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Old 03-20-2006, 05:54 PM   #1
Ceyvme
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06 Evo IX
Wicked White

Default Car seems slower after tune sinks in....

Im currently Cobb stage 2 with perrin uppipe, invidia downpipe, and turbo XS axleback.

When I first put the tune on the car seems perky and fast. Also after a battery reset. When the tune is about 50 miles in, the car seems to slow down quite a bit and seems sluggish to get in boost.


Now before you yell at me, I only reset the computer once to actually confirm it was doing this. Now that I know it is, what are some things to check? I dont have a mechanical boost guage as it broke a few miles back so what else can I check to ensure that my car isn't dieing?
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Old 03-20-2006, 06:22 PM   #2
nhluhr
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You can use your AP cable as an interface to your laptop computer and then use one of the logging programs (DeltaDash, StreetTuner, Tari, etc) to log some of the vitals. Good things to look at are:
-Knock Correction (during a pull)
-A/F Learning
-Boost (or Relative Pressure)
etc
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Old 03-20-2006, 06:25 PM   #3
jays05
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It sounds like you got too aggressive of a tune, and after a while the ECU is pulling timing. I had the same issue with my own self-tune for a while- the only way I could keep it knock-free was to run a 95+ octane mix. Otherwise it would feel great for a day or two, then start slowing down when the ECU pulled timing.

I guess you could try running a higher octane fuel mix to see if the problem is fuel/knock/tune related.
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Old 03-20-2006, 06:49 PM   #4
Ceyvme
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Alright, after my oregon trip I guess I am going to start filling up with 94 octane again. Thanks for the information guys.


Also nhluhr, where can I find more info on those programs if they are free utilities?
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Old 03-21-2006, 06:21 PM   #5
nhluhr
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Old 03-21-2006, 06:25 PM   #6
boundy3
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Your car is probably pulling timing like the others have said.

You can datalog for free by using ecuexplorer which you can get from www.tari.co.za

Just download that onto a laptop and you cand datalog with your accessport cable.

Check your IAM, a telltale sign about how much knock you are getting, 16=good--less than 12=bad basically. When you reset your ecu with the AP it should go to 12, see where it goes after about 30 miles of driving, don't do the "vishnu reset" since this will automatically bump it up to 16.

Also check what kind of ignition timing and KC values you are getting. Negative KC=bad.

good luck
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Old 03-22-2006, 12:54 AM   #7
xFactor
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There are other factors that are in play. Streetuner has a table titled "leared knock correction". Over time the ecu learns and applies a more general timing advance, or more likely retard, in this load vs. rpm map. For instance, right now with my car, I have an IAM of 16, yet my ecu has learned to pull 3 degrees of timing in the 5k -6k rpm and 1.7 -2.0 load (out of a current 2.14 max scaled load). I'm still seeing full advance on my sm-3, but the because learned kc map is one of the final corrections applied to the final timing number, my timing is still relatively low at 13 degrees when my base + advance adds up to 16. Yeah the car really feels flat compared to a fresh ecu reset. (I'm going to throw a little extra fuel at it, hoping to re-teach it; afr's in those sites are 11.4ish right now)

But I don't know if Tari reads the learned kc map; and there are probably even more maps still hidden away that impact timing that we don't know about...

later, x
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Old 03-22-2006, 01:34 AM   #8
nhluhr
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Quote:
Originally Posted by xFactor
But I don't know if Tari reads the learned kc map; and there are probably even more maps still hidden away that impact timing that we don't know about...

later, x
There are.

For instance, as soon as the Intake Air Temperature crests 122 degrees, the ECU starts pulling roughly a half degree of timing per degree of temperature rise over 122... so at 158 degrees intake temp, the ECU is pulling about 18 degrees of timing (note, it doesn't pull any more than 18...anything hotter than 158 and it just pulls the same amount).

Completely un-enclosed short-ram intakes = the devil
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