I understand what you're saying. Basically need to reference out the difference between mani pressure and atmosphere right?

So then, how would one go about getting the "standard" "hg from a kpa reading? I know there is a descrepancy between my Motec and autometer gauge. But when the Motec reads 50 kpa, the AM says ~14-15"hg. 10 kpa = ~25"hg. So, how does one go about converting the kpa reading to the standard "hg?

Check this link out brian: http://www.sensorsone.co.uk/pressure...onversion.html
* use the right hand side bar


Does anyone know off the top of there head if you decide to use negative lag on your primary injectors for the PFC, would you need to make you secondary injs negative too?
I changed my primaries to a -.30 last night and got my idle to about 12.9. I had to obviously re-tune my map but it was already pretty linear, all it needed was on average 20% more fuel across the board. PLUS I got my light throttle to finally read a LEAN AFR instead of always pegging 11.5afr, WOOT WOOT!!

is -15 in inches of mercury? It cannot be psi since complete vacuum on earth is -14.5psi. My idle is -7.3psi, or -15 in Hg

What units does the Motec show when you are in boost? Is it still kpa? Does the kpa value decrease when you open the throttle?

If the reading is kpa in boost:
The Motec most likely references absolute pressure. So all you have to do is a simple subtraction. Atmospheric pressure is 14.5psi, or 100kpa. Since the Motec reads 50kpa at idle, 100kpa(atmospheric) - 50kpa(gauge) = 50kpa (your vacuum), which is also equal to 14.764" Hg. Pretty smack dab where your AM reads!

Yes, it reads in kpa. 175kpa = roughly 10-11pounds of boost, becuase were subtracting the "reference" atmosphere. So, for example this morning she was idling and reading ~45-40 kpa, subtracting the "reference" gives us 55-60 kpa or 16-18 "hg as our gauges read it. Am I finally right? Can I stop cutting myself now?

Indeed, Brian, you've got it! You can stop cutting yourself, haha! I would pop open beers for us if I were there!

Update: I ended up going back to my old map set up and original inj lag settings. The negative lag was nice at idle but was causing a lot of issues. It would sparatically fall to extremly lean idle conditions for no reason, even after I map sure my inj firing MS and duty % were linear. EVen my base map idel area was linear to ensure no pulsing idle or abnormalities.

My idle with negative lag was around 12.3/12.1
With my orignal map with NO lag my idle AFR jumps from 11.2-11.5

I REALLY dont like the idle that rich because I know it will foul plugs and it makes my idle sound very "brap brap brap" ish. With negative lag the idle sound was a smooth pur.

my problem going excessivly rich at light throttle in cruise is fixed now becasue I just had some high numbers in my p2, p3 areas(You dont need to lower them much to get them lean when the base map inj reading is like .620 :))

I went out and took some pics yesterday before a three hour tune in 95 degree weather WITHOUT A/C. Sucked balls! I really wish I didnt remove that back in the day when I was trying to squeeze out as much power as possible from the stock set up lol.


http://i721.photobucket.com/albums/w...Vegas09067.jpg

http://i721.photobucket.com/albums/w...Vegas09089.jpg

http://i721.photobucket.com/albums/w...Vegas09116.jpg

http://i721.photobucket.com/albums/w...Vegas09072.jpg

http://i721.photobucket.com/albums/w.../engine001.jpg

EGT set up

http://i721.photobucket.com/albums/w.../engine002.jpg

http://i721.photobucket.com/albums/w.../engine003.jpg

I plan on moving the EGT gauges to my center consule this winter..
http://i721.photobucket.com/albums/w...Vegas09131.jpg

Video

http://i721.photobucket.com/albums/w...Vegas09201.jpg

Awesome ride man... I'm glad its all working out for you. That blue makes me want to get my FC on the road all the sooner.... I know its not the same, but something about blue FCs... mmmmmm...

Thank you bro! I like blue as well, it brings the lines of the car out very well.

Fantastic Sean! yeah that 95 day was kinda wierd. how many miles now?

157 mile now bro. Wish I could be there to pull the motor with ya tonight. bummer

Mmmm. Sounds good!

seck-say

Thanks for the kind words guys. I have about 289 on the motor now. This is gonna take a while BUT will be worth it.

Drive more ;) It's a combo of miles and heat cycles. Drive like 75 miles a day and you'll be real broken in in about 1.5-2 weeks ;)