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914World.com _ 914World Garage _ Spark and Fuel Maps for a 2056

Posted by: DNHunt May 8 2005, 07:06 PM

I finally got around to tuning my old engine in the car. Here's the results of tuning on the street. This is a crankfire ignition. Here's an old pick of the VR sensor mounting.

Dave

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Posted by: DNHunt May 8 2005, 07:07 PM

Here's the timing Map

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Posted by: DNHunt May 8 2005, 07:10 PM

It was really fun checking the timing with the light and the computer. I read the timing advance and Rpms off of the computer and checked against the marks on the fan

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Posted by: DNHunt May 8 2005, 07:11 PM

The fuel Map

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Posted by: DNHunt May 8 2005, 07:12 PM

The 3d representation of the fuel Map.

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Posted by: dinomium May 9 2005, 12:15 PM

Kewl pix Dave...

Posted by: jkeyzer May 9 2005, 12:55 PM

Sort of off topic, but maybe I missed it, but what ended up being the problem with the motor last time you tore it down? How was it resolved?

Posted by: DNHunt May 9 2005, 01:48 PM

It appears there are several issues. Ultra rich during breakin causing oil dilution. Some clamping issues with a couple of the cylinders. Bad metal in the cam blank. We still don't have a final diagnosis. Parts are still out for repair or replacement. Both Jake and Charles have been great. To paraphase Jake. An engine's worst enemy is a fool with a 13mm wrench. Mind you he's never said that to me but the shoe fits.

Dave

Posted by: lapuwali May 9 2005, 02:06 PM

It's interesting you're running so much more advance at 600rpm than 1000rpm. What's the thinking there? Does it help with idle stability?

Posted by: DNHunt May 9 2005, 02:49 PM

The thought is to give it a little bump if it stumbles. I haven't needed it so I'll probably take the extra out.

Dave

Posted by: Mueller May 9 2005, 02:53 PM

QUOTE (DNHunt @ May 9 2005, 01:49 PM)
The thought is to give it a little bump if it stumbles. I haven't needed it so I'll probably take the extra out.

Dave

for cranking, is the advance set at 15° then???

wouldn't the car start easier at say 10° or less??

Posted by: DNHunt May 9 2005, 02:56 PM

Cranking is 10. The engine is never down at 600. Like I said I'll probably take it out.

Dave

Posted by: TimT May 9 2005, 02:59 PM

Having that extra advance between 600-100 helps if engine starts to stall/stumble.
It also helps if you have a lightened clutch or flywheel. The extra advance gives the engine more torque, and can help it overcome tendencies to stall.

Id leave the timing the way it is.. it will help if you have a rough idle, and the engine hunts.

Posted by: Mueller Jun 8 2005, 04:45 PM

Dave....any chance you know or can tell me what your injector duty cycle is at idle???

Mine right now is 3%.....I hope you don't mind too much, but I am using your values (tweaked somewhat ) for my initial settings on my FI.....

Posted by: crash914 Jun 9 2005, 06:24 AM

Mike, mine is around 5 to 7 ms. or is that duty cycle????

Posted by: DNHunt Jun 9 2005, 07:05 AM

Mike

With the 2.0l injectors pulsewidth is 1.7 with a 1.0 ms opening time. Duty cycle is 2.8

Good Luck

Dave