Mr.s13r
03-19-2009, 03:32 PM
I finally got a boost controller that works, thanks to Openthrottle.
I follow the instruction on this thread here and can't seem to understand certain things.
HOW TO: How to tune your GReddy Profec-B Spec II - SR20 Forum (http://www.sr20forum.com/turbo-guides/86098-how-how-tune-your-greddy-profec-b-spec-ii.html)
Here is the shorter version:
The following steps should be taken in exactly this order, taking into consideration all of the previous information:
1. Change boost pressure units to psi if so desired (see manual).
2. Set WARNING to your desired boost pressure plus 1 psi (about 7 kPa) (see above).
3. Set START BOOST (SET GAIN) to your desired boost pressure minus 4 psi (about 28 kPa)(see above).
4. Clear PEAK boost value (see above).
5. Set LAST BOOST to ON (see above).
6. Set GAIN to 0 (see above).
7. Set SET to 30% (see above).
8. Set LIMITER to SET minus 4% (26% if you followed #7).
9. Test for boost falloff at high rpm. You should probably do this in a wide open area with no other cars nearby and preferably no cops. It is also good to have somebody in the car with you that can watch the gauge while you concentrate on not wrecking your car. If there is no boost falloff, then go to #10. If there is boost falloff, then increase the GAIN by 5% and test again. Keep in mind that 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. Repeat until the boost pressure does not decrease, or until you feel surging. If you feel surging and the boost pressure still decreases (not sure if this is possible) then decrease to the last level that you did not feel surging at.
10. Increase SET by 2% and adjust LIMITER accordingly, then test again. Keep increasing by 2% until desired boost level is obtained.
11. Increase START BOOST (SET GAIN) by 1 increment and test until surging is felt or the WARNING level is hit and the display turns red, then decrease to the previous setting.
Once you have followed these steps, you will have roughly tuned your unit. To fine-tune it, repeat steps 9 and 10 except this time only increase or decrease by 1 increment.
This is what i don't get from the instruction
The instruction listed said to set GAIN to 0 in number 6 but the lowest i can set it to is 5, can someone confirm this.
Another thing is on number 8 it said to set the LIMITER to the SET value minus 4%, but in my LIMIT option it only goes to 20% max. So again, can someone check this as well.
I just wanted to set my boost to 12psi that can hold all the way to redline. Can someone with Sr with the stock turbo tell me there setting so i can base it off of that. So i guess on my low setting I'll set the SET to 0 to keep it at 7psi stock and only tune the HI option for 12 psi but don't know everything yet.
Thanks
I follow the instruction on this thread here and can't seem to understand certain things.
HOW TO: How to tune your GReddy Profec-B Spec II - SR20 Forum (http://www.sr20forum.com/turbo-guides/86098-how-how-tune-your-greddy-profec-b-spec-ii.html)
Here is the shorter version:
The following steps should be taken in exactly this order, taking into consideration all of the previous information:
1. Change boost pressure units to psi if so desired (see manual).
2. Set WARNING to your desired boost pressure plus 1 psi (about 7 kPa) (see above).
3. Set START BOOST (SET GAIN) to your desired boost pressure minus 4 psi (about 28 kPa)(see above).
4. Clear PEAK boost value (see above).
5. Set LAST BOOST to ON (see above).
6. Set GAIN to 0 (see above).
7. Set SET to 30% (see above).
8. Set LIMITER to SET minus 4% (26% if you followed #7).
9. Test for boost falloff at high rpm. You should probably do this in a wide open area with no other cars nearby and preferably no cops. It is also good to have somebody in the car with you that can watch the gauge while you concentrate on not wrecking your car. If there is no boost falloff, then go to #10. If there is boost falloff, then increase the GAIN by 5% and test again. Keep in mind that 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. Repeat until the boost pressure does not decrease, or until you feel surging. If you feel surging and the boost pressure still decreases (not sure if this is possible) then decrease to the last level that you did not feel surging at.
10. Increase SET by 2% and adjust LIMITER accordingly, then test again. Keep increasing by 2% until desired boost level is obtained.
11. Increase START BOOST (SET GAIN) by 1 increment and test until surging is felt or the WARNING level is hit and the display turns red, then decrease to the previous setting.
Once you have followed these steps, you will have roughly tuned your unit. To fine-tune it, repeat steps 9 and 10 except this time only increase or decrease by 1 increment.
This is what i don't get from the instruction
The instruction listed said to set GAIN to 0 in number 6 but the lowest i can set it to is 5, can someone confirm this.
Another thing is on number 8 it said to set the LIMITER to the SET value minus 4%, but in my LIMIT option it only goes to 20% max. So again, can someone check this as well.
I just wanted to set my boost to 12psi that can hold all the way to redline. Can someone with Sr with the stock turbo tell me there setting so i can base it off of that. So i guess on my low setting I'll set the SET to 0 to keep it at 7psi stock and only tune the HI option for 12 psi but don't know everything yet.
Thanks