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#1
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Improving 60's with loosening the Converter?
Could I gain much from increasing stall from 4,500 on "8 race converter and Turbo 400 with a brake to 5,500 or so?
Shift at 6,500 - 6,800 1/8 = 6.61 with a 1.41 at 106 Combination: 72 GTO - Race weight 3400 with me Elevation 980 Feet 465 and 12 1/2 to 1 455 bored .040 over Bore … Stroke… Hand Ported E-heads - '1999 - '2000 Heads Flowed 331 int. and 235 ext. 72 CC milled .060 Zero Decked Flat Top Ross Pistons Solid Roller at 276 / 279 at .050 and .635 lift Installed at 104 Comp Cams - Grind# P8 4028B / 4049B R 108.0 Intake Exhaust Valve Adjustment .020 .022 Gross Valve Lift .631 .630 Duration @ .020 Tappet Lift 312 316 Valve timing Open Close @ .050 INT: 30 BTDC 66 ABDC EXH: 67 BBDC 31 ATDC 108.0 Intake Center Line Intake Exhaust Duration @ .050 276 279 Lobe Lift .4210 .4200 Lobe Separation 108 MSD 6AL 2 MSD Billet Dist. Advance Locked at 34 degrees North Wind Holley 1050 Dominator "3 1/2 x 16 air filter "2 Hookers Headers Turbo 400 with a brake "8 4500 stall on the brake 4.11 gears with MT 10.5w x 28 slicks Last edited by CraigG.; 10-30-2024 at 10:15 PM. |
The Following User Says Thank You to CraigG. For This Useful Post: | ||
#2
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If it hooks I would say yes.
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#3
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It sounds like you might have a high enough power band for it rpm wise, but if your hp is nosing over by 6500 it's hard to be sure without having a dyno sheet to confirm what's going on.
What does that 4500 converter you have now flash to?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#4
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I don't know about the flash - if I footbrake it will flash to 4,500. It will set at 5,000 on the brake - I have only gone to 4,500 with the 2-step.
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#5
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What stall converters are stock and super stock class cars using?
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#6
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In my combo going from a 4,500 to a 5,000 of the same brand my car actually slowed up a bit .
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#7
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Yes if converter is built right. We run a 5600rpm stall in GTO and shift it at 6400
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#8
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slowbird - who do you use and what converter?
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#9
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U need to know a few things, where does it flash stall to now, where does it drop on the shifts, where’s it go thru the traps at?
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
#10
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What might be the cheapest way to get that data?
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#11
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I think you should pick up with more stall. Your combo is really close to the 463 I ran for several years. You have a little more cam and compression. It really liked the 10" PTC I have. It would stall to 5000 but lock up really well at 6500 through the traps. Typical 60' was 1.41-1.43 running low 10's @ 132-133. The way I measure stall is to go WOT at abut 25 mph in high gear.
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Greg Weigart IAIIA 520/pump gas/SD 325 E-heads/266-272 SR cam/1050 Dominator/3.73/ET Street Radial Pro/3300lbs/1.35 60'/6.21@110.47/9.77@137.08 Hot Rod Drag Week finishing averages: 2014 - 11.12 @ 118.56 2015 - 10.84 @ 124.97 2016 - 10.56 @ 127.88 2017 - 10.29 @ 130.74 2018 - 10.29 @ 130.53 2019 - 10.16 @ 132.34 2021 - 10.09 @ 132.69 2022 - 10.13 @ 133.07 |
#12
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Playback tach. 400ish $
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#13
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A playback tach is a pretty handy tool! This is the playback of my 25mph WOT test with the 10" PTC behind the new 520.
https://youtube.com/shorts/sXlpb65TE...kxzhEn5OTVjOMX
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Greg Weigart IAIIA 520/pump gas/SD 325 E-heads/266-272 SR cam/1050 Dominator/3.73/ET Street Radial Pro/3300lbs/1.35 60'/6.21@110.47/9.77@137.08 Hot Rod Drag Week finishing averages: 2014 - 11.12 @ 118.56 2015 - 10.84 @ 124.97 2016 - 10.56 @ 127.88 2017 - 10.29 @ 130.74 2018 - 10.29 @ 130.53 2019 - 10.16 @ 132.34 2021 - 10.09 @ 132.69 2022 - 10.13 @ 133.07 |
#14
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Another good tool to have is a GOPRO. I use one in my race car positioned to see the tach, gauges, fuel pressure gauge and the back of the drivers head, it makes evaluating a run really easy. I also have a dual FAST A/F gauge with playback, gets you all the data you need for the budget racer.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
The Following User Says Thank You to AG For This Useful Post: | ||
#15
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Fetch used GoPro and mount it inside on roll bar etc, I’ve done that for years and I can zoom in on the gauges etc
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
#16
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I used my android cell phone on the roll bar with a Big fail as picture, vibration and sound distortions.
GoPro recommendations - model, features, vibration and sound qualities? Thanks, Guys |
#17
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My converter stalls at about 5000 rpm but probably should stall at 5500. My typical 60' is 1.45 and i think it would improve with a higher stall. I shift at 6500 rpm and go across the line at 6700 rpm so you would probably improve your ET with a higher stal, which is very tricky to get right without spending a lot of $ through trial and error.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
#18
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AG what transmission, Brake or rear gear do you have?
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#19
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My car stalls about 5000 rpm and I 60' between 1.26 to 1.30 on a 9" tire.
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A new best of 9.135 @ 145.41 71 Lemans Sport. 72 Lemans Sport. |
#20
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I run a TH400 that I built with a full manual reverse pattern valve body, use a 3.90 rear gear, 28" tire and use a Redneck Racing 9.5" converter that has 6.5% slip across the line. I could use a slightly higher stall, 5400-5500, to get a better 60' time.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
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