Originally Posted by EVO8_PR

Tial 44mm with the following springs ,a large red(10.15psi) and a small green(5.80psi) for a combined spring rate of 15.95psi
I do have a 2.5" o2 housing. Could it be adding enough backpressure to force the pressure inside the exhaust manifold to overcome the valve on the wastegate?

Originally Posted by awdboosted

I'm asuming your on a 35R with supporting mods.

You need to change the springs. A good rule of thumb is to multiply the base spring rate.. So 15.95 * 2 = 31.9 as a max boost. Anything above this will be unstable. Also are you using both ports? Top and bottom?? Do a boost leak test as well..

BTW.. I was able to get 35 psi to redline on a 30R. I didn't have enough fuel to support it so I had to turn it down.

Originally Posted by Aby@MIL.SPEC

you need to see what your turbo set-up requires.....depends on your boost level target, w/g preload, etc.

i prefer to have the duty map set up to where a higher number = more boost. this is easily configured by having "boost w/g invert" checked or not.

boost w/g output = yes

boost load = no

boost w/g invert = depends on wiring

boost w/g freq = 31hz

boost idle pw tps 25

boost duty max 90%
boost duty min 10%

fuel cut load = what ever you want it at

i suggest starting with a flat 20% boost w/g base duty map. do a 3rd gear pull....if boost ramps up above whats safe, get off the gas then change your boost w/g invert setting.

if boost is low, complete the pull. make the same map a flat 40%, note boost level. if everything is still safe, your getting more boost, then try a flat 60%....see your results in logged data. modify your map accordingly.

i use a boost target vs tps map. in order to see your target boost map in logged data, "boost fb" must be flagged on, then mae the limits 0.39 & -0.39. this allows you to see logged boost target in data. for now boost error maps, boost wg inp should be flat for now...

you can flag on "boost fb on error" if you want, as long as the able is flat....i prefer this boost control method vs having the system in complete feedback....in some situations live feedback was good, other times it wasnt.....

your call. first you need to develope a w/g duty map to geet you close to your desired boost profile by doing the arbitrary pulls utilizing flat duty maps....this will also teach you the sensitivity of the duty map relative to boost change @ various rpms.....

I found the best performance from the oem ebc needs to run a 0.040" jet before the "T" within the oem boost lines. this jet lives between the compressor housing & the "T". i left in the other oem lines, jets.....

have fun.

Originally Posted by awdboosted

I'm glad it's working for you. I never used the stock solenoid. But it's good to know it works. BTW the gm sensor is like 10 bux.. and the harness is 20 if you ever come to the dark side..

Originally Posted by althemean

from where?

I put the lines back to stock. The boost was way to inconsistent with that jet for me.