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

If it hooks I would say yes.

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?

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.

What stall converters are stock and super stock class cars using?

In my combo going from a 4,500 to a 5,000 of the same brand my car actually slowed up a bit .

Yes if converter is built right. We run a 5600rpm stall in GTO and shift it at 6400

slowbird - who do you use and what converter?

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?

What might be the cheapest way to get that data?

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.

Playback tach. 400ish $

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

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.

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

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

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.

AG what transmission, Brake or rear gear do you have?

My car stalls about 5000 rpm and I 60' between 1.26 to 1.30 on a 9" tire.

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.