I tried to tune my car using ecu flash yesterday (for the first time) and my manual boost gauge reads spikes to about 17psi , evoscan logs the boost spikes up to 47 psi. I can't get the actual boost above 17psi and it tapers to 13 psi by redline help???

 

In order to log boost values on a USDM Evo, you have to swap the stock MAP sensor with the JDM unit. Mrfred can provide you with one ... some also say that the new Evo X has the same unit stock, so you may be able to source them from Mitsu now.

about controlling your boost ... you have to physically modify the stock boost control system to increase your boost. You can do this by removing one of the stock restrictor pills, changing a different pill or installing a bleeder in line with the wastegate actuator line. You can also change the boost control solenoid itself. It can be replaced with a GM unit or another aftermarket unit such as Perrin.

After you've made modifications, you can then tune your boost using ECUFlash.

 

1st: evoscan can't read boost unless u install a map sensor
2nd: how did u tune boost?? remember wgdc can go as high as 127.5, not just 100.

even if u put wgdc to 127.5, u won't be able to get high boost.

There a lot of things u can do, the easiest would be to install a smaller pill in the hose coming out of the turbo to the wg and solenoid...

https://www.evolutionm.net/forums/sh...d.php?t=288408
for fine tuning...

 

https://www.evolutionm.net/forums/sh...d.php?t=227006

this is how u replace yr pill with a smaller one

 

but shouldn't I be able to get to at least stock boost levels , I am recording boost from evo scan which I guess is using the afm and map to get the boost levels the ecu sees

 

EvoScan is set up to log boost from the JDM MAP sensor. The ECU does not reference boost in it's stock form. It runs solely from Load%.

 

that's correct. if u want a good estimation of your boost using ecuflash, then use the 2-byte load mode, then log your load...

your load - 100 / 100 will give you your boost in "bar". Multiply the result by 14.5 to get it in psi...


that's only an estimation...

 

Wrong. The table does go to 127, but the ECU can never see more then 100

 

so if you change the load values will my ecu see less boost and allow my boost to go higher??

 

???

I suggest you read my threads on controlling boost using the ECU.

 

i know wgdc will never go more than 100% (of course), but 127.5 is equivalent to 100%, that's what i know...

 

yeah, so why waste time and put 127 in the box if its really 100???

 

it is not imo, 127 = 100, whereas 100 = 100/1.27 if you see what i mean...

 

umm ok whatever??

 

Actually, that's not correct. Putting anything more than 100 in the table will not get you any more WGDC. ECUFlash allows the user to put values up to 127, but the code in the ROM clips all values over 100.

The limit in the ROM can be raised to 127, but neither myself nor anyone else has bothered to publish the definitions yet. One possibility is that going to value much higher than 100 might cause the BCS to overheat.