Garage Storage Organization and Garage Cabinets

puppet · **99% Throttle pulls harder than 100% WOT**

What would cause this action?
Foot to the floor ... engine pulls good. A bit loud (throaty) .. a bit choppy.
Back off pedal ... and I mean just a fraction and the difference is night and day ... smooth and real strong.

No codes.

**Timmay2** · 08-30-2006, 06:53 PM

my only logical explanation

WOT engine uses max fuel, ignores some sesnors. (o2 specifically)

not WOT it doesnt, and actually provides the best mixture..

maybe someone else can be more technical than me.

ACR Turtle · 08-30-2006, 06:59 PM

Sounds like it "may" be too rich. Or it could be too lean. Is it detonating?

puppet · 08-30-2006, 07:13 PM

I'm right on the edge of goodness. 20psi boost ... 2lbs less fuel or 1* more ignition and I'd be knockin'. This isn't like half throttle or even three quarter throttle ... just a slight easing up off the firewall type thing. Wierd.

It is rich in the idle tables ... stumbles a bit on tip in. Maybe at WOT the ECU is pig rich too? Even just a slight throttle position south of WOT brings in another fuel table/map? Hmmm ..

88jbody · 08-30-2006, 08:12 PM

put a bolt up through the floor and adjust it to where it pulls best then it still seems like you are flooring it. LOL

puppet · 08-30-2006, 09:11 PM

hehehe ... don't think I haven't thought about that ... heh.

Shel-Game · 08-30-2006, 09:57 PM

Well, at part throttle, the ECU is trying to get as close to 14.7 A/F as possible. If that's the A/F you think you want to run at 20psi boost, then by all means keep doing the part throttle dance.

12:1 A/F is safer for a turbo car under full boost.

14.7:1 @ 20psi boost makes cool ashtrays...

puppet · 10:09 PM

Rob ... is anything less than to the floor considered part throttle?
I'm not seeing 14.7:1 at a touch off WOT ... am I? ... at least my O2 readout says otherwise.

f3likx · 08-31-2006, 02:13 AM

My car does that too. Half throttle feels twice as fast as full throttle, and I will get full boost.

Pretty lean though.

Shel-Game · 08-31-2006, 07:56 AM

Quote:

Originally Posted by puppet

Rob ... is anything less than to the floor considered part throttle?
I'm not seeing 14.7:1 at a touch off WOT ... am I? ... at least my O2 readout says otherwise.

No, It's like 3.6v over min throttle volts. You can measure the output voltage with the throttle closed, add 3.6v, and that's where the computer thinks it's at WOT.

As long as your A/F is safe, you should be OK. You want to be 0.8v or more on a n A/F. That's about as accurate as you can get without a WB.

puppet · 08-31-2006, 10:45 AM

Quote:

Originally Posted by Shel-Game

No, It's like 3.6v over min throttle volts. You can measure the output voltage with the throttle closed, add 3.6v, and that's where the computer thinks it's at WOT.

As long as your A/F is safe, you should be OK. You want to be 0.8v or more on a n A/F. That's about as accurate as you can get without a WB.

I'm going to double check what I'm seeing today and check that sensor voltage as well. I'm just not clear on what would cause that big of a difference in such a small change in throttle angle position. I could understand this better if at full stop throttle the cal started reading another fuel/spark map. If not ... then I don't get it, unless it's a sensor glitch.

Shel-Game · 08-31-2006, 11:00 AM

Quote:

Originally Posted by puppet

I'm going to double check what I'm seeing today and check that sensor voltage as well. I'm just not clear on what would cause that big of a difference in such a small change in throttle angle position. I could understand this better if at full stop throttle the cal started reading another fuel/spark map. If not ... then I don't get it, unless it's a sensor glitch.

It DOES read different spark and fuel tables at WOT vs. part throttle. Part throttle tables are leaner and have more advance. That's whay it picks up power at slightly less than full throttle.

Plus, part throttle uses the O2 sensor for feedback and adjusts to try to get to 14.7 A/F. At WOT, it ignores the O2.

TheGinMill · 09-04-2006, 08:03 PM

Quote:

Originally Posted by puppet

not clear on what would cause that big of a difference in such a small change in throttle angle position.

I could understand this better if at full stop throttle the cal started reading another fuel/spark map.

My buddie almost killed my minivan engine on 95% throttle, granted, I am on a 90 SBEC, so it may be different, but it IS on a different set of tables. . . .So to speak. Man, I wan tto reply so badly, but cant really put what I want to tell ya into a comprehendable paragraph.

Basically, you go to WOT tables, ignoring certain sensors, at whatever it is below the changeover, you go back to adaptive fuel and timing curves. Now, on my mini, its so strong at WOT tables it was I assume less noticable that your situation, but I sure as hell noticed it, I was somewhat pissed at first, till I read the data, timing getting yanked, knocks galore, and speckled slug tops.

If you are a Dcal guy, run some data at 95% ans 100%. Re write your fuel and timing curves to closer resemble the 95% values. Lots of time and work, but O so worth it with the new found power and fuel econ to boot.

puppet · 09-04-2006, 09:17 PM

Thanks for the insight TheGinMill.

Brian Putman · 09-05-2006, 08:59 AM

Could a 3.5v diode be used to keep the computer from thinking it is @ wot? And then set things correctly from there. Or maybe have a cal set up with the wot throttle value changed to a voltage to high for the tps to achieve. Just throwing out some ideas.