# Help tuning a Greddy Profec-B II

**URL:** <https://forums.speedlife.net/t/help-tuning-a-greddy-profec-b-ii/142029>\
**Category:** Canada Nissan Automotive\
**Created:** [March 30, 2006, 5:15pm UTC](https://forums.speedlife.net/t/help-tuning-a-greddy-profec-b-ii/142029 "2006-03-30T17:15:53Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![rocafella](https://avatars.discourse-cdn.com/v4/letter/r/bcef8e/32.png) [@rocafella](https://forums.speedlife.net/u/rocafella)\
**Post date:** [March 30, 2006, 5:15pm UTC](https://forums.speedlife.net/t/help-tuning-a-greddy-profec-b-ii/142029/1 "2006-03-30T17:15:53Z")

</div>

Hey my boost controller was installed a couple days ago but I’m having trouble tuning it. When I drive under WOT, it will go over my limit.

Like I just want it to boost up to 7psi and keep boosting at that amount but it’ll go over to about 8-9 psi before I get close to redline so I have to remove my foot off the throttle.

Anyone know how to tune it better or willing to post your settings? It’s a stock CA18DET with 3inch exhaust only.

Thanks in advance

---

<div class="post-metadata">

**Author:** ![silvia\_sr20det\_s13](https://avatars.discourse-cdn.com/v4/letter/s/ed655f/32.png) [@silvia\_sr20det\_s13](https://forums.speedlife.net/u/silvia_sr20det_s13)\
**Post date:** [March 30, 2006, 7:32pm UTC](https://forums.speedlife.net/t/help-tuning-a-greddy-profec-b-ii/142029/2 "2006-03-30T19:32:47Z")

</div>

by just putting on the boost controller u will gain atleast 1-2 psi! play with the start boost, gain, and set! go to the greddy site and d/l the manual!

---

<div class="post-metadata">

**Author:** ![rocafella](https://avatars.discourse-cdn.com/v4/letter/r/bcef8e/32.png) [@rocafella](https://forums.speedlife.net/u/rocafella)\
**Post date:** [March 30, 2006, 7:42pm UTC](https://forums.speedlife.net/t/help-tuning-a-greddy-profec-b-ii/142029/3 "2006-03-30T19:42:15Z")

</div>

Oh yea? I was wondering why it was overboosting even when I turned it off haha. Is there anyway to tune it back down to 7-8ish psi? running 10psi is too much for stock right?

---

<div class="post-metadata">

**Author:** ![mikesim](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mikesim/32/5561_2.png) [@mikesim](https://forums.speedlife.net/u/mikesim)\
**Post date:** [April 1, 2006, 1:43am UTC](https://forums.speedlife.net/t/help-tuning-a-greddy-profec-b-ii/142029/4 "2006-04-01T01:43:39Z")

</div>

10-11psi stock is reasonable on premium fuel. my friend has an EBC in his silvia and he sometimes boosts to 13-14psi. he hasn’t fried anythnig yet, but i wouldn’t recommend doing a top speed run or anything.

---

<div class="post-metadata">

**Author:** ![silvia\_sr20det\_s13](https://avatars.discourse-cdn.com/v4/letter/s/ed655f/32.png) [@silvia\_sr20det\_s13](https://forums.speedlife.net/u/silvia_sr20det_s13)\
**Post date:** [April 1, 2006, 8:47am UTC](https://forums.speedlife.net/t/help-tuning-a-greddy-profec-b-ii/142029/5 "2006-04-01T08:47:35Z")

</div>

u can run 10 psi with no fuel mods and u will be fine! just make sure u tune in the boost spike so u dont destroy turbo!