jthrasher1

hi everyone or whoever may read this i recently boosted my accord i did pretty much everything all good car runs fine its currently runnin 7 psi and i broke it in for like a week or so and finnaly got on it and when i did i got a cel light and the car ran like crap after the light came on for manifold pressure circuit to high i bought one of those adapters for the map sensor but with it on the car would not stay running its only when i realy get on it otherwise no lights and runs fine just trying to find a way to solve this problem any help would be really apreciated thanksssss..

GhostAccord

Not a boost guru but I would imagine that you require a 3bar MAP sensor and a tune. There may be some sort of hack out there that you can do to try and trick the OEM MAP and ECU. You'll have to wait for the boost guys to chime in. Other than that I know for sure that a boost freindly MAP sensor and a tuned ECU will remedy your problem for sure.

NeKe1point0

TYPICALLY the stock map will be fine up to 10psi... Its strange that it would be having issues at the 7 lbs your trying to run.

An OMNI/Hondata 4 bar will solve your issues and will never be a restriction in the future when your trying to make more power

jthrasher1

i bought a generic spacer made by obx its like a 2'' spacer but the place that installed it said with it installed the car wouldent run right im gonna try it again c what happens... and if not ill try the 4 bar and hope it works thanks for your infoooo...

accord2nrz

Well let me just clear the air here. Many Honda MAP sensors can read up to 10lbs. the 5th gen accord MAP cannot. If you push hard into 2 lbs of boost your car will buck like that and give u the CEL and then you'll have to turn the car off and turn it back on to reset it. It's terribly annoying.

I've experimented with all this stuff and learned many things the hard way. You should be looking for a missing link adapter but even so if you're not tuned then you’re shortening the life of your motor 10 fold.

The Hondata 4BAR map sensor will NOT work with an OEM ecu because the ECU itself is not programmed to correlate the voltages from the pressure sensor to manifold absolute pressure values. If you can reduce your boost take it down to about 2lbs until you can get it tuned. If you have a standalone EM option then you're ok with the Omni 4BAR. (I know this because I have spoken with Hondata at great length about this.)

The factory ECU can adjust roughly 10 - 20% for changes brought on by boost in factory form. With the missing link adapter at 2lbs your ecu can adjust giving you just enough fuel to not blow your motor and not cause a CEL and act like a tard after going into boost.

If you're using a piggy back option you will need to get a secondary map sensor, (GM 3 bar or Motorola 2.5 bar) and program the values in that way since the OEM ECM will still be looking for the factory map sensor both before and after boost so your car will run like factory when not being pushed.

jthrasher1

thats exactly what the car does i have to turn it of and start it again right know im tuned on a afc neo not the greatest way i know but theair fuel aneverything is all on point besides the map sensor the car runs beautiful theres nothin i can do to bypass or solve this prob with the neo and the stock ecu.... but i was also thinkin on convertin to obd1 and using a po6 computer and chipping it on chrome or some other program anyone have any recomendations on a good program i know its kinda off topic but just wondering and thanks for all the infooo...

GhostAccord

Chipped P06 and tuning software is a good way to go. I've chipped a number of ECUs without any training in electronics. It's all about the amount of soldering & desoldering practice you do before chipping your first ECU.

As for software & hardware I would suggest eCtune software and Moates hardware. Check out eCtunes website for tuning packages. However, I started with CromePro and never had any real issues with it. Using the newer CromePro Gold ROM is a nice feature. There is also Neptune as well but I have never used it.

HonBeer

That sentence needs a couple of periods in it. Hard to read. Where is the 4th grade grammer @?

accord2nrz

+1 to GhostAccord I agree with chipping your ecu and tuning with crome, neptune, or even hondata.

I like the emanage don't get me wrong but umm yea, it can be a real pain. Plus chipping it will give you more control over tuning. Messing with ob2 is rough lol. You're fighting it every step of the way.

Atreidies

Chipped and tuned is the only way to go. Otherwise, you're throwing grenades around, just waiting for the pin to fall out of one.

redtop8726

agree with ghostaccord chipping the ecu and getting a good tune, otherwise your asking for problems.

twkdCD595

Obviously the OP seems to be trying to use obx's piece which is like a missing link to keep the map sensor from seeing pressure instead of actual management. Which is crap and a pita to deal with... I am in agreement with those saying get some real management and proper tuning. There is TONS of options for quality managment other than that.

Just for reference though to clarify since it reads funny I think. A stock OEM map sensor on an 5th gen accord will read up to about 10-11psi actually... then you reach its max voltage range. The bucking and cel light your refering to is because the factory Honda calibration in the ecu reacts accordingly to seeing boost, not because the hardware is not actually capable. You have to be running some kind of management which addresses and corrects for this. Once you do, it will work just as any other up until you reach its limited range.

In one of the posts above also it makes it kinda read like you need a AEM, Motec, or some other non OEM ecu based management to use something like a 4bar aftermarket map sensors... which is not correct and not quite what I think they were wanting to saying. Agian its the factory Honda calibration in the ecu thats the problem, not the actual hardware. Hondata, Crome, Ectune, etc all are OEM ecu based systems that address this and can support a variety of map sensors, among other things.

jthrasher1

ok sounds like im goin to go with an actual emangemant cars only bin done for 2 weeks this was just to get it goin on the afc but i apreciate everyones info on this and ill let ya know how i make out when i do thanks again people...

twkdCD595

You can search for the AFC hack thread from ages ago if you dare attempt it. The basic idea was that you could put in 450cc dsms and pull a ton of fuel out with the AFC to run them, while in doing so you have cut map sensor voltage enough (since thats how the AFC works is by manipulating map voltage) that you coul run into boost without actually being at the voltage which would normally otherwise kick the cel and limp mode. Its kinda half *** by todays standards cause we are so fortunate to have good management everywhere and cheapish. I got away with running it some years ago for a short couple month period of time until I was able to do a swap to a p28/ s200 hondata setup.

Among other disadvanges you will find, a couple big disadvantages with the AFC hack (besides not being the best method for our boosted cars to make fuel corrections in general) was also a total lack of timing control and part throttle lean conditions. No timing control means basically you had to resort to retarding the base timing with the distributor (which few bothered to do but worked for me), or add more electronics for timing control which negates the purpose of why people attempted the hack... which was cheap solution before the market developed like it is now. Part throttle lean conditions are self explainitory, leaning out while coming into boost is gonna make for a bad day.

Add to that, alot of people at the time were simply guessing at fuel values for "tuning" from what they read someone else used (who probably guessed at values too). Yeah you can see why it was common to see problems with the hack.

Can it work, if you did a base timing retard, did not hang in part throttle areas where it would lean out while boost could build, tune on a wideband, etc... sure... but its still a sketchy method asking for problems. By the time you invest the money and work into making an AFC hack even kinda ok, your basically not far off from the cost/ time involved in real management.

for thinking about better solutions than an AFC hack.