what is the stock psi boost on the turbos on a '08 535i?

 

8psi

 

7-9psi depending on weather and elevation...

 

how high can you safely raise psi from stock psi without putting the turbo in danger of being damaged or is it not recommended?

 

what are you using to raise the boost?

as the boost goes up, timing and fuel pressures also needs to be controlled to prevent knock events or limp codes/over heating the turbos....

the jb+ which attaches to the tmap sensor, none of the mentioned controls above with it, raise boost to 10-13 psi IIRC.

with the jb3 and other ecu tunes, the boost has been noted to go as high as +17 psi IIRC on 335's (depending on maps, i think jb3 v2 has been reported to even hit 18 psi)

I think on on flashes (GIAC, ESS, etc..) boost has been logged on their S1's to be 13-15 psi's IIRC....

ecu and flashes are safer on the turbos as fuel pressures and timing is controlled better....

in terms of safety: Flash>piggyback IMO


***obviously with the higher psi's you'd like to have better bolt-on aftermarket parts to help such as an FMIC (not available for 535's), DP's, and better flowing exhaust systems...

***more info and research can be done/found on n54tech.com or e90posts: the FI section

 

Dinan which comes with a 50000 mile 48 month warranty maxes out at 13.0 from the stock 8.8 psi

 

forgot to include Dinan numbers

 

and the key one $2000 .....plus tax

 

how much does the dinan 13 psi cost and what hp increase is typical from it?

 

I'm pretty sure its 8.8 psi