I'm in need of some advice, I'm unsure where else to ask these questions, and I know the Greddy guru's on here sure know their stuff
I'm running EMU with 460cc injectors (supposedly), no AFM (removed using Joe Perez's airflow output map).
I've recently been trying to get the boost to stabilise at 15 psi without boost overshoot. If I set the manual boost controller to 13 psi, at WOT it will overshoot to 15 psi then after about a second or 2, drop to 13 psi.
If I set the boost to 14.5 psi, it will overshoot to just over 16 psi and then drop back down after a second or two. This is where its set at now.
I read somewhere that 15 psi is the limit for this turbo, but there is quite a bit more power to be had above that level - a rather noticable difference between 15 psi and 17 psi
It appears that the actuator isn't fully opening the wastegate, literally as though the piston weren't moving the wastegate much as it is meant to swing (lots of extra play). Is this normal?
Can I upgrade the actuator somehow?
I'm considering upgrading to some form of electronic boost control, will this solve the overshoot problem mentioned above?
The afr's are in the high 11's @16 psi, no knock. I've tuned the EMU up to 17 psi (was 16 psi) to ensure no lean conditions or knocking occurs with overshoot. So if push comes to shove, I can live with the overshoot.
The factory 1.6 engine and turbo seem
to handle this fine, so far at least.
Also, any idea on how this boost level will affect the turbo long term?
Its only a Greddy TDO4H-15G, so if it goes pop it won't cost much to replace.
I can post datalogs of the AFR's & boost levels if it helps.
Sorry for all the questions at once, but any advice at all would be very much appreciated.