finally into 12s [Archive] - Chevelle Tech

: finally into 12s


slpin
Dec 4th, 04, 10:34 PM
went to sac tnt tonight
nice seeing some of you guys out there
jeff, craig, tony, etc

im happy, i finally got into 12s and i didnt change anything on the car since last time either...

60ft. 2.041
330ft. 5.502
1/8. 8.337
MPH 86.997
ET. 12.875
MPH 107.963

got a 108.328mph as my best mph run

wonder what will happen if i change from 3.31 to 4.1 and some tires other than 255....

Slowpoke70
Dec 4th, 04, 11:08 PM
graemlins/thumbsup.gif

I say try some sticky tires. Your 60ft is on par with some of the small block chevelles I've been around, but you'd out run them all down the track.

mr 4 speed
Dec 5th, 04, 8:02 AM
Alan,nice job graemlins/thumbsup.gif :cool:

..please get some sticky tires..theres mid 12's or quicker there with some hook,which you won't get with street tires.

Bob West
Dec 5th, 04, 9:03 AM
12.30's with that mph, I ran a best of 12.69 on Cooper Cobras, then stickies and tuning netted the 11.78,,,drag radials thru the exhaust 11.84 :D

slpin
Dec 5th, 04, 2:09 PM
thanks for the good words, all.
heh, i really think i need better tires!
im happy that i finally got into the 12s
didnt lower the tire pressure or anything
just drove there and ran. smile.gif

kjett
Dec 5th, 04, 2:12 PM
Congrat! Breaking into the 12's is a nice accomplishment, especially with street tires. Looking into my crystal ball, I can see you next post.... "What will it take to get into the 11's" :D

slpin
Dec 5th, 04, 2:18 PM
hey! that was exactly what i had in mind!... hmm, maybe its time for a new cam and new heads... he he!

Motor Martyr
Dec 5th, 04, 4:26 PM
picking up 21mph, do jetting and timing loops, 23-24mph is about optimal for most street/strip cars in that power range

Slowpoke70
Dec 5th, 04, 4:38 PM
Hi Brian,

What's the order of operations on doing pump cam/jetting/ timing "loops" as you call them?

(Sorry to hi-jack your post, Alan.)

slpin
Dec 5th, 04, 7:36 PM
Brian

i think it might be due to my transmission shifting from 2nd to 3rd - it shifts very slow, like a stock transmission.... 1st to 2nd are firm though

also, i think i have a little surging up in 3rd gear, seems to pull, not as hard, pulls harder, i guess i have a little detonation? cant hear any though


no problems, Enrique

kinzli
Dec 5th, 04, 10:38 PM
Alan, you did good yesterday, and it was cool to finally meet in person. Getting a big sled down the track in 12 seconds is an accomplishment that you should be proud of.

Yes, tires will make a big difference I think (for you and me both!).

Oh, and tell your friend thanks for doing the vids for us, they turned out great, I'll post 'em soon.

Wolfplace
Dec 5th, 04, 10:58 PM
All right Alan graemlins/beers.gif

I knew you had it in there as you have just kept improving,, piece by piece
Just some traction is going to put you deep in the 12's

Congratulations,, must have been all them "secret trick parts" you bought from what's his name with the wolves,,, :D

Only thing, if it felt like it was "surging" in high you want to get a fuel pressure gauge on there to be sure you are not runnin out of fuel,,,
you might want to either add some jet or reduce the timing depending on where it is if the fuel pressure looks ok at speed.

mr68
Dec 6th, 04, 7:49 AM
good for you alan!

91 Camaro
Dec 6th, 04, 11:13 AM
Congrats Alan!

Looks like shes still got more steam to lower those ,already, awesome numbers even more with small tuning and traction even!

THORSS70
Dec 6th, 04, 12:23 PM
Right on Alan, very nice runs bud :cool:

Your car is so quiet too, and very mellow idle.

I hope to see you in the 11's one day smile.gif


Again, congrats!

slpin
Dec 6th, 04, 4:13 PM
thank you all for the good words
i am definately going to try better tires in the future
and maybe a little porting and a little bigger cam...
i will check the fuel pressure and back off the timing a bit, but one thing i know is, my timing is way off and i really dont know where it is at...
craig, i sure hope i can be in 11s one day... you are just a set of tires off of 11s!

Motor Martyr
Dec 6th, 04, 5:55 PM
enrique,
By a loop, i mean you will do a change in timing until you find where it MPH/ET's best, then do jetting changes (more first) until you find what it likes, then you might want to try squirter changes if you have a bog. After all go through them again and see if what it "likes" changes.

i havent had much success with tuning this season since i'm not legal for the et's i run when making a full power pass.
However i know i'm "close" as my car picks up over 23mph on the back half.

slpin, start with the timing, beg or barrow a timing light and set it to come in at 36 degrees (total) and work from there.

slpin
Dec 6th, 04, 5:57 PM
Brian

the problem with mine is, i have a dialback timing light, and the regular timing tab

they dont agree with each other, so it amkes it confusing...

dialback says i have 20 degrees initial, while the stock timing tab says 12 degrees......

Motor Martyr
Dec 6th, 04, 9:56 PM
did you check to see if TDC and the 0 mark agree with one another when assembling the engine?

tried any other lights?

Slowpoke70
Dec 6th, 04, 10:15 PM
Thanks. Should I jet up even if it smells rich while putting around on the street?

Motor Martyr
Dec 6th, 04, 10:43 PM
a rich idle circuit combined with a reletively large duration cam will have a rich smell at idle. Has nothing to do with the WOT/underload air/fuel ratio. Do the testing at the track though, otherwise you'll never know of the results.

Wolfplace
Dec 6th, 04, 11:19 PM
Originally posted by slpin:
Brian

the problem with mine is, i have a dialback timing light, and the regular timing tab

they dont agree with each other, so it amkes it confusing...

dialback says i have 20 degrees initial, while the stock timing tab says 12 degrees...... Alan,
As Brian said, first check that your zero mark is accurate.

Then measure the circumference of the damper or calculate it from diameter & divide by 10.

Take this number & measure from your reference mark on your damper & make another mark.
This will be 36 degrees.

Use it for total timing with a standard timing light or yours with the dial back turned off & then you can check your dial back deal to see if it agrees.

It would also be a good idea to check it with a nice simple standard timing light too just to be sure your trick one is accurate. ;)

But you want to start with a known 36 degrees of timing & then play with jetting.

You might also want to be sure you are not running out of fuel before doing a bunch of tuning ;)

BillsCamino
Dec 6th, 04, 11:27 PM
Some dial back timing lights do not work accurately when used on an engine with MSD ignition.

sobever066
Dec 7th, 04, 12:31 AM
My snap-on timing light is not accurate with my msd ignition. I use my bosses older timing light to time my engine.