Map sensor missing link and fpr ? - Tuner-Junction

g2nick · #1 (**permalink**) October 10th, 2006, 07:09 AM

I need some clarity. Ive heard that the stock map sensor can read up to 12psi of boost. But Ive also heard that it cant read boost, because obviously your not reading vacuum on a FI car, since it is under pressure and that is why you need to run the missing link to block the vacuum line....does this make sense what im saying? Or am I just confused? Im going to be running larger injectors with a re-chip and a basic turbo map with a walbro255 in tank pump for management for now. Will I need to run a missing link? How does that work? Also, do you need a fuel pressure regulator that can read boost since they have a vacuum hooked to them?

ATISTANG · #2 (**permalink**) October 10th, 2006, 06:05 PM

Quote:

Originally Posted by g2nick

I need some clarity. Ive heard that the stock map sensor can read up to 12psi of boost. But Ive also heard that it cant read boost, because obviously your not reading vacuum on a FI car, since it is under pressure and that is why you need to run the missing link to block the vacuum line....does this make sense what im saying? Or am I just confused? Im going to be running larger injectors with a re-chip and a basic turbo map with a walbro255 in tank pump for management for now. Will I need to run a missing link? How does that work? Also, do you need a fuel pressure regulator that can read boost since they have a vacuum hooked to them?

NO, not to me atleast.
To my knowledge the stock MAP will only read vacuum, now it might not set a check engine light and give you trouble till 12psi, but idk.

As for the FPR, you can run the stock one, it will be fine, they do make FMUs that are boost sensitive but I wouldn't recomend going that route as its basicly a redneck way of tuning for boost.

macbasq · #3 (**permalink**) October 10th, 2006, 06:50 PM

according to hondata, honda ECUs can register around 11 lbs of boost before throwing a code.

njn63 · #4 (**permalink**) October 10th, 2006, 07:05 PM

missing link is a ghetto solution basically. It's basically a check valve that allows the map sensor to read vacuum but not see over 0 psi. Problem is, it also doesn't compensate for that extra air unelss you're running an FMU setup... which the Honda scene has gone away from in the past 4 years. A unmodified Honda ECU will freak out when it sees boost though and throw a code so people used to use this setup before Hondata and all the other ECU modding programs.

As said, the stock map sensor will read 11psi before giving issues. Stock FPR is fine. I'd use a basemap to limp around but you should really get it properly tuned. If you're running a few psi it's fine but with the setup you have in your sig it'd be stupid not to.

g2nick · #5 (**permalink**) October 10th, 2006, 07:45 PM

Quote:

Originally Posted by njn63

missing link is a ghetto solution basically. It's basically a check valve that allows the map sensor to read vacuum but not see over 0 psi. Problem is, it also doesn't compensate for that extra air unelss you're running an FMU setup... which the Honda scene has gone away from in the past 4 years. A unmodified Honda ECU will freak out when it sees boost though and throw a code so people used to use this setup before Hondata and all the other ECU modding programs.

As said, the stock map sensor will read 11psi before giving issues. Stock FPR is fine. I'd use a basemap to limp around but you should really get it properly tuned. If you're running a few psi it's fine but with the setup you have in your sig it'd be stupid not to.

Ok, thanks for the replys that makes more sense to me. As far as a base map, its tough finding someone that will tune with obd0. If there was someone that could tune it using obd0 I would have it tuned to boost 18psi, which is where I think it will max out on pump gas. So until I switch to obd1 and get a 3bar map sensor 11psi is it for now. Ill get to 18psi by next summer, I have the obd1 dizzy, just need the ecu, conversion harness, and a wideband that reads narrow band instead of just going to a 4-wire o2 sensor.

street_accord94 · #6 (**permalink**) October 10th, 2006, 09:06 PM

where are you located? I know a few east coast tuners that work on turbo edit (an obd0 ems solution)

g2nick · #7 (**permalink**) October 11th, 2006, 07:10 AM

Quote:

Originally Posted by street_accord94

where are you located? I know a few east coast tuners that work on turbo edit (an obd0 ems solution)

St Augustine, Fl 32086
Its northeast florida....
Phearable is in tampa which is about 3hrs from me, but from what I can tell they dont do obd0.... There are places in Jacksonville, Fl but none that I know of that do obd0.....any help would be great, thanks...

triniskill · #8 (**permalink**) October 11th, 2006, 11:42 PM

Here check xenocron out...

http://www.xenocron.com/packages.php?page=package_cover

chris harris is good...id say go with package 2 and get the chipped ecu and he'll either install turboedit base map or BRE..unless you dont want to buy another ecu...
He is real good..Give him a call and explain what you have..He should lead you in a good direction..