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Old 01-24-2005, 10:27 AM   #1
swift2fly
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Default cobb AP vf34 users(stage 2.5)

for you stage 2.5 users..when does the turbo spool? and when do you hit full boost? also what boost do you guys peek at? thanks.

*i know a guy runnin a Turboxs stage 4 and his vf34 spools at 2600K and full boost @ 3200K. wonderin' if i can get the same deal with the AP.
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Old 01-24-2005, 04:27 PM   #2
earlmale
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in what gear?
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Old 01-24-2005, 08:07 PM   #3
swift2fly
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Quote:
Originally Posted by earlmale
in what gear?

any. i would like to know 1-5. man i am pissed it's been a week since i ordered the pinks and it is still not here!
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Old 01-24-2005, 06:26 PM   #4
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i have the VF30 stage 2.5 and i see full boost between 3200-3500K. i can't really get a full look at my boost gauge and rpm's because from that point the car just takes off. but i feel it pull hard like a mofo at around there. i'm pretty sure positive boost pressure starts around 2700-3000K or so. i'm peaking at about 17.5psi max. that's pretty good considering that the 2.5 map retains the stock intercooler and fuel pump. imagine what will happen once it's tuned for upgraded intercooler and pump. WOW!
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Old 01-25-2005, 12:16 PM   #5
earlmale
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guys, "positive boost response" @ 2700 means nothing if you don't say what gear. it also depends on how you're driving- did you redline 2nd and then go to 3rd with turbo spooled up already? or did you start up in 3rd gear @ around 1200 rpm and go from there? that'd be for evaluating your claims based on observations in 3rd gear
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Old 01-25-2005, 12:51 PM   #6
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okay, mine is in 3rd gear. in fact, 3rd gear is when she pulls the hardest all the way to redline. as i said though, i'm not too sure, i could be less because i can't watch the boost gauge and watch the road at the same time the car is pulling like a freight train.
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Old 01-25-2005, 12:55 PM   #7
earlmale
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3rd gear and... ok, so try this- shift from 2nd to 3rd @ ~ 2200 rpm- so the engine is bogged down in 3rd. then tell me what your boost response numbers are
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Old 01-25-2005, 02:06 PM   #8
blackie
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eeek mine hits full boost at around 4000 rpms. meybe its because of my header and large tmic. i dont know. im working on a custom restrictor for my turbo that should help me hit target boost easier and sooner.
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Old 01-25-2005, 02:53 PM   #9
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I'm having low boost issues, so I cannot give you an accurate target boost reading. However, I can tell you that I am seeing postive boost as early as 1600rpm in gears 3-5. My vf34 is PnP.
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Old 01-25-2005, 02:55 PM   #10
earlmale
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the headers delay boost apparently, but i don't know if a TMIC does. a custom tune should be able to fix that problem.

i'm running cobb 2.5 and i get full boost a bit under 4000 rpm in 3rd- that's when i start in 3rd gear with the engine bogged, on flat land
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Old 01-25-2005, 03:04 PM   #11
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when speaking of "positive boost pressure" i mean that throttle is open and the engine is sucking in air via the turbo. so in essence pre-spool starts from about 2200-2500K then i start to see positive manifold pressure at about 2700K and full boost at about 3200-3500K in first gear. sorry if i left anything out. i'll try a 3rd gear pull, but i'm pretty sure it's gonna be about the same. we'll see.

blackie: it could be closer to 4000K, not too sure because the needle hits so fast and my eyes are peeled on the road after that, it's too quick to tell, but it's around that vicinity.
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Old 01-25-2005, 06:23 PM   #12
zanderspeed
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sorry, you mean positive boost as in when there is no longer vacuum?? (i.e. 1psi and greater)
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Old 01-25-2005, 06:24 PM   #13
clamdip
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Quote:
Originally Posted by zanderspeed
sorry, you mean positive boost as in when there is no longer vaccum?? (i.e. 1psi and greater)
yes, when the engine is now sucking in more air.
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Old 01-25-2005, 06:36 PM   #14
zanderspeed
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yeah, I see it at 1600 rpm with my pnp vf34...
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Old 01-25-2005, 06:49 PM   #15
clamdip
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actually, i wanted to do some datalogs with deltadash to get a much more accurate reading.
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