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Adam G

Cold Start & Crank Enrichment setup

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Hi all, I am just looking for some guideance on setting up the cold start and crank enrichment for an R33 Gtst with a GTSLink. I had it tuned a while ago, but every 3-4 months the plugs seem to get fouled and I am unable to start the car. I am not sure if this is a combination of either a) the fact that I only drive it on weekends and the battery gets a little drained during the week and means the spark isnt strong enough, B) the cold start and crank enrichment are too rich, c) it is running too rich on a whole. I am running 555cc injectors. There is also black exhaust marks on the ground behind where I park my car Is there a proper procedure to setting up the cold start & crank enrichment? Any other tips would be greatly appreciated Thanks Adam

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The only real way to do it is with nurmours cold starts and adjusting the numbers till the best result is achieved. It is likely to be mostly down to the crank enrichment.

Simon

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Thanks for you reply. I checked the settings Cold start is 12 Crank enrichment is 76 I understand smaller crank enrichment number equals more enrichment. What sort of adjustment would be sufficient? Is a single digit change going to be noticeable or more like 5 or 10 point change? I started it tonight after having not run it in 3 days and it is coldish tonight. It took a bit of cranking to get it going, was very rough and didnt want to rev. Thanks Adam

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Changes of about 2 units should be a good starting point. Crank will effect the first burst and then cold start will kick in once the motor has burst and is running.

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What about CRANK DECAY? My car used to start right up when I had higher compression (10:1 Subaru) Now I lowered the compression to 8.4:1 and cold starts take a bit more. I lowered the Crank Enrichment to 58, and my Crank Decay is at 12... Whats the purpose of Crank Decay then?

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17 hours ago, iliasfyntanidis said:

So lower crank enrichment gives more fuel or less? For example 30% crank enrichment gives more fuel than 40% crank enrichment? 

And what about crank enrichment table? Does lower numbers give more or less fuel? 

This thread is from 2007 and relates to a G1 ecu.  If your crank enrichment numbers are in percent then it sounds like you have a G4 or G4+.  The number relates to “percent increase”, So a bigger number will give more fuel.

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