alright guys im back and i got a question.

[leesredgt]

so last year i did a rb25 swap into my s13. got it running but it wanted to buck under boost, so instead of trying to fix it i got busy with work and pushed it to the side for about an year now, and todays the first time ive actually tried fixing it.. so im checking for boost leaks now. I bought a 2 inch pvc cap and a tire valve, and made a boost leak detector. so today i pull the top pipe of(stock crossover pipeing system) and put the cap in and clamp it down. i put air to it and it biulds no pressure at all and theres a whistleing sound.So me and my brother feel around for any air coming out and theres none around any of the coupleings but air is coming out of the maf.My question is should i plug off the maf? this is my first leak test so im uncertain.

[Joe]

you did it backwards

you have to remove the maf and pressurize it from that side.

there will be a small amount of leakthrough because of the PCV and throttle body system. so it wont hold pressure 100% perfectly, but finding a leak is very easy.

[leesredgt]

ahhh gotcha, ok thanks man.

[leesredgt]

ok i switched it around today and ive found one major leak that ive plugged off, it was the little black nipple looking thing on the black pipeing under the intercooler pipeing i had it plugged but the plug had broke.I got that fixed and theres still a big leak somewere on the passenger side of the engine, theres no leaks in the intercooler pipeing just from the left side of the engine. ive checked my FPR vacuum sources there fine, ive checked my boost controller sources there fine and the only thing that i have pulled vacuum for is a boost gauge which i ran of the factory location.Is there any other places on that side of the engine that pulls vacuum that i missed?

[DriftX]

I could be leaking from any pcv source, intake gasket, tb gasket, and any nipples on the intake for vac..

On the intake there is a source for brake booster vacuum, oem boost gauge, 2 on side for charcoal canister, 1 on bottom of tb and one going to pcv system.

[leesredgt]

i finally found it, it was leaking around the oil dipstick?

[Joe]

i told you its not going to hold pressure perfectly

you are charging air into your crankcase through your pcv because its not designed to see pressures like that. its normal.

your leaks are gone. something else is wrong

check your plugs and timing.

[leesredgt]

okay as long as thats normal thats fine i was just kinda startled to find the top if the dip stick broke and not sealing. any ways i havent even got to drive it yet so idk if it fixed the bucking problem yet, ill let u guys know.

[rb25drag]

What is your spark plug gap? Timing?

Also how much boost you trying to run?

[leesredgt]

its the stock plugs, and i dont know my timing yet. im just trying to run stock boost right now.

ok i went out and drove it, lets just say its alot better but its like when i acc. the car falls on its face and then all of a sudden boost hits all at once outta no were its like it has major major turbo lag.

[Joe]

check your timing and your plugs.

[rb25drag]

I noticed a major difference when I gapped my plugs to .022 and my timing set to 20 degree's.

[leesredgt]

i didnt think u could set it to 20 degrees without having to have sothing to offset it?

[Kansei240sx]

Next time you seach for leaks, use soapy water in a spray bottle.

Quit wasting your time here and go get a timing light, its worth the money and set your timing. Get a new set of copper ngks anything more is a waste of money for using on a stock turbo as well. 15 degrees is base timing like everyone said here and make sure you're not leaking out your IACV with the soapy water technique and cap off your PCV while testing it.

[leesredgt]

ok i checked my timing it was about at 10 deg. so i bumped it up and it still wants to hesitate but it does run better and i can feel more of the cutting out now so i think from the way it feels its the spark plugs.

what kind plug should i get and can i get them pregaped or will i have to buy a tool and gap them my self?

[Coolwhip]

I never trust pre-gapped. Buy the $0.99 gapping tool and be sure.

[Joe]

NGK, BCPR6ES or 7ES

7 is 1 heat range colder, you should be fine with 6's.

[leesredgt]

ok thanks, if i gap them myself what is the idea gap.

[leesredgt]

ok i put the new plugs in, took it for a drive and it drove great....for like 2 seconds.I went to a gas station like 3 houses down from my house, to there is was barely hesitating but was doing alot better so much so i even managed to bark the tires in second.From there i took it past my house and the more i drove it the worse it got, it got to the point about half way back home it felt like i hadnt done anything new to it at all.So now im back at square 1.would fuel pressure cause this? i have my nismo fpr set a 36psi with a walbro pump.

[rb25drag]

How much boost and what was your temps?

[mello88]

pull your plugs out, how do they look?

If your fuel pressure is 43.5psi without vac then it's set right probably something else.

[leesredgt]

i was running factory boost, my avc-r was off i dont even have it set up yet.and to be honest with you i didnt even look at my temp gauge i was trying to feel what the car was doing.

ill have to pull the plugs tomorrow if i get home before dark.

i did notice one thing diffrent, when i parked the car i smelt a burning smell, not like omg im on fire smell, but like a slight smell i dont know if it was the new plugs, it almost smelt like burning brakes.

also to make sure i done this right when i set the timing i set it to the 4th mark down is that right?

[Voltron240]

i was running factory boost, my avc-r was off i dont even have it set up yet.and to be honest with you i didnt even look at my temp gauge i was trying to feel what the car was doing.

ill have to pull the plugs tomorrow if i get home before dark.i did notice one thing diffrent, when i parked the car i smelt a burning smell, not like omg im on fire smell, but like a slight smell i dont know if it was the new plugs, it almost smelt like burning brakes.also to make sure i done this right when i set the timing i set it to the 4th mark down is that right?

The forth mark is 15 degrees. I am having the same problem. I just put my motor in, new plugs, new timing belt, new fuel pump, and last night checked for boost leaks. I have read on hear something about setting the tps I havet done that yet. Would this be causing our problems? I don't have an adjustable FPR and I noticed when I pull the vac line off and drive it it runs 100 percent better. But dumping fuel.

[leesredgt]

thats what im thinking maybe i dont have enough fuel going to it.

I have read on hear something about setting the tps I havet done that yet. Would this be causing our problems?

would this cause a problem? how do you set it?

[rb25drag]

If you lived a little closer to me I would just come over and have your car running good in about an hour.

Do you have a wideband?

Is it only doing this when your in boost?

If so it sounds to me like its blowing the spark out. Which could be caused by weak coils, I would try a smaller spark plug gap IMO. Also I would set it to 20 degree's timing.

To me it sounds like the motor was getting hotter than it needed to and the ECU was prob pulling timing out on you causing it to get worse the more you drove it.

[leesredgt]

i know i wish u lived closer to it would be so much easier.lol

no i dont have a wideband.

yeah it does great and its only at the beginning of boost itll drive then boost will hit and for like 2,000 rpm it falls on its face then after that, it pulls like a bat outta hell. and its that way in ever gear itll pull hard then ill shift and it goes to crap then itll pull hard to redline then repeat itself.

what gap do u recommend?

[rb25drag]

I would try .022 and try bumping your timing.

What MAF are you running?

Also did you fix ALL the boost leaks?

How far are you from Chattanooga?

[leesredgt]

im running the stock rb25det maf

yeah i do belive i fixed all the leaks.

im about 15-20 min from hamilton place mall, im pretty much live in ooltewah, im in mcdonald tenn.

[rb25drag]

Im working in collegedale LOL, I drive an hour n half every day to work.

If you can wait till next week We can hook up after I get off work and ill come take a look at it.

My number is 423-619-4842, Scott, Hit me up, Tuesday is my next free day.

Im working at the construction site of the new lifecare centers of america by litttle debbie parkway if you know were thats at.

[leesredgt]

yeah i know were thats at,im only like 5 min away from the little debbie thrith store and all that.

yeah man that would help me out alot, what time do you get off work?

i work in construction to, i build swimming pools with my dad so i dont ever really know what time i get off, the only time im off reall is if its raining like it did today.lol so maybe if i know what time you get off and if im home in enough time i could just give you a call if that would work for you.