Thread: T-off to Wastegate broken on a Tdi, what Damage can be Done?

I fiddled with one of those a couple of days ago, the tee looks just fine. The barbs are short but adequate for the job. All you need is a new piece of rubber hose between the fitting and the waste gate, I imagine a piece of 1/4" fuel hose would suffice. You can easily unscrew the fitting from the turbo outlet to clean the broken bit of hose off the barb.

Originally Posted by bee utey

I fiddled with one of those a couple of days ago, the tee looks just fine. The barbs are short but adequate for the job. All you need is a new piece of rubber hose between the fitting and the waste gate, I imagine a piece of 1/4" fuel hose would suffice. You can easily unscrew the fitting from the turbo outlet to clean the broken bit of hose off the barb.

OK... cool, I hope u are right

Driving it for the next few days or so won't cause any problems ???

it just means your wastegate isnt opening so you're getting more boost.

more boost for the same fuel = lower egt...

On my tdi I'm only concerned when the boost gauge is past 30 and thats only because that means its on the stop so whatevers going in might be damaging the guage

Worry more about your EGT than the boost

Originally Posted by Blknight.aus

it just means your wastegate isnt opening so you're getting more boost.

more boost for the same fuel = lower egt...

On my tdi I'm only concerned when the boost gauge is past 30 and thats only because that means its on the stop so whatevers going in might be damaging the guage

Worry more about your EGT than the boost

Cheers for that, I wasn't aware of that.....
I was a bit concerned because I was actually thinking my EGT's were running a bit higher for the same sort of driving.....

rob

they shouldnt be unless you're using more pedal down lower to get it up to boost or if the extra boost is carrying too much heat through the intercooler raising your inlet air temp

Theres other factors that add more to the EGT I run 50 degrees cooler first thing in the morning going to work than I do coming home in the afternoon. which servo I hit for fuel if I use my own special blend of whatever the hell I can find windage

About the only damage that extra boost might do is blow out a weak intercooler hose. That happened to a mate of mine this afternoon after we raised the boost a bit.

Isn't anyone worried about turbo damage because of too much boost? Or is the stock turbo on tdi way more capable than boosts we are normally running?

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Rob, I think you are on the right path by avoiding too much boost. I would do as you suggest and stay at or below 20 psi, that's already 40% more than the makers recommendation. The Tdi is fairly conservatively tuned power wise, so there's some room for extra tuning and boost etc. From my reading it seems they are regularly tuned with boost up to 1.5 bar, about 22 psi without too much effect on reliability. The compression ratio is 19 to 1, so theoretically you have 38 atmospheres (abs), at top dead center from compression, at one bar boost.
At 1.5 bar boost you have 47 atmospheres, that's before the fuel is injected. It means your head and head gasket are under quite a bit more load. For reliability sake I would stay away from boost pressures over 1.5 bar. My VNT has the vane controls set for 1.5 bar as well. Occasionally it gets up there but I usually avoid it , I'm thinking of adjusting it back to 20 psi. cheers simmo