Can someone help me with this. Is there a boost gage built in on stock turbo dashboard computer and if so can boost be easily adjusted? Will stock clutch handle the added torque. Do you know what factory boost setting is and what range of upgrade is acceptable. Thanks

 

page through the compute display.

you can set the upper and lower main display fields to display boost.

 

The onboard boost gauge reads in bar, not psi. On stock turbos, you should see 1.0 max. To raise boost, get a tune.

 

I thought stock boost on a Turbo was .7 BAR?

 

it is.

.9 = x50/gt2/tts

1.0 is usually a flash or high alt?

 

You're probably right. My bad. That's what the dealer told me when I asked about my tune.

 

do you know how high I can set the boost, what I would expect from that in terms of power/mileage, and what clutch can handle. I was told stock turbo motor can handle a lot more power but maybe not clutch.

 

Pics of said boost gauge please. And also we would need to know what tune you have and what turbos and supporting mods you have. Do NOT simply "turn it up" with out knowing these things.

 

If you search, you will see that tuned, 1.2-3 or so is about max on the stock turbos. My GIAC tune goes to 1.3.

 

It's complicated.

My best info (several sources) is the stock engine will develop 0.7 bar (though one source says 0.8 bar).

The complication is as one tech told me the DME attempts to satisfy the driver's torque demand and under some conditions this can have the boost going to 0.8 bar, or even 0.9 bar.

With my stock 03 Turbo I have seen 0.7 bar, but never over 0.7 bar, numerous times where I live and drive.

However, on road trips that take me into the mountains on I-40 in various states or on I-80 I have seen up to 0.9 bar on at least one stretch of I-80 in Wyoming at an elevation above 8K feet (and I might add running the sweetest 93 octane gas this side of heaven: can only get 91 octane here in Calif at least in my area).

These 0.8 and 0.9 bar boost events lasted long enough that I was satisfied they were real and not some aberration.

Other Turbo owners have reported seeing similar boost numbers from their stock Turbos at lower elevations than the over 7500K feet on I-40 west of Flagstaff or the over 8K feet in areas of Wyoming (I can't recall exactly where I encountered these higher elevations on I-80 but I think they were before I spotted Deer Mountain which is located between Rawlings and Chyenne south of I-80.)

Around where I live and drive I seldom get over 1000 feet above sea level, but others who live for instance in southern CA and drive some of the mountain roads in the 'LA area' have reported seeing higher than 0.7 bar boost and for more than just a flash in the pan time, so it is not just my car nor where I drive.

Sincerely,

Macster.

 

Very interesting. So, that would mean the DME adjust for lower oxygen levels at higher elevations? That's pretty cool if it does that. Normally it would be the same boost but less power due to thinner air.

I'll have a look when I blast through the local hills

 

My sources at SACHS say 525 ft/lbs is the max torque a factory 996 Turbo clutch can handle.

 

So, what's up with people replacing their clutches at 40-50k mi?? You'd think it would hold up plenty long with only 400ft/lbs.

 

Drag racing, slipping the clutch excessively, etc. takes a toll on the longevity on any stock clutch.

 

The stock clutch can't handle the power of the X50 package IMHO. Mine went out at just over 50k miles. I don't drag of slip it a lot having grown up driving tractors on a farm since I was 12. Whenever I'd try and push the car the clutch would quickly develop a burned smell if rev matching wasn't EXACT.

As for boost levels my X50 developed 1.0 bar pretty consistently at the top end of 3rd gear (and otherwise) which is above what it's supposed to do at 0.9. There have been no explanations offered by any experts on why other than it just happens my car will boost higher than expected. I now have a high altitude EPL tune street-tuned for the car (with a bunch of other mods you can see in my build thread in my sig) and I consistently make 1.1 bar but have never seen any higher.