Another spool thread - boost rise time at 4000 RPM - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-12-2011, 09:19 PM   #1
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Default Another spool thread - boost rise time at 4000 RPM

Choose a gear so that car is between 65 and 70 mph at 4000 RPM.
Cruise at just above 4000 RPM, coast down to 4000, then floor it.

The data should look like this:

Setting 0 time to be whatever time it hits 100 kPa, here is sample data format (not actual)

5 psi - 0.2 sec
10 psi - 0.5 sec
12 psi - 0.6 sec
15 psi - 0.8 sec
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Old 09-12-2011, 09:22 PM   #2
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Jason, are you asking us to submit measurements?
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Old 09-12-2011, 09:42 PM   #3
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InB4Throttle Response thread!
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Old 09-12-2011, 10:00 PM   #4
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Please cross post at m.net. I am in for some actual good data though.
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Old 09-13-2011, 03:16 AM   #5
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Well maybe the data presented this way is more useful.
Boost appears to be a linear rise; it overshoots 15 psi slightly so it's pretty linear to 15 psi.

0-15 psi time:

4000 RPM - 0.58 sec ~68 mph
4400 RPM - 0.48 sec (same gear)
5000 RPM - 0.42 sec
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Old 09-13-2011, 09:55 PM   #6
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You should its a linear rise? seems to me it would start rising quicker and quicker, anyways I got some data I will post up
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Old 09-13-2011, 10:01 PM   #7
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Pull #1

Map rpm time
102 3788 3.278
110 3906 3.532
130 4150 3.96
160 4361 4.337
187 4577 4.614
205 4712 4.865

Pull #2
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Old 01-06-2012, 04:21 AM   #8
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Quote:
Originally Posted by JasonC SBB View Post
Well maybe the data presented this way is more useful.
Boost appears to be a linear rise; it overshoots 15 psi slightly so it's pretty linear to 15 psi.

0-15 psi time:

4000 RPM - 0.58 sec ~68 mph
4400 RPM - 0.48 sec (same gear)
5000 RPM - 0.42 sec
I fixed my loose wastegate and it made a big difference in my 4000 RPM data:

4000 RPM - 0.46 sec
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Old 01-06-2012, 10:42 AM   #9
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VVT, your boost control system, wastegate spring, and timing will affect the results
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Old 01-06-2012, 10:54 AM   #10
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0-21psi in just over .5 seconds.
....not a miata though
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Old 01-06-2012, 12:24 PM   #11
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Wont this thread be a little biased depending on turbo and displacement?
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Old 01-06-2012, 12:28 PM   #12
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So run a gt2554 on a 3 Liter I6 and win this thread then
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Old 01-06-2012, 12:35 PM   #13
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Wow, that would really throw this thread for a loop. I was thinking displacement ranging from 1.6-2.1L not 1.6-7.0......and just to make sure this thread is basically a dick measuring contest, correct? lol Not really relevant except for initial spool for highway racing?
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Old 01-06-2012, 12:39 PM   #14
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Quote:
Originally Posted by JasonC SBB View Post
Well maybe the data presented this way is more useful.
Boost appears to be a linear rise; it overshoots 15 psi slightly so it's pretty linear to 15 psi.

0-15 psi time:

4000 RPM - 0.58 sec ~68 mph
4400 RPM - 0.48 sec (same gear)
5000 RPM - 0.42 sec
Boost definitely DOES NOT always rise linearly. It depends on the turbo, mani, flow of the motor it's attached to, wastegate, timing....
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Old 01-06-2012, 12:42 PM   #15
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Quote:
Originally Posted by Boost Joose View Post
Wow, that would really throw this thread for a loop. I was thinking displacement ranging from 1.6-2.1L not 1.6-7.0......and just to make sure this thread is basically a dick measuring contest, correct? lol Not really relevant except for initial spool for highway racing?

To a noob like you, yes.
To others, like Jason, no.

If you read through our previous spool thread and glance over the plotted charts with everyones contributed info, you'll find it very helpful since you will see what combo's produce what curves.

Post less.
Read more.
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Old 01-06-2012, 12:42 PM   #16
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Quote:
Originally Posted by Boost Joose View Post
Wow, that would really throw this thread for a loop. I was thinking displacement ranging from 1.6-2.1L not 1.6-7.0......and just to make sure this thread is basically a dick measuring contest, correct? lol Not really relevant except for initial spool for highway racing?
My dick is bigger than yours.

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Old 01-06-2012, 12:45 PM   #17
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Quote:
Originally Posted by 18psi View Post
Post less.
Read more.
I tried to help him with this issue earlier...but some ******** keeps unbanning him.
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Old 01-06-2012, 02:04 PM   #18
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Quote:
Originally Posted by Faeflora View Post
Boost definitely DOES NOT always rise linearly. It depends on the turbo, mani, flow of the motor it's attached to, wastegate, timing....
In the case of the data I took above, it's pretty damn linear.
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Old 01-06-2012, 02:08 PM   #19
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Yes, but in many other cases, he's right imo
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Old 01-06-2012, 03:04 PM   #20
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Agreed, I was talking about my particular data set.
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