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Loss of driveline speed
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DRR Trophy
posted
After sudden loss of et I compared before and after runs and saw a 550 rpm drop in drivshaft speed while on the stop.thinking torque convertor or tranny slipping.Engine rpm and top end mph stayed the same,any thoughts?


Doing my part to raise the average IQ on this board
 
Posts: 51 | Location: badlands of New Mexico | Registered: January 20, 2011Reply With QuoteReport This Post
DRR Trophy
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I am thinking that if you had a converter issue or transmission slip it would show up primarily under full load.
 
Posts: 36 | Location: Bradenton | Registered: August 21, 2010Reply With QuoteReport This Post
DRR Trophy
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I had the same thought,but gap between driveline speeds begans to close at full throttle.Can't figure this one out.


Doing my part to raise the average IQ on this board
 
Posts: 51 | Location: badlands of New Mexico | Registered: January 20, 2011Reply With QuoteReport This Post
DRR Pro
Picture of rusty
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post before and after graphs


honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224

 
Posts: 1390 | Location: texas | Registered: February 17, 2006Reply With QuoteReport This Post
DRR Top Comp
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Rusty,

I don’t think he has run the car since then. Great Bend will probably be his next race but I know he’s wanting to figure this out first.


Clowns to the left of me, Jokers to the right. Here I am.......
 
Posts: 5298 | Location: stuck in the middle with you! | Registered: March 11, 2002Reply With QuoteReport This Post
DRR Sportsman
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Possible ground to stop or electrical connection? Just a thought.


Jeff McClure
 
Posts: 240 | Location: Texas | Registered: December 02, 2006Reply With QuoteReport This Post
DRR Trophy
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Going to Great Bend with rebuilt tranny and converter.When in dought throw $$$ at it!


Doing my part to raise the average IQ on this board
 
Posts: 51 | Location: badlands of New Mexico | Registered: January 20, 2011Reply With QuoteReport This Post



DRR S/Pro
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Possibly the lack of altitude may help fix the problem (Salt Lake down to Great Bend). Good luck, you will find the solution to your problem. This may have simply been an air bleed size problem.

See you in Vegas in November.

Bob
 
Posts: 3074 | Location: Lakeside, Ca | Registered: February 15, 2003Reply With QuoteReport This Post
DRR Sportsman
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If engine RPM is the same and DS is 550 low, I would next look at G-meter reading.

And when you say 550 low is that at the end of your 2.x seconds on the stop?

Assuming you are shifting on time .5 out it's hard to imagine how trans / converter would be cause that.
 
Posts: 671 | Location: New Jersey | Registered: April 26, 2001Reply With QuoteReport This Post
DRR Trophy
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Bob I raced in Denver before going to Salt Lake,no problems there.Also 5 passes at SL before problem accured.
Greg as you said shifting at .5 from time stop closes to end of run driveline is slow,gap narrows slightly after stop comes off.I dont have gforce sensor.et off a tenth.Only explanation can be drivetrain slipping I checked for brake drag nothing there.


Doing my part to raise the average IQ on this board
 
Posts: 51 | Location: badlands of New Mexico | Registered: January 20, 2011Reply With QuoteReport This Post
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