RE: SD> W.O.T. flat spot

[Jay Jochec]

If you think it's a fueling issue then don't bother trying to read the 
stock O2 sensor. They're junk for accurate fueling. My case example. I 
have a 87 ShelbyZ with a 2.5, SMEC, +40's blah blah blah. I was trying 
to get the voltage of the stock O2 to read higher than it was reading 
which was .82 via the OTC scanner even though the Narrow Band (NB) O2 
sensor gauge was showing 9 lights. So I starting upping the fuel curve 
at WOT. I added 10% and got it to read .88v. Ok add 10% more, no change, 
add another 10%, still no change. I then installed a wideband O2 kit. 
Guess what that extra 30% of fuel is actaully reading.... It pegged the 
wideband at over 9:1 a/f ratio! Even though the stock O2 wouldn't run 
over .88v and the NB gauge was still reading 9 lights. I ended up taking 
40% fuel out of the WOT table to get it to read 11.6-12.0:1 ratios. If 
you're gonna play around with the fuel and boost you need to have 
something more accurate than the stock O2. All it does is tell the ECU 
if it's on the rich or lean side of Stoich. Nothing more. I have an 
Innovate XD-16 setup. It has a nice gauge, the WB controller and sensor. 
It has two programmable outputs. One to do with what you want and the 
other I feed to the ECU to simulate the stock O2 guage's output. I even 
tweaked it so when the car is running in closed loop it looks for stoich 
at 16.3:1 instead of 14.7:1 but the ECU thinks it's at 14.7:1. As soon 
as the car hits boost I have the ECU tweaked to go into open loop and 
ignore the O2 completely. The MPG is impressive with the car, and the 
power is back although I haven't had a chance to get to the track to 
tell me what my butt is feeling.

Anyway don't trust the Stock O2 or it's readings. A basewideband kit is 
$179. Not too bad. And you can watch the virtual gauge on the laptop so 
you don't even need a guage to watch it. All of my turbo cars will be 
getting this. Heck with gas prices if I had an N/A car I'd put one on 
there too.


Later,

Jay Jochec

From: [EMAIL PROTECTED]
Subject: SD> W.O.T. flat spot

All,
I have a wide open throttle stall in 2nd or 3rd gear.
It will recover if I let off the gas slightly.
It also did it with a MP Stage 2 computer.
It just does not feel as strong as my stock CSX-T.

I've pieced this together from parts in boxes that came in the car.
87 CSX, stock block and computer
with MP head, slider cam. Not sure about lift.
3 inch,  no cat.
A.F.P. set  at 50psi and I think it's got 20% injectors.
12-14 vacuum, boosts to 10 just fine.
I've checked and double checked vacuum lines.
My guess is I have to drop the fuel pressure somewhat.

The OTC diag/code box I have will not read the O2 sensor
with it's current software. I'm connection to the cable on the right
front by the MAP. I have not connected a volt meter or gauge to
the O2 wire yet.

Q#1 Any Ideas or suggestions, things to look at before I dig into  it again?

Q#2 What type of diag/code box will read 87 electronics?

Thanks in advance.
Steve Kalmes

--

--
"....if you got turbo lag, you haven't installed a Gus Valve!!!"
    Jay Jochec

http://www.turbomopar.com/oakley1/index.html
85' GLHT "GLHNSLH" The exact same one pictured in the Dec. 95' issue of 
Sport Compact Car
Formerly owned by Thomas Ernst
87' ShelbyZ "BEE-ACH" NEW RECORD! [EMAIL PROTECTED] Yoko AVS Intermediates 
to 32psi
for a 2.3 60ft, 13psi of boost. 3120lbs Race weight.

Spokane, Wa

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