I have a small M90 on my 2010 auto...with 5.8 psi..and also LT's and catted H, 62mm tb. 94 tune. It pulls like a MoFo. My wife would never now there was a PD blower installed. I can easily wind it up to 6 krpm in 2nd or 3rd gear....and still not be into boost. You really have to have ur foot into it pretty deep b4 the boost comes on. Even then, I can easily feather the gas pedal, so I have say 1-2 psi boost, or any amount I want. Tell your tuner you want a normal throttle response, no light switch effect. They can change the throttle response via the throttle mapping. Some tuners will do the light switch throttle nonsense ...esp on NA cars... to provide the illusion of..'more power'.
The 5r55s is pos to begin with. I have 386 rwhp / 370 rwtq (482hp /462 tq at the crank). If it was a manual, it would be an easy 425 rwhp. As is, I had to install a 2nd auto tranny cooler in series with the oem tranny cooler. Then the deeper tranny pan (holds an extra 4 qts), which also came with a locking style dipstick) and drain plug on pan. Replaced oem atf with synthetic. Still not done. A jdm engineering catch can for the auto tranny also installed, otherwise you will puke out atf all over the road. The oem setup has no dipstick, so u have no easy way to check level... or add to it. Without the B+M auto tranny cooler, the tranny temps would rise from 170-200 F in just a few secs.
The 5r55s auto tranny is marginal to begin with, don't push it. Avoid stuff like a 5-3 or 5-2, or 4-2 downshift. It's the downshifts that trash stuff. Shut the OD off if ur gonna hot rod. The tune for the auto has to be carefully done..or it will not last. Shifts have to be firmer + faster with the blower engaged.
