Profec B (Spec I) Update For Tip Owners With GIAC-X...To Date I Have Not Experienced "Gear Hunting"
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Profec B (Spec I) Update For Tip Owners With GIAC-X...To Date I Have Not Experienced "Gear Hunting"
@ WOT. Each week I've slowly pushed up the boost levels (low: 11 psi, high: 14 psi). Everytime I've gone WOT, I've had NO "gear hunting" problems (in Tip mode) like I did with the N75.
In fact, Now I prefer 'Tip' mode, because I can hold the turbos in the powerband longer than under 'drive'. Under the N75, I hated going WOT in 'Tip' mode, because I knew te tranny would rapidly shift btw 4th & 5th under the significantly increased boost (due to spikes).
It's obvious that the Profec B significantly reduces GIAC-X boost spikes, but I believe that having control over wastegate actuation also plays a part. With a SLIGHT adjustment of the wastegate ****, I can significantly change the behavior of the boost curve (the max boost level hits EARLIER or LATER in the RPM range). I've experimented several times over the last two weeks with this.
Just wanted to share these tidbits with all those chipped (and soon to be chipped) S4 Tips. Especially, if you have intake, and exhaust mods like myself.
In fact, Now I prefer 'Tip' mode, because I can hold the turbos in the powerband longer than under 'drive'. Under the N75, I hated going WOT in 'Tip' mode, because I knew te tranny would rapidly shift btw 4th & 5th under the significantly increased boost (due to spikes).
It's obvious that the Profec B significantly reduces GIAC-X boost spikes, but I believe that having control over wastegate actuation also plays a part. With a SLIGHT adjustment of the wastegate ****, I can significantly change the behavior of the boost curve (the max boost level hits EARLIER or LATER in the RPM range). I've experimented several times over the last two weeks with this.
Just wanted to share these tidbits with all those chipped (and soon to be chipped) S4 Tips. Especially, if you have intake, and exhaust mods like myself.
#2
APR Stage I, i don't get that under WOT, but only at partial...
I was playing with Lemmiwinks due to another Audiworlder saying that dropping the boost to 90% got rid of the hunting. Perhaps Lemmiwinks didn't do anything, but at WOT, no hunting. At half or so, gearing hunting was there! With or without the lemmiwinks change.
I don't have intake, or exhaust mods, just the chip.
I don't have intake, or exhaust mods, just the chip.
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Did The AC -Expressway Today...WOT / Partial - No Hunting - Tranny Drops Into 4th - Stays There..I'm
giving credit to Profec B. MAJOR HUNTING before I installed the Profec-B. My lo-boost setting is 11 psi (close to stock) & hi-boost is 14 psi. I will increase BOTH after I install my O.ct Boost Gauge (I use a hand held Pep (PEB) Boyz gauge for testing purposes).My mods are listed in my sig.
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