rrx777

ok, the car would not accelerate under boost? it is on the stock tmic and turbo. It normaly boost around 11 psi but when I was doing some test. I notticed it would boost under very little throttle, and then shot all the way up to 15psi! but the car still would barely move. the turbo is makeing a horrible sound almost like siren? I thought the motor was blown but I had a comp test done at mazda and every thing was fine any ideas, could the waste gate cause the high boost but no go?

Madrx7racer

a blown turbo??? I would not boost over 12 psi on a stock fuel system....you're asking for the motor to blow. Glad it didn't when you hit 15 psi...get another Stock or aftermarket (BNR TURBO is my favorite) and make sure the wastegate is ported.

TwistedRotors

iTrader: (3)

I do believe your turbo is shot. That sound is likely the compressor or turbine coming into contact with the housing.
-John

rrx777

well i checkd the turbo. spun the wheel with my finger and there was no sound at all and it dident drag? any thing else to look at?

PastelliFC

Its a turbo, same exact thing happened to my old tii

gergrx7

check for vaccum/boost leaks.

RotaryEvolution

iTrader: (30)

try pushing in on and then pulling out on the turbo shaft.

KompressorLOgic

iTrader: (6)

yeah when my turbo was going it was making siren noises when it spools and despools.sign its shot.

what mods do u have??? ill assume you have an aftermarket boost gauge right??
what else do u have?

ilike2eatricers

Do you actually build boost? Are you verifying this with an aftermarket boost gauge?

mr_vaughn

iTrader: (1)

check all your piping from turbo to IC and IC to TB.
May have a cracked hose. which only opens up wn under boost.

RETed

1) Check to see if your leadings are firing.

2) Make sure your trailings are NOT backwards!


-Ted

rrx777

well i checked for leaks found none, and the after maket gague is showing boost but since it started makeing the sound and running like crap I havent let it go over 2 or 3 psi.Im gonna check the ignition next the car has na trailing and leading packs so maybe thats it. reason I thought it was the waste gate is that the car has never boosted past 11psi then when the problem started it shot to 15psi under very lite throttle.

SonicRaT

iTrader: (6)

Coil packs are the same. Take your inlet duct off, grab the turbo shaft and see if you can move it around at all.

RETed

The NA coil packs are the same, as SonicRaT mentioned.
But PLEASE check the leading spark to see if it's firing.
When the leadings don't fire, it's like running retarded (pulled-back) ignition timing; the engine will make all kinds of boost, but there will be little power.


-Ted

tIIsleeper

it sounds like there isnt any oil getting to the turbo