i have recently boosted my accord and im having a problem with my map sensor the cel light comes on when i really get on say like max rpm is 6200 and i get over say 5500 it pops on saying manifold barometric pressure high.... and the car after you let of the pedal runs like **** but shut it off and start it again its fine...now heres what i dont get people say your stock map reads up to 11.2 lbs of boost im running 7lbs whys the light come on any help would be apreciated thanks......

 

are you tuned?

 

only on a afc neo right now... but im converting to obd1 and gonna have it chipped and tuned on chrome just wondering if im still gonna have a problem with the map sensor pretty much

 

Maybe the CEL comes on is because even though the stock Honda MAP can read up to 11 lbs of boost, your stock ECU doesn't recognize the signals. I'm not a boost guru so I'm not 100%. Realistically, It should throw a CEL/shut down the car because it sees an out of spec signal. Once you get a chipped ECU it will be able to recognize the boost signals from the MAP sensor. If you plan on doing any real boosting you are going to need a 2 bar or 3 bar map anyway.

 

yup, what he said

 

correct. you can use the stock map for <11psi only if you have a chipped ecu that is mapped for boost.

currently, you would need a missing link to prevent the map sensor from seeing boost but i dont reccomend it. get tuned and until then stay out of boost.

also, what injectors and fuel pump are you using? those should be upgraded as well.

 

i got dsm 450cc injectors and a walboro 255 fuel pump... so if i keep hitting boost is it gonna hurt the motor if so im not even gonna drive it till tuned thanks guys...

 

ya just get a chipped ecu. get it flash tuned for like $40

 

Not sure if the MAP being used is different in the US than elsewhere, but i ran 12psi on a stock MAP for a few years without ever having a CEL (using a chipped ECU). Peak boost i saw was 1 bar, again no CEL.

 

correct, you will not get a CEL but the map sensor reaches maximum voltage at i believe 4.8 volts or 10.7 psi. so after that point the ecu is just reading off your last boost column and doesnt really know the difference between 11psi and 14psi. so the ecu will continue to fuel and time the motor like you were still at 11psi. obviously this can become a problem as the car can run lean with the increased boost pressure.

ok good you already have the right fuel system. now you need a chipped ecu and tune. im actually surprised the afc is able to control those 450s on a stock ecu. anyways, i would not boost the car because you are basically untuned and your stock ecu cannot handle boost. the CEL is actually trying to protect your motor by putting it into limp mode whenever you see boost.

bottom line: get the car tuned, unfortunately it doesnt cost $40 as someone stated above. look to spend a few hundred dollars for a proper dyno/street tune.

 

I wasn't talking dyno/street tune. Those are like 125$/hour but depends on the shop. I was talking about the chip in the ecu. Get that flash tuned for now after you get the ecu for turbo. Then start saving at least $300 a decent tune from a shop.

 

ok you are referring to a basemap for the ecu which will compensate for the bigger injectors. Good for start-up and getting to the tuner not ok to boost on though since actual afr and timing is unknown

 

Yup, its just a temp fix. So that you can break everything in before you dyno. You don't want to be on the turbo during the dyno and not have it broken in.

 

ok i bought a obd1 po6 computer from a civic 5 speed non vtec someone told me that would be the best for my car... and i talked to some guy who runs a shop near me and said he could chip the ecu and tune it on chrome pro and also 2 hours on the dyno for $360 bucks that should do the trick right.. he tunes hondas sooo that sounds like a resonable price to me what do you guys think

 

That is exactly what you are looking for. That is a good deal too.

 

Yes, good deal

 

ok guys so here goes i go to the place thats gonna chip and tune it and the dude chips the po6 plugs it in and a cel light comes on for somthing to do with the distributer and at idle the map sensors reading 10.7 lbs of boost he tells me i have to change my distributer to an obd1 dist.. and change my map sensor any info i dont get it i was told chip and tune dont have to change anything else.

 

The MAP sensor I will agree with. I'm not sure about the distributer. What did he say was wrong with the one you have? Wrong wiring, 180 degrees out?