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prettyboyced 07-30-2012 09:42 AM

Need help with track times
 
I have 1986 Monte Carlo SS stock suspension with 90/10 shocks and drag radials I have a 355 afr 190s xfi280 .576,.570 cam rpm intake with 1inch spacer 650 edelbrock carb 1 3/4 headers timing set at 36 total 2400 stall 350th trans my slip was an 9.2 1/8 mile 79mph with 2.1 60ft

zildjian4life218 07-30-2012 10:08 AM

Quote:

Originally Posted by prettyboyced (Post 1578479)
I have 1986 Monte Carlo SS stock suspension with 90/10 shocks and drag radials I have a 355 afr 190s xfi280 .576,.570 cam rpm intake with 1inch spacer 650 edelbrock carb 1 3/4 headers timing set at 36 total 2400 stall 350th trans my slip was an 9.2 1/8 mile 79mph with 2.1 60ft

How is the timing curve setup? What do the plugs looks like. I ran my Olds Cutlass with a 350, smog era heads, and a carb and intake and went into the 8s so there is something wrong with your setup.

prettyboyced 07-30-2012 10:12 AM

Initial is 24 and total 36 mech 12 and I haven't checked plugs after wot passed

zildjian4life218 07-30-2012 10:35 AM

Quote:

Originally Posted by prettyboyced (Post 1578487)
Initial is 24 and total 36 mech 12 and I haven't checked plugs after wot passed

What is the duration on the camshaft? What is the fuel pressure going to the carb?

is this it http://www.jegs.com/i/Comp-Cams/249/...rentProductId=
If that is the cam I would be thinking more converter with those figures.

prettyboyced 07-30-2012 10:47 AM

Yes that the cam and 5.5 psi

joelster 07-30-2012 05:42 PM

I would swap the carb for a 750 vacuum secondary Holley type, preferably with a metering plate on the secondaries. It will be substantially easier to tune it that way. Get the spring kit for the secondaries and a jet kit with 1 of every set.

That's a healthy cam for 355 cubes and you have pretty good heads. It will want to run with a converter higher than what you have now. I'd rock a 4k converter with a set of 3.73's and a 26 or 27" tire.

vinniekq2 07-30-2012 07:10 PM

I would consider a 3800 stall or there abouts,750 hp double pumper,and what ever manifold is one step below victor Jr.your 60' times needs to be 3/10 quicker at least.
do the manifold/carb swap first and see where the power is,then re determine the stall you need for racing.

what gears are you using?that also can be optimised after carb/manifold swap

2wld4u 07-30-2012 10:11 PM

You should be running low 8's high 7's at least. Your 60 is pretty bad as well
.... a 355 with 9:1 and a summit 234/244@.05 Hyd flat. Rpm intake and a 750 Holley Dp with 373:1 and a 3000 stall in a 69 chevelle runs 8.2 with mildly ported 462's and will go faster he just ran it 2times to get a time slip...with nitrous he blew the tires and ran mid 7's with a 150 shot...

F-BIRD'88 07-30-2012 11:03 PM

Something is drasticly wrong with your car. It should be running a lot faster.
Something is killing the horsepower. (79MPH)
Are you running up hill ...or?

I'd start with a simple compression test.

I'd expect much stronger performance from it.

prettyboyced 07-31-2012 07:18 AM

I have 3.73s and 28inch tire I just got 3500-4000 stall made so I will be putting that in this weekend and 600 carb was big enough for a 350

cdminter59 07-31-2012 08:46 AM

track times
 
What everyone is telling you is with the cam you are running the 600 carburetor is not enough. If your main interest is track times and not a daily driver, you could go with a single plane intake and Holley 750 carburetor.

zildjian4life218 07-31-2012 09:04 AM

Quote:

Originally Posted by prettyboyced (Post 1578780)
I have 3.73s and 28inch tire I just got 3500-4000 stall made so I will be putting that in this weekend and 600 carb was big enough for a 350

How did you figure out your cfm requirements? Did you factor in VE and rpm? Real test is to hook up a vacuum gauge and watch your manifold vacuum at WOT and if your vacuum goes above a couple inches you don't have enough carb. The article I read that on was more race oriented so idk how far off that is for a street/strip deal.

cobalt327 07-31-2012 11:12 AM

Intake and carb isn't killing it that bad unless the a/f ratio is whacked. The 60' is s l o w. You should be in the 1.7-ish range. Unless you are spinning the TC is too tight so the new converter should help unless the car's spinning.

Pay close attention to the shift points. Most guys over rev the engine thinking they'll go quicker if they tach it out to 7K rpm. You want to shift about 10% past the power peak.

2wld4u 07-31-2012 11:53 AM

its funny, there was a guy who had a ford truck with a 429 CJ built nicely with cam, intake, headers, ignition and a 800 cfm edelbrock, and it did run good...or so he thought...I at the time had a 68 cougar with a 357W about a 400hp build with world products heads 1 3/4 headers weiand stealth intake and a 750 hp series holley... he liked the look of the carb and was astonished at how good it ran and wanted to try my carb, well after several weeks of asking i let him borrow it...HE DIDNT want to give it back... :drunk: lol and you know I traded a mustang was an 89 for a 79 f-100 with a mild 460 and with msd ignition upgrade and yes I swaped that same 750 hp holley on that truck with 33's ... i did outrun the same mustang in the 1/4 i traded with a TRUCK! >.< whitch did yea it had a edelbrock on it beforehand as well, they are good carbs but you dont see many FAST cars running edelbrock carbs...wonder why?

you have really good heads, decent intake, and you try for gas mileage from an edelbrock? i just i dunno....i wanna be mean but there are so many people that do the same thing....so ill just say to each there own but the proof is in the pudding, if you want to go faster start thinking more of performance than gas mileage...


Id rather use a holley avenger vac secondary series carb than a edelbrock anyday they are really good carbs vac secondary the 770 works really well on 450hp builds.. even as small as 347 cid...and that is TRACK proven performance...

prettyboyced 07-31-2012 11:57 AM

I thought the intake rpm performer was good since I don't rev to high and I shift at 6k since after that I have valve float and I don't spin off the line at all but this is not my daily driver so I could move to a 750 but I'm pretty sure my a/f is pretty good with the 600


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