scottydouk

iTrader: (3)

As title, running a td05 20g at 1.5bar only in 5th gear on full throttle getting very bad boost surge as boost comes in hard (high pitch air pressure noise chattering from turbo area) how to over come this? Can drive through it if slowly accelerate.

Is it because too much air is being drawn through filter causing stalling of turbo? As not too sure.

Used to be fine, but only thing can remember changing since this happened was made the air intake from filter to turbo as free flowing as possible.

All help appreciated!

Billet

iTrader: (60)

The only cure i know of is to port the wastgate, however let some subaru guru tell you everybit

scottydouk

iTrader: (3)

Have just been doing more reading up on this and by the looks of things i need to restrcit/reduce the size of the intake pipe at one point and should help.

FB Tuning

iTrader: (30)

Simplest solution is to restrict the turbo inlet, to cure this.

Alternatively, if you've got vernier cam pulleys, you could experiment with inlet cam timing

f4la k

iTrader: (1)

Individual in gear boost settings, Dont know what car youve got, needs to have a mappable ecu..

tye

hi i have a wrx sti wagon 1996 same sort of problem, seem to get an uneven amount of power/ boost but i have no mods and only happens when in forth or fith gear over 4500 rpm. i can also go through it if i accelerate slowley do you know what this might be ive been told it could be plugs or coils many thanks

shepster

iTrader: (2)

Hi, like you have said above it is caused by running a larger intake pipe. I was told to stick with oem size hoses to avoid this problem. If you restrict it slightly you should be able to work it out.

ScoobyDoo69

iTrader: (17)

Would the restrictions restrict the power though?

STI_Baly

iTrader: (23)

This sounds like fuel cut to me (reaching the limits of the ECU;s fuel map) due to over boosting possibly due to dense air........completely different to what the OP has posted, Fiestaboy as usual has hit the nail on the head.

bigfarlz

iTrader: (9)

If it's fuel cut the car will feel like u hit a brick wall! Trust me it's happened to me! I gather it's like pulsing?

turbopanda

i have the same problem . the maf was naff, replaced it and now it works. the ecu has no idea what air /fuel ratio to do so it holds back to save the engine going boom.