Timmerman "Shrapnnel-Knobben" mod
tquattroguy at yahoo.com
Tue Oct 17 15:53:34 EDT 2000
I guess I didn't realize that Paul T sold the resistor mod.
Anyhow, I already have the Adjustable pressure regulator (just
a small unit from Sears for Air Compressor regulation) that I'm
using. Closed off I get about 8psi with my ur-q spring set in
the middle. Actually about 9psi now as pre tensioning it really
helps low RPM performance and spool up. If I turn the valve
about 3/4 turn then I'm at 14psi and occasionally will hear a
little bit of ping if the IC is heat soaked at all. Like if I
do 2 0-60 runs back to back or get on it for a 0-100 run then
around 100 in 5th it sometimes will start to ping.
But, I'm just running with the FPR cutoff wire bypassed on my
Un modifiable Mac-07. I plan to drop in a Mac-11 that I have.
So, how does this Mod work. Can I use any 470ohm resistor. ANd
where do I solder it in? Is it simple, any temp sensitive
components int here I need to heat sink to protect while
Lastly, this would advance the timing at lower RPM??? Does
anyone know how much. ANd does anyone know the timing maps for
the mac-11? Does SJM have this posted anywhere? Probably not.
How bout how the Mac-14 timing maps vary. I'm running 8.8:1
compression so maybe Mac-14 timing maps would be more
beneficial. I still eventually want SJM to modify an ECU for me
but I'd like to look into this resistor mod.
--- "Doyt W. Echelberger" <Doyt at nwonline.net> wrote:
> Paul Timmerman in California sold a kit that allowed you to
> insert a 470
> ohm resistor into the daughter board of your ECU, which fooled
> the ECU into
> thinking the boost was lower than it really was at any moment.
> This kept
> the fuel pump cut-out from operating. The other part of the
> kit was a
> manual pressure valve that allowed you to set the pressure in
> your WG upper
> chamber by turning a dial on the valve. You connected this
> valve in the
> vacuum line between the intake manifold and the upper chamber
> of the WG, in
> place of the WGFV. Then you hooked up a manual boost gauge
> and ran boost
> tests and readjustments of the valve until the boost gauge
> read what you
> wanted......in my case about 15 PSI above atmospheric during
> the wind-out
> of the engine. I could have set it higher and did a few
> times, but I
> wanted to stay on the safer side of the detonation risk. The
> kit Timmerman
> sold was so good that it scared me, and I even replaced the
> resistor with a
> 560 ohm to soften the result. Been happy for two years.
> Paul Timmerman was doing research for NASA out in California,
> in the area
> of fuel cells when he offered this kit. Earlier this year I
> heard he was
> more interested in a more complex and sophisticated systems
> for his stable
> of rally cars. He had 3 Audis and a NIssan then and was
> planning on pruning
> the herd.
> His email address was <ptimmerm at mashtun.jpl.nasa.gov>
> At 12:38 PM 10/17/00 -0400, you wrote:
> >which mod is this??
> > > Post Timmerman "Shrapnnel-Knobben" mod: Frighteningly
> fast, bordering on
> > > destructive/out-of-control. The true meaning of unintended
> > > Who has time to look at stop watches and speedometers?
> Very satisfying.
> > > More than I expected. No problems yet, after 2 years.
> > >
> > > Doyt Echelberger
> >Peter McConnel
> >'87 5kcstq 193k
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