Stage 1 boost has returned to stock levels

[PTGT Redman]

I have s1 and have never seen more than 13lbs boost. Oddly, and if anyone can help me with this, whenever at WOT and i am pushing past 4500rpm, esp in 2nd gear, i hear the turbo but then this other brief whining sound. I don't feel comfortable with this sound and am unsure if i should hear it. This occured before s1 as well. I am pretty sure i couldn't get near 6000rpm even if i tried.
And i haven't had the experience of spinning the front tires...honestly...

[hyracer]

Culprat,
That's O.K. man, no hard feelings here.

PTGT Redman,
How hard are you stepping on the throttle? You won't achieve full boost without having it floored. On my 5-spd. I can easily spin in first even with a rolling start. At the dragstrip, power-shifting, the tires spun in first and second and at least two runs they chirped in third. Stage 2 will definetly require slicks to get the power to the pavement.

[Ptturbine]

Culprat, You are wrong about the boost to redline. You CAN NOT attain those boost levels without doing something physical to the gate(spring). You must have made a wrong turn somewhere...Good luck.....
Are you sure you are not just getting used to the power? Mine makes over 300HP at the wheels and some days it feels a little slow or sluggish...

[mnptgt]

I'm thinking it's something simple, like a bad load of gas. Mileage wouldn't be affected much. I'd throw some seafoam in the tank when it's close to empty and make sure the wife is buying premium (preferrably non-oxygenated) fuel.

[Dalite]

All, please keep in mind that boost gauges are relative output devices. Depending on the pick-up point, and the actual gauge calibration, boost figures will probably vary from installation to installation. With this in mind, each person's view of max boost is accurate; in their situation.

If the boost gauge showed 25 psi originally, and only shows 20psi now; something has changed - no matter what the accuracy figure is. (just random figures to stress a point)

Also keep in mind that the goal of the PCM (at least the original PCM programming) is to manage boost to provide torque in relationship to throttle position. Lower ambient temps would possibly result in lower boost figures, but the torque should be the same.

I have experienced the same loss of perceived power. I was just hoping that it was a result of my having become accustomed to the Stage I.

When I first installed it, it would spin tires starting at 3500, with over 575 pounds of "spectators" occupying the seats. Now, it won't achieve the same results with my 180 pound dead weight pushing the controls. Second gear chirps are fading fast also. I have the 5 speed..

Another possibility is that the squeak is rapidly leaving the tires as a result of wear, and the temperature of the roadway may also affect adhesion. I don't know the answer to these question; just throwing it out there.



It is all relative...

[3BarBoost]

I just passed 6k miles with S1 - and it feels like it could be faster (not satisfied with 14.48). I have a thought, though. You can achieve something like the spring mod by "bending" the wastegate actuator a little (less than 1/8") and preloading the spring inside (bend it away from the acuator rod) - use a big screwdriver and pry the whole thing, the bracket will bend. It's conceivable that the cans are annealing a little bit and/or the manifolds are doing the same and moving some due to the wastegate spring pulling on them. This is nothing new to you old hat turbo types (can crushing achieves the same thing), but it's worth a shot.

It's free, and could find some get-up-and-go if the can/manifold relationship has moved. However, something like this is unlikely to happen overnight - so not sure if this helps Culprat or not.

[Culprat]

3BarBoost,
Why do something like that,when it is only a bandade?
what I want is the answer to my question,what as gone wrong?
Is it software or my system.

[3BarBoost]

I really don't think it's software. If you bend the can, and everything is back where it was - then I'm right (and should theoretically permanently fix your issue), if I'm wrong no harm done. Anything software-related should either set a code or be resettable with a battery disconnect - other software glitches would be intermittant at worst rather than a step change like you seem to have experienced.

FYI - I ran my car this weekend, was just as fast as before - so my ass-o-meter isn't the greatest.

[Dalite]

Here is a benchmark.

Using regulated air pressure, slowly apply from 0 to 10 psi to the Wastegate Acuator while observing the Wastegate Actuator Arm. It should extend approximately 1/2 to 3/4 inches as air is applied. If not, Diag manual calls for turbo replacement. (this from the diag manual referencing P0234/P1188/P1106 error)

My comment - if the actuator arm movement is less than 1/2", then try bending the bracket to restore it to between 1/2" and 3/4" at 10 PSI.

If this route is taken, be sure to use a LOW pressure source with a good regulator.

A good point of further discussion may be where could the average guy find a good source of regulated low pressure air?

[Culprat]

Dalite,

Thanks I will check it in the mouring.