Why does it feel slower at WOT than at partial throttle?
04-25-2014, 02:34 AM
#1
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Why does it feel slower at WOT than at partial throttle?
I've been curious about this feeling for some time. My car seems to accelerate slower under WOT than under partial throttle. I've searched for the similar issues but only found a related topic with e90 BMWs. Any clue what may be going on?
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04-25-2014, 09:02 AM
#3
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Faster? Or spooling faster?
Ive noticed that rolling into the throttle seems to make a turbo spool a little faster than just punching it. More noticeable with extra big *** turbos like Hondas tend to run.
Ive noticed that rolling into the throttle seems to make a turbo spool a little faster than just punching it. More noticeable with extra big *** turbos like Hondas tend to run.
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04-25-2014, 12:27 PM
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^ Yep. And some tiny turbos get awesome surge issues along the same lines.
Also, check your throttle linkage.
And your maps vs data logs, Seen maps with a timing drop at a certain MAP/IAT that often roughly corresponds to WOT vs 80% throttle. If cold weather tends to move that 'optimal throttle point' lower, then you may have your culprit.
Also, check your throttle linkage.
And your maps vs data logs, Seen maps with a timing drop at a certain MAP/IAT that often roughly corresponds to WOT vs 80% throttle. If cold weather tends to move that 'optimal throttle point' lower, then you may have your culprit.
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04-25-2014, 12:41 PM
#5
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Could all this is based on buttdyno data. However, the car use to feel much more alive before. Or maybe I got used to it
I don't have any data with regards to spool. It just feels that the power delivery is faster. My churbo could be be consider somewhat big. 2871-ish journal.
Timing seems fairly constant and matches with the values I have in my spark table.
^ Yep. And some tiny turbos get awesome surge issues along the same lines.
Also, check your throttle linkage.
And your maps vs data logs, Seen maps with a timing drop at a certain MAP/IAT that often roughly corresponds to WOT vs 80% throttle. If cold weather tends to move that 'optimal throttle point' lower, then you may have your culprit.
Also, check your throttle linkage.
And your maps vs data logs, Seen maps with a timing drop at a certain MAP/IAT that often roughly corresponds to WOT vs 80% throttle. If cold weather tends to move that 'optimal throttle point' lower, then you may have your culprit.
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04-25-2014, 01:05 PM
#6
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I can think of some reasons part throttle feels faster:
1. better tuning at lower TPS. (Richness isn't conducive to power)
2. increased intake flow velocity from throttling the airway leads to better mixing which could lead to better torque
1. better tuning at lower TPS. (Richness isn't conducive to power)
2. increased intake flow velocity from throttling the airway leads to better mixing which could lead to better torque
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