alright guys i have a SS auto chrome 3" turbo back, no boost controller, a 2.5" 70 deg aluminum pipe for turbo inlet duct, 2.5" black intercooler pipe, 27x12x3" FMIC, tial BOV,ACT xtss clutch. Doing some data loging with my microtech and laptop before i replaced the turbo inlet duct i was peaking/spikeing to 14PSI now im hitting 19 psi. between 3600-4900 rpms. That is also what looks to bethe peak boost and it holds a steddy 14-16 psi but hits 17,18,and 19 pretty consistant, air temps at 23c to 31c incressing with rev, water temp goes from 84-86.

Now im haveing two problems the first is a sound like a clutch slipping or BOV leaking weird higher pitch noise or a major amount of air going through a small pipe just under high loads. im guessing that is the turbo overspooling.

the other is a coolant temp problem it will climb on warmer days should i blame it on the brass non turbo radiator being blocked by large Front mount. LOL

 

OEM thermostat?

HOLY **** YOU ARE HITTING 19PSI ON THE STOCK TURBO!!?!?!?!?!?!?!??!?!?
that needs to be tuned down a bit! They don't produce anymore power after 11-12psi, and you are WAY exceeding those limits. Is your wastegate ported? I would definitely blame the whining high pitched air sounds to the fact that you are pushing stock parts waaaaayyyy past their limits!

 

yah thats crazy 19 psi definetly needs to be toned down

 

Believe it or not, I think you need to check for boost leaks.

 

180f thermostat

i would turn the boost down if i could i do need to port the wastgate bad just not much time between trying to find a good job, but i want a new turbo just cant find any bolt ons besides BNR. and dont know too much about the external wastegates and bolt/v-band trying to learn.

whats the best way to look for boost leaks soapy water?

 

I use this boost leak tester http://www.boostpro.net/prodtester.html along with soapy water. A guy on here named NZconvertible made his own tester. In my experience, the more boostleaks you have, the more you get that badass whooosh sound as the turbo is spooling (this is assuming you actually have an air filter on the turbo).

 

thats something new or i haven't seen at least!

 

And I can't even make 1 psi right now. But what can I expect with 220k+ original cats and exhaust.

You'd better stay off the throttle.

 

lol everyone says turn it down.. i say **** it.. blow your turbo.. you'll probably blow your motor at that rate too
but you only live once..

so Go and push it to the limit


LOL

 

seeei posted a thread about this before!!! Stock turbo has potential!

 

I own my first turbo and get that whooosh sound when boost pressure builds, I'm going to have to read up on boost leak.

I've got a stock S5 JDM 13B turbo, except for a 3" Racing Beat exhaust with a presilencer, FCD, and a custom intake that's about 3-4" diameter. If I stomp on the gas I will get about 12 psi. I tend to take it easy on the car though, as it's a work in progress. I need to upgrade my fuel system, add a wideband, and some sort of engine managment. I'm leaning towards Megasquirt.

 

potential to blow up!

 

Something is wrong.
The stock turbo should not be able to boost that high with that big FMIC.
Does your boost who "0"with the engine off?


-Ted

 

the boost gauge reads 2-3 hg but the laoptop reads 0 when the engine is not running. how do i turn down the boost with no boost controller?

 

Boost controllers don't turn down boost, they only raise it. You need to port your wastegate to better control the boost.

 

you sir, need to check and/or port your wastegate...if you haven't already...

 

i guess im porting this week, this sucks!

 

Alright, i ordered a JVT Racing radiator and some other stupid parts. JVTR said i was the first person to order it other than dealers, also ordered some carbide griding bits for the wastegate. I will let you all know about my test it should work out.

 

I agree on the WG port, but if you have an S4 just porting to the WG flapper isnt enough, search for the write up on porting using the washer welded to the original flapper arm. I crept to 17 psi on the highway, it only took a second and my motor is now in boxes, trust me on this.

 

19 psi .. rofl

 

Hope your not using stock injectors and pump.

 

Theres not much stock on the motor s4/s5/s6 (i dubbed Frankinrotor) motor s4 front cover/omp s5 housings/turbo/lim s6 internals and uim1000 sencondarys 550 primarys walbro 255 high pressure at anything above 12psi the a/fr 10.9-10.0.

 

your waste gate actuator is stuck, broke, or not seeing any boost.

 

+2

19psi is like having a welded wastegate and let it spool for all it's worth.