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At what rpm are you at full boost?

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Old Apr 2, 2008 | 05:12 PM
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Default At what rpm are you at full boost?
Just curious what rpm is your boost coming in and what rpm are you at full boost?
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Old Apr 2, 2008 | 05:49 PM
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Boost starts to come in at 2000 rpm and is maxed at 11 psi at 3000 rpm. This is a 347 with a T67 0.96 A/R front mount, through an M6 with 3.50 gears and standard diameter tires.
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Old Apr 2, 2008 | 05:55 PM
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Max boost is at max RPM for me
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Old Apr 2, 2008 | 05:57 PM
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on the setup I was running in my sig I was spooling by 3k and at full boost by 3600 or so, thats with 8.5 CR on a 408 with a standard GT 55 (91.5mm) turbo. I actually think my compression was closer to 7.7:1 though.
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Old Apr 2, 2008 | 06:07 PM
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well with my 348 ci S88 setup i see 10.5 psi @ about 3300.. i would say 20 psi by 3600/3800 but never turned it up that high yet due to dyno limits...
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Old Apr 2, 2008 | 06:25 PM
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I'm an auto so converter flash plays a big part in the RPM numbers.

370 cubes, rear mount ST80, 1.00 a/r, 3rd gear I build at 3000 and see 14psi at 5000 in my logs. Calculated RPM off of MPH, gear and tires size is build boost at 2700 rpms and see full boost at 3000.

A better way to describe it is cruising at 2700 rpms in 3rd @ 70 mph, WOT, 1psi @ 72 MPH 3000 rpms, 14 psi @ 80 mph 5000 rpms. That means at full boost in 3rd at 80mph i'm seeing 1700 rpms of converter slip.
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Old Apr 2, 2008 | 06:28 PM
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Originally Posted by ChevyChad
Max boost is at max RPM for me
Me too.
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Old Apr 2, 2008 | 06:37 PM
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Dont have time to watch the gauge LOL
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Old Apr 2, 2008 | 08:20 PM
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Originally Posted by JMBLOWNWS6
Dont have time to watch the gauge LOL
lol well you would have three different answers....
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Old Apr 2, 2008 | 09:19 PM
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Originally Posted by JMBLOWNWS6
Dont have time to watch the gauge LOL
Depends on the gear for me (M6 car). For FULL boost it's as follows: 1st....5K, 2nd...3.6K, 3rd and up by 3KRPM. Only pushing 5PSI, but it's through a rear mount.
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Old Apr 2, 2008 | 09:27 PM
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What a pointless thread. Sorry. Every single member will have different results.
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Old Apr 2, 2008 | 10:15 PM
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Originally Posted by ninetres
What a pointless thread. Sorry. Every single member will have different results.
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Old Apr 2, 2008 | 11:49 PM
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3500
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Old Apr 3, 2008 | 12:39 AM
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stock 3.8 motor...turbonetics T72

I see full boost (15psi) by 3700rpms.
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Old Apr 3, 2008 | 01:17 AM
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Originally Posted by ChevyChad
Max boost is at max RPM for me
Sorry to hear that bro Nothing like getting sideways at only 3500 rpms and 75 mph hee heee heeee
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Old Apr 3, 2008 | 03:51 AM
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Originally Posted by ninetres
What a pointless thread. Sorry. Every single member will have different results.

Exactly. If those member's communicate their setups everyone reading will have a better grasp of how certain turbos/turbines operate on the street.
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Old Apr 3, 2008 | 06:52 AM
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Originally Posted by 52172
Sorry to hear that bro Nothing like getting sideways at only 3500 rpms and 75 mph hee heee heeee
Oh, I can break loose at 75 at the top of 3rd no problem. The really scary part is when it starts drifting sideways near the top of 4th around 120 or so 275/30/19 tires are not very boost friendly thats for damn sure!!!
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Old Apr 3, 2008 | 08:33 AM
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Max tq at 2700 rpm's
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Old Apr 3, 2008 | 09:07 AM
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Originally Posted by redrumss
Max tq at 2700 rpm's
That's nasty
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Old Apr 3, 2008 | 10:58 AM
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Originally Posted by ChevyChad
Oh, I can break loose at 75 at the top of 3rd no problem. The really scary part is when it starts drifting sideways near the top of 4th around 120 or so 275/30/19 tires are not very boost friendly thats for damn sure!!!
lol thats exactly what happens with me in 4th gear, but thats with 315 bfg drag radials
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