calculators/examples/ help
#2450775
02/12/18 06:04 PM
02/12/18 06:04 PM
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Joined: Feb 2017
Posts: 566 Texas
RustyM
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Anyone know of race calculators by weight/engine dyno/converter loss etc to help with building our cars- having realistic expectations and meeting them and/or helps with figuring out whats wrong when we don't meet expectations?
Secondly- can i get real world numbers from folks here running Dusters- weight/engine/hp/et ? Would like to get to 10.0 with engine we have but not sure thats realistic.
650 hp ( all done at 6 k ) 9 inch- 4800 stall /built 727 11.5X29.5 tire 8.75- 4.10 ( I can change gear, just had these here already) cal-tracs/mono leaf gerst tubular k/ifs should sit at 2900-3000 lbs with driver ( =/- a tad ) caged/frames connected /boxed etc.
We mostly run 1/8 mile here.
Thanks guys- just trying to do my due diligence .
Last edited by RustyM; 02/12/18 06:06 PM.
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Re: calculators/examples/ help
[Re: RustyM]
#2450804
02/12/18 06:55 PM
02/12/18 06:55 PM
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Joined: Dec 2005
Posts: 11,552 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,552
Fulton County, PA
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Moroso 89650 power speed calculator or "dream wheel" is a handy item. I have a few laying around here. Mark Williams also does a nice one. wallaceracing/calculators are good if you have the internet handy.
Converter loss is one of those things you sort of figure out once the car's together. Speed-tire size-gear ratios should calculate to a RPM number. If it's off, something is slipping. A few hundred RPM is normal for a torque converter. I've seen some cheapy, poorly speced or broken converters slip a lot more.
Last edited by CMcAllister; 02/12/18 06:56 PM.
If the results don't match the theory, change the theory.
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Re: calculators/examples/ help
[Re: RustyM]
#2450846
02/12/18 07:59 PM
02/12/18 07:59 PM
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Joined: Feb 2017
Posts: 566 Texas
RustyM
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thanks guys:
Iv'e been using Wallace quite a bit but, coming out faster than i think the car will be, however, it may be the weight thats just got my head twisted up. Im used to be B bodies- 330's, Roadrunners/GTX/Chargers etc.
Real world : decent air, decent track prep, good set up- does 650 at flywheel put a 2900-3000 lbs car at just under 10.0 on an 11.5 bias ply 29.5 tire ?
I 4 cornered the car, pretty well the same numbers Andy is looking at with his, weight distribution almost 50/50 each direction and thats with stock k frame in it and a power steering box still on it, steel bumpers on it- 1582 lbs. (Yes to about 80 lbs heavier on drivers front-power steering box/brace is most of that. with engine/trans/converter and driver Im at 2436 without third member, cage, frame connectors. With a tiny bit of fiberglass, a little trimming here and there- i think i can make 3000 race ready.
so- please feel free to scold me or school me- what I don't know, I don't know and thats what I want to change.
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Re: calculators/examples/ help
[Re: RustyM]
#2450864
02/12/18 08:45 PM
02/12/18 08:45 PM
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Joined: Dec 2005
Posts: 11,552 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,552
Fulton County, PA
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Moroso dream wheel says... I used 600RWHP since we're running it through a 727. 3000# = 9.75@138. 3200 if you weren't counting the driver goes to 9.90@135. I think with the chassis squared away, it should dip into the 9s.
If the results don't match the theory, change the theory.
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Re: calculators/examples/ help
[Re: RustyM]
#2450983
02/12/18 11:22 PM
02/12/18 11:22 PM
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Joined: Dec 2005
Posts: 11,552 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,552
Fulton County, PA
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Whole lot of cars out there that will sneak into the nines, but don't. 9.99 and quicker is a new ball game. License, chassis cert, new pants and jacket, gloves, full legal cage, net, etc., etc. Lot of guys don't want to go there just to run in the high 9s. 10.0s is good enough. Add some weight, short shift, throttle stop, de-tune it, whatever.
Last edited by CMcAllister; 02/12/18 11:24 PM.
If the results don't match the theory, change the theory.
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Re: calculators/examples/ help
[Re: RustyM]
#2451047
02/13/18 01:04 AM
02/13/18 01:04 AM
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Joined: Dec 2005
Posts: 11,552 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,552
Fulton County, PA
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Just write 10.00 on the window and race it. Do whatcha gotta do to slow it down.
If the results don't match the theory, change the theory.
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Re: calculators/examples/ help
[Re: RustyM]
#2451060
02/13/18 01:45 AM
02/13/18 01:45 AM
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Joined: Feb 2017
Posts: 566 Texas
RustyM
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OP
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Joined: Feb 2017
Posts: 566
Texas
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