Bad 60 FT with 70 lb more of Megablock on my Cuda
#2520995
07/12/18 01:04 PM
07/12/18 01:04 PM
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Joined: Mar 2014
Posts: 195 Italy
Raffaplymouth60
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OP
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Italy
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Hi ... after my swap .. from 440 to 572 the car is very powerful .. but in the last race i see a worse of my 60 FT from 1.40 to 1.50 .. the new megablock weight is 70 lb more than the 440 block ... this weight on the nose can cause a bad 60 ft ?? i have caltracs setted with zero preload .. car weight is 3650 lb ...
Thanks
1970 Cuda 496 street driven 9.22@150 1971 Demon 572 7.82@176 1957 Desoto Adventurer Convertible 345 Hemi 1958 Plymouth Fury Christine 2008 Dodge Ram 1500 Hemi 1970 Dodge ChallengerRT 6pack 4 speed 1 of 135 1968 Dodge Charger RT 4 speed
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Re: Bad 60 FT with 70 lb more of Megablock on my Cuda
[Re: Raffaplymouth60]
#2521015
07/12/18 01:41 PM
07/12/18 01:41 PM
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Joined: May 2015
Posts: 1,134 Lost in Time
Iowan
super stock
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super stock
Joined: May 2015
Posts: 1,134
Lost in Time
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I'd say it's just not hooked up as well...
Have a great day Iowan
"obsolete is neat"
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Re: Bad 60 FT with 70 lb more of Megablock on my Cuda
[Re: Raffaplymouth60]
#2521018
07/12/18 01:46 PM
07/12/18 01:46 PM
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Joined: Aug 2003
Posts: 43,282 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,282
Bend,OR USA
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All those sort wheel based E body have terrible weight distribution, including my lightweight(2800 Lbs. with me in it) 1970 Grand Coupe Cuda tube chassis car. By adding more weight to the front end and more power you will need to find more traction to make the car as fast as it was before or faster. I would try adding 25 to 40 lbs. more weight as ballast at the rear bumper attached inside it so it has the most effect on the weight distribution.
Last edited by Cab_Burge; 07/12/18 01:47 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Bad 60 FT with 70 lb more of Megablock on my Cuda
[Re: Raffaplymouth60]
#2521083
07/12/18 03:59 PM
07/12/18 03:59 PM
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Joined: Jan 2003
Posts: 13,384 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,384
Marion, South Carolina [><]
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What shocks do you have? Tires? Air pressure? Transbrake or footbrake? Is this using the nitrous? If so, do you have a progressive?
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '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: Bad 60 FT with 70 lb more of Megablock on my Cuda
[Re: Raffaplymouth60]
#2521141
07/12/18 06:47 PM
07/12/18 06:47 PM
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Joined: Mar 2014
Posts: 195 Italy
Raffaplymouth60
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some info ..stock front suspension .. 90/10 shock , Rear monoleaf calvert , Rear shock qa1 double adj .. yes Nitrous with progressive controller 200 hp on launch and after 2 Sec 320 hp , caltracs at upper hole and ZERO preload
1970 Cuda 496 street driven 9.22@150 1971 Demon 572 7.82@176 1957 Desoto Adventurer Convertible 345 Hemi 1958 Plymouth Fury Christine 2008 Dodge Ram 1500 Hemi 1970 Dodge ChallengerRT 6pack 4 speed 1 of 135 1968 Dodge Charger RT 4 speed
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Re: Bad 60 FT with 70 lb more of Megablock on my Cuda
[Re: Raffaplymouth60]
#2521204
07/12/18 09:02 PM
07/12/18 09:02 PM
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Joined: Nov 2010
Posts: 1,397 Carson City, Nevada
Biginchmopar
pro stock
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pro stock
Joined: Nov 2010
Posts: 1,397
Carson City, Nevada
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Set the CalTracs in the bottom hole (First).
Set the shocks on a pretty tight compression (Meaning hard to compress(1-10 set them at 8) rebound about in the middle (Second).
With you in the car and the bars set neutral put one or two flats of preload in the CalTrac bars (Three).
Set the tire pressure around 10 PSI (Four).
Report Back (Five).
Last edited by Biginchmopar; 07/12/18 09:04 PM.
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Re: Bad 60 FT with 70 lb more of Megablock on my Cuda
[Re: Biginchmopar]
#2521585
07/13/18 07:54 PM
07/13/18 07:54 PM
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Joined: Mar 2014
Posts: 195 Italy
Raffaplymouth60
OP
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OP
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Joined: Mar 2014
Posts: 195
Italy
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Set the CalTracs in the bottom hole (First).
Set the shocks on a pretty tight compression (Meaning hard to compress(1-10 set them at 8) rebound about in the middle (Second).
With you in the car and the bars set neutral put one or two flats of preload in the CalTrac bars (Three).
Set the tire pressure around 10 PSI (Four).
Report Back (Five). Very good Infos ..Thanks for your Help .. therefore is better at 10 psi ? my tires is 29.5 /11.50/ 15 drag MT .. yes Calvert bar was adjusted at 1/4 preload with my ass ..
1970 Cuda 496 street driven 9.22@150 1971 Demon 572 7.82@176 1957 Desoto Adventurer Convertible 345 Hemi 1958 Plymouth Fury Christine 2008 Dodge Ram 1500 Hemi 1970 Dodge ChallengerRT 6pack 4 speed 1 of 135 1968 Dodge Charger RT 4 speed
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Re: Bad 60 FT with 70 lb more of Megablock on my Cuda
[Re: RustyM]
#2521588
07/13/18 08:02 PM
07/13/18 08:02 PM
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Joined: Mar 2014
Posts: 195 Italy
Raffaplymouth60
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OP
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Joined: Mar 2014
Posts: 195
Italy
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I would agree with 4 corner weighing the car. I have learned a lot from the guys here and one big thing i learned when on scales was- small adjustments to torsion bars moves weight around - A LOT.
You have added more weight on the front, this changes your torsion bar loading. You might find your corner weights all whacky now and some slight adjustments on torsion bars brings balance back to the car- for instance, you may be way heavy on drivers front, passenger rear- a little torsion bar tuning levels out rear cross weights for you, also helps the front weights as well of course. You will still be nose heavy but, better balance still helps. Perhaps there are areas from front seats forward that you can lose some weigh- look at scales again.
Its pretty amazing what just a quarter turn one way or the other on torsion bars does to the entire car.
8.5 lbs in tire seems really low but i don't see what tire it is- I go for the highest pressure that doesn't spin much- if your tire is paddling up to much ( wadding up) and the tire isn't staying pretty round, thats hurting your 60 ft.
Just went with a guy to film his launches and car was porpoising ( bouncing the front) on launch, 95% was too low a tire pressure, rest was shock too loose on extension - fixed that and went from 1.60 to 1.50 60"s. he is at 12 1/4 to 12.5 lbs now on a 13X 30 et- et street. Guys here got me to testing and- they were right- highest pressure we can run before losing 60 ft time is working> we are changing some springs and weight and if it hits the tire harder- we could end up at 12 3/4 to 13 lbs.
Lastly- we have found down here the big strokes don't like nearly as much timing as was generally thought. moved from 36 degrees with 110 race fuel ( 13.1 compression) to 32 degrees and 60 ft dropped to 1.46 and picked up 1 mph.
every mopar bb stroker we have dyno'd liked timing around 32- 33 instead of the 36-38 people were running with their 440 motors.
Hope this is of some help- envy you that motor-grin. with 572 i have 37 degree with naturally aspirated and best ET is 10.1@ 136 mph ... with 300 spray timing is -11 degree .. therefore is total timing 26 degree .. best ET is 9.3@151 mph 60 FT is 1.50 ... with 496 60 FT was 1.40-1.42 ...
1970 Cuda 496 street driven 9.22@150 1971 Demon 572 7.82@176 1957 Desoto Adventurer Convertible 345 Hemi 1958 Plymouth Fury Christine 2008 Dodge Ram 1500 Hemi 1970 Dodge ChallengerRT 6pack 4 speed 1 of 135 1968 Dodge Charger RT 4 speed
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Re: Bad 60 FT with 70 lb more of Megablock on my Cuda
[Re: Dduster]
#2521591
07/13/18 08:04 PM
07/13/18 08:04 PM
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Joined: Mar 2014
Posts: 195 Italy
Raffaplymouth60
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OP
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Joined: Mar 2014
Posts: 195
Italy
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Put Your car on scales and let's see what the weight distribution is now with the new motor. With weight/load numbers You can decide the 'how much?' and 'where?' questions if necessary. Also, is this a torsion bar frontend car or coilovers/Struts/...???? no possible weight 4 corner in italy... Sorry.. i know only total weight 3650 LB
1970 Cuda 496 street driven 9.22@150 1971 Demon 572 7.82@176 1957 Desoto Adventurer Convertible 345 Hemi 1958 Plymouth Fury Christine 2008 Dodge Ram 1500 Hemi 1970 Dodge ChallengerRT 6pack 4 speed 1 of 135 1968 Dodge Charger RT 4 speed
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Re: Bad 60 FT with 70 lb more of Megablock on my Cuda
[Re: RustyM]
#2521594
07/13/18 08:08 PM
07/13/18 08:08 PM
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Joined: Mar 2014
Posts: 195 Italy
Raffaplymouth60
OP
member
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OP
member
Joined: Mar 2014
Posts: 195
Italy
|
I would agree with 4 corner weighing the car. I have learned a lot from the guys here and one big thing i learned when on scales was- small adjustments to torsion bars moves weight around - A LOT.
You have added more weight on the front, this changes your torsion bar loading. You might find your corner weights all whacky now and some slight adjustments on torsion bars brings balance back to the car- for instance, you may be way heavy on drivers front, passenger rear- a little torsion bar tuning levels out rear cross weights for you, also helps the front weights as well of course. You will still be nose heavy but, better balance still helps. Perhaps there are areas from front seats forward that you can lose some weigh- look at scales again.
Its pretty amazing what just a quarter turn one way or the other on torsion bars does to the entire car.
8.5 lbs in tire seems really low but i don't see what tire it is- I go for the highest pressure that doesn't spin much- if your tire is paddling up to much ( wadding up) and the tire isn't staying pretty round, thats hurting your 60 ft.
Just went with a guy to film his launches and car was porpoising ( bouncing the front) on launch, 95% was too low a tire pressure, rest was shock too loose on extension - fixed that and went from 1.60 to 1.50 60"s. he is at 12 1/4 to 12.5 lbs now on a 13X 30 et- et street. Guys here got me to testing and- they were right- highest pressure we can run before losing 60 ft time is working> we are changing some springs and weight and if it hits the tire harder- we could end up at 12 3/4 to 13 lbs.
Lastly- we have found down here the big strokes don't like nearly as much timing as was generally thought. moved from 36 degrees with 110 race fuel ( 13.1 compression) to 32 degrees and 60 ft dropped to 1.46 and picked up 1 mph.
every mopar bb stroker we have dyno'd liked timing around 32- 33 instead of the 36-38 people were running with their 440 motors.
Hope this is of some help- envy you that motor-grin. you think need only adjust f4ont bars .. or need different torsion bars ??
1970 Cuda 496 street driven 9.22@150 1971 Demon 572 7.82@176 1957 Desoto Adventurer Convertible 345 Hemi 1958 Plymouth Fury Christine 2008 Dodge Ram 1500 Hemi 1970 Dodge ChallengerRT 6pack 4 speed 1 of 135 1968 Dodge Charger RT 4 speed
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