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August 20th, 2008, 02:21 PM
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Effects of a TOO HIGH STALL converter
I think I got myself a stall converter that is too high, but before I go there, can you experts tell me what the typical symptoms are, if that is the case
 On a positive note, I think all my leaks are gone, and my pressures are up, temps are always under 200* ..... will put my lockup switch back in when it cools down. Does anyone have the P/N for the normally open switch for 4th gear, so I don't have to get the whole "kit" ?     
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August 20th, 2008, 02:29 PM
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Car has to build a lot of rpm before it moves. At WOT it will sound like it never changes gears. With a data logger of some sort the rpm will only drop 200 rpm or less. Even 400 rpm drop is not enough.
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PTC Converter Distributor Twisted 6 Racing Fastest of the fastest Freeman, Fiscus, Kereny, Harmon, W. Brown Cruz, White, Ted A, Gomes...the list of record holders keeps growing  85 Regal w/ turbo SBC 4.96 @ 149.....3520# 94mm and 325's Best 1/4 pass 7.77 @ 181
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August 20th, 2008, 02:34 PM
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Are you referring to when the converter hits its stall speed or when it locks up?
Tell me if I am on right track? A lower stall rpm, will get it moving quicker from stop? A higher stall rpm, will produce more heat How would one decide what is the right level for ones motor?
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August 20th, 2008, 02:52 PM
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So could you estimate your stall speed by looking at log files and how much rpms drop with a shift?
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Gary Harris 72 GMC - 85 Silverado - 87 Grand National - 91 Galant VR4 2007 Ardmore Car Show
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August 20th, 2008, 03:10 PM
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Quote:
It's very difficult to define in forced induction cars. But a good rule of thumb is to get the car up against the converter and see what rpm is reached with "0" vacuum/boost (aprox. 100kpa). This value probably wont match what the converter manufacturer advertises, but it's a good place to start. If your footbrake can hold the boost, try it at 5#, then 10# and compare the numbers to advertised stall.
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TurboDave EWCS(SW) USN (Ret.) My Photo Gallery Email Us Sevierville, TN TranslatorPro MAFless fuel, spark and boost management 86 GN(TranslatorPro/ExtenderPro on speed density w/boost & fuel pump control,PLX-WB) (original owner) 87 GN (second owner) 84 L69 Z28 (original owner) 01 Excursion LTD 7.3L PSD(Power Stroke Diesel), Turbo, 4X2 08 Honda Accord EX-L, 270HP 3.5V6, AT
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August 20th, 2008, 03:59 PM
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Quote:
Quote:
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__________________
PTC Converter Distributor Twisted 6 Racing Fastest of the fastest Freeman, Fiscus, Kereny, Harmon, W. Brown Cruz, White, Ted A, Gomes...the list of record holders keeps growing 85 Regal w/ turbo SBC 4.96 @ 149.....3520# 94mm and 325's Best 1/4 pass 7.77 @ 181
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August 20th, 2008, 04:20 PM
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I had a 10" 3200 in my car and it resulted in my best 60 foot ever(1.58). BUT I was in third gear way before the 1/8 mile and the rpms climbed to 6000-6200 and only dropped 200-300 between 1-2 and only 200 rpms between the 2-3 shift. My RPM datalog looked like a straight line. Thats how you know you have a tight converter. Went with a 2800 and all is good. Havent went to the track yet though.......
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87GN GT6776bb, stock bottom end, stock heads/intake, 206/206 roller, 60# inj, PTE SLIC, Tranny by B. Hofer, PTC 10" 2800 Conv, Turbotweak, 93 octane & Alkycontrol  11.20@118 mph 1.71 sixty foot(leaving at 0 boost)
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August 20th, 2008, 04:37 PM
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Quote:
Sounds like your converter was LOOSE, not tight, Is that what you meant ?
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Tom Heatley Jr
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August 20th, 2008, 04:43 PM
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HAHA. Yes, Ed meant to say loose
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PTC Converter Distributor Twisted 6 Racing Fastest of the fastest Freeman, Fiscus, Kereny, Harmon, W. Brown Cruz, White, Ted A, Gomes...the list of record holders keeps growing 85 Regal w/ turbo SBC 4.96 @ 149.....3520# 94mm and 325's Best 1/4 pass 7.77 @ 181
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August 20th, 2008, 04:53 PM
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Hey, Im a public school graduate from south Louisiana. Your lucky I capitalize the first letters of my sentences.
My bad....yeah way LOOSE....
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87GN GT6776bb, stock bottom end, stock heads/intake, 206/206 roller, 60# inj, PTE SLIC, Tranny by B. Hofer, PTC 10" 2800 Conv, Turbotweak, 93 octane & Alkycontrol 11.20@118 mph 1.71 sixty foot(leaving at 0 boost)
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August 20th, 2008, 04:59 PM
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Ive gotta get off my butt and go use a few of these methods to see where my stall is. I spoke with Dusty earlier and he told me to do the RPM check at 0 boost and 5 boost like was mentioned in this thread. Ive learned more about these GNs in the past week on this board than I would have learned in years at the school of hard knocks.. Isnt this place great ???
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Tom Heatley Jr
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August 20th, 2008, 10:02 PM
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Converters that are made well will not slip alot when normaly driving.Alittle more than the stock one.However some companys will make converters that are very loose and have poor street manners.So dont confuse a poorly made converter with having to much stall.Usually the really cheap ones.I had a 3,800 stall in my car and it would spool super fast,drive like normal but inbetween full throttle shifts it would sit at 3,800 rpm untill it would match the rpm in whatever gear and then it would pull hard again.
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86 t type,6157 turbo,msd 50s,hotwired 340,3" dp ported elbow,comp 260 cam,rjc power plate,smc alky,speed pro forged pistons .30 over,mild homeported heads,pypes exhaust with testpipe,f body rad with ramchargers fan,3200 9.5 stall.Best 7.59 At 89 mph in the 1/8 on bfg drag radials.
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August 20th, 2008, 10:14 PM
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Yes that is correct. A quality converter like the PTC i have is very efficient in all aspects. Cruising (about 5% slip), top end (under 5%
), but when the converter is loaded the stall is increased dramatically. I see about 3100 with zero boost/vacuum. Flashes to 4700 at 24psi. The converter works so well its like magic. Its without a doubt the biggest improvement ive seen from a single part in years of playing with these cars.
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Blue GN: Old combo 559whp/706wtq. New buildup to come with race ported GN 1 heads and intake  . Black GN:Stock 147k shortblock except cam ,KB 70 mm TB and plenum, ported irons 1.77in 1.5ex, RJC head gaskets, ported stock intake, 212-212 comp roller, 1.65 T&D's, RJC powerplate, 1" plenum spacer, 83 lb/hr injectors, double pumper, FAST XFI, G-Body FMIC, welded ported stock manifolds, 3.5 dp, CPT 66BB GTQ, PAC dual nozzle alky injection, Dusty PTC 9.5", 200 4-R by me with billet shafted forward drum, billet input, billet ring gear and planet. 8.5 rear with Auburn, 28 spline Moser axles, and LPW girdle. 10.29@133.46mph .Time with old combo (stock ecm, p-trim turbo, and loose converter) 10.88@126mph. Stage II coming soon .
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August 20th, 2008, 11:54 PM
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John Wilde 86 T Type Blue - Driver 86 T Type Black - Resting 87 GN Back Halved - Sold
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August 21st, 2008, 12:31 AM
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good info
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August 21st, 2008, 02:35 AM
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Dusty - What about an AC 4000 stall with 1000 hp, 231 ci at 3000lbs? 5.33@130mph. Details will be PM'd. If there is anything to gain I'll open the checkbook
 scott wile
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TOYOTA TRUCK - V6 aka "yellow rice rocket" 231ci http://lc2toyota.tripod.com/ Recent video- http://videos.streetfire.net/video/4...930001c239.htm
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August 21st, 2008, 03:15 AM
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what is ideal for rpm drop. im looking at around 7-800rpm
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August 21st, 2008, 05:03 AM
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Tomard you haven't given us much to go off of but since you're a 350 with a 200-4R behind it the scenario is slightly different since you're probably not making the kind of torque we are while brake boosting the car. If you were to dyno the car and see where the torque band is you can get a better idea of what the converters stall should be so you can launch there on an N/A car.
Get that lock up switch back in as that's where the MPG and cooler fluid temps kick in when you're cruising around. Chevota, sounds like a bolt together PTC is in your future, I think someone on here said there's was around 2% up top, damn.
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Mike 87GN T-Top down 423lbs. Rebuild #2, BLK/BL Paint w/Custom Metal Flares, VPE Stg 3 Heads, 210/215 Roller Cam, TA49, V2 w/Blitz Blow Off, Billet Drum/Input, PI 3400 5disc, T Brake, Inland 3.5" DS, KB Plenum/70mm TB, Razor's Post Turbo Alky Kit, Devils Preturbo Alky Kit, TT Chip, 60lb Inj, Denso 280 Pump,-8/-6 SS Fuel Lines, MBC, Pwr Plt, PTE Oil Relocator, Preluber, Z06 Maf, Translator, Volt Master, Poston Headers, THSS 3.5" DP/Test Pipe, ATR SS 2.5" Y Pipe w/No Muffs, PST 2" Drop, Poly Bushings, Boxed Upper/Lower Arms, QA1 Shocks, Vacuum Converted, Aerospace 11" Brakes w/SS lines, Alum Drums, Polished Autodrags 15x8/15x10, 275/60 Nitto 555Rs
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