2K2CamaroSS

iTrader: (18)

I found out on from a recent dyno that I'm running lean with my ported and polished MAF ends. Around 14.5:1 A/F ratio that varies through out the RPM range. In the higher RPM range is wear it's the leanest. I was wondering if there was an easy fix to this. Someone had mentioned something uping the fuel pressure by 1 psi.

Anyone have anyideas? I'm a newbie at this tuning stuff

FYI: Before the port and polished MAF ends I was running a constant 12.3:1 A/F

Brian

PS...I'm really loving the extra gas mileage though <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

<small>[ April 15, 2003, 09:37 AM: Message edited by: 2K2CamaroSS ]</small>

killer01ws6

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> In the higher RPM range is wear it's the leanest </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Careful those two combinations
can lead to a burned piston....

I would not pound on her or replace the stock ones till you get a good answer on getting more fuel to her... <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

2K2CamaroSS

iTrader: (18)

is 14.5:1 A/F really that dangerous

14.5 is the leanest it gets, which is at 6000 RPMS, the rest of the time it bounces from 14.1-14.3:1

Is that a safe A/F ratio? or Should I get this corrected ASAP...(I had the stock MAF ends ported and polished so I don't have any ones that I can revert to.)

killer01ws6

IMO yes that is to lean and could cause you problems I have read you want to be between
A/F -12.5:1 TO -12.8:1 at peak HP,

again I would baby her till you find out more for sure <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

killer01ws6

OK 2K2CamaroSS, I Would never want to give someone bad info, so I did some research,
The idea is to go as high as you can without knock. So, if you are 12.6(rich) and you would tweak the MAFT until you got 12.7, 12.8 and so on. With each run, you should have an increase in power the leaner you go. You would keep doing this until you detect knock and then back the MAFT down one notch. Typically, 12.8 is the best torque and 13.2 is the best HP
...

SO you want to make sure you are not getting any KR or pinging...

I hope this helps buddy. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

2K2CamaroSS

iTrader: (18)

Excellent info. Thanx

Now what's the difference between the MAFT versions?

killer01ws6

that is an other one of the devices to trick the pcm on what the a\f ratio is. You are not running one,(from your sig) and I think they are for adjusting more lean, so that would take you in the wrong direction

2K2CamaroSS

iTrader: (18)

hmmm..okay I'm confused...

the MAFT will only lean out the car and not richen??

2K2CamaroSS

iTrader: (18)

TTT

Will a MAFT help me or not?

MOBE

A MAFT will allow for adjusting rich or lean conditions. I have been wrestling with this issue myself. My a/f was 14.8 on my last dyno, so I bouhgt a MAF Translator. Are you getting any KR? I am/was getting 4 degrees.

On a side note... Can anyone tell me what the symptoms of a burnt piston are? Just curious.

Thanks!

2K2CamaroSS

iTrader: (18)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MOBE:
<strong> Are you getting any KR? I am/was getting 4 degrees.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I have no idea what KR is so I really couldn't tell ya <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

MOBE

KR= Knock Retard (detonation/pinging causes KR, which pulls timing)

You should autotap it to see what kind of KR you are getting. With a 14.5 a/f, you are surely getting some.

<small>[ April 16, 2003, 11:54 AM: Message edited by: MOBE ]</small>

jimmyblue

iTrader: (11)

Why not put the stock MAF ends back on and
see what these do for you? That's likely to
put you back to the normal tune, at least.
Otherwise you would want to increase fuel by
8-10% to get a proper WOT mixture. This is
within the MAFT's range but you have a zero-
cost option available to you....

killer01ws6

MOBE,
a miss, loss of pwr, high oil comsuption,
positve pressure in crank case, ie if you removed oil cap while running a lot of blow by or air.

usually would loose a valve before a forged piston though. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

2K2CamaroSS
What I ment is say if you car was normal and your referace was 0 you would have x amount adustment both ways, but in a bad + or - condition would limit adjustibity.
Sorry did not mean to confuse ya, I did not state that well. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

2K2CamaroSS

iTrader: (18)

well that's the thing...I ported and polished the Stock MAF ends so I don't have anything to revert to. I guess, I need to get a MAFT

2K2CamaroSS

iTrader: (18)

Thanx everyone for all the input. I guess it's time to buy a MAFT and get some tuning done

Vettepartz

Killer01WS6, when you say 12.8 is best for max torque and 13.2 best for max HP, I assume you mean on a dyno and using a wideband, not on the street. Should the curve stay near the 13.2 and dip to 12.8 at the max torque rpm, or stay at 12.8 and rise at the max HP rpm? In other words, what do you want the A/F to be at WOT (Cell 22) when you are not at the max HP/Torque rpm's?

MOBE

Thanks killer! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

BLK02WS6

iTrader: (2)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 2K2CamaroSS:
<strong> well that's the thing...I ported and polished the Stock MAF ends so I don't have anything to revert to. I guess, I need to get a MAFT </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Buying a stock MAF would be cheaper than buying a MAFT! And get you out of a very dangerous situation!

The tiny gains that you get from that ported and polished MAF aren't going to be worth it when your motor is dead!

2K2CamaroSS

iTrader: (18)

hmm...now that you mention it, I do seem to hear some knocking under WOT excelleration.....Is this dangerous? at what extent will this cause damage?