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Somebody Please help

Old 10-24-2003, 10:34 PM
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Default Somebody Please help

Alright The setup is a Twin Turbo D16z6 (2 Rhb52's) VAFC v2. DSM 450cc injectors, 255LPH pump. Timing is retarded as far as it goes. I have the vafc set at -25 and I'm getting a 14.3 AFR. The gauge isn't wrong becuase we took out the plugs and they're white. Compared to everybody else's settings I should be swimming in fuel. What the hell could it be?

This is also UNDER 4 pounds of boost
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Old 10-24-2003, 11:20 PM
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Default Re:Somebody Please help

i was posting on this earlier today about the Correlation of VE to turbine housing efficeny. Bascially your engine breathes extremly well out of the turbine housing. so it has a ALOT of VE before boost. so what your gonna have to do is Run it at like -10-15% - on the vafc maybe almost no negative. . also for the timming. well you can get creative there. lengthen the adjusting slots. i think if you get the AFR down to like 12.8 or so it should be ok provided timing is reasonable and you dont get into rediculous boost. also with the increased breathing Efficency out of the exhuast side of the head the motor wont be so easy to knock .redudced pre combustion temps thanks to improved scavenging ! ! good idea let me know what the spool up and that setup is like im curious to here about it!!

Please note these 2 things for me

RPM at which teh turbo begines to spool
Time it take from the boost threshold to arrive at full boost. itll help with a study im doing on turbine housings vs engine displacemnt !! thanx a bunch
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Old 10-25-2003, 04:09 PM
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Default Re:Somebody Please help

Why do you have the timing so far retarded? Is that the only way it would work?
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Old 10-26-2003, 01:04 AM
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Default Re:Somebody Please help

Thanks for the info. I was just making sure that I didn't have something fucked up in my setup itself. The timing is so far retarded becuase I have a crane cam ignition with an adjustable retard and I just put it all the way it can go for tuning. I figured I can gradually advance it when its running good
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