Fw: Min. air / minTPS / Holes in Butterflies.

[Bruce Plecan]

There are times when reguardless what ya do things don't guite line up.
Say you have a cammed TPI, and it needs more air at idle.
You you reset the min idle air, and then  maybe have a prob getting a nice
WOT   TPSv.
If you like low IAC counts at idle them the situation is all the more
aggravated.
But, there is a solution,
Bear with me while I share a posting from another list about what I did

> First off, your results will vary.  Ain't two engines exactly the same,
> least of all one matching mine.  Now with that said:
>
> I'd already been thru all the IAC reset prodecures, and checking for cable
> travel etc..  I had what was one of the last new TBs.   I have enough time
> burning chips that I tinker with IAC counts and such (ie lots of chips for
> numerous ecm types).
>
> I wasn't happy with the best adjustments I could get, I even had to grind
on
> the throttle stop to get *full travel*, and with that .42v @ idle and 4.1v
@
> WOT was the absolute best I could get.  That was with yanking the sound
> deadning stuff out from behind the carpeting etc..
>
> SO:
> Today I yanked the TB off.
> As, it was removed there were two full turns of butterfly opening from the
> closed posistion.
> So, I drilled a 1/16" in the butterfly.
> Then in R+Ring the TB numerous times and redrilling the hole larger
finally
> got to where the Butterfly was about seated, and a min IAC count.
> The **new** closed throttle posistion netted a idle TPS of .26v
> So in readjusting that to .42v, my new
> WOT  TPS  voltage is 4.5......
> My final set of holes were 2,   one eight inches.
> Being a brass butterfly, if you attempt this and go too far all it takes
is
> a good soldering iron and you can close em back up and start again.  No if
> done properly the solder won't fall out, I've done this on Webers for
years,
> and on AL butterflies JB Weld will work also, when using epoxies I oven
cure
> them to help heat shrink them in place.
>    If you don't have a high degree of confidence in what your doing, don't
> do this.
> Kinda of an advanced tuning thing.
> Bruce
>    Just Sharing what WORKS for me........
>          87 Black Car with some enhancements
>               (Translator +, amongst other items)


----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org