Stoopalini

First off, I'd like to send a HUGE thanks to Jonas for putting this together. I built the cable with $9 worth of parts from Radio Shack, and it works great!

There are a couple of things I am concerned about, and was hoping you guys could help me out here.

Last night, I hooked up the laptop for a 20 min drive to a friends house. Along the way, the IAT reading was over 200'F; spiking around 270'F. IAT stands for Intake Air Temperature, right? If so, I can't believe that my intake temp is running that high, especially with 35'F temps outside. So, does this mean I have a bad IAT sensor? or is this an issue with WinALDL?

Secondly, upon arrival at my buddies house, I had 171 knocks counted. Looking at the spark table, most of the knocks are happening between 2000 - 2500 RPM and 50-60%MAP. I noticed most of the knocks happening while cruising in 5th, at 80mph, 2100rpm, with just enough throttle to keep the speed at 80mph.
I'm pretty sure this is false knock of some kind, but not sure where to start. I have a new knock sensor and was wondering if there is a way to desensitize it before I install it. I know the roller rockers and headers can cause false knock readings (read car specs in sig)

One more thing I'm noticing, is that my Rich Flag is almost always present in the Flag Data tab. Could the abnormal high IAT reading cause the ECM to richen the mixture up??

Thanks again to Jonas for hooking us up, this software is really allowing me to understand more of the TBI setup

Thomas.

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1992 RS Camaro - Red
305-TBI/5 Speed Manual- 3.08 geared rear
1.6 Roller Rockers / Open Air K&N Filter / TBI & injector Spacers / ADS Super Chip & custom burned Off-Road Only chip /
Headers - 3" Cat'Back - Flow Master - Adjustable Coni shocks & struts / 16" factory wheels

[This message has been edited by Stoopalini (edited November 28, 2001).]

JoBy

What version did you use?
Ver 1.02 has a new MAT calcualtion. Previos versions used the same calculation as coolant temp.

If you used an older version ...
200F translates to 48F with the new calculation.
270F translates to 24F with the new calculation.

I don't know about your knock or Rich Flag.



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Jonas Bylund

Stoopalini

I'm using ver. 1.02b with the added dialogue box to configure the .ini file. This is the only version I downloaded, so it can't be something left over from an older version.

I thought about the IAT being related to the coolant temp due to an earlier post I read, but the coolant temp never went above 190'F?

One more question for you: Is there a way to extend the RPM range beyond 3600rpm and 3200rpm? I played with the RPM min setting in the dialogue box, but it didn't seem to change anything.

Thanks,

Thomas.

JoBy

The reson that the RPM does not go higher is that it is the the area you can tune with the VE / spark tables in the chip.

Atr you using the 8746 ECM? I just checked and it uses the new temp conversion.
Check the RAW values. The range is 0-255. Do you have very high numbers there? You might have a bad sensor, but that should throw an error code.
I calculated that the raw value is in the range from 180 to 230, and that seems a bit high.

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Jonas Bylund

Stoopalini

My ECM is stock, and I have the config set for the 1228746 ECM.

Does the Knock Count field in the Sensor Data tab only register detected knocks below 3600 rpm, or does it represent knocks through the whole rpm range?

I'm asking because I want to know if I am getting any more detected knocks in the upper rpm range. This would be very helpfull in determining where my high knock count is coming from.

I'll check the raw data tonight and see what it is registering. The IAT sensor was relocated right next to the A/C Dryer by the previous owner. I'll double check the sensor also and see if anything looks funny.

Maybe the sensor is bad, but still within the limits of the ECM to not throw a code? I'm guessing here ..........

Thanks for all your help and info, I appreciate it!

Thomas.

92Camaro305TBI

Just wandering. I thought the LO3 was supposed to use 1227747 Config... ?

Nevermind I double checked... Sorry

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92 Camaro 305 TBI Automatic
https://www.thirdgen.org/rides/index...ew&rideid=6100

[This message has been edited by 92Camaro305TBI (edited November 28, 2001).]

JoBy

All knocks above 3600 is included in that row.

As I said (wrote?) earlier we designed the tables to match the tables in the calibration chip, but I see your point.

It could be a good idea to extend the RPM range both for O2 and Spark count for WOT tuning. Other tables are used for that, but the information could still be useful.

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Jonas Bylund

Stoopalini

The raw IAT data was reading just about 200; sometimes a little lower.

I suspected the IAT sensor, so I bought a new one. The reading went down a bit, but is still pretty high.

Here is a snap shot of the screen after the IAT was replaced:


Has anyone else had any problems with IAT readings?

Thomas.

[This message has been edited by Stoopalini (edited December 12, 2001).]

JoBy

The new version 1.03a is out now.

Read about it here:

https://www.thirdgen.org/messgboard/...ML/002368.html

The RPM range in the tables are extended to 6400 RPM now.

/ Jonas

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Jonas Bylund

Stoopalini

I downloaded 1.03a and the IAT readings are still pretty off.

Here is what I did to test it out:

Checked OHMs of the IAT and it was .75 Connected computer and ran WinALDL and it gave a reading of around 190'F.

I then took an ice cube, and placed it right on the IAT sensor's probe, and the WinALDL reading went up to 260'F.

I then held a lighter under the probe, and the WinALDL reading came down to 120'F.

I think something is either wrong with my ECM, or WinALDL is freaking out. Is there a way to verify my ECM part number? Maybe I have a 'freak car' that has an abnormal ECM??

Thomas.

JoBy

I don't think that there is anything wrong with your ECM.

This is the info I got for the 1227808:

MAT table for the 1227808 ECM:
MAT, 0=-40F, 50=27F, 100= 95F, 121=122F, 200=230F, 250=298F, 255=304F

Your previous post ( screen dump ) shows a raw value of 178 and 200.3F. That matches the MAT table I got for the 1227808 (between 121=122F and 200=230F). I found a differnt MAT calculation for the 1227170 ECM and that seemd to be correct for the 1228746 too so I changed that in the latest release (1.04a). The 1227808 still uses the table I got for it.



The program uses the pink conversion for 1227808 and the blue for 1228746.

Your 190'F reading would be 90'F.
Your 260'F reading would be 40'F. (ice)
Your 120'F reading would be 130'F. (lighter)

The blue curve makes much more sense, so that is probably the correct one to use for the 1227808 ECM too. I will change that and release ver 1.04b by tomorrow.

The only ECM I have is the 1226026, and I don't even have any ALDL info for that one yet. I am more or less blind when I develop this software for other ECM's, so I need some feedback to fix problems like this.



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Jonas Bylund

Stoopalini

Great! Looks like you definitely have it figured out. If you want me to do any other tests to give you feedback, let me know; I'm more than wiling.

Thanks for your development on this software, and like I said, just let me know if there is anything I can do to help.

Thomas.

JoBy

Ver 1.04b is released now.
* Buggfix 1228746 use the same IAT calculation as 1227808.

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Jonas Bylund