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need help with 1/8 mile times

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touchngo

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Discussion starter · #1 ·
Here is my problem, the local track (1/8) mile is overrun with mustangs.I finally go to run and have a lousy 9.0 run! The car is a 69 SS with a 427, 350 auto,(1400 stall),12 bolt with 3:55 gears. Solid body mounts, subframe connectors, ssm lift bars, with 255x60 TA's.The motor: 750 holley vac. sec.,performer intake,headers, duals to the rear, heads and intake ported, the heads have 454 valves, the sig erson cam has 228 @ .050" , 470 lift and I believe 288 total duration. Hei ignition with a aftermarket coil, the rest of the motor is factory parts. My times are: 2.2 60 ft 9.0 ET @ 81.5 mph.Is this the best I can hope for with this?
 
Discussion starter · #3 ·
traction is a problem, I can run mickey ET streets and still run in that class, probably a 26" to help with the 3:55 gear. I just put the gear in an dont want to go any lower for the highway driving.
 
#4 ·
not only is the sixty foot off, the mph seems kinda slow
what rpm are you crossing the traps at?

for comparison my 94 Z28 has a best 1/8th of 7.84 @ 86.5 on a 1.68 sixty


------------------
'68 Camaro (Baby) - 333, 200-4R, custom interior and paint, 12bolt going in soon
'94 Z28 (Pepe) - stock heads/cam and 3.23 gears - 12.44 @ 106+ 1.68 sixty, all motor
a few other toys
some pics on the page: http://fastz28.cz28.com
 
#5 ·
sorry, I gotta add to the last one, my post count is low so cut me some slack

get a higher stall converter!

radial ta's can stand a little warming up and drop the pressure to 20
get some skinnies/biguns w/ some et streets or drag ta's
is your hei modified for use over 4500 rpms?
and that's a tiny cam for a 427, bet it idles really docile eh?
and lastly do you have headers?
 
#7 ·
def too small a cam for a 427, you need to be up around .550 lift and and 230-240 duration@.50 for some decent performance,but go with some drag radials first then when 60's come down you need to let that motor breath a bit
Jake
 
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Discussion starter · #8 ·
I dont have the cam card anymore, but it idles pretty rough now, brakes get border line because of low vacuum maybe I'm wrong with the numbers. I have a stock 454 SS pick-up ,now it idles like a baby, but I still can pull a 2.2 60' with it and it weighs in at 4570 lbs.I shift about 5200 rpm,the trap rpms I'll have to run again to know. The hei has a msd module and hypertech coil. The header measure 2.2" (on the outside walls). Does anyone run 1.8 rockers?,, to get more lift. The stall convertor is on the list to do, a shift kit is going in this week. Thanks for the replies.
 
#9 ·
How is your timing set up? Are you running enough advance? Your cam is fairly mild so I wonder about the rough idle. Is the carb adjusted properly and are the wires good?

------------------
Bob
Garnet Red 69/SS396/TH400/355 Posi ( 454 now)
94 HD Dyna Wideglide
 
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Discussion starter · #10 ·
the wires are new, I've played with the timing and 12 degrees works good with out knocking as long as I run 100 octane.I took off a Qjet because I thought the primary needles kept lifting due to the low vacuum,I gave in to the holley crowd and traded for the 750. It has no where near the power but doesnt load up anymore.it doesnt have rear jets, just the plate, so I cant richen up the secondaries. The cam worries me now , I looked at some other cam specs and this really would be a weak cam so I must be wrong with the numbers. It really starts to pull strong around 4500 but I shift shortly later.(whats a safe rpm with stock rods and pistons? for $75 I can do an enertia dyno to see what kind of numbers and where I'm making power. I can check to see what the lift with an indicator but the duration???
 
#11 ·
<BLOCKQUOTE>quote:</font><HR>Originally posted by oger:
You have too much low speed torque for your chassis. Definately don't change the convertor until the chassis and tires can take it.

<HR></BLOCKQUOTE>


I totally have to disagree. The right converter will put drop his times immensely and won't kill his drivability, 1400 is too small
also try shifting where it feels best, if that is higher than 5200 then do it, your engine won't mind 6000 or higher w/ stock internals
I also believe the cam specs given are wrong or it's installed wrong or something is way off w/ the whole timing and/or fuel side of things, address the current setup before you make changes like 1.8 rockers and all that

what is your approx compression that you've gotta run 100 octane?
my 68 is @ 10.25:1+ and I run 93 no prob
give us all the specifics you can, I believe someone here can help you out
 
#12 ·
If I were you, I wouldn't buy anything until I knew exactly what I had and how it was put together. Making changes based on speculated sizes won't give you the most bang for your buck. Here’s a link to a Pontiac wagon that has run 7.15 in the eighth using a very mild combination: http://www.boyleworks.com/ta400/psp/rebuild455jh00.html


------------------
1967 Nova coupe daily driver
406, 10:1, 224° cam, Q-jet, 700R4, 3465# w/driver
11.75 @ 117 thru the mufflers
18 mpg on the road
 
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Discussion starter · #13 ·
the engine is a 69 335 hp, with 100cc heads, 10.25 compression. it will run on 93 with the timing at 8, but access to 100 LL lets me run more timing cheaper. the plugs are gapped @ .045" it went from 9.4 to 9.0 last week when I changed from a 3:07 gear to the 3:55. the cam was installed straight up , it cranks fine, I will do a compression check.and some how look into what cam I have.can i put a plate on this 3310 carb to run jets ? or just get a different carb? at idle it seems to have a lot of overlap beacause it will burn your eyes , I have tried 69, 72, 74's in the primaries but no difference.
 
#14 ·
The cam and convertor are way too mild for a 427. I would look into the repo solid cam that is 540/560 and around 230* duration. I would suggest a convertor in the 3000rpm range and loosen up the front suspension for better transfer.ET streets on some 8-10" rims will compliment the changes well. This should be a low to mid 12 sec quarter mile setup at least.
 
#15 ·
fast; When I wrote my reply I assumed he had the cam that he gave the specs for. It appears he doesn't and from what I am reading he has too much cam for the combo. In that case a new convertor will help but he still needs to sort out the traction problems and probabily an intake change the Performer is not a performance manifold in any shape or form.
 
#16 ·
Traction is your biggest enemy right now. All the cam changes and torque convertor in the world is not going to fix the 2.2 60ft times. You are running 1/8 mile so the first 60ft is even more important cause you can't make up for it on the big end (like you can on a 1/4 mile strip). The very first thing I would do is get a decent tire and try again. Do you have traction bars? If not, get a set. You should be able top drop .4 -.6 off of the 60 ft without too much effort. Yes you can change the metering plate to a block and run jets. Sounds like you have a nice street car, no need to turn it into a race car (huge cam, high stall), unless you want to. That engine should make plenty of tourque down low, just the way it is. The key is getting that torque to the ground. A 26" tall tire would go great with those gears (3.55). Just remember 3.55's are not the optimum 1/8th mile gear. I think you should be able to shave a second off that ET with tires and tuning. Good luck and keep us posted, please.

Royce
 
Discussion starter · #17 ·
I have the SSM lift bars, but thats another problem. The rear shocks seem to be too short now and "top" out after I put the subframe connectors, solid body mounts and lift bars on. I guess until I determine my cam specs, I'm at a stand still with any engine mods. soon as I get that I will post and we can go from there. Thanks
 
#18 ·
the one question that hasn't been asked is how did these 2.2 sixties come about . . . spin? . . . bog or lack of power off the line? . . . sure the tires are a limiting factor *the big* but is it full spin or what? . . . how is he launching? off idle? stalling it up?
more cam, more converter (too a point of course)
but how about the low mph? fuel prob? will it rev higher than the 5200 you are shifting at? gimme more
hei's even w/ a coil and whatever just don't cut it high in the rpm range either

and oger, I agree w/ you, didn't mean to call your input faulty or anything, I think the cam is small, there is a HUGE prob somewhere and the converter is ridiculously small
the performer is great . . . on a 283! LOL
 
Discussion starter · #19 ·
I stall it to 1400. to keep from spinning really bad I cant nail it. there is no bog if I do just tires spinning.I did put in a posi. and I know tires are the next step for a better launch. I have an electric fuel pump in line with the mechanical. is this bad? and what do you suggest on the hei? It will turn up more ,,,how much I have never tried to find out beyond 6000 but it is still pulling well. just dont want to have to trailer it back home! going to pull a valve cover off monday and work on the cam info.
 
#20 ·
everyone has valid points. my feeling is find out what the cam is before buying a new one. tires? yeah, gotta get em to stick. you cant tell squat if your not hooking up, might as well race it on ice. converter? with that set-up, i would say 4500 at the minimum, still streetable with that. one question, why a 750 cfm carb? why not 850? feed the rat!
 
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