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  #16 (permalink)  
Old 11-19-2012, 09:30 PM
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Personally I never run "shorty" headers- do what it takes to get it right.

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  #17 (permalink)  
Old 11-19-2012, 09:36 PM
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454 that sounds like a 10 second car
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Old 11-19-2012, 10:02 PM
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F birds "Y" pipe is interesting, reminds of the Tri Y headers I dyno'ed the Tri Ys! The increase in hp and torq was quite a bit more then street headers and fell just short of tuned competition headers till they entered higher rpms! over 5500rs! I guess that works on the same principle for scavenging!

I never ran shorty's either.

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Old 11-19-2012, 10:16 PM
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PJ, when were the tri Ys popular? I think Jere made the 4 into1s starting 1964? just before my time...lol.
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Old 11-19-2012, 10:59 PM
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Originally Posted by vinniekq2 View Post
PJ, when were the tri Ys popular? I think Jere made the 4 into1s starting 1964? just before my time...lol.
I saw the first in the early 60s, at Detroit drag way they called em 421s (4 into 2 into 1) I think they were made by Cheetah Or Black Jack! LOL

My dyno tests were in the the mid 80s! But they were really popular in the mid 70s and early 80s here! and are still produced! they were also used on a lot of Honda 750 racing motorcycles!

Jester
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Old 11-20-2012, 01:33 AM
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292

your 84 z will be happy without a little low end..
unless oh course you've reworked the whole car..
the facory set up.. a weak v6 with iroc wide tires can turn them over.lol

the car will be faster on the street with a softer lower end, that'll get you moving, roasting tires=fun but not fast
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Old 11-20-2012, 05:25 AM
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Quote:
Originally Posted by vinniekq2 View Post
454 that sounds like a 10 second car
runs mid 11's at 120. Being a manual shift and a weak t5, I shift the gears slow. however, runs mid 10's at 135 with I use the 150 to 200 no2 shot. 6.9 at 110 1/8 mile on n02. 71 240 zcar (datsun)
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Old 11-20-2012, 12:25 PM
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its very easy to get these cars to "hook".
Starting with the right tires. You can put all the torque to the ground
and leave your combo in the dust on acceleration.
You cannot make a car faster by killing off power. Like overcamming it.
The big top end will not be realized with the 292H with this exhaust system.

My car will yank the front wheels of the ground from a light in all street trim.
The way I run it at the track is the same as the street setup.
Its just that the track is the right place for that.

You want to put garbage tires with no traction on your car go ahead.
You will never make up the difference.

you do not want to or need to kill off low mid grunt.
You just need some basic traction.
this car weights almost 1000 lbs more than a 240Z w a SBC and 4 speed.
I had a 9's t/a (1988 3390 lb ) mid 10's (1980 turbo 400) , you have to rework the car to get any real traction out of that 3rd gen set up.

love to see a vid of it hanging tires on the street, on dot tires

so a 240z is 2200lb's?
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Old 11-20-2012, 02:45 PM
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2,355 lbs (American) Datsun 240 Z. F birds close enough!!

Jester
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Old 11-20-2012, 05:10 PM
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It would run
12.40's@111 in the third gen car (3530# wdriver)
Thats quick!

Jester
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  #26 (permalink)  
Old 11-22-2012, 08:11 AM
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a 240z is 2400lbs with fuel, I added another 200lbs with bigger stuff (engine, trans, exhaust, tires, radiator, diff, no2 system......) Plus I weigh in about 200lbs. So 2800lbs total car weight with driver. et is a little slow as compared to the trap speed due to slow shifts
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