) Merge collectors vs. standard I have them on a 2 hp per CI small block but no AB tests. 3) Eliminating the water pump drive ( going to electric drive drive ) There is a good episode on "Engine Masters" where they tested this, big gain if I remember plus the ability to cool faster between runs and mentioned by Bad340Fish. Meziere would be my choice if for no other reason their great support.
5) 904 vs 727 with 2.45 low gear. ( heard .10 e.t. reduction ) The low gear may or may not help you but the 904 is worth at least a tenth.
8) Diamond piston versus old cast piston used in item 7. In my opinion anything you can do to raise the compression, use thinner rings and have lighter recpicating weight will help. Even at the same horsepower things that will help the engine accelerate faster will help on the track. (My opinion).
You did not mention it but in my experience, documented on the dyno, vacuum pumps make horsepower in engine with gas ported pistons, thin rings and low tension oil rings. Your mileage may vary.
Good luck and let us know your experiences.
Bill Lamb
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Re: Actual track results - diff vs. spool
[Re: A727Tflite]
#2568937
10/24/18 03:40 PM
10/24/18 03:40 PM
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Joined: Jan 2003
Posts: 13,492 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Marion, South Carolina [><]
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Getting rid of the stock clutch fan, but keeping the belt driven water pump dropped my ET a tenth on a high 11 sec combo.
Going to an electric water pump over a belt driven pump (electric fan already installed) dropped the ET another tenth on a mid 10 sec combo. These tests were all done w/ 440 engines in my cuda.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 4 speed, Dana 60 '71 Demon 340, no drivetrain, on blocks behind the barn '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Actual track results - diff vs. spool
[Re: justinp61]
#2568997
10/24/18 05:21 PM
10/24/18 05:21 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
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State of confusion
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Don Which fans were you running? Electric fan= Derale..... nice unit......Moroso billet water pump Stock was stock production fan setup and waterpump Thanks. I have the MP viscous fan kit on my Dart and am curious if there was enough gain to justify the cost to change over. My deal is street/strip so if I changed it would have to work on the street too. Do it, leave it off for quicker warm ups, cools stupid fast between rounds or after you park on the street and the et gains are real as others eluded to me included picked up a couple tenths going to elec. fan and pump.....
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: Actual track results - diff vs. spool
[Re: Thumperdart]
#2569073
10/24/18 07:48 PM
10/24/18 07:48 PM
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Joined: Aug 2003
Posts: 43,719 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,719
Bend,OR USA
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Last edited by Cab_Burge; 10/24/18 07:49 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Actual track results - diff vs. spool
[Re: A727Tflite]
#2569249
10/25/18 08:34 AM
10/25/18 08:34 AM
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Joined: Nov 2011
Posts: 291 PA
Harry's Taxi 2
enthusiast
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enthusiast
Joined: Nov 2011
Posts: 291
PA
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I remember an article by Cecil Yother (maker of leak down testers, torque plates etc.) saying a limited slip differential was quicker than a spool in his high 10 second 70 cuda.
I don't recall many other details from that article except that it was flat top piston, iron head 440, auto trans. I'm not even sure what tire size, but I think it was leaf spring equipped ....I wish I could find the article.
'86 Maple Grove KOS Mopar low qualifier......true street legal with no power adders.
NOS-used when losing since 1940.
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