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MazdaSpeed 3/6 - Fuel, Nitrous & Water Injection MazdaSpeed 3/6 - Fuel, Nitrous & Water Injection Have a CDFP fuel pump question? Do you want to add Nitrous or Water Injection to your Mazdaspeed 3/6 ? Please come on in!


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 Old 10-26-2015, 10:14 PM   #1
 
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Default Erratic Hpfp Psi during Pull

Ive been starting to tinker with my Cobb Pulling some logs for Maf Cali and Looked at my HPFP PSI and it varies wildly, My Afr's don't seem to be too effected by it.

Is this a Normal Looking output? or should i be hunting for something wrong. Log is attached

the car is a 07 Speed6 131,000 kms with a Corksport short ram and turbo inlet

Thanks guys
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 Old 10-26-2015, 10:26 PM   #2
 
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you should look into what means what on a log.
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 Old 10-26-2015, 10:35 PM   #3
 
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I'm Looking at HPFP Act. Press

using the Virtual Dyno Datalogger
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 Old 10-26-2015, 10:39 PM   #4
 
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yeah, i know...

Originally Posted by phillyb hates me! View Post
you should look into what means what on a log.
op needs to look into what MEANS what on a log.
in other words, op.
you need to learn the rest of the values on your log.
when your pedal is at 99%, what's your fuel pressure doing?
when your afr is over 14 (why 14? look it up), what's your fuel pressure doing?
what's your pedal doing?

Last edited by phillyb hates me!; 10-26-2015 at 10:39 PM. Reason: MSF Database - Automerged Doublepost
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 Old 10-26-2015, 10:48 PM   #5
 
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I understand what does what I've tuned Haltechs megasquirts and Hondata I'm not familiar with Direct injection Fuel pressures and How they Should look.

Fuel pressure swinging like this does not look normal to me. This was During A Wot Pull in 3rd gear, I can Add in the other parts I was logging.




Last edited by Cdnspeed6; 10-26-2015 at 10:48 PM. Reason: MSF Database - Automerged Doublepost
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 Old 10-26-2015, 11:08 PM   #6
 
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As long as it's over 1600psi at WOT you are fine. Fuel demands will increase when you start modding and cranking up the boost. That's when you need HPFP upgrade. The forum has plenty of information about almost anything already.
You need to figure out your knock issue.
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 Old 10-27-2015, 12:42 AM   #7
 
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Thanks Tegxsi, I'm going to get my Maf calibrated and go from there
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 Old 10-27-2015, 04:23 AM   #8
 
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Knock is most likely from early spool, and because OP is still running stock map values, that's why it is so slow to decay. Other than that, log looks ok for a stock car, MAF values seem to be a little off while cruising/idle.

Also, you don't want to start a log at 2k rpm, especially when you don't know what you are doing. There is a ton of information on this board, about fuel pressures and all, I highly suggest you do some reading, and a majority of the questions you might have, will be answered.
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 Old 10-27-2015, 05:02 AM   #9
 
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Thanks again, I started the log down low just to see where the tune was at the Maf values were out quite abit i've got it dialed in abit more now.

I have done quite abit of reading on the high pressure fuel system just to get more familiar with it I just found a 100psi swing Odd and figured i would ask.

it doesn't seem to afr too much and the ecu didnt try to adjust pulse width for it.
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