Help please....

[bvr463]

i have a s14 with a rb25det inside that i purchased, car has a front mount ic, and safc, other then that it is stock.

My question's is

1. Car spools super loud and fast, turbo has no play or doesn't smoke, boost gauge showing about 5-7 psi but car dont go no where, and sometimes it does just pick up and gooooo.

2. sometimes sounds like i have an exhaust leak from the drivers side to the front of car, but checked everything and no more leaks.

3. Took safc out and hook wiring harness back to stock ecu and car runs like shit.

4. High reving in boost car starts to backfire or fut.


PLEASE HELP ME

[Sileighty_85]

check the ECU for codes.

Could be either Boost leak, bad sensor or timing, maybe even the clutch is slipping.

It seems like that SAFC needs to be wired in, Prev owner might have installed a Z32 MAFS or bigger injectors.

[bvr463]

how do you tell what kind of maf it is? nah they are stock injectors.


a little boost leak would do that? but the boost gauge still shows proper psi..

Bad Sensor? like what kind?

Do you think it could be a fuel issue? or bad maf sending intermitent signals to ecu saying richer or leaner?

[Slidin' Sam]

You rather have a boost leak/vacuum lines routed wrong &/or faulty actuator. Try and talk to the previous owner, if possible, and see what the SAFC was all about.

[Sileighty_85]

how do you tell what kind of maf it is? nah they are stock injectors.


a little boost leak would do that? but the boost gauge still shows proper psi..

Bad Sensor? like what kind?

Do you think it could be a fuel issue? or bad maf sending intermitent signals to ecu saying richer or leaner?

RB MAF Tag is either a Green tag (Series 1) or a Pink Tag (Series 2)
Ppl will upgrade to a Z32 MAFS (Orange Tag)

youp boost leaks will cause a rich condition and cause slow acceleration

[bvr463]

rb is a series 2 with the series 2 maf...

when you say bad actuator, you mean the wastegate.

one of my friends said that the safc is probably put in there to hide something that is wrong with the motor or electrical or fuel... because taking safc2 out of circuit and run car off of rb stock ecu, car should run fine, but it dont :(

[Slidin' Sam]

The actuator controls the internal waste gate on the OEM turbo.

Yes, the SAFC is probably covering something up. Try resetting the ECU and see if it makes a difference...without the SAFC. But I am betting on your vacuum being routed wrong/boost leak.

[bvr463]

i know that the wastegate actuater is rusty, are you suppose to be able to move it with your hand or should be very hard to move?

well there aint to many vacum lines on this motor that i can see... when you say vacum lines hooked up wrong, how can you hook a vac line wrong, what exacty should you hook it up too...

Oh the blitz bov is not being recurcilated, is that a problem?

[Slidin' Sam]

Your actuator shouldn't be corroded. There should not be much in/out play with the actuator rod...it should be pretty stiff.

Vacuum lines can be routed incorrectly. Ex: your lines to/from your BOV could be routed incorrect, creating a boost issue.

Your BOV could be your problem. I would have to see it though.

Where in Hawaii are you located? I'm currently staying in Aiea, so if your near I might be able to meet with you and take a look at your car.

EDIT: Just looked up Hilo, HI. Your on the wrong island! lol

[bvr463]

i seen ur post about the rb25, wow nice built and thats going to help alot of people out there.

the bov is just hooked up like a civic turbo car would be to open air, not back into the maf area.

my car just has a mind of its own...just wanted the car to be a daily driver with alittle power, but cant even do that :(

[nissanfreak317]

i know that the wastegate actuater is rusty, are you suppose to be able to move it with your hand or should be very hard to move?

well there aint to many vacum lines on this motor that i can see... when you say vacum lines hooked up wrong, how can you hook a vac line wrong, what exacty should you hook it up too...

Oh the blitz bov is not being recurcilated, is that a problem?



Wastegate actuator will be difficult to move by hand but can be easily tested by applying regulated pressure to it and seeing if the rod opens the flapper door. just don't blow too much at it, use a regulator set to 5-7 psi and look for movement of the rod.

Do you have an FSM for your RB yet? That should show vac line routing pretty clearly. They are usually available online for free download. google it.

Non recirc Bov is not really an issue. Plenty of guys (including myself) run them without anything more than a few extra backfires going on. But the bov could easily be the source of a boost leak, might wanna check that out too.

[bvr463]

This is a stupid question but what is fsm?

[bvr463]

wait never mind i know what a fsm is

[bvr463]

bump to the top

[Slidin' Sam]

Why did you bump this thread? What do you still want to know?

[bvr463]

To see if anyone else has other info that might help out too.

[Destructodc74]

it sounds just like you have an exhaust leak from the manifold to the turbo, that happened to me and it would randomly spool and youd get going but other times it wouldnt spool because it didnt have the back pressure

[Big Zee]

what steps have you tried to fix it with yet ?

[bvr463]

Nothing yet, I have no time right now. I'll let u know when indo.

Do u have any other suggestions?

[patch240]

you may have to recerculate the bov if its not my rb ran funny when it was purging to the atmosphere and one it was recirculated it ran great

[smoked240]

you may have to recerculate the bov if its not my rb ran funny when it was purging to the atmosphere and one it was recirculated it ran great

did you use the same BOV or a different one?