i have a turbo'ed b18b1 with FMU and check valves. im looking into getting a missing link but i heared about this. so u buy a 3 bar map sensor and it plugs right into the throttle? can someone enlighten me? all i got using search was for classified and nothing technical.


Modified by 98B00STED at 12:49 PM 4/25/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98B00STED &raquo;</TD></TR><TR><TD CLASS="quote">i have a turbo'ed b18b1 with FMU and check valves. im looking into getting a missing link but i heared about this. so u buy a 3 bar map sensor and it plugs right into the throttle? can someone enlighten me? all i got using search was fron classified and nothing technical.</TD></TR></TABLE>

No, you need some kind of electronics to interpret the 3bar map signal, since it is so different than a stock honda MAP.

-PHiZ

 

you soder it into your map sensor wires... but I believe your ecu has to be able to read it.. dont hold me against that

 

correct....you can cut the wires to your stock MAP sensor and rewire (solder) them to the 3 bar MAP. Correct me if I am wrong, but I do believe that you need some kind of EMS (AEM, Hondata, etc...) in order to correctly read the signal.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dunc &raquo;</TD></TR><TR><TD CLASS="quote">correct....you can cut the wires to your stock MAP sensor and rewire (solder) them to the 3 bar MAP. Correct me if I am wrong, but I do believe that you need some kind of EMS (AEM, Hondata, etc...) in order to correctly read the signal.</TD></TR></TABLE>

what form does the 3 bar come in?

 

what do you mean what form?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dunc &raquo;</TD></TR><TR><TD CLASS="quote">what do you mean what form?</TD></TR></TABLE>
like in the form of an ecu chip or something like that..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jBj &raquo;</TD></TR><TR><TD CLASS="quote">like in the form of an ecu chip or something like that.. </TD></TR></TABLE>

http://www.robietherobot.com/storm/mapsensor.htm
http://hondata.com/tech3barmap.html

-PHiZ

 

The GM 3BAR MAP sensor looks like this:

 

the above is right on.

 

nice, good info guys.
so Hondata s100b's map sensor only reads up to about 11psi?

 

Hondata will read to the limit of whatever MAP sensor it is programmed to use. If it is programmed to use the stock MAP sensor, then it will read to 11 PSI, because that is all that the stock MAP sensor can read. If you change out the MAP sensor, then you must get your Hondata system programmed to use it.

 

Ok, I have hondata and assume stock map sensor, but last year i was running up to a max of 14psi. was this a foolish move?

 

14psi on a stock MAP is way beyond foolish...surprised nothing blew up to be honest.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dunc &raquo;</TD></TR><TR><TD CLASS="quote">14psi on a stock MAP is way beyond foolish...surprised nothing blew up to be honest.</TD></TR></TABLE>


So any 3bar is good to use? GM?

 

GM is okay, I had some problems with mine up around 20 PSI. I'll be using an AEM MAP going forward.

 

I probably wont boost much higher than 14 or so. How much is the AEM map compared to the GM? is the GM a good idea if i am stickin around 15psi?
Also, last year i got a shop to install/tune hondata s100b and they set my boost at the 14psi max for me. nothing was said about my map sensor so it would still be stock right? lucky i know about this stuff now, even though my setup is running quite rough.

 

more than likely your map sensor is stock if you don't know about it, and nothing was said. I can't support or deny rmcdaniels claim of his GM having problems around 20psi. Haven't tuned any GM's with that kind of boost yet. If you give me 6 months or so, I'll tell you how the GM holds out at 27-28psi

 

ok cool, I will go for the GM 3bar cause i am pulling my car outta the garage soon and am in need of new turbo/tuning very soon, i'll give it a try at 15 psi and see how she goes. Is there a specific GM 3 bar that I need or are they all the same?

 

call http://www.camp1320.com Tom he has them for like $65 last time I checked.

 

GM 3BAR map should work fine for you, and I've had nothing but good prices and great service from Camp1320, so I'd recommend buying it from them. Make sure you buy the plug for it too, otherwise it's very hard to connect it to your system.

My problem with my GM 3BAR MAP sensor is that it got non-linear above 18 PSI, so while it indicated the same voltage at the same pressure, the change in voltage per PSI was less above 18, so my ECU said I was running 20-21 PSI, but my boost gauge said I was running 27-30. This caused some problems that led to the melting of my pistons. It may have just been my GM 3BAR, but I've heard from a couple of other AEM EMS users that they've seen the GM 3BAR's do that before. When my new pistons are in next week, I'll be running with an AEM MAP sensor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jBj &raquo;</TD></TR><TR><TD CLASS="quote">I probably wont boost much higher than 14 or so. How much is the AEM map compared to the GM? is the GM a good idea if i am stickin around 15psi?
Also, last year i got a shop to install/tune hondata s100b and they set my boost at the 14psi max for me. nothing was said about my map sensor so it would still be stock right? lucky i know about this stuff now, even though my setup is running quite rough.
</TD></TR></TABLE>

You should be able to see if you are still using the stock MAP sensor. Look and see if it's plugged in. It sits on top of the throttle body, here's a pic of mine:

 

Just wondering about people's thoughts on using the GM 2bar MAP sensor if you won't be going above 15psi? My thought is that a 3bar map on anything but a fully built motor handling 15+ psi is sorta useless (compaired to a 2bar), since you have much less resolution for the 0-15psi range (half the columns in your ems). From what I've seen over at the uberdata forums, a 3bar map also has a shitty non-linear curve in vacuum, and needs a complete retune for vacuum since nobody has the curve for it.

My guess is that above 20psi on a GM you'll have to do what you do for vacuum - retune every column. If it reads 22psi when it's really 27psi (and say 20psi when it's really 22psi), if you tune it starting w/lower boost, and tune it after every 1-3 psi increase in the wastegate, you'll be good. Based on the fact most people pusing 20psi+ are dyno ******, it'd be cheaper to go AEM 3bar than multiple dyno runs, I'd assume.

 

haha, dyno *****? That's a good one Hmmm, I guess I am guilty of being a dyno ***** because I have done just that....tune it for every amount of vaccum and boost at every possible RPM (one by one).

 

we run 25 psi on a GM 3 bar, no problem.