So I decided to get The greddy profect B type -II boost controller, nice digital readout. Suppos to read in PSI, well switch over to read in PSI. Right now it reads in KPA.

So those of you who have the same Controller, Id like you to please post here, i need your help if youhave mastered how to use it. I spent close to 300 bux for it, and I had to unplug it, due to extreme Boost spikes, Try 26 psi..... ( fully built motor, dont worrie)

So it has a function on it to switch over to PSI, However, I cannot get it to do so. I need someone who has done it to please help me out here #1 with switching to psi #2 Boost spikes,why.


And you have no idea how much it means to me when people help me, I do the same for them.

 

http://www.sr20forum.com/showthread.php?t=86098

 

so, thats basicazlly saying, I should have bought the greddy profect b type-S
confusing ****.

 

the profec b works just fine. it may be a bit tricky to learn but it really isnt that hard but there are so many posts about people having problems.

first i would suggest reading the instructions off the greddy site. making sure you absolutely have all the vac line setup correctly. then you can read about what each setting does and how to adjust them. it also includes a troubleshooting explaining different problems. hers a link http://www.greddy.com/img/PHP/products/pdf/682.pdf

take a good read, then read it again, then get back to us and let us know whats up.

basically the settings go as follows

set - boost level
gain - consistency (spiking or falling off)
set gain - spool time (aka start boost)
warning - at what boost level the unit will warn you over overboosting
limiter - % of set that the unit wiull decrease boost in case of over boost.
peak - first turn it on or off
peak - highest boost recorded since you last cleared the memory.

you dont really need the warning limiter or peak to get to the desired boost level but they are nice to have.

 

with my set up

set=15%
gain=5%
set gain=80
limiter=20%
warning=100

Suppos to BE 8 psi, im hitting 11.9 psi.....
gain is 5%

mabey i need to lower the SET?

 

yes lowering the set should decrease the boost level. also your set gain is too high, ill bet you are spiking with it up at 80. general rule is that it should be about 4psi lower than your desired boost level. that way it will still spool good but not spike. turn it to 0 until you get the right boost level. then you can start to turn it up to increase spool.

also what wg spring do you have? and turn down the set for sure.

 

its a 5 psi spring. Im also re routing the dump tube back into the downpipe.

I think now I have set= 10% gain 5% ( i keep it at 5% I guess) and set gain at 100 I spike to 12.5 I need to figure out how to get a smooth set psi, before I get tuned, he cant tune a spiking boost levle.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dpetro1 &raquo;</TD></TR><TR><TD CLASS="quote"> turn the set gain to 0 until you get the right boost level. then you can start to turn it up to increase spool.

</TD></TR></TABLE>

 

your set gain is way too high, which is also causing the spike.

 

oh, ok, reason why I didnt turn it donw, cuz I though it was he actuall PSI I wanted the car to boost to, like say I put the set gain to 100, itll boost to 10 psi. ( reads in psi x 10)

so i need to figure out what set, gain, set gain how they all work with eachother and what each does.

ALSO, there is a Low boost setting and a high boost setting to add to even more confusion...

 

i think the instructions give a pretty clear definition or each setting, also i kinda highlighted how each work in my first post. the hi and lo just give you 2 options so you can just press a button and change between 2 boost levels. the settings work the same for each level. ex. i run 7psi lo boost and 10psi hi boost.

pretty much the set is going to determine boost level, gain is the consistancy, and set gain controls the spool time. if set gain is too high you will spike (as you have already experienced) the gain can be increased or deceased if you are getting boost creep or if you are loosing boost up top. pretty much the gain controls the sensitivity of the valve unit throughout the rpm range.

again, turn the set gain to 0 until you get the proper boost level. then increase it slowly to increase spool time without spiking. as for the gain 5-10% should be fine for what you are trying to achieve.

 

wow, you have been most helpful to my noob ***

So, im trying to get a set 10psi low boost and 15 psi high boost.

Imma start out with set to about 5% and slowly work my way up untill i get each desired boost level.

imma do Gain start out 5%

and set gain mabey start at 0, and work my way up untill i see the boost i want.

now after i get the boost I want, ill check to see if shes spiking or falling off, and see if I need to lower or raise gain


Sound good?


I need to get tuned for higher boost level, im only tunes for 5 psi. but I need to get a set psi, without it spiking or falling off, so I can get tuned properly.

later on ill get tuned with 100 octain and 20 psi or so.

 

so, right now im at 40% set I KEEP it at 5% gain ( i dunno does this need to go up or donw more?) and set gaine at like 85 and im hitting a nice 10 psi even, though, I think she falls off, Ill have to double check, its hard to keep an eye on the boost gauge, when I get into boost im all over the road and loosing traction.

so im falling off, set gain= higher?

I want to acheive 15 psi-18 psi, so i can get tuned properly

 

if you are falling off you need to increase the GAIN. try 10% maybe 15

 

all right, hell yea, im keeping 10 psi!! woot!! i think set = 38% gain still at 5% set gain is like 87 somewhere around there!!! no spike or falling off WOOT!!


Dauhm, I loose tracktion BAD

 

thats the beauty of EBCs they help spool time alot. happy boosting

 

put your set gain about 3-4psi below your target boost level. Once you've achieved the desired boost by upping your set value...start increasing your set gain until you see it spike 1 psi over your set value....then back the set gain off a couple tenths until its perfect.

READ THE INSTRUCTION MANUAL!!!

I cant tell you how many times Ive helped people at the track and at the shop with a profec B spec II JUST BECAUSE THEY DIDNT READ THE MANUAL!!!!

 

ok, makes sence why my set gain= around 8 ish like 85 86, and my boost level =10 psi.....


Awesome, thanx for everyones help!!! We should stickie this? For help with future noobs to the prfect b?

imma have fun trying to dial in 18 psi next...

 

hmm might have to ditch the mbc for an ebc soon

 

lets just say, Im boosting at 10 psi now, i SNAPPED an axle clean in half the other night Was actually a compliment

 

get an autozone replacement axle with a full warranty. When you snap it again just return it.

 

I have a question. In the directions for "SET" to set the boost level, it says:

"Raise the % to increase the boost, and lower the % to decrease the boost. 100% setting will boost up to the turbocharger/wastegate's limit."

What do they mean by "up to the turbocharger/wastegate's limit"?? Up to the turbocharger limit would be maxing out the turbo, right? So up to the wastegate's limit would mean up to the spring pressure in the gate???? Meaning if you are running a 7lb spring, setting SET to 100% will only boost 7lbs?

Is this a contradiction or am I confused on something.

And whats the difference between GAIN and START BOOST? they both seem to describe esentially the same thing (how quickly the gate opens).

 

"the turbochargers limit" would be infinite boost aka the wastegate would never open. the turbocharger is only limited by the wastegate and the wastegate is controlled by the ebc. without a wastegate the turbo would just max out, probably more boost than any of us are prepared to run.

as far as gain and set gain (start boost) they are completely different. gain controls the sensitivity or consistancy of the unit. the gain will make sure boost stays constant throughout the rpm range. the set gain controls spool up. increasing the set gain will allow the valve to initially stay closed longer and increase spool.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dpetro1 &raquo;</TD></TR><TR><TD CLASS="quote">"the turbochargers limit" would be infinite boost aka the wastegate would never open. the turbocharger is only limited by the wastegate and the wastegate is controlled by the ebc. without a wastegate the turbo would just max out, probably more boost than any of us are prepared to run.

as far as gain and set gain (start boost) they are completely different. gain controls the sensitivity or consistancy of the unit. the gain will make sure boost stays constant throughout the rpm range. the set gain controls spool up. increasing the set gain will allow the valve to initially stay closed longer and increase spool. </TD></TR></TABLE>

OK I was confused on how they worded the wastegate limit part. Didnt realize it meant with the wg disconnected.

 

so i can get my turbo to spool up faster?