vtec_killer_

k just introduced boost to gsr ::::::::::::::
drag turbo kit.
walbro 255 fuel pump
stock FPR
Running fmu on stock injectors until i get tuned on 550's with hondata.

couple questions
will 100 psi ruin my motor? wash rings out?
why is it so high? i know fmu's suck
any hints or help would be appreciated...
could post more specs if need be.
thanks

boostedcivicsir

100 psi at idle?
either the gauge is wasted, or you have a problem.

is the fmu hooked up correctly? what regulator are you using?
inline pump? where is the gauge located?

SpoolnG2

Its definately not good or safe. Get the 550s and hondata asap. FMUs are extremely unsafe and not to mention you have nothing pulling timing under boost which is also bad. Dont blow it up, just get it tuned the right way.

inspyral

100psi under boost? That sounds about right for a 12:1 FMU. You're adding 12psi of fuel per 1psi of boost, so if your base fuel pressure is 40-50psi, 4-5lbs of boost will put you over 100lbs of fuel pressure. You probably shouldn't be boosting much if at all without an inline pump though, since even the Walbro in-tank probably isn't capable of sustaining the high pressure an FMU generates.

The fuel pressure itself shouldn't hurt anything, but since you don't have an inline pump to support the FMU, you're probably risking burning out that Walbro if it has to push that much pressure for extended periods of time. You shouldn't wash out your rings with stock injectors and a 12:1 FMU as long as your base fuel pressure is stock or close to it. Assuming you're referring to fuel pressure under boost, it's so high because the FMU adds a certain amount of fuel per pound of boost. If it's a 12:1 FMU and stock injectors, that's 12psi of fuel per every 1psi of boost. As stated above, in-tank pumps aren't usually meant to support high fuel pressures, so if you're running anything over a couple punds of boost, there's a good chance you're maxing it out and possibly even leaning out in the upper RPM range. The FMU only affects fuel pressure under boost, so your best bet would be to try not to go into boost until you get tuned on the larger injectors and ditch the FMU.

P.S. - As others have stated above, the FMU does nothing about ignition timing either, which is another reason to hold off with boosting until you get tuned.

tekturbo

Why didnt you just get the 550cc then hit up up phearable.net for a basemap ecu at least you wont blow it up until you get tuned.

miller

b&m fuel pressure gauges break on a constant basis. Get yourself a marshall or any liquid filled gauge before you go crazy.

I also see you have installed a 255lph fuel pump, i have seen this situation a couple of times. When people put the fuelpump in they sometimes kink or bend the factory fuel return line to the top of the tank and that will cause the fuel pressure to reach sky high numbers.


hope this helps

vtec_killer_

Sorry guys... about not being able to communicate with ya about this problem.. i have fixed this problem i took off fmu which i had 100psi at idle with the fmu on... i think it was a bad fmu.. but i have been tuned... I am running the 450's with the hondata and no fish valves and i love the feeling.. took it to chris whitfield @ whitfield racing and he worked my motor over and it pulled 247 hp and 178 tq @ 5 lbs. Is this a good hp and tq @ 5lbs with a low compression gsr. I wanted more but wastegate spring was maxed. So i will be going back for another tune with either 8 or 9 lb spring..