Timmerman "Shrapnnel-Knobben" mod
egav at wireless2000.com
Tue Oct 17 23:08:32 EDT 2000
Few corrections. Zener's value is 4.3V, it is soldered between pins 1 and 5
on the transducer (daughter) board and it clamps boost, as ECU reads it, at
about 1.35Bar. You can actually see 1.3-1.4 Bar on the in-dash gauge when
auxiliary boost gauge shows 1.8Bar. By the way, if anybody needs good
quality (made in Holland) glycerin filled 2.5" dia gauge graduated at
0 -1Bar and 0 -15psi, let me know. I found a store in Vancouver which sells
them for CDN$24 which would be about US$16. Pretty good price for good
'88 5KCDTQ 322K km (200K mi) , 1.8 Bar
'90 90 99K km (62K mi)
----- Original Message -----
From: "Jorgen Karlsson" <jurg at pp.sbbs.se>
To: "Todd Phenneger" <tquattroguy at yahoo.com>; "Doyt W. Echelberger"
<Doyt at nwonline.net>; "Peter McConnel" <peter at madriver.com>
Cc: <quattro at audifans.com>
Sent: October 17, 2000 6:16 PM
Subject: RE: Timmerman "Shrapnnel-Knobben" mod
> Todd Phenneger wrote:
> > 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
> > soldering in?
> It is a very simple mod, just take the time to remove the circuit board
> the case. I had to do it with only the cover of and it was a bit tight...
> I did the diode hack instead, I wasn't aware of the resistor mod then and
> am not really sure how it works yet. I was before this thread started but
> this thread only mentions one resistor... Well, nuff said.
> Diode hack:
> I have it pretty clear before my eyes here. The signal pin and the ground
> pin of the daughter board are the only ones affected. Unfortunally I don't
> know which one carries the signal. You will have to check that when you
> drive the car.
> IF YOU DON'T KNOW HOW TO IDENTIFY THESE PINS DON'T EVEN THINK OF DOING
> MOD! DON'T THINK OF DOING IT WITHOUT A GOOD AFTERMARKET BOOST GAUGE
> Sorry for yelling, but IS THAT CLEAR?
> Cut the signal pin, replace it with a 470ohm resistor, on the motherboard
> side of the resistor solder the 4.7v zener diode to the ground pin. The
> circle around the diode (if any) should be towards the resistor.
> This mod totally removes the fuel cut and thats all it does. It does not
> affect the ignition timing at low boost. The ecu will not see boost higher
> then 0.7-0.8 bar gauge pressure (not the dash display!!!).
> The resistor mod only has a suitable resistor instead of the diode, the
> lower resistance the higher the boost without fuel cut...
> Jorgen Karlsson
> Gothenburg, Sweden.
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