Classic Engine Tech 1967 - 1981 Engine Related

81 z28 1/4 mile times

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Old Oct 2, 2003 | 08:50 PM
  #1  
unvc92camarors's Avatar
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From: cinci
81 z28 1/4 mile times

anyone know what one runs stock?
i'm considering gettin one if this other car doesnt work out
i know they were like the slowest of the generation but...they are neat cars (specially the hood flap things popping open )
i mean, i have a rs that runs high 16's and i dont need a v8 that does that.
so anybody got a clue? or where you could point me to find out?
i tried nastyz28.com and car-stats.com but couldnt find it
any help is appreciated
thanks
Old Oct 2, 2003 | 09:00 PM
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1980Z28's Avatar
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both mine and my buddies 1980's ran between 15.60-15.80 at mission. and they were both stock.
Old Oct 2, 2003 | 09:25 PM
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unvc92camarors's Avatar
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were they 350's?
i know in 81 they made 350 optional and 305 was standard.
Old Oct 3, 2003 | 07:22 AM
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high 15s, low 16s. Simply put, when stock, they are slow cars.

However, I had an '81 4-speed car. I stuffed a very mild Edelbrock cam (204/214, .420/.442) into a stock 305 (LG4), put a Performer manifold on top, put in a true dual exhaust (with cats), and brought my time down from 16.5 (stock) to 15.2.

My current 1980- stock 350/auto combo was good for about 16.1@84. I put Trick Flow heads, Comp Cam 268H, Performer, Dynomax 1.625" headers, and dual exhaust (Flowmaster Force II, 2.5" mandrel-bent), and went 14.05@101 without much tweaking, with poor traction. The bottom end of the motor was (still is, in fact) stock LM1-350. I'm now running a ZZ4 roller cam, and have done some tweaking, and have good tires. I haven't been to the track lately, though. I'll go in a few weeks, and I expect 13.7ish@103 or so, if I can get a good hook.

You can look at my website for things you might want to do to a 2nd gen. (there's even a video of the "flaps" )

Todd
Old Oct 3, 2003 | 02:33 PM
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As a previous owner of a 1980 Z-28 I'd just like to say that the hood flaps rule!!! heh heh. I really liked those things. Stupid and cheesy, but actually functional and more fun than a barrel of monkeys.

Mine ran a mid 15 with true duals behind the stock exhaust manifolds and some tweaking of the stock carb and distributor.

Please note: 1981 was the first year for the computer controlled QJet and computer controlled HEI distributor- the same system that continued in use in 3rd gen carbureted Camaros up through 1987. If you can possibly replace the computer controlled carb and distributor with ones from an earlier Camaro, without getting in trouble with any visual emission inspections in your area, I would recommend you do it. It's a LOT easier to tune these things for higher performance with the computer out of the way. NOBODY makes a chip for a 1981 computer controlled Camaro, if you get my drift.
Old Oct 4, 2003 | 09:04 AM
  #6  
unvc92camarors's Avatar
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yea, that's why i like the 1st and 2nd gen cars (theyre all getting to be past emissions because theyre old, 25 years or older in my state=no emissions)
i don't think they even do visuals, i had my dad's 95 camaro in there the other day, all they did was sniffer pretty much, dont even think they went under the car
and yea, that's another reason 1st and 2nd gens are nice- no computers- cept for the 81 of course
it is comforting to know that a few mods will make them run pretty nice
thanks for the help guys
i'll let you know if i get the car
Old Oct 4, 2003 | 11:58 PM
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You know the 1981 is very similar to the 80 Z28.

see: http://www.nastyz28.com/camaro/camaro80.html#z28-test

But remember, the 4 speed 81Z would be a 305 only.
What's cool about this era car is you can stuff a little 454 under the hood and go surpise people. Yeah, 16.4 disco-mobile. It's all stock. Trust me.
Old Oct 5, 2003 | 12:59 AM
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14.05@101
wow todd u should be getting a better ET then that.

like 13.1x.... u much of has some serious traction problems.
Old Oct 5, 2003 | 03:51 PM
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wow todd u should be getting a better ET then that.

like 13.1x.... u much of has some serious traction problems.
I did have serious traction problems. 2.3x short times were the best I could do. I've got better tires now, but with the T56, 1.9s are probably a practical limit on street tires.

However, I haven't seen anyone here in Orlando run a 13.1 with only a 101mph trap speed. None of the street cars can do it. When I see 12.xx @104, I think "WTF? I've never seen anything like that." I don't know if it's the air (sea level basically, with much humidity), but that's how it is.

Todd
Old Oct 5, 2003 | 03:56 PM
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oh ya forgot about that... i live at sea level
Old Oct 6, 2003 | 12:27 PM
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So do I. The track is about 45' above sea level, according to my GPS.
Old Oct 8, 2003 | 03:00 PM
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Originally posted by Damon
NOBODY makes a chip for a 1981 computer controlled Camaro, if you get my drift.
That's because there would be no need for one.
Okay, the computer-controlled distributor is crap - advance curve sucks, ditch it.
But, the carb is perfect for the street! All it does is adjust the main metering rods to keep ideal A/F ratio at part throttle/cruise, so you'll get really good economy. As soon as you floor it, the primaries go full rich (just like a mech Q-jet would do).
The only things you need for this are the O2 sensor, and MAP (manifold air pressure) sensor. The O2 so the computer knows what the A/F ratio is, and the MAP so it knows when you floor it. As long as there's decent vacuum the computer does fine from what the 3G guys say.
Oh, and the secondaries work just like normal.
Basically, there's nothing on the carb end that a chip would be able to improve - it already does exactly what you'd want it to do!
Old Oct 10, 2003 | 03:20 PM
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However, I haven't seen anyone here in Orlando run a 13.1 with only a 101mph trap speed
Todd, I ran 12.98 @ 101 and in cool weather I went 12.71 @ 103. That was with my old motor in my 81 Z. Car had a 1.72 60 ft. I am in Gainesville,FL. If you drop from 2.3 to 1.9 60ft you should be .8 quicker in the 1/4.
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