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Old Apr 5, 2007 | 07:00 PM
  #16  
Copenhagen's Avatar
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From: Ft. Worth
Originally Posted by Titanium
From what nj is saying whether your shifting at 6500 or 7000 you have an issue that needs to be resolved. this is like asking if you should give up smoking when you need your leg sewed back on.

From the way the log is reading, your modis operendi (oh whatever) should go like this:

1. Get a WBo2.
2. Lean Out to reduce IDC.
3. Get a Walbro and Retune to further reduce IDC.

But no matter what, you should take it easy on the car right now.
Ok there is no knock I believe until around 6800rpms. If I am shifting at 6500rpms I won't be hitting the rpms in which the major knock is occuring, correct? I understand I am right on the edge and have since turned the boost down to stock, but what danger is there if I am getting no major knock before I shift?
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Old Apr 5, 2007 | 07:02 PM
  #17  
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From: Somewhere
on stock fuel pump, the ECU compensates the limitation of flow by increasing the duty cycle of the injectors.. so yes it's possible to be still lean and running out of duty cycle .. in this case, even if you can modify the fuel map, you can no longer increase any fuel safely as the IDC is already at the limits (ie full open)

IDC is ultimately a computation of values between rpm and injector timing .. so it is possible to exceed the 100% if the injector timing duration is long enough (very clear sign of injector being overworked)
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Old Apr 5, 2007 | 08:16 PM
  #18  
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We are trying to help you, but you keep asking the same question about shifting @ 6500 rpm. It is not a relevant question. In THIS log you did not knock below 6500 rpm, but what about in later WOT shifts @ 6500 rpm??? There is no guarantee that you will not knock later on.

You need the following to run this car safely:

1. WBO2 meter. This is a MUST on a turbo car. If you want to know what if your running lean or rich there is no botter way than a wideband.

2. You need a Walbro 255 pump. Again this is a must. It is a safety item for your EVO. $100 is not much to pay for consistent fuel supply and peace of mind.

In the meantime, pull the timing by 2* like I told you and DO NOT do WOT runs until you install a fuel pump.
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Old Apr 5, 2007 | 08:57 PM
  #19  
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From: ¯\(º_o)/¯
Originally Posted by Copenhagen
Ok there is no knock I believe until around 6800rpms. If I am shifting at 6500rpms I won't be hitting the rpms in which the major knock is occuring, correct? I understand I am right on the edge and have since turned the boost down to stock, but what danger is there if I am getting no major knock before I shift?
ITs a matter of having a good tune....not a half *** one where its great at one point but bad somewhere else.
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Old Apr 5, 2007 | 09:59 PM
  #20  
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From: sc
Bottom line: evo 8 and evo 9 both with walbro's, at same boost and A:F the 9 will have higher IDC simply because it breaths and farts more. The FPR system and injectors are the same part #'s, right?


Restate: Get a walbro, and if you wish to tune yourself - get a WB
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Old Apr 5, 2007 | 10:25 PM
  #21  
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From: Ft. Worth
I didn't realize how much I was really maxing out the stock pump. The boost has already been dropped back down to 19lbs. The ecuflash is very confusing, on the high octane timing map it has the rpm on the left and load % on the top. What values and how much should the values be decreased to equal 2* of timing?
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Old Apr 5, 2007 | 10:37 PM
  #22  
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From: 41° 59' N, 87° 54' W
Stock fuel pumps on the VIII are a known issue even for mildly modded cars. NJ is giving you good advice. I would take it asap.

The high octane timing map should be relatively self-explanatory. If it is not, then something is either off in your XML definition file, or you need to ... RTFF ... err, you may want to read up more on ECUflash before making any more changes. ;-)

l8r)
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Old Apr 5, 2007 | 10:48 PM
  #23  
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From: Ft. Worth
Originally Posted by Ludikraut
Stock fuel pumps on the VIII are a known issue even for mildly modded cars. NJ is giving you good advice. I would take it asap.

The high octane timing map should be relatively self-explanatory. If it is not, then something is either off in your XML definition file, or you need to ... RTFF ... err, you may want to read up more on ECUflash before making any more changes. ;-)

l8r)
Wow I feel dumb, I found it. I was just looking at the top of the table and not the bottom.
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