OEM+

I have an 02 stock turbo, non x50, and occasionally it'll show .9 on the OBC. I know the internals are okay with that, but do I have to worry about it running lean at that boost level?

There is no tune, the car doesn't act funny, I don't get any warning lights, and it'll stay at .9 for a second or two, then bleed down to .8. I know .7 is normal, and I have no issue with it hitting .8, but is .9 something to worry about?

The realistic part of me is assuming that the computer knows what its doing and to just let it do its thing.

Thanks

dprantl

Nothing to worry about, it is normal.

Dan

Road King

When my non X50 car was bone stock it would hit and hold. 7 bar. .9 bar sounds awfully high for a bone stock car.

jeanmarcboilard

Could be the wastegates sticking a bit. You can exercise them from underneath the car or even check at what pressure they open with a Mityvac.

911mhawk

delete

OEM+

Wow...three different answers...

"02996ttx50

thats high. im also going with wastegate(s) possibly needing adjustment.

wross996tt

So you need to provide more info. What were the ambient conditions (how cold was it?). What altitude? What type of fuel? What gear did you see the spike in?

TMK, the stock K16s will produce 0.7 +/-0.1. A rare, random spike is not very meaningful.

Road King

No kidding.

I cannot cite documentation, but the consensus is that a stock well maintained non-X50 car will see .6 to .7 bar.

Macster

Based on my experience with my 2003 stock non X50 Turbo it could be normal.

Around "town" at close to sea level to approx. 500 feet above sea level under optimum conditions my 2003's boost can reach and maintain for a few seconds -- longer than if the reading were just a "glitch" or "spike" -- 0.7 bar of boost.

However, at higher elevations the boost has reached -- not spiked either -- 0.8 bar even 0.9 bar. The time I remember best was when I was driving in Wyoming on the freeway at around 8K feet above sea level. Even at 8K+ feet above sea level (albeit with 93 octane gasoline in tank rather than the 91 I have to run here in CA) the car accelerated like a scalded cat.

So if you tell me that under very hard -- pedal to the metal hard -- acceleration possibly up an incline and at some elevation the boost hits 0.8 bar even 0.9 bar and the engine doesn't manifest any untoward behavior and the CEL remains dark then I'm of the opinion that what you are seeing is normal.

But if you tell me that under less optimum conditions you see the boost level reach 0.8 bar or 0.9 bar and only for a brief time or the engine in some way acts up that's probably not normal.

Road King

Good point(s) Macster, I failed to state "@ Sea Level".

"02996ttx50

lol its deja vu all over again.

OEM+

Please elaborate?

"02996ttx50

sorry. we've had this thread and the same replies before lol.

Road King

at least we're consistent!