sanyata

Had to have the car smogged today. I have an UMW flash and Europipe Stage 2 Load Exhaust. The cars has to be run at an increased rpm between 2250 and 2750 for a full 30 seconds to get the required readings. Damned thing would get within range and then start spooling up! Over and over again! Ha Ha !!!! It'd pop over the rpm limit within 10 seconds or so..... what a great problem to have eh? It took us about 40 minutes before one of the techs had just the right Fonzie touch and kept it within range down low around 2300 for 30 seconds. We were high fivin' ! Gotta love these turbos spooling down low like this... except on smog day. heh heh heh

fly2low

nice problem

PAULUNM

Were they running the test on the dyno? Are you still AWD?

Macster

When my 03 Turbo gets smogged the tech does it off the rollers.

Sincerely,

Macster.

PAULUNM

And they're supposed to with any AWD car. Which is my point.

Not sure how you'd start hitting any boost if you're not on the rollers.

John 996 TT Cab

In British Columbia they test the 996 TT off the rollers. The whole testing situation is going away anyway up here in next year or two.

ca993twin

Sanyata,

The question about your car being tested on the dyno rollers is critical. If they did that, you can kiss your viscous coupler goodbye.

sanyata

No rollers, wouldn't allow that to happen. Boost is generated by exhaust so it is understandable why it would start spooling up as they were running free without a load resistance. If it had been on rollers then the rpm's could have been controlled because there would have been a load on the engine. By not having a load the turbos were free to spool up, IMO. I'm certainly not complaining just reporting how low these start spooling which I love.

uschoice

Wish they'd do that here too. Just another expense we get stuck with.

Macster

Oh, sorry missed your point.

Sincerely,

Macster.

slant911

They actually do a road test like that? Yikes......they just plug into the OBD port here and check for any tripped codes. Done in like 20 seconds.....

SSST

I'm missing something. If the car is in neutral and you are trying to hold the engine in a certain RPM range, why would turbos and a tune affect that?

I don't have K24's, but I have a UMW tune and I can easily hold it at any rpm in neutral. Even though the turbos are spinning, it shouldn't be providing any boost unless the engine load calls for it. I can't even make my boost guage register a .1 in neutral.

It sounds to me like something else is going on with the car.

sanyata

Really, you've actually sat in your car and purposely ran it up to 2500-2700 rpms and held it there for 30 seconds in neutral? Why would you do that? I'm not sure about the boost without a load on the engine but tomorrow I'm planning on doing an oil change so after I've properly warmed it up I'll run up my rpm's and see if there is any boost showing without a load and being in neutral. If there isn't any boost then I most definitely have some other problem that I haven't thought of. I just theorized that it was my turbos wanting to spool up at those low rpm's and was happy they were kicking in so early....

SSST

I tried it yesterday morning after I read your post. No problem at all.

sanyata

SSST ~ You're right! I tried holding my rpms steady at 2400 - 2800 again. Although it still won't hold steady rpms in that range and climbs right up to 3100 or so, I never saw any boost. So the mechanic and I made the wrong assumption that the turbos were causing the problem which I attributed to the flash allowing them to spool earlier. I do get boost down low like that when I have a load on it when driving. It is not as erratic when the A/C is turned off but there is no way I can just run up the engine to any rpm between 2400 and 2800 and hold it. I can get 0.1 - 0.2 boost revving it up around 3800 - 4200. I've got a Durametric so I'm going to hook that up and see if it tells me anything. Pretty strange as the car runs fine, no codes or hiccups, just won't hold a steady rpm in that range while in neutral.
Any ideas would be welcome!