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When we have set the cams up sensibly on the dyno Jim this wont be an issue.
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Ryan
Moderators: IMOC Moderators, IMOC Committee Members
jimGTS wrote:
Dam annoying, cause surely all these 1000hp supras and skylines still need to pass emissions and they'll have more mental fueling then me.
Ryan.g wrote:The O2 feedback is not on for a reason guys.With the lift and the way Jims cams are set so wild at 6 degrees advanced on the Intake and 6 degrees retarded on the exhaust, running anything leaner than 0.9 lambda and it misfires due to how long the combustion is with the way the cams are timed in and the fuel being burnt to quickly.
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Hence more fuel is needed to keep it stable.
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When we have set the cams up sensibly on the dyno Jim this wont be an issue.
Ryan
Kongaroo wrote:Ryan.g wrote:The O2 feedback is not on for a reason guys.With the lift and the way Jims cams are set so wild at 6 degrees advanced on the Intake and 6 degrees retarded on the exhaust, running anything leaner than 0.9 lambda and it misfires due to how long the combustion is with the way the cams are timed in and the fuel being burnt to quickly.
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Hence more fuel is needed to keep it stable.
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When we have set the cams up sensibly on the dyno Jim this wont be an issue.
Ryan
So does Jim have HKS 264's like in his profile or something more aggressive?
I have GSC 268 cams which are fairly comparable to the HKS 264 high lift cams(although the GSC's have slightly more lift).
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I currently have 3 degrees advance on my intake cam and exhaust is retarded 6 degrees as I read a recent test by ATS Racing that showed good results with this- so not too far from Jim's cam settings.
The car idles smoothly with pretty much no lope at this setting.
I have previously tried
'straight up' and also 4 degrees advanced intake and 4 degrees retarded exhaust
- both also without problems with misfire.
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I take it Jim's spark plugs, distributor cap and leads are all in good working order? If Jim's problems are typical of what to expect at 6 degrees advanced intake and 6 degrees retarded exhaust then I'll take that combination off the'to try' list, lol.
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In answer to JMR's query earlier- yes PFC can read voltages from the stock sensors including the O2 sensor.
When O2 feedback is active you will usually see this voltage going up and down constantly between 0 and 1.
When O2 feedback is off and assuming you have a stable idle/AFR in just one cell then the voltage reading will usually remain constant.
Btw Jim here's a good webpage regarding passing emissions in California- there's a number of things you can check on there if you are wanting to make some last minute checks before your MOT:
http://mr2.com/TEXT/SmogCheck.html
There's an interesting bit about using denatured alcohol in there- apparently this works well with cars that are failing due to being overly rich.
All I can say is I'm glad I have a pre-1995 car
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jimGTS wrote:friendly mot man last time around it seems before i got the car, lol
ryan wrote:jimGTS wrote:friendly mot man last time around it seems before i got the car, lol
LOL I suggest you pay'friendly MOT man' a visit and give him a bung
jimGTS wrote:the fact these guys opened the bonnet to try and find the dipstick means i dont trust any local garages round here to do any work, so i dont have any"friendly" garages.
just friendly mr2 tuners and affliates, lol.
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jimGTS wrote:surely you cant build up a friendly relationship with a place if you only go there once a year for an mot..
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if i knew someone who worked at one of these places, then of course that is different and you maybe could"get away" with more.
jimGTS wrote:surely you cant build up a friendly relationship with a place if you only go there once a year for an mot..
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