Need Help Guys...

[IMPORTD]

After what we thought was a stuffed AFM, we found the Pod intake pipe was loose.

all tightened up, now the boost is surging and it hits max boost (around 10psi) with little spooling...

The surging feels as if the car is idling high, then low... but its the boost.

I have the manual for the controller but I really don't understand the terminology..

Start Boost

Set Boost

Set Gain

I've searched the forums and read posts after posts, but I still struggle to understand what is best to set it at...

I'd just like some 'safe' settings to input and be done with it, as when I eventually sell the car, the controller is going in the leggy.

I know there are a few of you on here that have this EBC and was hoping you could tell me exactly what to set the 'start boost' at etc etc..

Thanks

Kylie

[Kaido_RR]

here some information that might be helpful

SET This is how you set the boost pressure. Rather than setting it in psi or kPa, the Greddy unit allows you to adjust it as a percentage value, from 0% (greddy unit essentially turned off) to 100% (greddy unit will set the boost as high as it can). This setup demands a certain amount of trial-and-error to properly configure it since you have to make adjustments, then drive under WOT (Wide Open Throttle) and see what the maximum boost pressure achieved was throughout the entire RPM range. SET SHOULD BE SET TO A CONSERVATIVE VALUE WHEN BEGINNING TO TUNE YOUR GREDDY UNIT. 30% SEEMS TO BE A CONSERVATIVE SETTING BASED ON MY TESTING AND BASED ON OTHER REPORTED NUMBERS FROM EVO OWNERS AND TAKING INTO CONSIDERATION THE LINK BETWEEN SET AND GAIN (see GAIN below).

GAIN is defined in the manual as the value to adjust the "boost consistency". You don't really need to know exactly what that means. You should set GAIN to 0 when beginning, and you will then test the car under WOT while paying attention to the boost pressure. If the boost goes up and then falls off at higher RPM, you will want to increase the GAIN by a conservative amount (5% should be relatively conservative to begin with, then when you want to fine-tune it, you can go down to intervals of 1%). When you increase the GAIN value, the corresponding boost that you will go up to will be higher even if you leave the SET value alone. GAIN SHOULD BE SET TO 0 WHEN BEGINNING TO TUNE YOUR GREDDY UNIT.

START BOOST (also known as SET GAIN because that is what is displayed on the unit when adjusting this setting) is the lowest boost that the Greddy unit will begin increasing the boost from under WOT. You want this to be as close to the SET value as possible, since you want to keep as close to your desired boost as possible. However, setting it too close to the SET value will cause the boost to spike. You should set this to a conservative setting when beginning to tune your Greddy unit. Then you can fine-tune it later to get it as close to the SET value as possible without causing the boost to spike. Fortunately, you can set this in psi or kPa, thankfully Greddy didn't decide to let this be adjustable in % like the SET value. START BOOST SHOULD BE SET TO YOUR DESIRED BOOST PRESSURE MINUS 4 PSI (about 28 kPa).

its basically trial and error

pick a % for the set boost, say 40%, for gain i would start with zero, 1st just try to get the boost level you want, then you can increase the gain to allow it to come onto boost quicker, and work out were the increase in gain = to boost spike.

i don't have start boost on my ebc but from my understand it is when the ebc starts to open the wastegate, it also looks like the closer the start boost is to your set boost, the quicker the car will come onto boost but the more likely you will see boost spike.

i would say start with a lower number then increase it once you have the set boost correct.

also cold weather affects boost and makes it more likly to spike so, if you set it up at night it is more likly to run at a lower level during the day (mine usually spike by only 1-2psi on a cold night)

hope that helps!

[bubba]

OK, my settings are 22% SET, 7% GAIN, SET GAIN is set to 9psi.

22% SET gives me 12psi. The thing to remember is that GAIN not only affects the boost curve (you use it if you are tapering off or spiking) but it will affect the overall boost (as you increasing gain you will increase overall boost so once you get it holding boost nicely you will need to lower the SET value).

It is a good idea to only go a little over base boost to start with, then get it holding boost nicely with the GAIN setting, once it holds boost you can pump up the SET value a bit.

So now you have it running the boost you want it's time to play with the SET GAIN value, as mentioned above, this is when it will open the wastegate. You basically keep increasing this value in say, 0.5psi increments until it starts to spike (i.e. will say spike to 13-14psi then sit at 12psi) then back it off 1psi or so. You are essentially trying to find the fastest spooling time without it spiking.

Hope that makes sense.. I literally just woke up!

Edited January 5, 2008 by bubba

[IMPORTD]

ok I'll set it a bit below your settings to see what happens and to get a better understanding of it. I'm not going to blow anything up am I?

Michael I read that whole thread you have quoted, I'm not too sure on the WOT...can't really do that without a dyno??

[Kaido_RR]

ok I'll set it a bit below your settings to see what happens and to get a better understanding of it. I'm not going to blow anything up am I?

Michael I read that whole thread you have quoted, I'm not too sure on the WOT...can't really do that without a dyno??

dyno is the easy way or else just do it on the street / track etc

[mitchy_]

ok I'll set it a bit below your settings to see what happens and to get a better understanding of it. I'm not going to blow anything up am I?

Michael I read that whole thread you have quoted, I'm not too sure on the WOT...can't really do that without a dyno??

pulling onto ennis ave with traffic already doing 100km is good for WOT.

[bubba]

ok I'll set it a bit below your settings to see what happens and to get a better understanding of it. I'm not going to blow anything up am I?

Michael I read that whole thread you have quoted, I'm not too sure on the WOT...can't really do that without a dyno??

Depends on your setup I guess.. I'm using an RB25 turbo with an Rb20 actuator so base boost is 10psi. If your actuator is an RB25 item, 22% is only going to give you an extra ~1psi. Trial and extra in 5% increments to get to your desired boost, once there, if it's not holding boost or creeps up by redline, back off the SET % (say 5%) and start increasing the gain in 2% increments.

It's pretty much all got to be WOT, put it in 3rd or 4th and wind it up from ~2000rpm.. long empty roads are you friend (read: ahem.. dyno or track)