Re: 1/4 mile results

["Lauri Pettai" <lauri.pettai@netexpress.ee>]

What have you done to your car to get it to run so good?
Have you dynoed it?

I was only able to squeese 16.13s out of my stock 1.8 16v
with only Jamex airbox and Supersprint exhaust + some airplane
fuel mixture! :) I dynoed it only 98kW/134Hp (stock should be
102kW/139Hp). I know the engine is in bad shape.

Tell how many gears you use? I use only first three as the third
gear hits the rev limiter after the 400m has passed. I'm using street
tires 195/50/15" Hankook Ventus. (Slicks are not allowed!)

I'm using Bosch K-Jetronic fully mechanical injection so there's no
full throttle swiches and the day when I did those runs was quite
cold.

Lauri!

----- Original Message -----
From: "the mad bastard" <the-mad-bastard@home.com>
To: <scirocco-l@scirocco.org>; "Brad Sheridan" <brads@mindspring.com>
Sent: Tuesday, August 15, 2000 2:30 PM
Subject: Re: 1/4 mile results


> > Have you done some sort of runs with this to see if it is faster with
the
> > switch disconnected? It is there for a good reason from the factory.
With
> > less than full throttle, the mixture should alternate between lean and
> > rich, and it uses the O2 sensor as feedback to know how to do this. At
> full
> > throttle, it should go to richer than stoichiometric, which is what you
> > need for maximum power. And the O2 sensor is useless when it is trying
to
> > go richer than stoichiometric, which is why the O2 sensor is ignored for
> > full throttle. At least this is the theory for how the ECU should work.
>
>     indeed, we used the full throttle switch for the first 6 runs, but the
> temp wasn't changing any, so that's when we disconnected it.  i was
running
> consistent 14.85s, and a best of 14.5 with the full throttle switch in
> operation when ambient temperatures cooled down a bit.
>
>     i can tell you that as soon as the switch was turned off, temps
outside
> stayed quite hot, and i yanked a 14.33.  i'm sure that there were other
> fctors involved, but one thing is for sure, it didn't take away from my
> performance.
>
> >   What you are doing should make the mixture leaner than what is needed
> for
> > maximum power. Which is why I am curious if you have found different
> > results in reality with this setup.
>
>     the theory that my friend had is that the car was running so rich in
> open loop, so he wanted to see if he was correct.  he was correct.  the
> temps were really very high, and i'm sure that the track is kinda high, so
> the volume of air being jammed into the motor was a helluva lot less than
if
> it were cooler outside.  so, by turning off the full throttle switch, the
O2
> sensor was allowed to affect the mixture right up to 7000rpm.
>
>     at least this is what i think was happening.
>
> jason
> the mad bastard
>
>
> --
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