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If it bogged you might need more pump shot???

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pump shot as in squirter, or as in pump cam?

its got 35 squirters in it right now, primary and secondary. 3.5PV and 75 primary jet, 76 secondary jet. Used to have a 78 secondary in it, but it was running quite a bit richer with that in it. Once I get some solid AFR numbers I think I will have a better direction for jetting

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Try a 4.5 PV, 74P and 80S. Then try a Blue pump cam and .031 squirters. Make sure you adjust the pump arms. Blue cam in the front and rear!
Make sure your mixture screws are about 1 1/2 to 2 turns out even if it idles a bit rich. That helps your throttle transition out also.
Looks good!!

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Thanks for the advice Brian...is this a jetting combination that you have done on similar builds to mine? That jetting is actually close to what I was going to try again when rejetting (stock was 75p, 80s). Right now my idle screws are about 1/2 to 1 turn out respectively since that was where the best idle and highest vacuum was..should I still try and back them out more even if it compromises idle quality? Or will the different jetting, pump cam, and pv allow it to idle ok with 1.5-2 turns out?

I don't know much about pump cams, but what exactly do they do, and when tuning with them, what do they change exactly? Thanks again as usual..like i said before, I am very happy with the way this engine works, and I think I can hit a low 12 with further tuning, which I will be extatic about considering how little I have into this motor

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The pump cam is responsible for the volume/time the squirter sees. Trust me, get 2 blue cams, and go back to .031 squirts. Go up to 4.5 PV, and set the mix screws at 1 1/2 for now.
Yes it will be a tad rich, that's the cam and that's OK.
Very nice looking car and very good for a 9:1 360 4 row!!

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First off...good first outing. My opinion is that you need to increase your launch rpm (I ran into the same issue early on with my 4spd Demon). Like Mr P stated the small block doesn't make a lot of torque, so it needs rpm. You've stated that you have a 2-step in the car so I would keep increasing launch rpm (at the time I was tuning I would go up in increments of 400), then back off when your '60s start going the wrong way. The reason I say this is that (I'm assuming your leaving with the pedal on the floor) you've used your pump shots. The video camera is a great tuning aid for this. I found that what I thought was a clean leave still had a slight bog when reviewing the video.
Keep testing...you'll get it.

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Question for ya- when you used a two step, or if you powershifted, did you get fire coming out of the exhaust?

Not that I was aware of...never saw it on the video's. Maybe you're hitting the rev limiter when you shift??? I did hit the high side limiter when it was only set 200rpm above my shift points (I run an MSD Digital6). I've increased it to 400rpm above shift points and don't hear any misfires when I power shift.

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Nice car and great first outing ! Tune tune tune and then some. You will get tons of advise for tuning but the best I can tell you is make one change at a time and write down what changes you made. Believe me its easy sometimes to forget what made it faster or slower and its easy to forget jet sizes as I know that well. Thats why I like to even write down what size jets I put in.



As for launching I agree with some here. I used to bracket race a 340 Dart back in the 80's that ran a best of 11.92 and I had it very consistent for a stick car. I always left the same way every run. That was as soon as I saw even the flicker of the first yellow lite I would zing it up to about 5 or 6K. Then when the last yellow was coming on (or when I wanted to launch) I would floorboard it and pop the clutch. And I mean I would slam it to the floor and hold it there thru the 1/4 mile. As long as you have enough gear it will take it and if it hooks good you will have a great launch. My feeling was I was there to race it and race it hard so I ran it as hard as I could and if it breaks then so be it as I would fix what broke and beef it up. To me thats the only was to launch a stick car.........slam the throttle on the floor and let it rip. Good luck with that cool looking and running Mopar and I bet you hit the 11's soon enough. Ron

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Question for ya- when you used a two step, or if you powershifted, did you get fire coming out of the exhaust? I am getting that and im not sure if thats normal or if its something i should be worried about

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How do you have your 2 step button/switch hooked up...
if you have it on the clutch you could be engaging
the 2 step when you hit the clutch

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no I have it on the shifter with a button...i've been told by some that the fire is normal because its popping unburnt fuel? but i thought I would ask here, since its quite the lightshow under the car when im using it lol

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i always like watching a old school stick car beat up on modern muscle!!

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yea, tell me about it, felt good! I raced a Z06 vette, which I knew would eat me, but he only caught me half track (mph at 120, if he hooked it would be a monster)

That new chally i raced in my fastest pass was funny....in the staging lanes the guy starts saying that my 60's were slow, how is old capri ran 1.30' 60" foots in the 12's, blah blah blah...then I took his SRT8 challenger out like nothing, and he didnt say much after

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when its green i dump the clutch and let go of the two step button on the shifter at the exact same time. I have beefed up the car for abuse for this year since last year I broke everything...But i love racing a stick, nothing funner than banging every gear with my right foot down the whole time

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Ok I see you have the button on the shifter so that
wouldnt be the issue with the clutch... its common
for the chips in the 2 step to be off on the RPM
(200-400 rpm off) so try putting in a higher chip

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Hey Mr. P, Ive checked the chip, its definitely working ok as I saw it sitting on 5k when I was at the line...im going to upload a video right of the inside and of the car hitting the tire

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yea, i know, but what can you do right? I wanted to go, and it was the only time I could. Today is an OSCA weekend, with qualifying starting at around 2, so i figured i'd get more runs in on a non even night than an event day. Going back next Friday probably, and possibly staying over for the saturday test and tune as well

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Cool I may come down Saturday for some test and tune too!

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pm me if you do with what your car and your rig is and stuff so we can meet up possibly! Would be nice to meet another mopar guy and a moparts member at that too!

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Sounds like a decent first track visit. I assume you have secondary jet extentions?

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If you have it matted when launching, squirters and pump cams won't help you.

If it's a bit lean up top, when you dump the clutch and load the engine off the two step, I bet it's spiking even leaner. Jet it up and see how it reacts. I'd try the jetting Brian suggested. Also look up the factory jetting for the carb and note the jet stagger front to rear and try to run that stagger, or real close, if no PV in rear.

You have plenty of stuff to try. Personally, I'd start with getting the carb jetted for max MPH, then start tweeking with other stuff.

Yes you need a notched float to run those jet extensions.

It's all trial and error.

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