Z-28 1/4 Mile Times
 

Just curious. Has any one run their Z at the strip? I don't remember what mine ran last Sept at the Grove.

Last year I was running headers( 2 1/2" Flowmaster system), stock ignition except for a Pertronics points replacement kit. Ran on stock BFG Radial T/A's. 3500 RPM launch / 6500 RPM shift points

I will post my times/mph tonight.

Re: Z-28 1/4 Mile Times
 

Fastest ET [email protected]
Fastest MPH [email protected]

Made a total of 9 runs with my those two runs being the last of the day, in the above order.

Re: Z-28 1/4 Mile Times
 

It's GREAT to see you stretching the legs on that thing!

And while I don't have a Z28, in one of our old mags (Hot Rod or SS&DI?) they had a project Z28 that they built over time...early in the build they played with it in the stock configuration and whittled the ET down to mid-13s...it was a '68 Z I believe, they put some gear in it, and played with the timing/jetting, but left the exhaust manifolds and such on the car. It's a good read...

Re: Z-28 1/4 Mile Times
 

I think I recall an old copy of Super Chevy where they messed with a '69 Z and got it into the 12's.

Re: Z-28 1/4 Mile Times
 

It may be the same article and I think they were close to breaking into the 11's. I'll have to look for that article.

Re: Z-28 1/4 Mile Times
 

I think my best time so far with "Little Hoss" is 13.01, which was last years first run at SYC?

This year at Kansas City, my best was 13.051 @ 106.60. So far my best 60' is 1.749, during my last run at Kansas. The temps where in the high 80's/low 90's, so I hope to go into the 12's soon, on a cooler day.

These times are with a stock motor, std/std (bore/comp), but of course help from the crossram, headers and slicks.

The second owner of my car used to run 11.50's with the crossram setup, but with an automatic. He won Bristol in '71 with that set-up, Stock Eliminator.

Re: Z-28 1/4 Mile Times
 

[ QUOTE ]
Fastest ET [email protected]
Fastest MPH [email protected]


Can some one explain why I have a higher speed on my slower run in this example?

Re: Z-28 1/4 Mile Times
 

Either you let off the gas at the end or you had a slow reaction time but quicker run..

Re: Z-28 1/4 Mile Times
 

I had a 78 Z28 back in high school, with L60-15's,Lakewood Traction Bars, Mr gasket air cleaner,Air shocks, Open headers, tarantula manifold and holly 780 carb I was running mid to low 14's and thats with the stock cam, heads, and clutch....Hard to belive this basically stock 175hp car with a few bolt ons was faster then the 302's....sometimes you just get a good motor. Eventually that stock cam expolded on a 5500 rpm shift into 5 pieces...

Re: Z-28 1/4 Mile Times
 

[ QUOTE ]
Can some one explain why I have a higher speed on my slower run in this example?

[/ QUOTE ]
Why? Physics...look at your time slip...I'm gonna guess you were slower to the 60' mark on the higher MPH run? A slower ET means *more* time to accellerate, thus a faster MPH...I've got a formula around here somewhere that shows the why/how, but I'm headed out the door. Anyway, it's not *always* the case, but holds true the majority of the time...it's usually more profound in faster cars...

Re: Z-28 1/4 Mile Times
 

If things work out, I hope to take it back this Sep with drag radials, good tune-up and now have a full MSD ign system. The problem I was seeing was that if I dumped the clutch too low the car would bog. If too high I would cook the tires. I don't think the wide ratio M20 works very well on the track.

Re: Z-28 1/4 Mile Times
 

Who wins the race between two stock Z's.....the '69 or '70 version?

Just curious.

Re: Z-28 1/4 Mile Times
 

[ QUOTE ]
Who wins the race between two stock Z's.....the '69 or '70 version?
Just curious.

[/ QUOTE ]
Same gear ratios I would say the 70, better aerodynamics and suspension. The 69,s are a better looking car though https://www.yenko.net/ubbthreads/imag...ins/tongue.gif

Re: Z-28 1/4 Mile Times
 

Until you put your glasses on !!!

Re: Z-28 1/4 Mile Times
 

I like all of the First Gen’s, the 70-72 plus the 80-81 Z/28… The 69 Styling is timeless. My favorite being the 70-1.
I have owned a 69 and a few 70’s through the years. The 80-81 Z/28 are real dogs but they look great. My 69
was a Screamer with that little DZ engine but lacked torque. Many years ago I managed mid 13’s at Atco with
my 69, it had a 4, 11 gear and headers The LT1 is a lot stronger in my opinion. GM really did their homework
when they designed The Second Generation Z/28 Camaro. It is a much better riding and handling car then the
1st gen. The 70 Z/28 LT1 engine with some tweaking and a tall gear are extremely quick. The DZ and LT1 both
liked to REV and with them solid lifter’s they Rev Real Fast. That’s why so many of them were Vented. It’s a
shame Rev Limiters were not readably available back then as they are now. I put MSD-6AL’s on all of my cars now.
Better safe then sorry….

Re: Z-28 1/4 Mile Times
 

[ QUOTE ]
Until you put your glasses on !!!

[/ QUOTE ]
I can see fine old man, Pop a few more vikes and take another look, then youll see it from my perspective https://www.yenko.net/ubbthreads/imag...ins/tongue.gif

Re: Z-28 1/4 Mile Times
 

MPH is actually measured as an average over the last 60' I think. More spin off the line would result in a slower ET but might give you a higher mph because once it gets traction it's in a higher rpm range allowing more speed at the end. Not sure if that has any validity to it so take it with a grain of salt or with a https://www.yenko.net/ubbthreads/imag...lins/beers.gif.

Re: Z-28 1/4 Mile Times
 

[ QUOTE ]
[ QUOTE ]
Who wins the race between two stock Z's.....the '69 or '70 version?
Just curious.

[/ QUOTE ]
Same gear ratios I would say the 70, better aerodynamics and suspension. The 69,s are a better looking car though https://www.yenko.net/ubbthreads/imag...ins/tongue.gif

[/ QUOTE ] LBI man....Sammy, the 70 would win because it has more power and torque. Same gears and trans???.......all day long the LT1 should win! https://www.yenko.net/ubbthreads/imag...ins/3gears.gif

Re: Z-28 1/4 Mile Times
 

[ QUOTE ]
[ QUOTE ]
[ QUOTE ]
Who wins the race between two stock Z's.....the '69 or '70 version?
Just curious.

[/ QUOTE ]
Same gear ratios I would say the 70, better aerodynamics and suspension. The 69,s are a better looking car though https://www.yenko.net/ubbthreads/imag...ins/tongue.gif

[/ QUOTE ] LBI man....Sammy, the 70 would win because it has more power and torque. Same gears and trans???.......all day long the LT1 should win! https://www.yenko.net/ubbthreads/imag...ins/3gears.gif

[/ QUOTE ]
Why do you think I have an LT-1 in my 69 Z https://www.yenko.net/ubbthreads/imag...ns/naughty.gif No better small block made, or motor for that matter, period.

Re: Z-28 1/4 Mile Times
 

What had more true horsepower, the 302 or LT-1? Bet its close.

Re: Z-28 1/4 Mile Times
 

[ QUOTE ]
What had more true horsepower, the 302 or LT-1? Bet its close.

[/ QUOTE ]

oh yeah!!!..well, I betcha my 70 is longer than your 69!!! https://www.yenko.net/ubbthreads/imag...ins/tongue.gif

https://www.yenko.net/ubbthreads/imag...mlins/haha.gif

Re: Z-28 1/4 Mile Times
 

Wasn't an LT-1 essentially very similar to a 302, with 48 more cubic inches? What advantages did a 302 have over an LT-1? https://www.yenko.net/ubbthreads/imag...lins/dunno.gif

Re: Z-28 1/4 Mile Times
 

Camshaft, for one thing...

Re: Z-28 1/4 Mile Times
 

[ QUOTE ]
Wasn't an LT-1 essentially very similar to a 302, with 48 more cubic inches? What advantages did a 302 have over an LT-1? https://www.yenko.net/ubbthreads/imag...lins/dunno.gif

[/ QUOTE ]None! No substitute for cubic inches. Joe, Your Yenko has more power, more torque and basically the same rpm range as my 302! Only difference is that the 302 can run in a lower class, but on the street the 02 has NO chance unless you miss a gear or something.

Re: Z-28 1/4 Mile Times
 

not much but you can wind them higher https://www.yenko.net/ubbthreads/imag...ns/naughty.gif https://www.yenko.net/ubbthreads/imag...lins/beers.gif

Re: Z-28 1/4 Mile Times
 

A little higher.

Re: Z-28 1/4 Mile Times
 

With the short stroke of the 302 and some serious compression it makes for an exciting ride. The short stroke enabled the 302 to wind to the moon, thats why a cross ram works well on it . Same pricipal as a tunnel ram. All upper rpm HP.

https://www.yenko.net/ubbthreads/imag...ins/3gears.gif

Re: Z-28 1/4 Mile Times
 

I have a 69 Z/28 that I love but I will still take the LT-1.

Re: Z-28 1/4 Mile Times
 

I was replying to the "Whats the advantage of the 302 " I to will take the L-T1. Having restored both and driven them.

Re: Z-28 1/4 Mile Times
 

Question was, What is the true HORSEPOWER of each motor, They both must be right at 400, if so, in theory, the 302 has more per cubic inch which should be the faster motor but I can say as driven them both the LT-1 is quicker, but then again I am basing a stock 302 on a slightly beefed LT-1

Re: Z-28 1/4 Mile Times
 

I have an out sourced Dyno true engine Test booklet on Chevrolet engines.
They also road tested these cars:

1969 Camaro 302/290HP 4V @ 5800RPM with 290 torque @ 4200RPM & 11/1 compression.
Car weighed 3340 LBS.
LBS./BHP is 11.5
0 to 60 in 7 seconds
1/4 mile 14.8 seconds

1970 Camaro LT-1 350/360HP 4V @ 6000RPM with 380 torque @ 4000RPM & 11/1 compression.
Car weighed 3580 LBS.
LBS./BHP is 9.9
0 to 60 in 6.5 seconds
1/4 mile 15.4 seconds

Re: Z-28 1/4 Mile Times
 

True HP for the 302 is around 350.(stock) My opinion is the LT-1 is about 380 or so. NHRA rates the 302 at 305HP for stock eliminator. Jerry MacNeish in E/S is about 459 on the dyno. Remember that is everything at almost perfect specs with a super tune.

Re: Z-28 1/4 Mile Times
 

These are BS tests, who rev's a 302 to only 5,800? Engine isnt happy untill you hit 7,000 https://www.yenko.net/ubbthreads/imag...lins/smirk.gif
[ QUOTE ]
I have an out sourced Dyno true engine Test booklet on Chevrolet engines.
They also road tested these cars:

1969 Camaro 302/290HP 4V @ 5800RPM with 290 torque @ 4200RPM & 11/1 compression.
Car weighed 3340 LBS.
LBS./BHP is 11.5
0 to 60 in 7 seconds
1/4 mile 14.8 seconds

1970 Camaro LT-1 350/360HP 4V @ 6000RPM with 380 torque @ 4000RPM & 11/1 compression.
Car weighed 3580 LBS.
LBS./BHP is 9.9
0 to 60 in 6.5 seconds
1/4 mile 15.4 seconds

[/ QUOTE ]

Re: Z-28 1/4 Mile Times
 

[ QUOTE ]
True HP for the 302 is around 350.(stock) My opinion is the LT-1 is about 380 or so. NHRA rates the 302 at 305HP for stock eliminator. Jerry MacNeish in E/S is about 459 on the dyno. Remember that is everything at almost perfect specs with a super tune.

[/ QUOTE ]
Alright, so there you have it a STOCK 302 (Whith factory headers I am guessing) is pushing 350 which is 60 more than rated, the STOCK LT-1 rated at 370 is only pushing 10 more?...The 302 should be the better motor but we all know its not and I believe the reason is that the 302 comes from the factory pretty much maxed out and the LT-1 has alot more to go, Just adding the off road cam, headers and air cleaner will probably add 40 to 50 hp..So what is this saying? If I put a 302 in my 70 Z/28 and an LT-1 in my 69 Z/28 which is faster? what is more important power to weight or horsepower per cubic inch?...we can look at torque next..

Re: Z-28 1/4 Mile Times
 

I believe the LT-1 on the street is faster. Remember NHRA is horsepower to weight. So the LT-1 would have to be a little heavier. Believe it or not, I never see any 1970 Z/28's running with the LT-1 at the drags. The killer engine in my opinion is the 350/255hp. I think NHRA rates them at 274hp (I think) https://www.yenko.net/ubbthreads/imag...mlins/hmmm.gif They rate the 02 at 305. The cast iron intake, Q-jet and hydraulic cam doesn't effect the performance of the low hp 350 at the drags. Sam, If I had a 302 with a 3:73 gear and a 350/300 horse with a 4:10 gear both running good with headers,I think the 350 SS camaro may smoke the 02 camaro. https://www.yenko.net/ubbthreads/imag...emlins/eek.gif

Re: Z-28 1/4 Mile Times
 

[ QUOTE ]
I believe the LT-1 on the street is faster. Remember NHRA is horsepower to weight. So the LT-1 would have to be a little heavier. Believe it or not, I never see any 1970 Z/28's running with the LT-1 at the drags. The killer engine in my opinion is the 350/255hp. I think NHRA rates them at 274hp (I think) https://www.yenko.net/ubbthreads/imag...mlins/hmmm.gif They rate the 02 at 305. The cast iron intake, Q-jet and hydraulic cam doesn't effect the performance of the low hp 350 at the drags. Sam, If I had a 302 with a 3:73 gear and a 350/300 horse with a 4:10 gear both running good with headers,I think the 350 SS camaro may smoke the 02 camaro. https://www.yenko.net/ubbthreads/imag...emlins/eek.gif

[/ QUOTE ]
No way, that small of gearing will not make the difference in 50hp...

Re: Z-28 1/4 Mile Times
 

I don't know about that Sammy! https://www.yenko.net/ubbthreads/imag...lins/dunno.gif

Re: Z-28 1/4 Mile Times
 

Your telling me that an 69 SS 350 with 4.11 will whoop a 69 Z/28 with 3.73 https://www.yenko.net/ubbthreads/imag...lins/crazy.gif https://www.yenko.net/ubbthreads/imag...emlins/eek.gif https://www.yenko.net/ubbthreads/imag...lins/smirk.gif https://www.yenko.net/ubbthreads/imag...mlins/grin.gif https://www.yenko.net/ubbthreads/images/graemlins/no.gif I dont think so...

Re: Z-28 1/4 Mile Times
 

With me driving it will! https://www.yenko.net/ubbthreads/imag...ns/naughty.gif

Re: Z-28 1/4 Mile Times
 

Jeff,
The first MPH timer is 66' before the finish line, and the second is 66' after the line. (132' total, 1/10th of the 1320 quarter). The average MPH over that distance "hypothetically" occurs at the halfway point, or the finish line. Of course, depending on where the car is in it's rpm/horsepower band, the actual MPH at the finish line might be quite different than what the time slip says. After all, the car is accelerating.
Which, by the way, brings up a certain way to have a lower MPH on a quicker ET run. Just let off the gas as soon as you cross the finish line, a little before the final MPH light.

Verne https://www.yenko.net/ubbthreads/imag...ins/3gears.gif