Re: RPM Limiter

["Barry P. Lewis" <barry@ctron.com>]

>> >Jeffrey Goggin said:
>> >When I had Techtonics Tuning build a Solo II motor for my '85 4000, they
>> >told me how to bypass the rev limiter; I'll see if I still have the note
>> >with their instructions around somewhere.
>> 
>> Bruce Bell said:
>> I'd like to see this as well. The only method I've heard of to bypass the
>> rev limiter on CIS-E involves hardwiring the fuel pump - not something I
>> care to do.
>> 
>
>Scott said:
>Now I'm just thinking out loud (a bad thing this early in the morning), and
>it occurs to me that somethings wrong here.  If the rev limiter (ie the
>computer) is cutting out the fuel pump at X rpm, then its interrupting
>the fuel pump's power supply.  However, unless the full load for the pump
>is going through the computer (not likely), then the computer must send
>its cutout signal to some other relay, which in turn cuts the pump's power.
>So, without seeing a wiring schematic, and barring this relay/computer signal
>path serves more than one purpose, wouldn't it be possible to just remove this
>signal/wire from the circuit.  Interrupt the signal and the pump keeps whirring
>away happily, as do you.  Again assuming this doesn't cause you to melt a
>piston etc.  It just seems that if you remove one wire/signal, as long as it
>has a single purpose, you should be "hard wiring" the pump per say.

I think things have gotten a little confused. My orginal question concerned
a 86' 4000Q. This of couse is a five cylinder. In 86 the fuel pump (on the 5's)
was not computer controlled. The fuel pump relay contains some electronic
circuitry to look for ignition pulses (a 555 chip for you EE types).
When too many pulses come in, the relay drops out. Also the relay won't close
if there are no pulses. This prevents it running when the ignition is on 
but the engine isn't running.

On my old 82 Rabbit, when at max RPM, the car would seem to run smooth but
just stop accelerating. On my Audi, the car shakes and skips at the limit.
Do other peoples five cylinders do this? Also, sometimes it seem to happen
a few hundred RPM short of the tach redline (unless my tach is slow and just
didn't get there yet).

Now, for you hackers, I suppose I could just change a resisitor value 
(or replace it with a pot) and set the limit higher.

Maybe I just need a new relay.....

Anyway, I said all that to ask... Is my car acting normally?

Thanks for listening,

Barry
86' 4000CS Quattro