Darracq

iTrader: (1)

first time to track with the car. tring to figure out whey mph is so low.


1.704 60
5.031 330
7.83 1/8 86.61
10.328 1000 97.80
12.442 1/4 106.36

ran a 12.46 on another pass at 108.04 with a 1.7560

this is carbed,

Pro Stock John

iTrader: (34)

Why don't you list out:
-raceweight
-mods
-gearing
-tire size
-fuel system
-shift rpms

Darracq

iTrader: (1)

3000 race weight
1 3/4 long tubes
victor jr 750 vac
3.90 gears
275 60 15 mt drag radials

having some minor carb problems, like a hesitation off line,

shirt first about 5600 or it breaks up
shift 2nd about 5800

Pro Stock John

iTrader: (34)

I'd shift both shifts at 6100. I'd try to verify this. You can spin it higher if you have better valvesprings, and the car will pull to 6300 or so with 918's or even Z06 springs. My guess is that you are short shifting a bit.

You using the MSD box? Any pics?

Darracq

iTrader: (1)

yes msd box, i put my own curve in it, seemed to run a little better than the #1 pill, I have it set to be all in at 2500 at 32 degrees. Need to figure out why it breaks up in first but no other gear,

Pro Stock John

iTrader: (34)

Does it sound like it's rich or lean? Breaks up thru the exhaust? Try shifting higher for sure, you might be shifting a lot lower than you think you are. I'm thinking you should run 111-113mph what are you shooting for?

Darracq

iTrader: (1)

I have been having trouble with the carb, it blacks the plugs at idle, but it cleans them up some when i make a pass, I put some 68 jets in it and it would hardly run, hesitated poped real bad, put 72s in it and ran 100 times better, when i went to load up the car it backfired though the carb a few times so i took it off and drove it, but it didnt do it anymore, Maybe the plugs were getting fouled again, i am on the 2nd set, new plugs cleared it up first time when it was poping though carb. Power valve is new, i have messed with
the idle circuit,buterflys, cleaned the carb out about 5 times. bigger squirter,

I just need to figure out how to lean the idle out so it doesnt foul plugs.
110-112 mph would be ok, I just see all these stock internal cars in the 11s, i have a light car,

Let me know if you have any ideas.

Pro Stock John

iTrader: (34)

Put fuel injection on is my idea haha. I have not so found memories of having a 750 double pumper on the 350 LT1 in my 69 Z/28, ran good wide open but was soggy down low and would foul out plugs. If you could leave in the 1.4's you could run 11's.

Darracq

iTrader: (1)

I have a edge 3600 converter,really like it, not sure what kind of 60ft i can get out of it. I was just bringing it up a little trying not to blow the tires off like i did one pass,

Pro Stock John

iTrader: (34)

I saw in your other thread you posted having 2.5 exhaust through chokemasters?

I'm guessing you run true duals?

I'd try running no exhaust or cutouts to see what happens. Flowmaster mufflers sound cool but unless but most of their models are restrictive.

Darracq

iTrader: (1)

Well i think i got it fixed, took it to 6200 no problem,Cant wait to run it again.

5_02ls1

iTrader: (20)

i was gonna say that ,but i was beat to it.i set my car to shift at around 6k.since your carbed and dont have to worry about retuning an ecu,id put a cam in it.

Pro Stock John

iTrader: (34)

Sheeyit, put some 918 or Z06 springs in there and take it to 6300, car will pull.

Darracq

iTrader: (1)

I want to put a cam in it this year, but i want to see how good i can make the stock one work first, and i am broke right now lol.

kp

iTrader: (34)

Dont jet for idle, 72s are probably too small. You may also have to play with the springs on the vacuum chamber to get rid of the hesitation. Also if it backfired hard through the carb a couple times it may have popped the power valve and it will dump a lot of fuel at idle.

If you are looking for best ET I would suggest a four corner idle mechanincal secondary carb. Vac secondary 750 holley carbs arent the best carbs out there but they do work. Best way to tell if your jets are close is to take off the accelerator pump arm and keep jetting up untill the car just barely hesitates cracking the throttle with no accelerator pump when warm in nuetral. Then run close to that jet on all four corners, its the easiest way to start on an unknown combo..

Good luck with it, nothing wrong with a LS1 'bu wagon

Darracq

iTrader: (1)

Thanks, I changed the springs a few different times at the track they all ran pretty close to the same.plugs look about right after a pass with the 72s,i need to get rid of the metering block so i can change jets in secondaries, I like 750 vac`s had one on my nova that ran 10.50s at 130

00 Freak

iTrader: (34)

I would to see a pic of this car. I'm curious what it looks like. What a awesome sleeper.

Darracq

iTrader: (1)

I am having trouble with putfile. you should be able to search my name on the coversion form and see pics, but i will see if i can find some.

Darracq

iTrader: (1)

www.putfile.com/pic.php?img=4812943

Villain281H

iTrader: (5)

Definate agreement on the double pumper carb. 12.44 at 106 mph isn't off if you're using all the power, as my Nova with an old 350 combo ran 12.30s at 107 mph with a 1.66 60 foot. I agree it should be pulling to a higher rpm (unless the tach is reading low).

Good luck, and tuning to get the best from it is a part of the game!

Derek