Goran,
Your remarks are insightful as always. the 456 cam was out by 0.5MM. the 123 was spot on.
We only have 2 hose clamps, on the intake to the IC. They are tight. The intercooler exhaust side to the intake manifold uses Mark Hargett's QDC. They are supposed to be good to 100 psi. We dont have a smoke machine handy to check.
You are also right that the TDC mark on the crank was wrong...8 degrees retarded.
The spark map I have now is all over the page. I am up for putting in time to develop it but would be very glad for some guidance on starting points...for guys running 10-15lbs boost, where are you setting idle timing, when do you start ramoing up timing, and where/what is your max advance?
My map now starts at about 12 degrees at idle and progresses to 22 degrees. However it has lots of funny points like 36 degrees at high rpm/low load. And 10 degrees at high rpm and 220 kpa.
A cut/past graphical image of someone's map would be very highly appreciated!
Thanks again Goran, Tim, Mike, Jonathan and everyone!
Quote:
Originally Posted by JohnJL
Well, mixed success.
Last Wednesday had some successes and failures.
We spent a few more hours cleaning things up and getting idle set up, and then went over to the dyno for a few hours, finally finishing up at 11:30 PM.
The motor ran well, transmission did its bit and everything held together, which was obviously relieving.
However power was way down from where I expected. Here's a link to the 930/Supercharged forum where I describe the symptoms...
Since found at least 3 issues...
1. Cam timing on one side was slightly out. I was hoping to find the cams out more as this would expain the issues we were having but it looks like the 456 bank was out ~0.5mm. The 123 bank was bang on 2.4mm.
2. The TDC mark on the crank pulley was 8 degrees retarded. THis is a issue however doesnt explain the loss of boost.
3. THe idle correction settings were way off.
She now starts fine but idles with a lot of hunt and is a beast to get up/off the trailer and into the garage.
The ignition map looks crazy, I need some help here. My plan is to install the new harness over the next 2 weeks and neaten everything up. The tuner gets back from holiday then and I'd like to get right over to the dyno then. In the meantime I'd like to clean up the ignition map and would appreciate some help from others running 10-15 lbs boost. What is your idle timing, how early do you ramp up and at what advance do you top out?
your help appreciated...
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