is a gm 3 bar map sensor necessary for a FI b18c? i see alot of ppl using them, but is this a necessary piece? Thanks

 

For any kind of boost you will want to use a larger Map Sensor. The Stock one without a missing link will cause a CEL.

 

yea i looked into the missing link too, but which would be the best way to go? gm 3 bar map sensor, or stock with missing link?

 

stock can read to just over 10psi if u are using decent engine management.

 

the only reason we use a gm 3bar is to boost beyond 11psi....12 can be had by richening up the last coulmn but a gm 3bar will let you go to 28.6psi....a motorola 3bar has better resolution down low at idle though...yet the fact htat it is extremly tiny

 

what is the missing link you are talking about?

 

Here is a link to the makers of the missing link, and they are a sponsor on H-T.

http://www.synapseengineering.com/

 

well my engine management is AEM EMS. and i will be pushin well over 10psi. so would the gm 3 bar map sensor be something i need?

 

indeed it would

 

cool well just wondering is 75 bucks a decent price for one brand new?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RedlineKustomz &raquo;</TD></TR><TR><TD CLASS="quote">cool well just wondering is 75 bucks a decent price for one brand new? </TD></TR></TABLE>

I paid $85 shipped with the pigtail from http://www.gmpartsdirect.com way back in the day.

 

I have them for $60

 

ok one more questions....what if you push boost above 28.6psi? what will you do then?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RedlineKustomz &raquo;</TD></TR><TR><TD CLASS="quote">ok one more questions....what if you push boost above 28.6psi? what will you do then? </TD></TR></TABLE>

You can buy a AEM 3.5 or 5 bar map sensor

 

ok then which should i go for with power goals of right now 450whp on 91 octane? i mean once i finish my build i am working on the interior and gettin all my gauges, seats, and all that done then i am goin to go back and work on the motor more with bigger piping, turbo, etc. and hopefully on race fuel pull numbers around 700whp and on 91 octane over 500whp. but right now i am goin for 400 to 450? would the 3 bar do me? or will that need over 28.6psi to achieve that?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RedlineKustomz &raquo;</TD></TR><TR><TD CLASS="quote">but right now i am goin for 400 to 450? would the 3 bar do me?</TD></TR></TABLE>

Yes

 

You will be fine with a 3bar for the 400-450whp range.

 

just have to upgrade it later on though?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RedlineKustomz &raquo;</TD></TR><TR><TD CLASS="quote">just have to upgrade it later on though?</TD></TR></TABLE>

If you want 700+hp you would more then likey have to.

 

I'd go with the 3 bar for now, if down the road you want an AEM 3.5 or 5 bar, sell the GM 3 bar and pick one up

 

ok thanks alot. i will start searching for the best price and order me one here real soon.

 

The best way to find out what MAP sensor you need is to take the MAP rating of the sensor, subtract 1 bar. The number you get is how much that map sensor is good for. So say for a stock Honda MAP sensor which is rated at 1.7 BAR. Subtract 1 bar you are left with 0.7 bar or about 10-10.5 psi. To convert bar to psi multiply by 14.5.

Here are some other examples

2.5 BAR map sensor is good for 21.7 psi
2.5 - 1 = 1.5
1.5 x 14.5 = 21.7

3 BAR map sensor is good for 29 psi
3 - 1 = 2
2 x 14.5 = 29

5 BAR map sensor is good for 58 psi
5 - 1 = 4
4 x 14.5 = 58

You get the idea...use the smallest BAR rating you can get away with. For example if you think that you will be able to make 400 HP at 18 psi, then get a 2.5 BAR map sensor, not the 5 bar sensor.

 

https://honda-tech.com/zerothread?id=1406777

 

ok so how much boost will everyone in here think i will be running? 450whp on 91 octane with a fully built motor pushed by a gt35r turbo on a b18c gsr motor

 

if u plan on upgrading map sensors. then go with the 2.5 bar. 21.7 psi is enough to net 450whp+ with the gt35r and a b18c.