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Old 10-19-2005, 09:31 AM   #1
jared nelson
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Default How high can you get the boost in first gear, large turbo owners speak up!!!

Title says it all.
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Old 10-19-2005, 09:48 AM   #2
happasaiyan
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with my sr50, the most i can get is about 17-18psi in first gear.

...this is with my lowest common denominator (6th gear) set to about 22psi.
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Old 10-19-2005, 12:06 PM   #3
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GT30R: about 20.5 psi, EWG, AVC-R
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Old 10-19-2005, 12:09 PM   #4
thatwrxman
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Quote:
Originally Posted by flycaster
GT30R: about 20.5 psi, EWG, AVC-R

how much horsepower is that making?
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Old 10-19-2005, 12:43 PM   #5
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TEC TD06H-50trim (basically a Green) @ 5000-6000ft asl - 20psi in 1st gear - AVC-R works wonders
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Old 10-19-2005, 01:02 PM   #6
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Quote:
Originally Posted by thatwrxman
how much horsepower is that making?
At a density altitude of about 2K (a little above sea-level, hot, humid night), it punched out 369whp, 4th gear pull, on the Matrix mustang. I'm satisfied.

Quote:
Originally Posted by davidm_sh
TEC TD06H-50trim (basically a Green) @ 5000-6000ft asl - 20psi in 1st gear - AVC-R works wonders
Yep, I'm at 4K ASL, and it is indeed sweet. First gear is gone in a blink, so's 2nd...

Hey, David, I got a question for you: are you using the gear learning feature, or do you have boost and duty cycle hard set?
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Old 10-19-2005, 03:38 PM   #7
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Quote:
Originally Posted by flycaster
Hey, David, I got a question for you: are you using the gear learning feature, or do you have boost and duty cycle hard set?
Hard set. I go pretty much off of DC and then up the DC in the start duty section for the lower gears. I try to set the boost so I have a 0% in the "start duty" section for 5th so I will have the least chance of overshooting boost targets when I goto 6th gear (AVC-R doesn't have a 6th gear in start duty section).
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Old 10-19-2005, 03:38 PM   #8
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I use a big hp shot of nitrous oxide. That works wonders. I go WOT, gently step off the clutch and then flip the switch that sprays the nitrous. Whooo hoooo hello 1.6 flat sixty fts

Clark
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Old 10-19-2005, 03:57 PM   #9
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AZ, glad to see you chimed in, even though it was a bit OT, can you chime in on another APS arguement im having.... someone at aps is trying to tell people, that the sr55 only being able to hit 11 psi in first gear, is due to the stis inability to spool that turbo up in the lower gears, which is in part correct, but not in so much that a ****ing SMALL breed of gt30r cannot get peak boost in the lower gears.

i say that the problem is mostly the actuator springs that come on the turbos. aps says that its not that. heres the link, you can read through what has been said thus far, since im sure my synopsis(sp?) is incomplete.

if youd be so kind, the first few posts on this topic start at my post which is number 35 (on page 2) http://forums.nasioc.com/forums/show...=849368&page=2
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Old 10-19-2005, 04:16 PM   #10
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I have a GT35r on an o5 STI ... I see target boost in 1st gear (18-22 psi, depending on setting) although not until 5800RPM...it still goes by in an instant.. actually from what I can tell in my datalogs, 1st lasts about 1.4 seconds, 2nd about 2.1, and 3rd about 3.5 seconds.

Cheers.
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Old 10-19-2005, 04:23 PM   #11
jared nelson
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thanks for the info, so you are seeing 18-22 psi in first gear?
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Old 10-19-2005, 05:03 PM   #12
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Quote:
Originally Posted by syoung0298
I have a GT35r on an o5 STI ... I see target boost in 1st gear (18-22 psi, depending on setting) although not until 5800RPM...it still goes by in an instant.. actually from what I can tell in my datalogs, 1st lasts about 1.4 seconds, 2nd about 2.1, and 3rd about 3.5 seconds.

Cheers.
Nice. Sub four second sixty runs...

I'd see 5800 18PSI at the in first with AVCR and a green.
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Old 10-19-2005, 05:10 PM   #13
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Quote:
Originally Posted by jared nelson
AZ, glad to see you chimed in, even though it was a bit OT, can you chime in on another APS arguement im having.... someone at aps is trying to tell people, that the sr55 only being able to hit 11 psi in first gear, is due to the stis inability to spool that turbo up in the lower gears, which is in part correct, but not in so much that a ****ing SMALL breed of gt30r cannot get peak boost in the lower gears.

i say that the problem is mostly the actuator springs that come on the turbos. aps says that its not that. heres the link, you can read through what has been said thus far, since im sure my synopsis(sp?) is incomplete.

if youd be so kind, the first few posts on this topic start at my post which is number 35 (on page 2) http://forums.nasioc.com/forums/show...=849368&page=2

Peter is working Sales for APS. This is obvious man. The Actuator on the SR is crap. This is why I run two 9lb springs strapped on the gate. This will hold the gate shut and allow more boost in lower gears. It also allows more boost at redline. There is always an advantage to get the gate pressure close to your actual boost pressure. Slapping on an 8 psi off the shelf gate and then asking that gate to run 20 psi is not good engineering. The gate should hold at least 14-15 psi alone. Then a boost controler can be used to get the extra boost you need for maping.

Clark
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Old 10-19-2005, 06:14 PM   #14
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GARD THANK YOU CLARK, i am not taking crazy pills!
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Old 10-19-2005, 06:30 PM   #15
V5-STi
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What actuator is on the APS SR40 and is this sufficient or would an uprated actuator benefit that turbo too......i see that the one i have is tightened right up on the adjustment!!
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Old 10-19-2005, 08:13 PM   #16
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Quote:
Originally Posted by jared nelson
thanks for the info, so you are seeing 18-22 psi in first gear?

yuppers... I haven't set target boost above 22 psi yet, but assume that above 22 psi is also achievable, just at a higher RPM.
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Old 10-19-2005, 08:15 PM   #17
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ive got a 38mm tial gate, and I once forgot to hook up my boost controller, did a wot run in first gear, and detonated my way to about 28 psi on 91 pump gas.
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Old 10-19-2005, 08:18 PM   #18
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Quote:
Originally Posted by davidm_sh
Hard set. I go pretty much off of DC and then up the DC in the start duty section for the lower gears. I try to set the boost so I have a 0% in the "start duty" section for 5th so I will have the least chance of overshooting boost targets when I goto 6th gear (AVC-R doesn't have a 6th gear in start duty section).
Thanks, always looking for tips. PDXTuning set it up with hard duty and boost, turned learning off except for 4th gear, upped the start-duty for the first 3 gears, left 4th set to zero, then dialed in a negative number for 5th.

Seems to work OK, but I still get an occasional overboost of 0.1-0.15 bar, which they tell me is no big deal. Since they tuned it at sea-level, and I'm at 4K asl, I concur. The whole thing is still a little mysterious to me, but what can you expect given the "manual." What a joke.
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Old 10-19-2005, 11:03 PM   #19
petersgottachooseanewname
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Quote:
Originally Posted by jared nelson
AZ, glad to see you chimed in, even though it was a bit OT, can you chime in on another APS arguement im having.... someone at aps is trying to tell people, that the sr55 only being able to hit 11 psi in first gear, is due to the stis inability to spool that turbo up in the lower gears, which is in part correct, but not in so much that a ****ing SMALL breed of gt30r cannot get peak boost in the lower gears.
That's not quite correct, what I'm saying is you will normally see higher boost pressure in the higher gears where you're at greater engine load for a longer duration of time.

Quote:
Originally Posted by jared nelson
i say that the problem is mostly the actuator springs that come on the turbos.
No doubt a stronger boost control actuator will impact on the boost rise/curve to some extent, that said I still believe that the boost pressure will be greater in the higher gears where there's sustained engine load for a longer duration.

Peter
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Old 10-20-2005, 01:03 AM   #20
flycaster
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Quote:
Originally Posted by jared nelson
ive got a 38mm tial gate, and I once forgot to hook up my boost controller, did a wot run in first gear, and detonated my way to about 28 psi on 91 pump gas.
Sounds expensive. But...how come the waste gate didn't just open at spring pressure? (and if I'm missing something in the translation, mea culpa)

When I remove the AVC-R, my tial opens right at 0.9 bar. It's perfect for when my daughter asks to borrow the car. She's doesn't know the difference, and I rest a lot easier. Not to mention there's no chance one of her friends will mistake it for a game-boy and turn the motor into a roman candle.
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Old 10-20-2005, 01:59 AM   #21
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yeah, no, if you do not assist the underside of the diaphram, with boost pressure, it will not open at that boost pressure. (on my wg atleast )
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Old 10-20-2005, 11:50 AM   #22
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Huh, as I said my 44 tial comes with a 0.9 bar spring so once it reaches that pressure in the up-pipe it pops full open and kills further spool-up unless the AVC-R is there to keep it shut until it reaches more pressure. Maybe it jammed because it was gunked up?
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Old 10-20-2005, 01:46 PM   #23
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thats wierd, because the actual rate of a .9 bar spring isnt just .9, if i remember correctly. it is .9 psi MAP when the WG will open, IF you have a line run from the manifold, or IC pipe, to the under side of the diaphram. for example. on my car. (and this maybe some wierd ass different with our WGs or something), but my tial 38 has a .7 bar spring. if i run a hose from the manifold to the underside nipple or bottom nipple on the wg, then, at 10 psi, or .7 bar, the WG will open. IF, i take that hose off, and run NO hoses to either nipple on the WG, then the boost will climb WAY past levels where I want to let the motor boost. My greddy gauge started scaring me as it neared 2 bar by the time the impulse got from my brain to my foot, and I let off. and that was in first gear. i ordered the wg with a .7 bar spring, so um sure of that.

can someone with an idea chime in on this?
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Old 10-20-2005, 02:19 PM   #24
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Sorry, but I hadn't even considered that you didn't have the intake line connected. Brain fart on my part - I'd completely forgotten about that little detail.
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Old 10-20-2005, 02:23 PM   #25
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oh, yeah, ok.! hha, so you have both on, then just pull the top one for your makeshift daughter/valet mode.
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