Partial success

[Bruce Plecan]

> Hooray, I've finally got my Fiat 850 sport running on fuel injection,

A S/C 850 that's Kewl

> however I'm now in need of some suggestions for the next part.  I have a
> Toyota MR2 s/c connected in a blow through configuration with the throttle
> body (it should be geared for 120kPa full boost, 17psi), my problem as it
> stands:
> At idle the ecu reads a vacuum (-21kPa to be exact) while the s/c side is
> seeing 90kPa (throttle blade shut).  At higher revs (no load) the boost
> will build up even more (over 250kPa) as the throttle is only just
opening.
> Obviously if I keep going like this the s/c is likely to blow a seal
> somewhere.
> Now here's my question, do I just fit a blow off valve and let it bleed of
> any excess boost above say 140kPa ?
> And what sort of blow off valve would I use, the ones I have seen on turbo
> cars are very small and the s/c has like a 62mm outlet, so that is a lot
of
> air to remove ?
> I have looked at a few available blow off valves (greddy, hks, etc), but
> they are all specced as turbo applications, isn't there anything for s/c
> applications ?

Can't you change the blower speed?.
That would be by far first best design
BOV are generally for over boost as in shifting rather then boost
management.  Gotta lot of room for error doing it mechanically, especially
on such a small motor, IMO
Bruce
>
> I'd appreciate any light people can shed on this unknown area I've
ventured
> into.
>
> Dan  dzorde at erggroup.com
>
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