Quote:
Originally Posted by RHINO
hey on another note, i am planning on a tach at some point. what is the best place for a pick-up? just a generic flywheel one or is there something else made for the isuzu engine?
also, as ive been driving it for a while now i still sometimes forget to shift low enough and think i can rev up more, but the governer kicks in and reminds me. its a much lower revving engine than the numbers on paper would have you think, i'm glad i went with the overdrive tranny. i remember when looking at these engines in the early days of my swap options i was thinking that since i cruise at 2500rpm on the highway i might be ok with my four speed, glad i didnt, just going by ear i would say i MIGHT hit 2500 rpm when the governer kicks in but i think its even lower.
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On my truck I'm using the alternator to supply the tacho pulse. It's output is a 7V ripple. The tacho in my truck runs on DC (someone converted it at some stage) so I made a little frequency converter circuit. It's quite simple, involved a single chip and about half a dozen components following the chip makers circuit design. The output is tunable, I still haven't got it completely right but it's within about 100rpm.
My engine is governed to 3600rpm, but it's definitely most comfortable running below 2500. I used to have it geared for 2500rpm at 100km, but recently geared it up to 2000rpm at 100km and saved 15% in fuel.
I was hoping for such an improvement (the BSFC curve said it might happen), but was ecstatic to actually acheive it.