RacerXI

What happens when a stock maps voltage is maxxed out? My car has seen a boost gauge/EBC seen 14psi before.

This is in question to jordo's thread below.

PM-Performance

ive ran over the stock map already. I never had any probs with it that i saw. Some say it will throw a cel or kinda like shut the car down or go in limp mode. but i have surpassed it already in my R

Tchleung

It's kinda a hit and miss. I know one guy running 13PSI on stock map cosntnatly. and that is a OBD0 map sensor as well which reads even lower then OBD1+. I'm running OBD1 map and saw about 11.8PSI constantly without problems. but as soon as I hit 123 PSI then the car would go into limp mode.

RacerXI

I've seen 1.2bar on mine peak w/ my AVC-R. I guess my question is what is your a/f doing in this seemingly "grey" area?

btw. I run .7 daily.

093turbo16

iTrader: (2)

it is just using the last area of the fuel tables since it can't read any higher.

PM-Performance

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93turbo16 &raquo;</TD></TR><TR><TD CLASS="quote">it is just using the last area of the fuel tables since it can't read any higher.</TD></TR></TABLE>


thats what im thinking too.Cuz i know with Hondata, you can use over a 3bar, but it will only use the fuel and timing tables of the last column , 29psi i think it is. ?

I didnt have a wideband on my car when i had the stock Map in it though. only put it in once i already had the 3bar in it. so i cant say what my A/f was like.

tgreaves

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93turbo16 &raquo;</TD></TR><TR><TD CLASS="quote">it is just using the last area of the fuel tables since it can't read any higher.</TD></TR></TABLE>

If your running a hack then when you get to the end of the map sensors voltage and IF you still arent sending enough voltage to the ecu to see 1psi then you can boost up to 1000psi and never have a fuel cut.. If your running a check valve and fmu then the 10.8psi limit of the stock map sensor doesnt apply to you but I wouldnt do that for other reasons..

But 93turbo16 is right, on a tunable system when you reach the 10.8psi limit of the map sensor the ecu isnt going to see above that boost level and youll be running on the last load line in your program.. Basically its just going to keep leaning out until you blow something..

RacerXI

thx guys. Also..did a gm 3bar "fix" this issue or did it continue. I'm asking b/c i'm not sure my .7 EBC/boost gauge reading is equal to the MAP 10.5psi I was tuned at. I plan a trip back to the dyno anyway, but I want to make the 6hr round trip worth it.

CRXdan

I get a hesitation or bucking whenever I hit over 10 psi.

Tchleung

My A/f are still perfect when boosting over 11psi on stock map via datlogging wideband

093turbo16

iTrader: (2)

it can still be perfect. The map sensor just can't see anymore boost. It maxes out and reads as high as it can.

Tchleung

Yeah I know. I'm jsut asying it wasn't leaning out after max map capability and more air. For those that were thinking you'd start leaning out really bad.

kleefton

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tchleung &raquo;</TD></TR><TR><TD CLASS="quote">Yeah I know. I'm jsut asying it wasn't leaning out after max map capability and more air. For those that were thinking you'd start leaning out really bad.</TD></TR></TABLE>

You were probably tuned at the higher boost while your map sensor thought it was still 11psi. The downside is that if you actually lower the boost to run 11psi actual you will run pig rich as hell. And if you go over what you were tuned you will lean out like a ****.

Not good.

Tchleung

I'm tuned for 10psi. I street tune everythnig myself. But maybe that 1psi isn't a big enoguh diff to change my a/f... my EGT's were nice and safe. oh well. :D