Just wondering how many people do...This 89 T2 cant seem to do it Any ideas why? I was thinking a weak wastegate or something...I guess a leak somewhere in the intake tract could cause it, but i really doubt that. So what can be done to remedy this?

Thanks

 

Mine does now, but it wouldn't with a stock turbo.

 

lol well thats a little farther down the road

But knowing Im not the only one makes me feel better

 

Whats your exhaust and intake set-up? TID and open exhaust made my boost go up near redline on my S4. Maybe it was all the hot air from overworked turbo though, he he

 

I am also unable to hold max boost up to -or near- redline...

The best I can do is slowly build boost until it hits 420-430mmHg up to 4K-4.5K rpm (thats about 8.5-8.6 psi), then just see my boost fall to 300mmHg as I reach redline...

If I just WOT from the word "Go", I hit max boost instantly, but then the boost bleeding is much more evident....and "painful" . Of course the situation was vastly worse before my new catback....and I suppose it will be even better after TID/DP...

 

That's pretty normal behaviour for a stock turbo on any car. Manufacturers select turbos that provide their best performance in the mid-range. It makes them better all-round street cars. This is why we modify them!

 

This is for ACE, hey, what kind of exhaust do you have, is it stock and do you have cats?

Thanks

 

Custom 2,5" dual catback (I essentially ditched the Y-pipe and the muffler with free flowing ones).

Stock pre-cat and cat still in place. Not for long though (at least the pre-cat...) Also the main cat is a bit "lighter" and more "free flowing", cause there are big bits missing The car is still 100% legal though...

The way I figure it, even if DP gives me 1psi, and the TID another 1psi (absolute minimum values), I'll be looking at 10-10,5psi easily Got to watch out for that fuel now....

 

RB Turboback and K&N cone filter

 

TID mod helped me in upper rpms alot. Turbo doesn't have to try hard to draw the air in through the convoluted s curve intake. If that doesn't help, check the exhaust turbine for damage? I don't know on S5. Mine was S4 and crept at high rpm. Stock boost levels dropping off? or a boost level raised w/ aftermarket boost controler?

 

No boost controller...just the extra psi from the exhaust. Oh well...Itll be getting an aftermarket turbo sometime ( far ) down the road...I guess there is no need to worry now. Even with dropping boost, itll still turn ~13.5

 

it's common with stock turbo. mine will hold 8psi at redline now with the TID and intake though.