[Shotimes] Deceleration questions

[Ron Childs]

One thing you may consider, and I don't know why it would be different between two
SHOs is that the PCM keeps the idle up a bit when the car is moving. I think that
the VSS, where the speedo cable connects to the tranny, (MTX) tells the PCM not to
let the idle all the way down for emissions reasons if the car is moving. 

Just a suggestion as a possible connection.

-Ron Childs   '91


--- Jim and Debbie Leyden <jndleyden@mindspring.com> wrote:
> Silly question for all of you.
> My wife's red '93 had been slightly modified as you can see from my sig.  My
> white '93 is supposed to have been left stock according to the PO but I'm
> not really sure he is correct.  When I was first looking at it I had the PO
> take it to FPS and have Doug look it over.  After Doug's test drive he got
> out and took me aside and said "It's FAST!"  I asked if it was as fast as
> Debbie's and his answer was "I don't know, it might be!"
> One of the things that I have never liked about the motor in the red one is
> that it takes too long for the RPMs to drop between shifts.  I thought that
> the Fidanza would help cure that and it did to a degree.  I asked Doug if he
> could burn me a custom chip that would keep the IAB closed during decel.  He
> told me that the response time of the IAB wasn't quick enough to keep it
> closed and snap it back open before the engine would die coming down to
> idle.
> Okay, Here is the punch line...  On my '93 whiteout the idle snaps down just
> like I expected the red one to do after all the mods.  Not as fast as the
> Yoshimura Honda 750 I used to own (I know there is a lot more rotating mass
> in a SHO motor) but a lot faster than the red one does.  It doesn't die when
> it comes down to idle so I know that the IAB is working (or at least I
> assume it is, I haven't disconnected it to really see)  Now, I'm not sure if
> there is a problem with the red one that is causing it to be lazy on decel
> or if there is something about the white one that makes it so much faster on
> decel.
> 
> Anyone have any clues for me?
> 
> Jim
> '93 MTX
> Ultra Crimson Red/Black Split, Konis, Eibachs, K&N, SFCs, Gutted PP Y Pipe,
> FPS '96 Front Brakes, Brembo Slotted Rotors, Solid Sub-Frame Bushings, TPR
> Suspension bushings, 24/26mm ASBs, Superchip, Ported and Polished Heads, FPS
> Valve Springs, Performance Tune, Reinforced Motor Mounts, Fidanza Flywheel
> w/Stock Clutch and P225/55 ZR16 Michelin Pilot Sport A/S's.
> '93 MTX
> Oxford Whiteout/Mocha Full, P225/55 ZR16 Michelin Pilot Sports A/S's
> 
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