Hi@all,

refering to the following spec list on my 930, what ignition and and co settings would the experts recommend ?

- Tial WG
- Kokeln IC
- IA fuelhead
- K27
- GHL headers
- Scorpion exhaust

I asume that the original settings are not suitable for that kind of specs.

Cheers and thanks,
Stefan

 

You are missing other info for a good answer. Assuming everything else is stock, use stock settings - they work. From what you list, it looks like you have an upgraded stock system - and a good one needing no special tweaks.

For example, what is CR, what boost, and what ignition system? Have you done anything to the WUR to take advantage of the new fuel head mod?

 

Hi DonE,

- compression ratio: I used the head gaskets of the 930 3.3 factory tuned
(330 hp) version, but I don't know how much this lowers the factory standard
CR
- boost 1 bar
- ignition system: MSD coil, Magnecor lines, otherwise stock
- Nothing done to the WUR (what's that ?) to take advantage of the new fuel
head mod (I thought that there are no other mods needed ?)

Sorry for the silly asking above, some words are unknown for the german guy :-)).

Hope this helps to go a little more into detail.

Cheers and thnanks,
Stefan

 

Most of the time, the IA fuel head is all you need. If that isn't enough, *then* mess with the Warm Up Regulator. Per Stephen.

 

kein Problem

- CR - I can not comment to that either
- be careful with the 1 bar spring. For the most part, the motor can handle 1 bar, but using a spring in a system that depends on the exhaust circuit to be top notch (GHL isn't), you could see spikes and boost creep that will actually give you 1.1 or 1.2 bar for short intervals. Your biggest enemy here is heat and our air cooled engines have a tough time evacuating heat - above .7 bar, it builds FAST; then comes detonation; then comes melted pistons and broken rings.
- basically, the stock CDI was replaced by an MSD unit, but the distributor stayed the same, so no real change here
- WUR=warm up regulator. Did you get any specs from Imagine about the fuel head, for example how much more than stock does it flow? 5%? 9%? 14% etc. Chances are, you will NOT need to do anything more to the fueling system since you are mostly stock.

I would set everything to stock settings, and verify your air fuel ratio with a wideband O2 sensor on a dyno. Personally, I would install a .7 or .8 bar spring in the WG and go have fun.

 

So far, my Imagine Auto fuel head has been enough...haven't had to mess with the WUR. However, my car rarely sees past 5,500 RPMS and is not a track machine...just a daily driver.

 

IA head averages lower AFRs by about 1% -- YMMV.
Personally I'd go 24 degrees and 2.5% idle CO to start with.

Don's advice:
"I would set everything to stock settings, and verify your air fuel ratio with a wideband O2 sensor on a dyno. Personally, I would install a .7 or .8 bar spring in the WG and go have fun."

is good stuff to heed.

BE CAREFEUL

 

Hi guys,

thanks a lot for the good advice.
I will try and keep you updated.

Cheers
Stefan