Black RS/Z & the 1/8 mile... any suggestions?

[firstgenaddict]

We are going to take the Black RS/Z to the drag strip tonight... got some MT ET streets 8.5 tread width 26" tall.
Been out doing launches on the street and figure we are going to have to launch around 5500RPM to keep the Revs up and shift it around 7000-7200...
May have to richen up the secondaries...
Anyone else been dragging a fairly stock 69 Z?
Any suggestions?

It really has a day 2 look with the M/T's mounted on Ralley wheels. http://www.yenko.net/ubbthreads/images/graemlins/cool.gif

[Chevy454]

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figure we are going to have to launch around 5500RPM to keep the Revs up

[/ QUOTE ]
What have you got for suspension mods...and I hope you have a good driveshaft loop!

[firstgenaddict]

The good lakewood traction bars and hurst drag shocks on the front.
We were out on the street launching it at 4000-4500 and it would spin for 10-15 ft and when it would get traction it would bog a little...

[Chevy454]

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The good lakewood traction bars and hurst drag shocks on the front.

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It's gonna wanna hook...like I said, I hope you have a good loop!

My prediction: 12.60s @ 106 http://www.yenko.net/ubbthreads/images/graemlins/biggthumpup.gif

[ORIGLS6]

" My prediction: 12.60s @ 106 http://www.yenko.net/ubbthreads/images/graemlins/biggthumpup.gif "

1/8 mile?

ET sucks but the speed is impressive! http://www.yenko.net/ubbthreads/images/graemlins/grin.gif

[mockingbird812]

Thot this was 1/8th mile. What gears?

[firstgenaddict]

Rob... we are going 1/8 mile... closest 1/4 is Atlanta... 2.5 hrs away...

[Chevy454]

Whoa, whoa, whoa, I missed the 1/8 mile part! Thanks for lookin' out for me, D!!

With that said, I'd better go with 8.0s @ 88

[ORIGLS6]

http://www.yenko.net/ubbthreads/images/graemlins/biggthumpup.gif http://www.yenko.net/ubbthreads/images/graemlins/flag.gif

[Chevy454]

Hey, post a picture of the car...a black Z with stickies on rallys...NICE! http://www.yenko.net/ubbthreads/images/graemlins/drool.gif

Good luck to ya...only things I can think of are make sure your timing is in quickly, and might wanna go to a lighter secondary spring...bad thing about a small block is they're a little more finicky about launch rpm and what not...a big block has a little more torque so can go from anywhere, but sometimes it's either bog or spin with a small cube...where's Sammy, I bet he's full of "good info" on small blocks! http://www.yenko.net/ubbthreads/images/graemlins/grin.gif

[firstgenaddict]

I've got the 480 all in Quickly... with as much initial as it can stand and still crank.

It will be running 110 leaded...
I am mainly worried about being lean on the top...
I can't remember if I put 68 72's in the carb or 72 76's...



I will have the camera... we are going to try to get some good shots of it launching...

It looks so freaking sweet with the M/T's on rally's, the Yellow Lakewoods peeking out, and the Torque Thrusts on the front...
We are going to drive it like it was meant to be driven!!!

[Salvatore]

What gear is in it? M21 trans? Don't need it to fat in the heat. You can pretty much leave the motor alone. The work needing to be done is at the rear of the car on a Z/28. http://www.yenko.net/ubbthreads/images/graemlins/3gears.gif

[10/10_RS/Z28]

Car ran a best of 9.16 @ about 74mph, 60 ft. times average about 2.0. The time was terribly disapointing! We need to change a couple things and I think 8.75 is maybe possible.
We had alot of fun and did'nt break anything, so it was all in all a pretty good Thursday night. James has a couple of pictures to post. http://www.yenko.net/ubbthreads/images/graemlins/headbang.gif http://www.yenko.net/ubbthreads/images/graemlins/headbang.gif http://www.yenko.net/ubbthreads/images/graemlins/biggthumpup.gif

[Salvatore]

If the motor isn't to tired it is ALL in the rear and putting an M20 trans in. http://www.yenko.net/ubbthreads/images/graemlins/3gears.gif Post the pictures!!! http://www.yenko.net/ubbthreads/images/graemlins/biggthumpup.gif

[firstgenaddict]

It has a M20... the motor is running out of fuel on the top, plus the points are bouncing at 7200...

[Salvatore]

It may ET better at 6500-6700 rpm's. Are you running at least a 4:56? I am running 72's and 78's in the 780. Mine feels the strongest at about 6700 with a 4:10 rear and an M21. Mine needs at least a 4:56 to feel like anything. Its a dog!!http://www.yenko.net/ubbthreads/images/graemlins/dunno.gif

[Chevy454]

I like blocking the rear PV on our 780s...it seems a lot more consistent. You sure that thing is running out of fuel?

[firstgenaddict]

The plugs are awfully white... Didn't have any larger jets with us last night...
Only have a 4:10...
How much worse would 4:56's be driving on the street?
4:88-5:13's would really pick it up.

OBTW- 2.00 60 foot times...

[firstgenaddict]

Hey Rob when you block the PV how many jet sizes do you need to go up?

[Chevy454]

We have 4.56s in the Sub, and they ain't a whole lot worse...unless you're gonna be doing extended freeway duty? I think a jump of 6-8 is the rule of thumb, but I'd have to check my notebook to see where ours fell...our L72 is probably jetted a *lot* smaller than most of you guys would guess...

[ORIGLS6]

4.88 or 5.13s are believable gears for an 1/8 mile with a Z. We had a couple of guys running 5.38s in SBCs at our old track.
There was one guy who ran a 5.13 in his SBC '61 Impala, and ran 1/4 mile. The car was named "The Twister", for obvious reasons. If I recall correctly, he hit the traps at around 8200. http://www.yenko.net/ubbthreads/images/graemlins/eek.gif http://www.yenko.net/ubbthreads/images/graemlins/worship.gif

[Chevy454]

And the thing ya gotta remember, when going to stickies most guys jump up to like a 29" or 30" tall tire, which has at least a couple inches in height over the stock tire, which *really* compounds a gearing problem on a small block...

Would be hard to justify gearing it for the tall tires & the 1/8 mile if you mainly drive the car and only hit the track once or twice a year...but steep gears are FUN!

[Salvatore]

4:56's on the street with 27-28" tires is fine in my book. Plugs are white? Depends on how many runs you have on them. May not have shown any color yet. What heat range plugs are you running and are the float levels a little low? Maybe the valve springs are weak at 7,200 rpm's. Points may be good. Motor has to be pretty cool between runs if you want to make some power. Maybe to hot down where you are. Ice, ice and more ice! http://www.yenko.net/ubbthreads/images/graemlins/dunno.gif

[firstgenaddict]

We did not cool between runs at all... made a pass then came right back around and made another would let her rest maybe 15 min every 2-3 passes.

Floating valves are the least of my worries... it has oversized double springs with dampers and all are shimmed to have the same seat pressure. Engine guy does nothing but drag racing SB's and said the motor would easily turn 8500.

Running stock AC delcos... stock heat range.

We are running 26" tires... the same height as the Wide Treads... had them down to 15# pressure...

One of my friends has 5:13's in his 69 Nova with a 60 over 396.... it runs 7.40's.

[Salvatore]

Try a plug change and maybe setting the floats up a little. That may be the cause of you running out of gas. Low float levels. Probably best bet for the 1/8th mile is a 4:88 for that little motor. http://www.yenko.net/ubbthreads/images/graemlins/dunno.gif

[firstgenaddict]

Photos... William driving...

http://www.yenko.net/photos/data/500/Wm_69_RSZ_dragstrip_small.jpg

http://www.yenko.net/photos/data/500/69_RSZ_Dragstrip_Launch.jpg

[Salvatore]

I like it!!! http://www.yenko.net/ubbthreads/images/graemlins/grin.gif http://www.yenko.net/ubbthreads/images/graemlins/3gears.gif

[John Brown]

I used to run 5.38's and a 40 pound flywheel back in 68/69 in my 68 Z. I ran 12.50's @ 117 in the 1/4. RPM was crazy. That was good for about a 8.10 in the 1/8. Tires are a lot better today too. 5.38's caught a lot of people off guard on the street too !! http://www.yenko.net/ubbthreads/images/graemlins/eek.gif

[firstgenaddict]

Colder or hotter on the plugs Sam?

[firstgenaddict]

I was wondering if I ran some more tire pressure would it cause the tires to spin a little more and not cause it to bog so much when

We let some air out of the tires and the car hooked better, but the ET's went up... could it be that hooking quicker is causing the motor to bog because the car is not moving forward as fast as it was when the tires were spinning more??? (it may sound crazy but thinking about how the car felt and what the RPM's did when it came off the line and the tires caught, this seems possible)

[Salvatore]

Better get Rob in on that tire stuff! I like colder plugs at the track.

[firstgenaddict]

You guys should have seen some of the looks and heard the comments from people... like what in the hell are you doing racing a 45k mile original car?

Ummm http://www.yenko.net/ubbthreads/images/graemlins/dunno.gif maybe because thats what it was built to do...http://www.yenko.net/ubbthreads/images/graemlins/3gears.gif

[DarrenX33]

[ QUOTE ]
Better get Rob in on that tire stuff! I like colder plugs at the track.

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Do some burnouts and make sure you have all the tire on the ground.. That was Rob's advice to me at Gateway when I ran my car.

[ORIGLS6]

http://www.yenko.net/ubbthreads/images/graemlins/biggthumpup.gif http://www.yenko.net/ubbthreads/images/graemlins/biggthumpup.gif

And don't be surprised if you go WAY up in pressure. I think Rob is running between 42 and 45 PSI in the Polyglas, and I went to 42 before I got away from the strong edge marks. Even with the 275-14 ProTracs I was up in the high 30s to get an even pattern.
May be quite a bit different if you're running drag radials though.

[firstgenaddict]

They are not radials...

[YENKO DEUCE REGISTRY]

I'm surprised they let you race with the drivers side window down?

[Shankin]

When running slicks i never go above 13psi and never below 9.5. Getting that car out of the hole is everything.To much spin will not go anywhere but all hook will bog the little motor. Also a good idea would be to get the car on a chassis dyno to get the jetting just right. Only trapping 74 in the 1/8th is only showing about 230 hp to the tires.

[Bryan64Impala]

I recognize the track. You are racing at Greer Dragway in Greer, SC. Wondering if you are going back anytime soon. Let me know and I'll drive my black 69 down and maybe meet up and shoot the breeze. I haven't raced my car but go to the track about once a month. My car has 62,000 original miles and has a 350 M/21 trans and a 12 bolt with 3.73's.

[firstgenaddict]

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I'm surprised they let you race with the drivers side window down?

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They will let you do about anything down there... racing 4 wheelers and dirt bikes... LOL