How much does boost drop in the gear changes?
Thread Starter
Melting Slicks
Joined: May 2005
Posts: 3,461
Likes: 161
From: Las Vegas Nevada
St. Jude Donor '08
How much does boost drop in the gear changes?
I am curious as to how much boost drops during a gear change. I have heard that automatics loose very little boost and manuals loose a lot. I’m not trying to toot my own horn, but I can row the gears pretty darn fast. Would watching the boost gauge during a shift really be accurate enough to tell or do you have to somehow use some sort of equipment to log this? What do you think?
Thanks,
Clayton from Las Vegas
Thanks,
Clayton from Las Vegas
Drifting
Joined: Aug 2004
Posts: 1,837
Likes: 0
From: . Kona, HI. Orem, UT. PSL, FL
you should be able to log boost/vacume with tuning software and an electric sensor. the sensor will have an electrical output that can be tapped for a signal. kinda the ame way you log AFR's in HPtuners. the nitrous guys sometimes log bottle pressure over a run and match them to their AFR's . you will just have to figure out the values for the tuning software.
xample: sensor output .5v = 5lbs of boost. once you have the sensors highs and lows you an fill the rest in.
xample: sensor output .5v = 5lbs of boost. once you have the sensors highs and lows you an fill the rest in.
Former Vendor
Joined: Feb 2004
Posts: 10,876
Likes: 8
From: Las Vegas NV
St. Jude Donor '06 & '12
You worry about boost drop with turbos not S/C's.
I mean, I guess you could, but since its 100% rpm related (and belt driven), there is nothing you can do about it.
TT's on the other hand is a different story. The time in between shifts causes the turbos to loose some of their momentum. Hence the reason they want as little spool down as possible. The longer the interval, the more the turbo has to ramp back up.
I mean, I guess you could, but since its 100% rpm related (and belt driven), there is nothing you can do about it.
TT's on the other hand is a different story. The time in between shifts causes the turbos to loose some of their momentum. Hence the reason they want as little spool down as possible. The longer the interval, the more the turbo has to ramp back up.
Former Vendor
Joined: Feb 2004
Posts: 10,876
Likes: 8
From: Las Vegas NV
St. Jude Donor '06 & '12
They actually make a boost guage (like in your guage pod) that allows you to "Record and Playback" your run. This will let you see first hand whats going on.
Former Vendor
Joined: May 2006
Posts: 402
Likes: 2
From: Houston TX
Drifting
Joined: Aug 2004
Posts: 1,837
Likes: 0
From: . Kona, HI. Orem, UT. PSL, FL
You worry about boost drop with turbos not S/C's.
I mean, I guess you could, but since its 100% rpm related (and belt driven), there is nothing you can do about it.
TT's on the other hand is a different story. The time in between shifts causes the turbos to loose some of their momentum. Hence the reason they want as little spool down as possible. The longer the interval, the more the turbo has to ramp back up.
I mean, I guess you could, but since its 100% rpm related (and belt driven), there is nothing you can do about it.
TT's on the other hand is a different story. The time in between shifts causes the turbos to loose some of their momentum. Hence the reason they want as little spool down as possible. The longer the interval, the more the turbo has to ramp back up.
here i was thinkin he was turbo....
Le Mans Master
Joined: Oct 2005
Posts: 7,088
Likes: 1,829
From: Metro Detroit Michigan
With your centri supercharger, the turbine stays spooled even when you close the throttle. Boost is back as fast as the throttle can open, so it's not as much of an issue as with a turbo.
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Former Vendor
Joined: Feb 2004
Posts: 10,876
Likes: 8
From: Las Vegas NV
St. Jude Donor '06 & '12
THATS, what I was meaning. 
Sorry for my unclear explanation. It was a looonng day at work.
Well, I'm off to the garage to stab my motor in..
Sorry for my unclear explanation. It was a looonng day at work.
Well, I'm off to the garage to stab my motor in..
00 C5, 05 CTS-V
Joined: Dec 2005
Posts: 1,031
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From: Ashland Ohio
Get a TT guys to show you their log....
Norm
