well I found a place that could weigh the car today and
it was a bit more than I thought. balance is not bad,
there was 1/8th a tank of gas in the car and with me
in the car the front came in at
1720 lbs
and the rear was
1560
how much would a tank of gas weigh?
a full tank of gas would add what? 50 to 60 lbs?
that would put the rear up to 1620 or so,
so the front is only about 100 lbs heaver then the back,
remember that these weights are with me in the car
and with me adding 220lbs that puts the total
cars weight less me at about 3080 lbs.
now I am not sure what a stock 1988 TII tips the
scales at, I think i seen an add where they said that
the tested weight of a stock TII was 3050 which
puts me about 30 lbs over stock with the 20b in it!
I am almost sure that if i had used the stock TII
trani alone would have saved me that 30 lbs.
now to go play with the gtech

matt

 

WoW If the stock T2 is that heavy it have to be a convertable. But that thing will fly!! 20B all the way dude! so what have you found out with the GTECH 0-60 has got to be just short of killer!

 

correction -40lbs from the total ,,, forgot that I had a
case of antifreeze in the car...
didn't play with the gtech yet maybe tomorrow.
so the total is down to about 3000lbs now, there is
other junk in the car but nothing else that adds up to
any amount

matt

 

do you have ac and power steering? i've been driving mine for two weeks and the handling feels almost the same as it was with the 13bt

mike

 

no to a/c
yes to power steering.
handling feels not bad,, just love the way it pulls
when ya get your foot into it
about the balance between front and back it should
be really close with a full tank of gas since the 4 gal of
antifreeze added up to 40 lbs one could guess that
10 gal of gas in the tank might add about 100 lbs
making it really close to 50 - 50
matt

 

A stock S4 TII has a curb weight of about 2850 lbs. The stock FC didn't have an exact 50-50 weight distribution, and I personally like a bit more weight in the front to help compensate for my bad driving.

Gas weighs about 6 lbs per US gallon.

You can recompute your center of gravity using the forumula of Weight * Arm = Moment.

http://www.grc.nasa.gov/WWW/K-12/Win...of_forces.html

or for non-rocket scientists, hehehe...
http://www.rvtechnology.com/w_b_expounded.html

While the 20B isn't going to change the static weight distribution much, the polar moment of inertia is going to suffer, especially if you are like me and put a big radiator and FMIC up front, and a big fuel cell in the rear. Oh well.

 

I full tank is around 16 gallons.
A gallon of gasoline is about 6 pounds.
You're talking about 100lbs. there.


-Ted

 

had a chance to play with the gtech today just a little
though, was trying to figure out how to use is between
trying to keep the connection in the cig lighter plug
I found where to put the weight in and how to level it,
but it would seem that I have done something wrong,
I can only seem to get HP readings that I know are
kind of low. at 215hp,,, is the gtech not accurate or
is there something I am going wrong.
I know it is pulling as hard if not harder than the last
3rd gen that I had.
looking forward to testing it at 15psi boost, when I get
back from my vacation in 2 weeks..

matt

 

Tire slip will skew the results, and make sure that you take readings both up and down the same road so that you can average the results to help compensate for wind or road grade. No, it's not as accurate as a dyno or time slip, but it is still a good tool for general tuning.

 

Thats really off! about as accurate as a scud missile.

you got to have at least 270Hp (don't know what mods he has done) well that there puts it off my list of things to buy.

 

what is the driveline loss on the tranny? if we assume he's making 300hp (stock), and he's loosing 15-20% in the driveline you get 240-255, add in a bad launch and the fudge factor of the gtech and 215 may not be too far off. practice makes perfect =)

mike

 

mike , what you are saying is to launch as hard as
possible to make higher numbers.
As I see it dumping the clutch (manual trani) and putting
rotating mass into forward movement isn't really a good
reflection of HP, if this were so everyone would be
getting heaver flywheels lol
will play more tomorrow.
matt

 

we found that practice helps, we gteched evrything we could for a little while, even the parts trucks at work (17.8 1/4 mile)

mike

 

well I guess they arn't so bad. I might get one after all. But a dyno sounds like a better bet. Whats the prcess of putting the weight in. Whats you 0-60 time?

 

when we Gteched my firebird and the few mods I did we got almost 240rwhp averaged saw as high as 252. when it was put on a dyno i was back way down to 226rwhp. I would recomend using it and be consistant in your driving to aid in tuning and not to depend on the numbers being accurate.