Nico911

Hi again.

I have a pretty simple question : what is the normal maximum boost level we should get from a non X50 TT ?

rmc1148

If stock around .7-.8 may peak at .9 in cool weather.

Nico911

Damn, I wonder how I got a 1.4 in second gear 2 days ago... Hope there's nothing wrong with the engine.

"02996ttx50

there wouldn't be if you had a modded ( turbo's etc ) car with at least a 1.2 bar tune.. with probable wastegate issues

if not? there could well be issues ahead if you continue to "test" and visit that boost level however briefly. i hit 1.3 regularly but have a 1.2 ( it's actually technically a 1.1.5! ) tune, with hybrid turbos etc. so thats where it comfortably "lives".

do you know of any mods to your car? if not i'd be a "bit" concerned.

LexVan

On pump (93-94 octane) gas?

And there's still snow on the ground in Montreal.

Nico911

Car is stock and I run on 91 octane gas. I wonder if the indicator in the dash can have a false reading. It seems pretty impossible for what I know. It's funny 'cause I either see values like 0.1 or 0.3, or 1.something...

I'll have the car for another issue in a few days in a repair shop so I added this on the shopping list.

mcbit

When I had low voltage issues due to a bad earth strap mine used to go from 0.3 bar to 1.1 bar with nothing in between. Since that issue has been solved I get a nice smooth progression up to a sustained 1.1 bar. The only time that I've seen more (1.3 bar spike) was when I had to do a full lift off the throttle whilst accelerating a 6000 rpm in third.

Dock

Is your engine/ECU stock?

mcbit

Nope, I have a 1.1 bar map and hybrids.

Dock

Cool, as long as the OP realizes the difference between modified and stock boost (I realize you were probably just illustrating the benefit of fixing the bad earth strap, but obviously 1.1 bar isn't anything he is going to see in his stock Turbo).

mcbit

No, correct, I was just trying to quantify the zero to hero boost issue in my own context. At the same time I was also seeing 1 bar oil pressure at idle and 2.5 bar at 2500 rpm. I now see 2.1 bar at idle and 4.2 bar at 2500 rpm. I was getting nothing accurate until the voltage went above 13.2V. I think what I was seeing was a low boost reading at lower revs and the boost gauge suddenly becoming accurate at about 5000 rpm as the voltage scraped past 13.2V.

Dock

Very good information.

Smoltz

Since you just bought you car, the most likely explanation for the amount of boost you're seeing is that your has been chipped and is not stock as you believe it to be.

Nico911

I would be very surprised, I bought the car from it's original owner and I have all maintenance record. I also asked him twice if the car was 100% stock, told me yes both times.

jeffmeunier

I've noticed similar things on mine and have wondered if I have an un-recorded upgrade. Didn't show up in a pretty good PPI, only some aftermarket diverter valves. Any way to tell DIY using Durametric, or is sleuthing this out only possible with a mechanic or tuner?