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Compression Test today 100/120/117/118

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Old May 19, 2010 | 05:34 AM
  #46  
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From: SATown
Originally Posted by Wht03evo8
Ok, i finally got ecuflash working on my Mac, so which numbers do i need to be looking at i am a Complete NEWB when it comes to tuning a car and being able to read these numbers. So anything you want to know i will tell ya. Air Fuel looks like it was 14.7
Not throughout the entire powerband right?! You'd have way more than 7 counts of knock with a 14.7:1 AFR on 91 octane.
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Old May 19, 2010 | 05:45 AM
  #47  
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You'll need to read the stickies in the EcuFlash section if you haven't already done so before you start messing around with your map. This is a good place to start :

https://www.evolutionm.net/forums/ec...-tune-evo.html
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Old May 19, 2010 | 08:06 AM
  #48  
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From: Boston
Originally Posted by Enzo1089
Ugh

So what are the major draw backs of having low compression, besides needing a motor overhaul...

I'm trying to stay positive and think that having my compression messed up is robbing my power so the car will be faster when its fixed This is correct right?
car will be faster. How does the car run now ( with these compression numbers ?)
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Old May 19, 2010 | 09:11 AM
  #49  
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From: Somewhere safe with my liver and kidney...
Originally Posted by Bignel00
car will be faster. How does the car run now ( with these compression numbers ?)
The odd thing is, it runs great. I beat Vipers and GT500's at the drags and I'm still on the stock 8 turbo with 91 octane.
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Old May 19, 2010 | 01:48 PM
  #50  
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From: Mitchigan
you are drag racing and you are knocking to crap...a responsible owner would park the car and take it to gst and get it tuned by brian..done

don't drag race the car, I wouldn't even drive the car if I had 7 counts of knock and didn't know my afr
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Old May 19, 2010 | 02:41 PM
  #51  
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LOL, he is not the one with the F***ed up counts of knock! that would be ME and the car just sits in the garage waiting to be touched.!

The AFR at 1000RPM to 5500RPM at 80% load is at 14.7!

There is NO way that i am gonna attempt to mess around with the map I am not gonna risk blowing the motor just the hell of it. I am trying to get some type of solution to the issue prior to going to GST.. i dont want to drive 1.5 hours to get told "I am sorry i cant Tune your car cuz of ......"
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Old May 19, 2010 | 03:50 PM
  #52  
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It's normal for the car to be at or around 14.7 AFR when out of boost/at low load. By 80% load do you mean actual load or TPS? If it's load then I think it should be at least a bit richer than that over 4-5 grand, but I'm just guessing here, don't take my word for it.

EDIT: Also, are you looking at AFRMAP in your log file, or the real AFR from a wideband?
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Old May 19, 2010 | 04:33 PM
  #53  
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I am looking at the Log, i do not have my wideband installed yet
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Old May 19, 2010 | 04:43 PM
  #54  
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From: 41° 59' N, 87° 54' W
Originally Posted by Raptord
It's normal for the car to be at or around 14.7 AFR when out of boost/at low load. By 80% load do you mean actual load or TPS? If it's load then I think it should be at least a bit richer than that over 4-5 grand, but I'm just guessing here, don't take my word for it.

EDIT: Also, are you looking at AFRMAP in your log file, or the real AFR from a wideband?
At 80% TPS it better be at significantly less than 14.7 AFR when the turbo begins spooling up.

Wht03evo8, take your time. Read some of the how-to posts in the ECU flash forum ... as a matter of fact read them once, then read them again until you can almost recite them in your sleep. If you're going to attempt to tune your car, it's well worth the extra caution and time. If you haven't already done so, also invest in a wideband and make sure it's installed and calibrated correct. Once you get into it, you'll probably find that tuning isn't all that hard, but it is time-consuming.

l8r)
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Old May 19, 2010 | 04:50 PM
  #55  
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I have an AEM wideband already i just have to get installed, and to be really honest with you and everyone i have no interest in tuning my own car.
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Old May 19, 2010 | 04:51 PM
  #56  
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i heard that as long as the compressions are all close to each other you are fine
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Old May 19, 2010 | 06:25 PM
  #57  
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From: Gatineau, Quebec, Canada
Originally Posted by Wht03evo8
I am looking at the Log, i do not have my wideband installed yet
If your wideband isn't installed then where did you get 14.7 from? AFR MAP?
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