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Posted by Kevin K [Email] (#374) [Profile/Gallery] (more from Kevin K) on Tue, 20 Nov 2001 12:27:13 Share Post by Email
In Reply to: ChrisX-what was fuel pressure? Kevin why would, SteveY, Tue, 20 Nov 2001 09:29:40
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pump limiting would give same a/f curve above some critical hp level. The RRFPR run showed increase richness up to max boost (torque peak), then about same lean change at the end.

Duty cycle meas't would be very helpful, mabe even pulse width. I suspect the wot is from maps up to some amm ouput, per ecu, then pulse width is fixed above that. Mabe this is an inj'r drive problem, with laggy open events at higher rpms with high manifold pressures, and degrading the pulse width. Low impedence inj'rs are less likely to have these problems, but not sure of retro fit details.

The obvious simple fix is xtra inj'rs kicking in at 4400 rpm, with duty cycles increasing with rpm. the driver would be enabled at say 15 psi.

A some point, the LH should be trashed for a sds, haltech, etc. These things can drive the low imp inj's. The haltech even supports sequential injection (emissions friendly), vs LH pure batch. Most important, rpm power band can be opened, so cams can keep torque up thru 6k rpm, and open up some more hp at same or lower boost.

Mabe time for an update from the SDS guys.




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