Test and tune tomorrow

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340 Dart

340 Dart

I don't know ****.
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Well I got the Comp shocks put on the car today and changed out the 600 Holly to the 750 Edelbrock. I took it for a test run and it pulled hard to 6,000 and I shifted. The little holly would just pull to 5,600-5,700 and was starving the last second or two of the run.

What is a "safe" shift point for me if it is still pulling hard? 6,000? 6,200?

The 600 Holly ran like this:
1.84 60' and a 13.1 at 103mph

How do you think the 750 will do?

Here is the total build:
75 Dart weighed 3480 with me in it.
360 .030 over​

holly 600 DP (changing to the 750 Eddie)​
weiand x-cellerator intake​
cromoly pushrods​
cam is sum 20-232-4 .480/.480 lift 280/280 duration with matched lifters & springs​
9 1/2" X 26" MT's​
2600 stall​
suregrip with 4.10's​
cheetah manual valve body​
shift kit​
8 1/4 rear​
904 tranny​
ss springs​
3 way adjustable shocks​
MP distributor with msd2 coil​
J heads with stock valves but mildly ported​
Dynomax headers with X pipe, 2 1/2" exhaust, magnaflow "wideopen" mufflers​

 
Thanks Benton.

12.8 is where I guessed it too, but I was hoping for a 12.6 out of her.

I've got a buddy with a "F" body camaro running 12.6 and he has this HUGE lumpy cam and can barely drive it on the street. Mine idles quiet and very smooth.
 
I would suggest you get a base line, then experiment with shift points. Higher in the case of your cam and gearing mnay not lead to faster ETs. I would think the engien will make more power all accross the board. But, you will want to stay below the hp peak, and I'd put that around 5800 with that setup. So I would shift at 6 on one run, then try shifting at 5800. Then try 5600. You may find the rpm is not where the best usable power is. I'd look for around a 12.80 too.
 
Here you go! Sorry just got up (night worker).



Well I got the 75 Dart in the 12's last night (barely). Not as deep as I wanted or expected, but I will take it.

60'.....1.81
1/8.....8.22
1/4.....12.972
mph....102.86

This was the 8th run of the night the 9th and final was this:

60'.....1.85
1/8....8.26
1/4....12.997
mph...103.14

The other 7 runs were all 1.8 60's and 13.0somethings.
It ran the best with 24 initial 38 total, shifting at 5,800 and the aircleaner on.

It had very little or no tirespin launching at 2,500. Hooked real well with the new shocks.

I am almost done working on the car now. This weekend it gets subframe connectors and a driveshaft loop. After that I can start concentrating on paint.

Kind of surprised the 750 didn't do better but the plugs were nice and tan.
Maybe that is just all she has.

Moper was right on with the shift points!
 
There ya' go! At least you can say she can run high 12's. Actually for the cam, carb, and intake you're running, those are some really respectable time. Congratulations. :)
 
[It had very little or no tirespin launching at 2,500. Hooked real well with the new shocks.

Did you try launching just above idle - like 1200rpm? sometimes loading the convertor up is not the best launch for 60' time etc.
Take you 600cfm with you next time and swap out to compare- you may be suprised.
 
Thanks oldvart.

I actually did try launching off idle, at 1,000 and at 2,000. After my power brake to manual conversion it will actually hold 2,500 at the line for the first time and it got 2 or 3 1.81 60's this way.

I actually am going to take the 600 out next time and throw a spacer under it to see if there is any difference. I will try it the same night with the 750 and the spacer also.
 
388dart said:
Did you try launching just above idle - like 1200rpm? sometimes loading the convertor up is not the best launch for 60' time etc.
Take you 600cfm with you next time and swap out to compare- you may be suprised.
Click to expand...


I was just going to say that...lol. Nice job. I'm sure it has more tuning ET drop in it. Edelbrocks rarely are "just right" out of the box. You can quickent he secondary opening on the AFB design by removing some of the counterweight on the secondary air door. If you have gear and convertor, you may find it runs faster wiht it opening faster. It's a heavy package too, so you may also try adding a little initial timing and bolting the 600 back on. If you can gain .1 in the 60', you should lose about .3 on the full 1/4 mile. The 60' is key. And I think launching from just off idle will be better for you.
 
Ran it again last night but with the spacer and the 750. Best of 4 runs was:

13.04 at 103.4 and a 1.88 60'

Swapped over to the 600 with the spacer and ran 5 runs. Best was:

12.96 at 104.2 and a 1.84 60'

I did have to put some 83 jets in the back but it looks like the 600 Holly DP actually outperformed the Eddie 750 on my build.
 
"You can quickent he secondary opening on the AFB design by removing some of the counterweight on the secondary air door. If you have gear and convertor, you may find it runs faster wiht it opening faster"

That is the key. I think if you can tune the secondaries and get the fuel curve right, the 750 will run faster. Look to the changes in the 600 to get the numbers it did. Holley's are easier to mess with by a long shot tho. Nice work in any case.
 
Updated with similar combo

360 727 3.7

[email protected] 1.91 60'

Ony change from the 12.84 to 12.7 was changing the holley 750 to 80 jets allround

Cheers

Benton

Copy of normal_20070217_IMG_0113.jpeg
 
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