Tire shake with P/G

Old 11-27-2011, 04:09 AM
  #11  
hammertime
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Originally Posted by TRChassis
Well we have tried just about everything, except transbraking it to 5,000. We usually use about 3-4000 rpm. We have tried changing the low end tune up, different tires and tire pressures. The tracks in this area are not the best, but they do prep them pretty good. I guess what I was getting at is that if there is a possibility the convertor is just locking up from the launch, in other words should I send it back and have it set up for a "softer launch" (if there is such a thing). We used to run lencos and could adjust the clutch a little for the shake but I am lost with this convertor/tire shake.

Rick
Rick, call Greg at FTI and tell him I sent you there for some info. Most think you need a 10" converter with a blower to kill some of the hit, which is just the opposite most 10" stuff is more aggressive then a 9".

2 months ago a customer at the shop I wire for had massive shake issues with his blown dragster. We went to the track with him and a few different converters, tire shake massive with the 10", put the 9" in it and picked up 2 tenths and no tire shake. Went [email protected]
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Old 11-27-2011, 04:33 AM
  #12  
TRChassis
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Default Re: ?

Originally Posted by bbchevy
Originally Posted by bbchevy
Rick,
I ALWAYS had My BLOWN/Alcohol converter set-up as TIGHT as they could make them!Thats what the Blower is For,........!Sounds to me Like your Tire Pressure is OFF?Or maybe take some B/V away and get After it a little HARDER!!
Hope that Helps,its NOT Much,but sometimes thats alls YOU Need?
Later
G 8)
TIGHT CONVERTER!!!!
Later
G 8)
BB Chevy,
Do you mean we need a tight converter or our problem is a tight convertor?

Thanks,
Rick
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Old 11-27-2011, 04:37 AM
  #13  
TRChassis
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Originally Posted by hammertime
Originally Posted by TRChassis
Well we have tried just about everything, except transbraking it to 5,000. We usually use about 3-4000 rpm. We have tried changing the low end tune up, different tires and tire pressures. The tracks in this area are not the best, but they do prep them pretty good. I guess what I was getting at is that if there is a possibility the convertor is just locking up from the launch, in other words should I send it back and have it set up for a "softer launch" (if there is such a thing). We used to run lencos and could adjust the clutch a little for the shake but I am lost with this convertor/tire shake.

Rick
Rick, call Greg at FTI and tell him I sent you there for some info. Most think you need a 10" converter with a blower to kill some of the hit, which is just the opposite most 10" stuff is more aggressive then a 9".

2 months ago a customer at the shop I wire for had massive shake issues with his blown dragster. We went to the track with him and a few different converters, tire shake massive with the 10", put the 9" in it and picked up 2 tenths and no tire shake. Went [email protected]
Thanks David, I will call Greg when I get a chance and pick his brain. We are going to try our 8" converter that was just re-done even though it is built for an injected SBC in this set up. It may just give us the info we need, then I can get someone like Greg to build us a converter that will help us.

Thanks again,
Rick
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Old 11-27-2011, 02:57 PM
  #14  
bbchevy
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Default Re: ?

Originally Posted by TRChassis
Originally Posted by bbchevy
Originally Posted by bbchevy
Rick,
I ALWAYS had My BLOWN/Alcohol converter set-up as TIGHT as they could make them!Thats what the Blower is For,........!Sounds to me Like your Tire Pressure is OFF?Or maybe take some B/V away and get After it a little HARDER!!
Hope that Helps,its NOT Much,but sometimes thats alls YOU Need?
Later
G 8)
TIGHT CONVERTER!!!!
Later
G 8)
BB Chevy,
Do you mean we need a tight converter or our problem is a tight convertor?

Thanks,
Rick
Rick Yes you NEED a TIGHT Converter,3000-3500 Range!
Later
G 8)
GOOD Luck with that 8",.........
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Old 11-27-2011, 03:37 PM
  #15  
hammertime
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Originally Posted by TRChassis
Originally Posted by hammertime
Originally Posted by TRChassis
Well we have tried just about everything, except transbraking it to 5,000. We usually use about 3-4000 rpm. We have tried changing the low end tune up, different tires and tire pressures. The tracks in this area are not the best, but they do prep them pretty good. I guess what I was getting at is that if there is a possibility the convertor is just locking up from the launch, in other words should I send it back and have it set up for a "softer launch" (if there is such a thing). We used to run lencos and could adjust the clutch a little for the shake but I am lost with this convertor/tire shake.

Rick
Rick, call Greg at FTI and tell him I sent you there for some info. Most think you need a 10" converter with a blower to kill some of the hit, which is just the opposite most 10" stuff is more aggressive then a 9".

2 months ago a customer at the shop I wire for had massive shake issues with his blown dragster. We went to the track with him and a few different converters, tire shake massive with the 10", put the 9" in it and picked up 2 tenths and no tire shake. Went [email protected]
Thanks David, I will call Greg when I get a chance and pick his brain. We are going to try our 8" converter that was just re-done even though it is built for an injected SBC in this set up. It may just give us the info we need, then I can get someone like Greg to build us a converter that will help us.

Thanks again,
Rick
You'll find Greg knowns his stuff, do you know if you JW 10" has 8" internals like most other 10" converters do ? The blower car we worked on, was 6600 on the fallback stall, the right guy in a lighter car can get the loose converters to work well, which makes them deadly.
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Old 11-27-2011, 08:59 PM
  #16  
zipper06
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I run a 4000 stall 10" with my blown sm/blk, but it's probably apples and oranges because it's a door car. What most people donot understand is that a good blower is all in at 3000 rpm, you're not going to get more boost after that just more air flow.

Zip.
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Old 11-28-2011, 04:09 AM
  #17  
TRChassis
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Default Re: ?

Originally Posted by bbchevy
Originally Posted by TRChassis
Originally Posted by bbchevy
Originally Posted by bbchevy
Rick,
I ALWAYS had My BLOWN/Alcohol converter set-up as TIGHT as they could make them!Thats what the Blower is For,........!Sounds to me Like your Tire Pressure is OFF?Or maybe take some B/V away and get After it a little HARDER!!
Hope that Helps,its NOT Much,but sometimes thats alls YOU Need?
Later
G 8)
TIGHT CONVERTER!!!!
Later
G 8)
BB Chevy,
Do you mean we need a tight converter or our problem is a tight convertor?

Thanks,
Rick
Rick Yes you NEED a TIGHT Converter,3000-3500 Range!
Later
G 8)
GOOD Luck with that 8",.........
Thanks for the help BB Chevy.

Rick
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Old 11-28-2011, 04:10 AM
  #18  
TRChassis
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Originally Posted by hammertime
Originally Posted by TRChassis
Originally Posted by hammertime
Originally Posted by TRChassis
Well we have tried just about everything, except transbraking it to 5,000. We usually use about 3-4000 rpm. We have tried changing the low end tune up, different tires and tire pressures. The tracks in this area are not the best, but they do prep them pretty good. I guess what I was getting at is that if there is a possibility the convertor is just locking up from the launch, in other words should I send it back and have it set up for a "softer launch" (if there is such a thing). We used to run lencos and could adjust the clutch a little for the shake but I am lost with this convertor/tire shake.

Rick
Rick, call Greg at FTI and tell him I sent you there for some info. Most think you need a 10" converter with a blower to kill some of the hit, which is just the opposite most 10" stuff is more aggressive then a 9".

2 months ago a customer at the shop I wire for had massive shake issues with his blown dragster. We went to the track with him and a few different converters, tire shake massive with the 10", put the 9" in it and picked up 2 tenths and no tire shake. Went [email protected]
Thanks David, I will call Greg when I get a chance and pick his brain. We are going to try our 8" converter that was just re-done even though it is built for an injected SBC in this set up. It may just give us the info we need, then I can get someone like Greg to build us a converter that will help us.

Thanks again,
Rick
You'll find Greg knowns his stuff, do you know if you JW 10" has 8" internals like most other 10" converters do ? The blower car we worked on, was 6600 on the fallback stall, the right guy in a lighter car can get the loose converters to work well, which makes them deadly.
Thanks David for the help.
Rick
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Old 11-28-2011, 05:42 AM
  #19  
hammertime
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Originally Posted by zipper06
I run a 4000 stall 10" with my blown sm/blk, but it's probably apples and oranges because it's a door car. What most people donot understand is that a good blower is all in at 3000 rpm, you're not going to get more boost after that just more air flow.

Zip.
Zip you nailed it with the apples and oranges on the door car, with the lighter cars you can get away with the loosened converter.
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Old 01-07-2012, 12:23 PM
  #20  
roadkill2
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"Apples and Oranges" . . Definitely!

Tire Shake, basically, is caused by not enough tire speed to keep the sidewall wrinkled and the sectional profile in a rectangle . . The cure is as varied as the vehicles susceptible to it . .

A FED really shouldn't be exhibiting a lot of it because of the inherent design and weight bias . . But it does happen . . Perhaps not enough negative pitch on the crank centerline . . More common on rear motored cars, blown altereds and blown door cars built to run in the 7 second and faster range . .

I'll go with the Tighter Converter suggestion. Awhile back I was the crew chief for a Blown Alky Altered and we stalled at 5000+ on the starting line . . 500" B Chrysler, 8-71, Hoosiers, 7 second car . . never had a tire shake problem.

On the Blower deal . . "3000 RPM and you're done" . . not really. Depends on your Blower and the pulleys you use . . If that were the concrete case, you wouldn't need to overdrive a Blower like we all do on a competition Engine . . and I underdrive the little 144 on my Street Rod so that in high gear I'm not running against compression, yet when I stand on it it starts working at 2650 engine RPM . . Noticeably!
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