setup: 1995 LS with greddy kit

for all those who own a Greddy profec b spec ii ebc, i have recently purchased and installed one.

currently set is at 2% gain is at 80% and set gain is 0.

my goal is to keep it at 8psi or close to 8 consistently without spiking the peak about 8.5 or so, it is on an internal gated turbo, 18g greddy kit.

the current setting I hit 8.6 peak then it drops to 7.7-7.8 about and stays there.

from what I understood, the set raises boost, if the WG spring is set to 10psi 10% set should raise the boost to 11psi. My gate is 6psi. Gain should be increased when the boost falls off with rpm which it did when I had set to 30 %, but increasing the gain also increased the peak, it would spike to 10psi almost. And I know set gain is when you want the gate to start to open, to increase spool so I left that out for now.

what am I doing wrong? is this just a spike problem with an internally gated turbo? cause when the ebc is off, it peaks at 8psi then goes to 6.5 and stays there and falls off at higher RPM.

 

ne1

 

no one is using the same ebc? what are your settings like with internal gates?

 

i have that EBC but im not currently using it.. im running off the wastegate spring right now till i get it tuned... ive read through the manual and i think its confusing as hell.. ill wait for the tuner to mess with it so that i dont do anything wrong with it..

 

better learn it, don't rely on your tuner, mine had no clue about the profec II. Here is a good link talking about the profec II https://honda-tech.com/zerothread?id=848260

 

thanks for the link, anyone using it with their greddy kit, are my settings really off

 

try 35%, gain at 10%, set gain at 65 (6.5 psi)

 

since yo have greddy kit you have internal wastegate right? if so you need to find out what psi your wastegate is set at from factory. once you find that out then you can find out your max psi u can boost. when you find that out then you can follow the directions i posted below.....

also make sure that you have your boost controller solonoid connected properly. many times you think you have it right but you dont. i had it all wrong for 4 months until i found out the right way lol.


here ya go. i dont know of any way better to explain it:
if you have a 5.5 psi spring then the max you can boost is found out by this:
5.5 psi x 2 = 11psi take half of that which is 5.5 and add it to 11 psi which = 16.5 psi.

so the max you can boost is 16.5 psi that is your wastegate springs limit for full boost.

so on this greddy profec b the first setting is changed just by turning the ****. the range is from 0-100 percent. this can be interpreted as a percent of yout max boost which is 16.5 psi ok? so say you want to boost 10 psi for example.... you need to calculate what percent of 16.5 = 10 psi. so if 0 % = 0 psi then that means 100 % = 16.5 psi right? so if you want to boost 10 psi then you need to find out what percent of 16.5 psi = 10 psi......

so we discover that 61 % of 16.5 psi = 10.065 psi thats close enough.

set your SET boost ( turn the ****) to 61%
leave the gain @ 10 for now (play with that later to help if it spikes)
now the 3rd setting SETBOOST (setting right after GAIN) this is read in PSI. so if is displays 103 you can interpret that as 10.3 psi ok? and you want this setting set as close to your very first setting of 61 % which is also known as 10 psi.

so since your first setting is @ 61% AKA 10 PSI then you would probably want to have your 3rd setting SETBOOST set @ 90 or AKA 9.0 psi.


hope that helps and remember that this is for a wastegate spring of 5.5 psi

if yo have a different size wastegate spring find out the MAX limit by using the procedure mentioned first above in my post and then figure out everything else accordingly

 

oh yea one more thing. if you turn off your EBC then you are supposed to boost whatever your wastegate is set at. and you stated that when you turn the greddy unit off you boost 8 psi and then drop off to about 6.5 psi. if thats the case it sounds like you have a boost leak somewhere in your charge pipes. check all your couplers and makes sure everything is tight. boost dropping off at higher RPM's when the EBC is off means something is leaking somewhere

 

my calculation was based on your stated 6psi wastegate

 

ok, but the stock greddy actuator should be set to 6psi as far as I know.

but it peaks at 8psi then holds at 6psi. Maybe I am leaking somewhere, but I dunno, everything seems to be ok.

Is there a way to isolate the boost leak? especially if its minor? Some also say with the greddy 24v IC they boost about 7psi, so I dont know what it should be without the EBC really.

according to your info, and if my gate spring is 6psi, I should be able to achieve 8psi with 50% set. When I had the set at about 35% and gain at 60 about, it would peak out at 8.8 sometimes more then drop off to 6psi.

no I have it set at set 3, gain 80, set gain 0, and it holds 7.8 about and peaks at 8.6

do internal gatted turbos peak higher then what they hold? is that normal?

 

i set the gains as a reference at about 50% and then play with the set boost from there. I dont think that will work for that low of boost though. i think when i was running that low boost i went down to like 20% or 35% and played with the set boost from there. i think its best to keep the gains kind of close to eachother. i havent played with mine in forever though. its been about a year or so

 

thanks, I'm just trying to figure this thing out, and see if it can reach and hold boost consistently, so far no...

but I will need to try all this new stuff tom, cause I dont have work and can mess around.

 

i never really had probs with mine holding.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr206 &raquo;</TD></TR><TR><TD CLASS="quote">i never really had probs with mine holding. </TD></TR></TABLE>

what kinda setup are you running? internal gate?

 

well I tried all the recommendations, and the formula, It was too much, it boosted over 12psi, then I was unaware, but I thought I turned the EBC off, but the hose to the actuator popped off, so I tried to boost, hit 16.5 psi.

so far everything seems ok, but I know I dont have fule maps for anything about 10.9, so i'm hoping nothing bad happened, it was only for a sec.

I will be fixing the hoses tom, and then try again.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DeadLock23 &raquo;</TD></TR><TR><TD CLASS="quote">

what kinda setup are you running? internal gate? </TD></TR></TABLE>


No i have an external gate.