??correct way to check stall ??
#364084
07/01/09 10:55 PM
07/01/09 10:55 PM
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Joined: Dec 2004
Posts: 1,489 St. Louis Mo.
10 o to go
OP
"Happy Don"
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OP
"Happy Don"
Joined: Dec 2004
Posts: 1,489
St. Louis Mo.
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Ok got my new 418 motor in have made 15 passes 2 different tracks .My buddy was watching from the stands and says it sounds like its just winding through the gear changes.He thinks im blowing through the convertor stall on the gear changes .I'm leaving at 4000 shifting 6600 traps 6800.Others say we should tighten my 8"turbo action if its stalling above 5400 or more.Anybody run 9" on 418s ? ets are 10.25s 128 mph 1.39 60ft ets are 6.40s 105 mph 1.39 60ft looking to get to 10.0s 9.90s motor should have it callie 4.00 stx22 590 w 1.6 625 lift ported eddies victor 340 2" spacer 12.7 commpression probe pistons 727 4.30 gear 3040 w/me 950 alky thanks don
2009 418" build dan smith built
new 9.96 131.82
6.23 108
1.30 60 foot
best to date 9/15/09
8in 727 430 dana 2860 lb 3040 lb w driver
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Re: ??correct way to check stall ??
[Re: wyoming]
#364086
07/01/09 11:52 PM
07/01/09 11:52 PM
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Joined: Sep 2005
Posts: 2,179 California, USA
blairboy3
top fuel
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top fuel
Joined: Sep 2005
Posts: 2,179
California, USA
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Not trying to argue, but that doesn't sound right. You're telling me that when I drop into drive from neutral, the rpm it level's out to is my stall? So my 3000 stall convertor is really +/- 950? Maybe I misunderstood you.
1968 Plymouth Fury III 4-Door: 12.79 @ 115, 60'- 1.93 (Hey... it's a Cruise ship... what do you expect?!) Famoso Raceway, 02/08
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Re: ??correct way to check stall ??
[Re: blairboy3]
#364087
07/02/09 12:10 AM
07/02/09 12:10 AM
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Joined: Jan 2004
Posts: 315 Russiaville, IN
mopar376d
enthusiast
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enthusiast
Joined: Jan 2004
Posts: 315
Russiaville, IN
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If you run a transbrake....
Take out the two step chip, hold the trans brake button and hit the pedal to the floor quickly.
Look at the tach for the stall.
Why does divorce cost so much?
Because it is worth it!!!!!
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Re: ??correct way to check stall ??
[Re: Quicktree]
#364093
07/02/09 08:01 AM
07/02/09 08:01 AM
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Joined: Oct 2006
Posts: 176 NC USA
ultimatelenny
member
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member
Joined: Oct 2006
Posts: 176
NC USA
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Quote:
another way to check stall is to roll along in 3rd gear about 10mph and mat it for a second. see what it does.
X2
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Re: ??correct way to check stall ??
[Re: ultimatelenny]
#364095
07/02/09 09:08 AM
07/02/09 09:08 AM
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Joined: Jun 2004
Posts: 1,217 Wellington, FL
cudabunch
pro stock
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pro stock
Joined: Jun 2004
Posts: 1,217
Wellington, FL
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Quote:
Quote:
another way to check stall is to roll along in 3rd gear about 10mph and mat it for a second. see what it does.
X2
X3 but if you want to know exactly, buy a LM1 or 2 and it shows when you leave and the drop between shifts.The other thing I would look at is a bigger rear gear or shorter tire as your 1/8 mile MPH is to low.If you read most of the people on here struggle to 109 in the 1/8 to get a 9.90.I know nothing about small blocks but could you use a Dominator on your engine? Good Luck
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Re: ??correct way to check stall ??
[Re: cudabunch]
#364096
07/02/09 09:27 AM
07/02/09 09:27 AM
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Joined: Nov 2003
Posts: 2,273 Greenville, South Carolina
BBLM23
top fuel
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top fuel
Joined: Nov 2003
Posts: 2,273
Greenville, South Carolina
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Autometer recording tach. Dump to laptop. Look at graph. See where convertor locked up on launch and where rpms fell back to after shift.
Walter 1969 Dart Swinger w/ARC Pump Gas 493 B1/BS 10.18 at 130mph Racing Pro in street trim. 1981 Aries ARC 548 B1 8.88 at 147mph (footbraking) 1996 Ram 2500 V10 16.52 at 80mph 1981 Reliant 400
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Re: ??correct way to check stall ??
[Re: Quicktree]
#364098
07/02/09 12:46 PM
07/02/09 12:46 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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Quote:
another way to check stall is to roll along in 3rd gear about 10mph and mat it for a second. see what it does.
that is how i check and it seems very accurate...roll along at idle in high gear and mat the pedal, see where it flashes to.
On your motor i would guess it would like right about 5000-5100 flash.....i think the car runs really well
Last edited by B3422W5; 07/02/09 12:46 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: ??correct way to check stall ??
[Re: 10 o to go]
#364100
07/02/09 01:03 PM
07/02/09 01:03 PM
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Joined: Dec 2006
Posts: 2,137 Byron, NY
W.I.N. Racing
top fuel
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top fuel
Joined: Dec 2006
Posts: 2,137
Byron, NY
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Taken from the ATI web site "Q: How do I determine my stall speed - is it different than flash? A: In order to check your torque converter’s stall speed, put your vehicle in high gear and drive the car at 1 to 2 miles per hour. Push the gas pedal to the floor and note your flash on the torque. This is the same as your stall speed. DO NOT DO STALL TESTS ON CARS EQUIPPED WITH TRANSBRAKES. When speaking with your ATI sales rep or distributor, be as succinct as possible regarding stall speed and your converter. To converter builders, stall speed and flash mean the same thing. If you ask for 4500 stall, this means if you flash your converter from idle, it should go to approximately 4500 rpm. For example, a 4500 torque converter in your car will probably only footbrake to 3000 rpm before moving your car depending on the quality of your brakes. Furnishing as much information as possible to your sales rep ensures that you get the correct product you are looking for.
Q: Should I do a stall test? A: No!! ATI strongly recommends that you do not conduct stall tests. Stall tests break parts, and not just converter and transmission parts. Remember, you are at Wide-Open Throttle (full power) and maximum load. The pistons, pins, rods, and crank will really take a beating.
Many racers ask why it is okay to leave the line at Wide-Open throttle, but not okay to do stall tests. The difference is this – when at the starting line at wide-open throttle, you release the brake and the RPMs accelerate from that point. In the converter, the stator is locked via the clutch assembly (sprag) and goes from maximum load in a controlled constant reduction in force to zero load (free wheel) as the car accelerates. The hydraulic forces in the converter are directed in a smooth and efficient manner for maximum torque multiplication and flow for adequate cooling. When performing a stall test at wide-open throttle (or even with a rev limiter such as the MSD Two-Step), you lift off the throttle and the RPMs, now at 5,000 or 6,000, get jerked down to idle. The stator and clutch assembly goes from maximum load and torque multiplication to zero load in an instant. The clutch is unloaded rapidly and the hydraulic forces are instantly disrupted into unknown flow paths due to the rapid reduction in torque.
We have seen many converters damaged by this rapid unloading when a ring and pinion, planetary gear set, or input shaft fail. The rampant hydraulic pressure actually breaks the pump blades (fins) completely off the converter pump.
It is for this reason that converter manufacturers have for years warned against “snagging the slicks” coming out of the water as RPMs can go from 5,000 or 6,000 to an idle as the tires catch. Once again, damage can be done to the sprag assembly. Also remember that the converter builds up a tremendous amount of heat in a short period of time. By not running an engine after a stall test, all that heated fluid lays in the converter without having a chance to go through the cooler. Excessive heat eventually “fatigues” the metals in the converter.
So, just say no to stall tests. They damage parts. Use the transbrake ON THE STARTING LINE ONLY – not in the pits, not in the driveway, not for your burnouts – AT THE STARTING LINE ONLY! Your cost per run will diminish significantly."
'01 P1500, Blown/Inj BAE,/Veney ,Bruno/CS2,Dana 60 '01 Dodge 3500 S Cummins Auto, Fresh air kit, 4" Exhaust, '05 Dodge Magnum R/T - Too Much to list '60 Willys CJ5 '01 International LPX - Project,DT466, Allison '64 Plymouth Valiant, Inj 528 Hemi, 2spd
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Re: ??correct way to check stall ??
[Re: W.I.N. Racing]
#364101
07/02/09 01:19 PM
07/02/09 01:19 PM
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Joined: Aug 2003
Posts: 43,748 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,748
Bend,OR USA
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I thank that there is a lot of confusion on stall speed versus flash stall versus rpm drop on gear change. I look at foot stall RPM, flash stall RPM in first gear and RPM drop on the gear change, both 1st and 2nd gears before making a decsision on changing or modifying that converter.If you do the math on that converters slippage at the finish line and it is less than 10% it is probally not blowing threw the converter. The first Art Carr "race" 8 inch converter we bought would foot stall over 4000 RPM, flash to 7000 rpm and then drop back to 6000 RPM, I shifted it at 7000 RPM and it would drop back to 6000 RPM. That converter was 3 to 4 MPH slower and .3 to .38 slower ET in the 1/4 than the stock 11 inch street Hemi converter that came in the car A real POS I had a TCI 8 inch like that also, Munsinger fixed thatr one after two tries
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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