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Old 05-21-2013   #479
Mark Leasure
 
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Join Date: Aug 2006
Location: eagan
Posts: 898
Re: Mark's 1G Winter Projects

Yeah it’s been a little while since my last update. The car would breakup at 4K RPM and 6K RPM super bad. I couldn’t even get a full pull in at the lowest boost level. The culprit was that I converted to that Kiggley 12 tooth crank trigger wheel and the cam sensor was not adjusted correctly. The signals were overlapping and the cam signal was very very close to a crank signal event. At 4K and 6K the signal would overlap causing ignition errors. I think it was due timing belt harmonics??

I also put back in my wideband in the down pipe, since I don’t fully trust the readings of the individual widebands yet. They are all off from one another by almost a full point of AFR! Also they seem to be a little nonlinear at idle. So to gain confidence in their readings I need to play around by swapping injectors around and seeing if AFR’s track to the change or remain the same and then do the same with the widebands themselves. Lots of BS to prove it out.

I also just added a 2G VSS sending unit, so I can control my 2-step on launch vs. gear to gear shifting. Both John and I have seen lazy recovery times when the 2step kicked in between our shifts at the track.

And to wrap it up I’m planning on bringing the car to BIR this weekend for its maiden voyage down the track! I'm going to be forced to enter it in King Street due to it being too light for Unlimited Street. Lots of changes this year, I'm crossing my fingers that don't have any major bugs to work out. I just want a good clean pass deep in the 9's or maybe even 8's who knows!
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