MattB

simple as that

mods are in sig...i dont want to over boost and blow my motor. i want to keep my boost around 9 PSI but with my exhaust and intake im getting much higher...around 12. what are some ways you guys have lowered your boost. i need to port my wastegate, and get a softer wastegate spring...i know that but what else can i do?

Thanks,
-Matt

SureShot

The main restriction is the waste gate port.

Your current waste gate is already wide open at <8PSI.

YearsOfDecay

Softer wastegate spring aint gonna do squat.. Its already at 5-6 Lbs...

with a full three inch exhaust.. you really need to port that wastegate out to 35MM.. Or pay Bryan at BNR for a stage III or 4 that includes the bigger wastegate.

MattB

ok well i have an S4 so i think its already wide open at 5.5 or something...S5 is 8...im pretty sure.

but anyways im really poor and have very little time to work on my car. im going to have my FCD done pretty soon but since i can boost higher i dont wanna blow up my car.

i have stock ECU and injectors and i dont wanna lean out too much. i need to restrict something so that my boost cant get above say 9 PSI. im gonna try taking some sheet metal and shaping it to my K&N and putting it around it after drilling a few small holes. im hoping that will restrict my boost enough until i can get RTEK and injectors...im only looking to make 230-250whp so i dont think im gonna go haltech or any of those.

ive just been so poor lately and i go to school from 7AM to 2PM then i work from 3PM to 7PM and it doesnt give me much time to work on my car. so i need a quick solution until i have time and money...

Jturbo

iTrader: (9)

The only thing besides porting your wastegate bigger is to put your main cat back on your car. You may also need to put your stock air box back on the car. One of my first mods was a 3 inch downpipe and a drop in K&N filter. I was okay in warmer temps but when it got cooler out I was hitting fuel cut in 1st gear with no problem. This was with a stock wastegate and just a filter and a down pipe. I would say not to use the fuel cut defencer untill you have proper fuel mods.

MattB

i dont have the stock airbox, or the stock cat. all i have is the K&N filter...not full intake...its a stock TID, and the full 3 inch exhaust. i am so poor now since school started and i only work half the hours i did over the summer. i pay 400 a month between car payments, and insurance, then gas...so what im trying to ask is...can i restrict my intake enough to get only 9 PSI or so...? i need to not blow up my car basically, and fuel cut is getting annoying.

sleeperfc

better stop hitting fuel cut if your broke. rebuilds are costly.

i know someone local that used a coffee filter over the inlet of the turbo to restrict flow and lower thier boost.

the only problem is it would sometimes suck the stock tmic elbows flat under high vaccume and choak the motor. it wokred tho.

very ghetto

MattB

im gonna try to make it look half decent...as ghetto as it may be...

also, i went to hook up my boost gauge, and i was looking on FC3S.org cause they have a little writeup on it and the line they use to go to the boost gauge goes to my stock BOV, and the line below and the right a little goes to my pressure sensor. ill get a picture of it later but



that line goes to my stock BOV, and there is another line that goes to my pressure sensor. i would think i would use the line that goes to my pressure sensor to hook up to the boost gauge...maybe my lines are mixed up? kinda weird but im just wondering

sleeperfc

if your hitting fuel cut thn you need to either mod the car to handle the boost... or put the stock stuff back on.

to go from a stock setup to modded there are a few thing your need to do all at once to avoid problems.

if you get an exhaust and intake the you need to

port the WG. and get a:
walbro
FCD
safc and at least a set to 680s for secondarys.

or
walbro
the rtek 1.7 and a pair of 720s for the secondarys.



but the WG needs to be ported. if you cant do that then put the car back to stock till you can.

MattB

well i have a walbro i can put in, but im too poor to upgrade anymore, and i dont have the stock stuff anymore.

the only reason i upgraded to 3 inch was because my stock exhaust leaked like mad, and it was cheaper to upgrade then to go back to stock.

im not looking for an improvement in performance right now, i just want my daily drive to work without this little "quirk" and i need a quick solution.

trust me, if i could afford it i would have rtek and injectors in right now, but im 17, a senior in high school, working 20 hours a week at 10 bucks an hour and i pay for myself completely except for housing, and some food...

sorry to seem angry im just getting frustrated cause i dont have time to fix my car lately but i dont want to blow it up

torean

get a boost gauge.....when boost rises to 8psi...back off from the throttle....its as simple as that..until u save up enough to buy more stuff

MattB

im putting in my boost gauge and fuel pump next weekend...then im just gonna have to find the self control to keep off the throttle...ITS SO HARD. oh well...

X-JaVeN-X

well here's a fix...don't push the pedal down so far, May not be the fun solution, but you won't blow your motor. WHEN YOU HAVE ENOUGH MONEY/TIME, then mod the car correctly and there ya go.

masao

Yeah, just stay off the go pedal.

RETed

Restrict the intake or restrict the exhaust...

Run a smaller intake filter...easy enough if you're running some kinda cone filter.

Put a 2" restrictor plate in the exhaust system.
Running the RB 3" full turbo exhaust system, we put a 2.0" restrictor between the downpipe and pre-silencer, and boost dropped from an uncontrollable 13psi+ to a stable 10psi.


-Ted

MattB

thank you ted...finally an answer i was looking for...some proven results. everyone else was just here to flame me and tell me i should do things right...WELL I WANNA DO THINGS GHETTO! haha no i just dont have money and i was gonna try these things but was a little unsure. so is the exhaust restrictor plate just a piece of steal with a 2 inch hole? i guess ill just buy some flat steel stock and drill a hole and put in in between the flange with some gaskets...?

as for the intake...can i just rig some piece of sheet metal inside the filter with a small hole in the middle that lines up with the MAF?

NOPR

wouldnt getting an s5 turbo/manifold help?

MattB

i have an S5 Turbo/Manifold sitting in my garage...

will it bolt on to my S4 block?

MattB

hell i have a whole S5 motor...why dont i just drop that in while im at it....

RETed

That is correct.
We just took some thin sheet steel laying around the shop and punched a 2" hole in it.
Then we drilled two holes for the bolts through the flange.
We just used some RTV to seal it up, and that was it.


Yes, you could do that also, but it's a little bit trickier since it takes some creativity to mount the sheet metal inside the filter?
Hmmm...maybe before the AFM, since it used 4 bolts to secure to the air box?
Are you using a cone filter with an adapter?
That should work also.

Good luck!

Side note on the filter...
I found this out by accident, since I used to run a TINY K&N cone filter smaller than a can of soda.
I used to boost to only 9psi max, stable.
I then got a generic 3" ID cone filter that was like 4 times are large - my boost shot up to 12psi to 14psi instantly!


-Ted

slpin

iTrader: (9)

^^^

now do you guys know why i use my tiny k&n filter?

NZConvertible

And you're asking how to lower boost?! Dude, stop pissing around with power-killing restrictor plates and get that turbo on. You should still port the S5 wastegate before you put it on, but you'll be starting from a much better base with regards to boost control, plus you'll have a faster responding turbo.

Yes, it's a direct swap using the S4 oil and water lines.