Didn't lock up I hope?
Gonna be able to change it?


:confused:

Had to run dad

I see your Father won first round

Lane Driver Car No. Class Dial In RT 60 FT 330 FT 660 FT 660 MPH 1000 FT ET MPH
Right Joseph Tankersley WIN 2537 SG 9.90 .008 1.648 4.714 6.755 123.29 8.455 9.890 155.22

I spend sometime redoing my simulation. What was the weather like? I had to pull a good amount of HP to somewhat match his run.

60 Foot ET = 1.6786
330 Foot ET = 4.7139
1/8 Mile ET = 6.7322
1/8 Mile MPH = 123.4014
1000 Foot ET = 8.4490
1/4 Mile ET = 9.8945
1/4 Mile MPH = 156.9030

Stan

The air was good I think I recorded a corrected alt of 1250ish ft this morning.

This is the time slip of me & dad running. Our cars are pretty close. Dad timer 1 .005 timer 2 3.070, me timer 1 .005 & timer 2 2.900.

Here’s the timeslip I gave you the info on.

Matt,
Thanks you very much for all of that information. I now see why I am having a problem, and having to pull so much HP. I wrote this code over 11 years ago while trying to help someone out, and it only uses a single timer.

Stan

No worries , your calculations have been impressive.

Matt, 1st off THANK YOU for making a swing with cam selection! Ya Gota make moves to move forward. That you did, that’s what moves the Pontiac community forward.
2cnd I have checked out you and your dads beautiful cars on numerous occasions,they are breath taking.
You guys are always in the motorhome so I really haven’t talked to y’all much

My 2cents on your original question, have you tried merge collectors?
I’ve always heard keep making the choke point smaller and smaller until it falls off then go back to the merge collector that made the most power.


I’m in that horsepower range but our motors are way different considering I run a 18 degree big chief head.
But for what it’s worth I have a 2 3/8 primary tube and a 5” merge collector that chokes down to 4”.

Feel free to knock on the door any time. I may have you mixed up but did I talk to yall at bowling green a couple years ago? I’ve been looking at collectors but trying to gather more data before buying. I believe I’m going to build another set with smaller tubes & merge collectors . I got a quote from Burns yesterday but they forgot to title the email sit down before viewing.

I bought some Schoenfeld merge collectors for my 2" Mad Dog 3 piece headers. 3 1/2" collectors so I was going to buy some 3" merge collectors (500$!!) Called their tech and they asked what HP of a engine I was putting them on and I told them 700ish. The recommended a 2 3/4 neck down collector.
I was concerned about it being too small and they assured me 2 3/4" was the number. They ran them on 900 HP Sprint car engines so I bought what they recommended.
Just got them all back from Caps Coatings, NICE !
Called their tech and they gave me the rundown on breaking them in. They want extra fans on the headers when you fire them up. And told me if there is a fingerprint on them it will get baked in. Clean them with alcohol first.
I am worried about installing them without scratching them all up. So they said to wrap them in blue painters tape first.
Its going to be one big pain but should be worth it.

Just sell a couple spare Carbs that you have, should cover it :)

I have no idea what spares you speak of.
After a long talk this morning I made my mind up that when we sell this property I’m punting this build & going another direction.

Matt,
Did you ever contact Larry?

Stan

I didn’t, someone ran my motor info on Pipemax & the guy from burns stainless did the same..

Did they use it to analyze your engine combination or just spec headers?

Stan

Just the headers.

Matt,
What did they come up with for headers?

Stan

Burns said 26” primary 8” of 2 1/8 to 9” 2 1/4 to 9” 2/38 use their collector (of course) with a megaphone. Bob Crawford built all our motors prior to us going full aluminum builds. He always said never go shorter than 28” on primaries or you’ll kill your torque. I talked to Frank @ AllPontiac yesterday & he said he uses 28” primary. My current headers are right @ 26”.

I know it’s been a few months but with a newborn I have only had time to get to the track once or twice since the last update. I wanted to try a few more things with my combination before totally abandoned it but nothing has helped. We ran the bowling green d3 race two weeks ago & I made a couple changes. I put my old converter in which was a tad looser but still not what it needed to be. Crossing about 7650-7700 & stalling @ 6200. I also moved my shift points again but no change, I moved my shift from 7k-8k in 200 rpm increments & it’s made no difference. I also made a couple of carb changes & have been able to make clean passes but the track performance just isn’t there. I mentioned before that we had someone look at my heads & say they needed too much work to fix due to having too much cross section @ 94%. This person was also going to build us two intakes as well as port the new set of dci5 heads dad has. After almost exactly a year I had to get the backs untouched. I’ve had several reputable Pontiac folks tell me I’ll never get what I want with these heads as long as I’m naturally aspirated.