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Should aircooled VW run richer air/fuel ratio
Camo - May 2nd, 2016 at 09:08 AM

Hi all,

Firstly, this is about high performance VW engines.

I recall someone saying or reading once that air cooled VW engines should be run slightly richer than other engines. From memory I think it was to aid slightly for heat issues in our engines, but I don't know.

So is there any truth to this and if you know either way for sure, please let me know.

Cheers, Kev

HappyDaze - May 2nd, 2016 at 12:23 PM

Kev, the main thing is the engine must not run too hot. If the temperature can be kept at a safe level, without dropping a lot of power, then err on the safe side and run a bit rich.

Do you have an air/fuel gauge fitted ?

vw54 - May 2nd, 2016 at 01:59 PM

slightly richer is good as per above to make it run cooler

Camo - May 2nd, 2016 at 05:31 PM

Thanks guys. I may be getting it dyno tuned this week with a guy that knows and uses my brand ECU (Megasuirt) but not sure if he knows about air cooled vw's :rolleyes:

Thought if I knew for sure I could say tune it and then add 2-3% across all tables, just as an example :?:

Greg - Laptop displays the ratio, but not sure if it is accurate until dyno and he sticks thing up exhaust pipe to compare.

Dave - Water injection will also cool it ;) And this may be a future mod :yes:

Cheers, Kev

HappyDaze - May 2nd, 2016 at 05:51 PM

Dyno AFR reading should be OK, but keep an eye on temps. Do you have a cylinder head temp. gauge ?

At 6000 RPM in 4th at Wakefield Park, No.8 Beetle showed 12.4 : 1 AFR on the gauge, and 350F on the CHT gauge, for what it's worth.

You need a big spark to run rich...hope yours is big enough ! I'm talking about spark, you fools. :smilegrin:

vw54 - May 2nd, 2016 at 08:14 PM

Water Injection tooooooo FKIN complicated

Use the KISS method for all things VW

Get a sensor up its bum and check the ratio pretty simple and cheaper than a dyno tune by a guy that DOES NOT no VWs
U will be 12 out of pocket

hellbugged - May 3rd, 2016 at 06:24 AM

Kev

Please talk to lee Harris first

His turbo injected beetle has been running sweet for years.

http://forums.aussieveedubbers.com/viewprofile.php?memberid=592 

Camo - May 3rd, 2016 at 07:27 AM

Quote:
Originally posted by hellbugged
Kev

Please talk to lee Harris first

His turbo injected beetle has been running sweet for years.





Good thinking 99, I have his number so will give him a call :tu:

Thanks, Kev

fish26 - May 3rd, 2016 at 09:09 PM

Will this be the first dyno tune since the engine build?