Lets Talk Timing
08-05-2006, 02:03 PM
#21
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Join Date: Jun 2004
Posts: 524
Originally Posted by Lynn E. Hanover' post='656112' date='Jan 18 2005, 08:31 PM
The point is that there is no movement in sympathy to any harmonics in the engine. So long as anything like full throttle is never used at low revs, this change is fine for reducing the number of parts that can come adrift inside the distributor.
The idle advance will be way too early.
For a street car this change is not a good idea.
I would beg to disagree. Then again, I'm only running about 22 degrees of timing after finding no measurable gain from going higher, just reduced fuel economy.
The low-end torque increase is remarkable. Combine that with operational vacuum advance and you get an engine that is quite lively in the sub-2000rpm range and has excellent throttle response.
08-12-2006, 01:07 AM
#22
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Join Date: Apr 2003
Posts: 32
Originally Posted by j9fd3s' post='830543' date='Jul 29 2006, 03:31 PM
yah we tried it with the cosmo timing map, and its not pretty. on the cosmo map "load" wasnt labled in units, and its like henrik says, afm voltage+air temp, so i'm not sure it translates directly (linearly) into a map sensor value.
The biggest driver into the equation is the VE of the engine. If the VE was 1 then the "load" values would be almost directly proportional to the MAP reading. Anybody have a VE table for a stock setup? I'll be doing a bunch of datalogging on NAs in the not too distant future which should allow me to build a decent VE table.
-Henrik
08-12-2006, 10:39 AM
#23
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Join Date: May 2002
Location: California
Posts: 22,465
http://not2fast.wryday.com/turbo/glo...rbo_calc.shtml
you can guess.... bsfc is around .75@wot and afr is in the 11's*
gsl-se has 133 lbs ft @2700rpms and 135 hp @6500, i'm getting about 85% ve....
heres a dyno chart,
more info on the gsl-se, the s4, s5 and rx8 are just evolutions...
*havent widebanded one, unplugging the stock 02 affects things, they all will peg a narrowband though
you can guess.... bsfc is around .75@wot and afr is in the 11's*
gsl-se has 133 lbs ft @2700rpms and 135 hp @6500, i'm getting about 85% ve....
heres a dyno chart,
more info on the gsl-se, the s4, s5 and rx8 are just evolutions...
*havent widebanded one, unplugging the stock 02 affects things, they all will peg a narrowband though
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