Is your throttle stop/delay one that has you at an idle/set rpm then opens when ready to go, or on the mat and the 2 step keeps it at a set rpm until ready to go?


Nice dyno sheets!


:)

My stop rpm is 3750 & remain in low gear while on the stop.

What does your fathers car weight and what et does he dial?

Just a WAG using 3350# race weight.

1000 Foot ET = 8.4412
1/4 Mile ET = 9.9051
1/4 Mile MPH = 155.9576

Stan

His car weighs 2750, mine is 2800 & change , I plan to weigh it next week @ the 4 wide . I am guessing I’ll be around 2825. We both run super gas 9.90. He’s usually 9.90 @ 158-160, with his single carb his best mph is 162.At the gators he was having issues & his mph had dropped to 155-156. I was running 157 there. & never making a clean pass. We have matching 1250 get’m carbs on both. Both cars have 3 speed lenco/bruno combinations. 2.08 1st for him, 2.24 for me & both have lightened 4.57 gears. Mine was built to be a twin to his but that never works out. Both have Bickel chassis as well.

My simulations below 1000 foot with a throttle stop are way out. About 10 years ago here on PY I did do some simulations for someone who was running a .90 class. The idea for to see what MPH increase they would get from more HP but still running the same et. The simulations were fairly close.

Thank you for that information.

1000 Foot ET = 8.4739
1/4 Mile ET = 9.9008
1/4 Mile MPH = 160.2311

How close is my 1000 foot et?

Stan

Pretty close actually. Here’s a time slip from bowling green last year. I’m 2464 & killed 4 mph.

Dad is 2537 that was this morning at Reynolds Ga

Good luck down in Reynolds! You guys have them Pontiacs flying! Say hi to Dave P and Kevin M for me.

Dad & my sister made the trip. Our daughter had RSV & parainfluenza last week. It’s been a rough week or so here.

Thanks. What is the weather? I pulled some HP and shorted the time of the stop.

1000 Foot ET = 8.4353
1/4 Mile ET = 9.8825
1/4 Mile MPH = 157.8409

Stan

Can you adjust the the time when the throttle 1st close? (like 1 second into launch)
Delay closed is around 2 seconds?

Also actual carb being throttled or a butterfly in spacer under carb?

Hope your daughter is better.

Sorry your Daughter is not feeling well :(

I lined up with Laurel on a Time run today.

Sounds like the headers are too big. Try adding the extension to see what happens. Maybe after Charlotte, ask dad if you can try his intake. lol

I wish I could try his intake & headers..

Your mph is down , your wedge motor not wedging?

Yes, I have timer one set to come on @ 0.005, this is a carb with under the carb stop but I also have a APD maxspeed with the stop made in the carb.

I don’t always claim Laurel & most dont know me on here yet so don’t give them clues lol.

Hope your daughter is feeling better.

Maybe someone else will look at this and see it as one thing. I don't know what it is, but think it has to be a combination of parts.

Stan

I agree Stan, I think it's a combination of parts that's causing his issue, not 1 part.

Both times I’ve had it on the dyno the guy said your problem is that 55 gallon intake you have. It barely made 1000 hp the first time. We changed cam & took some plenum area out & made 1071.9. I’ll message the guy again for the intake scan information. Not the best pics but here is a before and after of the inside of my plenum.

Here is the pic not cropped of how it was when I got it. We thought the plenum area was huge right off the bat. Sent pics to Don & he disagreed thinking it may not be big enough.