feels slow, explodes on boost...

[seanman]

So starting from a few days ago, i timed my car and installed my adjustable fpr. the car ran great, i even drove it to work the next day. well after my shift that next day, i turned on my car and heard a loud vibrating noise. i traced the sound to my new fpr. i tried adjusting the pressure cause it looked really high, then something popped in it and the gauge spraing and was just hopping around at 70psi ish area. i got it home and removed the afpr right away and drove it around, it seemed ok. i started noticing yesterday that my car is really laggy under acceleration, and it seems like my boost kicks in around 5-7k. i cant tell for sure because i need to replace my tachometer. i have a walbro 255 btw and it makes a now louder whining noise. then when boost kicks in, it kicks in to whatever boost i have it set to and its like an explosion of power.

[idahotuner]

well man. you had the FPR at double waht is hsould have been. almost.43.5 is waht you want i beilieve. some one needs t confirm that.

[srdub-t]

yea stock fuel pressure is 3 bar witch is 43.5 psi

[seanman]

well i had it set at 43 psi but it just flipped out and went crazy so thats what happened. and its kinda weird to time my engine: i pull the tps off and try and time it, and i can get it to where its supposed to be 15 +- 2 then the lines on the pully will just disapear until i tweak the cas a little bit in either direction.. what is up with that?

btw, when i did my engine swap, i lost the two connector ends that attach to the wiring harness for my apexi safc. so i dont have that hooked up right now but it would sure be helpful if i did. does anyone know where i can get those connectors?

[leroiboy]

firstly, i would also like some insight to the timing marks appearing and then dis-appearing-that is happening to me as well(or at least it was)

secondly, i just had the same problem with my walbro and boosting. it was loud just like yours. take your fuel pump out and you will find that the pickup sock is clogged-clean it out real good and flush your tank if you wanna be on the safe(r) side. that should eliminating the loud whining and late boost response.

[T-rev]

you could be running rich, like maybe one (or more) of the injector o rings is leaking after the high pressure incident. That would make you run rich and crummy untill the boost picked up.

Well untill you get it figured out, just stay in boost....all the time

[blinker_fluid]

when i did my timing it also jumped a little. I let it warm up, ran it at 2500rpm for a minute, turned it off unplugged the tps, set the idle to 800, started it snapped the throttle a few times and set the timing with a wire between the 1st coil and spark plug. I moved the CAS counterclockwise until the marks lined up. I could hear the engine changing +/- 100rpms at the same time the timing would jump a little. So I used my best judgement to determine where to set the CAS. I just listened to engine for where it sounded healthiest, and watched the timing mark and left it where it would stay in time about 70% of the time. No problems yet, cars been running strong for 6 months.

[seanman]

ill pull my plugs and check them for excess fuel, i'll check out my fuel pump but its like bran new, its only been running on that engine for like a few weeks.

[duffman1278]

Look down into your cylinders and see if the pistons are wet or completly dried up. If their wet, you're leaking fuel from the injectors.

Did you replace your vacuum lines when you did the swap?

[seanman]

only from boost control to wastegate. it feels like i have too much fuel, i cant say it for sure cause i need to look at my plugs, but its pretty sloggy for acceleration unless its WOT then around 4500 or so the boost starts burning the fuel more appropriatly and i have more response

[idahotuner]

be sweet if your tach actually worked so we could have the actual numbers that boost hits instead of guesses. but i say do what duffman is telling ya.

[seanman]

yeah, i just need a place to work on my car really. i can only do stuff that isn't much of a mess cause our house is up for sale and the realtor's dont want me workin on it infront of the house. BUT i do have that apexi, does anyone know where i could find the two clips that attach to the wiring harness for it?

[duffman1278]

Try starting your car with the throttle wide open, that way air gets into the cylinders and allows you to burn it off. Also, you might want to remove the fuel pump fuse and try cranking it a a few times to remove any excess fuel vapors. After that, try starting it and see if it makes a difference. But you really need to look down those cylinders to see if your pistons are wet. Just remove the coilpack, and spark plugs and grab a flashlight, not much work.

[seanman]

i checked my cylinders for flooding and everything was dry, so i dont think i have a leak. maybe my stock fpr is bad? what symptoms does a bad fpr have?

I also meant to add that i have an exhaust leak between my turbo elbow and down pipe. i know that doesn't really matter for turbos cause thats even less chance of back pressure, but with that leak i can smell alot of excess gas it seems. i've never really experienced an exhaust leak before but it seems like there is more fuel smell than there should be coming out.
Modified by seanman at 5:56 PM 2/20/2008

[T-rev]

you definatly have an issue with too much fuel, especialy if you can smell it at the tail pipe, or elbow. If you smell fuel, it aint right, trust your nose.

Just a thought, what if its not a fuel prblem? but what if you have a weak coil pack. Its not firing at low rpms, but comes to life at higher rpms. You're sure you're not running on 3 cyl?

I had the opposite problem once where it would cut out at high rpms, this was after a mechanic told me coil packs are either working or they're not, no inbetween. Yes they can be in between.

A hi flow walbro pump and a stock fpr always results in higher than stock fuel pressure. This isnt a big deal unless you've got an injector o ring thats leaking. Did you take out the fuel injectors recently? If you put them back in w/o lube chances are good you buggered up an o ring.

[seanman]

na i haven't touched the injectors. how can i test my coil packs then? i've read up on it a bit but its just not getting through to me lol. i need it like dumbed down

[duffman1278]

Can you smell fuel on your dipstick? If you can, I HIGHLY recommend you change your oil, this could possibly lead to a spun bearing I believe. If its not that, its still something internal that you'll hate yourself for if it happens.

Did you try swapping ECU's yet with someone else that has a working one?

[seanman]

ill check my dipstick. Theres noone i know around here with another sr swap

[duffman1278]

Yea that makes it hard, I ended up just gamb|ing it and buying an ECU myself and luckily it was the problem

[seanman]

haha yeah i've read that on another post you had. well i checked my dipstick and theres no fuel smell at all in it. I was driving it earlier and as a more in depth detail of how it runs, i notice that under alot of throttle, not necessarily WOT but just heavy acceleration that the car does not want to accelerate super quick. However if i slowly push down on the throttle, it will rev nicely and once im in the boost range its all green for go. I'm wondering how fpr's behave when they are going bad because i know i installed that adjustable one with the stock still on. bad move lol. could i have just ruined my fpr?

[bgsr240]

Get the proper fitting and remove the factory FPR.

[seanman]

what do you mean proper fitting? and can the engine run w/o the fpr??

[duffman1278]

I doubt it, there would probably be too much pressure going in.

Have you checked your fuel pressure yet?

[idahotuner]

i have a used stock FPR i will sell ya. for 20 dollars shipped. it worked great on my car but i upgraded. that could be your problem as well.

[seanman]

well i think if im gunna replace the fpr then i'll just go with the nismo adjustable

[idahotuner]

sounds good that might be your proble mthough now. so i would sugest cahnging it out and see waht happens

[duffman1278]

With the nismo adjustable FPR, you'll need a gauge in there to find out how much pressure your pushing to the injectors, just so you

[seanman]

haha i know. ill see if i can take apart my other adjustable fpr for its gauge. out of curiosity to why im having so much fuel, would a tps do that if it was going bad?

[duffman1278]

No.

[seanman]

so does a bad fpr sound likely then?