Finally Got Diacom Working. Have a Few Q's (long)

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LuvBoost

New member
Rinda checked out my cable and it was fine. They sent it back along with a new software version and now I can link up. I made a few logs last night and saw a few things I need to ask about:

At half throttle, while accelerating, I have a surge. Boost goes up and down too. The log shows the ECM telling it to do that to the wastegate solenoid. I figured originally that it might be the WG rod adj. but if the ECM it telling the wastegate to go back and fourth can that still be the case? What else would cause it?

Also, the air intake temps were hitting 160+. Ambient was around 70. Does that sound normal? I though it was a bit high.

Integrater is all over the place. BLM is running between 124-128. It's been a while since I played with a Diacom and can't remember how these items should act.

O2's are running 960'ish at WOT. Ok??

No knock retard at all :D

Any suggestions or anything else I need to pay special attention to? If anyone needs to look at the logs I'll be glad to ship them off when I get home tonight. After I get everything straightened out I'm going with an Ultimate.
 
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smeagol

Active member
Those intake temps are too high for half throttle. Check your IC system - fluid levels - pump operation etc. Make some modifications if you haven't yet (heater hose, hot wired Jabsco, scoop, aux heat exchanger etc).

What version software did they send you?

The desired boost level changes with TPS reading in the stock cal, so that may be causing the wg dc to swing. High MAT readings aren't going to help that either (pressure/temperature are related).

BLM is fine. Integrator is going to move quite a bit, but it depends how much you are talking. 960mv is rich obviously, if this was in boost, that is probably fine.

I'd still check everything over for leaks to make sure all of the map readings are correct and that you aren't leaking boost or something.
 
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LuvBoost

New member
Thanks Brian. The intake temp reading was at WOT. I went all over the IC plumbing, changed the coolant and hot wired the pump a few weeks ago. On the boost level VS TPS, it's surging at steady state TPS. If I keep gradually applying throttle it won't do it. I'll look at the swing on the Integrator again tonight. I can't remember what the range was. I'll let ya know. Another thing I forgot to mention, I only see full boost during a WOT upshift. (while it's making the shift) It settles at 10-11lbs in between shifts.
 
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smeagol

Active member
Check for leaks I say.. do you have a radiator hose replacing the turbo to IC hose? Have you checked the IC to TB hose for leaks/tears? The wastegate may require adjustment too.

Check that version of Diacom as well..
 
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LuvBoost

New member
I'll let you know what version it is this evening. Yes, I'm using a rad hose. I put it on a few weeks ago. All the hoses look good. After today, I'm on vacation for a week :p . I'll have more time to play then. I plan on pulling the inner fender and checking the adj. on the WG too.
 
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LuvBoost

New member
Ok thanks, I took George's suggestion and looked at my logs in Datamaster. Much better. I also looked at a log that I missed from last night. It had a few surprises. 4 degrees KR at WOT, 999mv on the O2 and a 98.4% injector duty cycle. This was all happening at WOT right around 4K. So, I'm running rich and a high percentage on the IDC. Doesn't make sense. Boost peaked at 12 but for the most part hung out at 9-10. I'll check for leaks in the morning and do the rod adj.
 
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smeagol

Active member
Well considering that the computer won't make any fueling corrections for your WOT fueling conditions whatsoever, it doesn't have to make sense.

The only corrections that the computer can make for fueling at WOT is at the single open throttle BLM cell. If that value is below 128, it sets the value at 128 at WOT (during PE mode).
 
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LuvBoost

New member
That's right. I forgot about that. So at WOT I'm locked at 128 and if boost is lower than desired, it's rich. That makes sense now. I've been playing with FAST systems to long. No BLM to worry about there...
 
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smeagol

Active member
and if boost is lower than desired, it's rich.


That isn't a true statement in itself. The cal desires 14psi, and you have 10psi, doesn't mean you are getting fuel for 14psi. It fuels the truck for whatever MAP it is running. Just that the current state of tune, you are running a bit rich. The stock cal may run a bit rich at mid boost...it runs fairly rich at WOT anyways.
 
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LuvBoost

New member
I'm sure gld you're keeping me straightened out, Brian. I was under the impression at WOT all fueling was fixed except for changes in the MAT. I've got lots to learn! Thanks for the info. I'm heading to the garage. I'll let ya know what I find.
 
L

LuvBoost

New member
Just goes to show how long it's been since I played with it. It's about time they get into the 21st century and come up with a Windows product!
 
L

LuvBoost

New member
Ok, I think I got things the way they should be . :lol: The wastegate rod was way out of adj. After I took care of that my KR got worse. I dropped in a 160 stat and all seems well. I still see KR when I stomp it but it immediately drops away. IIRC that is normal. It runs around 14lbs steady till it shifts then it peaks during the shift at 16-17. Datamaster says it never goes over 15.4. Is that the limit the ECM can read because I'm running a 2 bar MAP? Brian, thanks for the help!!!
 
mrweelr

mrweelr

New member
I have a stock turbo, wastegate, and chip with 2-bar and Datamaster shows up to 18 psi when I get boost spikes. I also using the very latest version of DM. Hope that answers your question.
 
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smeagol

Active member
and chip with 2-bar and Datamaster shows up to 18 psi when I get boost spikes.


You answered your own question .. 2 bar map sensor, reading 18psi... not possible. Something is wrong, computer can only see 14.7psi with a 2 bar sensor. Either your config on Datamaster is wrong or the Datamaster scaling is wrong or you are reading it incorrectly (units).
 
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