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Old 09-25-2012, 02:47 PM   #51
littlewhitewagon
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I have an ATP GTX3076R with Perrin 3" inlet, HKS downpipe, HOA EBCS, Perrin FMIC and HKS BPV. I run 22psi without issues, spikes will sometimes get to about 24psi or so. I am on pump CA91. More than 22psi is not going to happen for extended periods without higher octane fuel.
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Old 09-25-2012, 03:27 PM   #52
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Quote:
Originally Posted by OC_Nooby View Post
Its not my map sensor. My boost gauge reads 22 psi as well as my netbook with the actuator wired shut. ATP is really leaning on the inlet not being a 3"

What inlet do you have NSFW?
What boost gauge are you using?

How is your netbook measuring boost? If it's logging data from the stock ECU then your MAP sensor is part of the problem. That's where the ECU gets the boost numbers that your netbook is showing.

I have an APS 3" inlet.

Last edited by NSFW; 10-15-2012 at 01:42 AM. Reason: typo
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Old 09-25-2012, 03:47 PM   #53
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Quote:
Originally Posted by OC_Nooby View Post
Talking to ATP they say my inlet being 2.5" plus the step down adapter they supplied 3" to 2.5" is causing me the problem.

I honestly don't think its that restrictive..... Thoughts?
I don't think it's that restrictive either. The intake tract is still going to neck down from 3" to 2.25" no matter what, since that's how big the compressor is. Using a 3" inlet just means that it necks down a few inches later than otherwise.

Try hooking your boost gauge's sensor to something upstream of the intercooler. If you could T it from the fitting that's driving the MBC that would be ideal. Maybe the turbo is putting out 25psi and the stock TMIC is costing you 3psi at this flow rate. That seems like a lot, but it's not unthinkable.
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Old 09-25-2012, 04:44 PM   #54
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Quote:
Originally Posted by NSFW View Post
I don't think it's that restrictive either. The intake tract is still going to neck down from 3" to 2.25" no matter what, since that's how big the compressor is. Using a 3" inlet just means that it necks down a few inches later than otherwise.

Try hooking your boost gauge's sensor to something upstream of the intercooler. If you could T it from the fitting that's driving the MBC that would be ideal. Maybe the turbo is putting out 25psi and the stock TMIC is costing you 3psi at this flow rate. That seems like a lot, but it's not unthinkable.
That's what I was saying earlier, a stock TMIC isnt meant to flow that amount of air. Thats where I'd look as a possible restriction.

The 3" inlet is really ideal, a 2.4" should work though. Also, what A/R are you running?

If you're doing all the logging right, and not just looking at MRP on a stock MAP, thats what I see as possible issues.

Also, something interesting, a buddy of mine with a volvo was recently having a similar issue where he couldn't make over 18psi of boost. After weeks of exhausting testing, he took off the aftermarket air filter, and replaced it with stock. BAM, problem was fixed like that. Very strange and rare, but things like this can happen.
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Old 09-25-2012, 07:33 PM   #55
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Boost gauge is a DEFI (forgot the model). Regardless its not a boost gauge error reading...

A/F goes from 11.2-11.9 with 94oct + Meth (current setup). Without Meth it goes from 11.2-12.4. Both at 22psi, 4.5k to 7k is where I start reading my A/F.

I was tired of running 12psi so I just put a boost controller and upped it to 22psi then tuned it with the meth controller.

I'm going to remove the o2 sensor tonight and use a scope to see if I can see anything (assuming my buddy grabbed it from work).
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Old 09-25-2012, 08:01 PM   #56
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whoa...what you just posted sounds like a whole new issue. are you saying that you just slapped on a boost controller and upped the boost 10psi without any map changes?


also, is your fuel table setup to taper from 11.2-11.9 or does the fueling do that on it's own?
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Old 09-25-2012, 08:45 PM   #57
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Originally Posted by amalgrover View Post
whoa...what you just posted sounds like a whole new issue. are you saying that you just slapped on a boost controller and upped the boost 10psi without any map changes?


also, is your fuel table setup to taper from 11.2-11.9 or does the fueling do that on it's own?

No it shouldn't tapper. It should only tapper to 11.2 I need to slightly rescale my MAF/injectors to be honest. Don't worry, I know what I'm doing.

Regardless if my OL MAP was 100% accurate and say was meant to hit 11.5 A/F from 4.5k-7k then IF I introduced Meth Id probably hit 11 A/F assuming it richens up by 0.5 A/F. So I'm aware my scaling needs to be touched up and rest assured I will go back to wastegate boost and rescale appropriately but the current A/F is pretty good. Rich @ Peak torque and tappers off.

In all honestly id really want 11.5 A/F @ peak torque and tapper of to 11.9.

Trust me when I say this, I have listened with my det cans for many hours. When I get my boost issue fixed, I'll go back, scale everything properly.


Also remember, I can't surpass 22psi with the wastegate wired shut....

Last edited by OC_Nooby; 09-26-2012 at 12:40 AM.
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Old 09-25-2012, 11:37 PM   #58
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Just in case you missed this:

Quote:
Originally Posted by NSFW View Post
Try hooking your boost gauge's sensor to something upstream of the intercooler. If you could T it from the fitting that's driving the MBC that would be ideal. Maybe the turbo is putting out 25psi and the stock TMIC is costing you 3psi at this flow rate. That seems like a lot, but it's not unthinkable.
It's my favorite theory right now.

If nothing else you'll end up with a measurement of the stock TMIC's pressure drop, which would still be pretty cool.
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Old 09-26-2012, 12:39 AM   #59
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Quote:
Originally Posted by NSFW View Post
Just in case you missed this:



It's my favorite theory right now.

If nothing else you'll end up with a measurement of the stock TMIC's pressure drop, which would still be pretty cool.
I agree with your theory. I believe the tmic is restricting me some. BUT, a shut wastegate would produce infinit boost. I couldn't believe that a tmic would be that restrictive to only let 22psi through tops. You would hear complaints/removing the tmic would be the first upgrade people do.
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Old 09-26-2012, 01:45 AM   #60
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Quote:
Originally Posted by OC_Nooby View Post
I agree with your theory. I believe the tmic is restricting me some. BUT, a shut wastegate would produce infinit boost. I couldn't believe that a tmic would be that restrictive to only let 22psi through tops. You would hear complaints/removing the tmic would be the first upgrade people do.
Keep in mind that 22psi on the stock turbo won't flow near as much as 22psi on your (our) turbo, so the effect will be much smaller with a stock turbo.

I've only heard of one other car still using the TMIC with a turbo this size, and the builder was heckled for it. So it seems to me that upgrading the TMIC really is one of the first things people do when they put in a 3076-size turbo.

Last edited by NSFW; 09-26-2012 at 02:49 AM.
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Old 09-26-2012, 10:21 AM   #61
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TopSpeed has two cars that i can think of off the top of my head that are still running the stock sti TMIC with DOM 1.5's, and i want to say they were limited to around 25psi
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Old 09-26-2012, 11:33 AM   #62
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Well, all I can do is see if I have a leak in the wastegate. I'm really aiming for it not to be shut properly...

Otherwise I need a FMIC kit. Which will cost me more money yay.
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Old 09-26-2012, 05:57 PM   #63
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Quote:
Originally Posted by amalgrover View Post
TopSpeed has two cars that i can think of off the top of my head that are still running the stock sti TMIC with DOM 1.5's, and i want to say they were limited to around 25psi
USDM 04-07, USDM 08+, or JDM V7? Also, an ATP 3076 is larger than DOM 1.5
Quote:
Originally Posted by OC_Nooby View Post
Well, all I can do is see if I have a leak in the wastegate. I'm really aiming for it not to be shut properly...

Otherwise I need a FMIC kit. Which will cost me more money yay.
What about Process West, TurboXS/Hyperflow, or Spearco TMIC?
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Old 09-26-2012, 06:47 PM   #64
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Originally Posted by BlazeRex View Post
USDM 04-07, USDM 08+, or JDM V7? Also, an ATP 3076 is larger than DOM 1.5

ATP 3076 = 52lb/min -- 76mm compressor/60mm turbine wheel
Dom 1.5XT-R = 49lb/min -- 71mm compressor/ 56.5mm turbine wheel


the ATP 3076 is BARELY bigger...definitely not enough bigger to make what i posted irrelevant.


also, the ones i was refering to were both 2011 STI's. to further support what i posted, i had a guy a while back running an FP Red (65lb/min) on a stock 04 STI TMIC @ 25psi. my point was that while the stock TMIC may be restricting flow, with the wastegate held closed, there is no reason he shouldn't have seen more than 22psi. because, while actual airflow may not be increasing (MAF volts) and post intercooler charge temps may be significantly higher running more CFM than the intercooler can support, the boost pressure should still rise above 22psi with that turbo.

at least that is my opinion...

Last edited by amalgrover; 09-26-2012 at 06:55 PM.
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Old 09-26-2012, 09:12 PM   #65
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Umm in 5th gear I was able to get 25psi doing a 5th gear pull. What does that say? So it can over boost but why can't it go when I do a proper 1-4 pull?

Tune was safe, Timing is not aggressive, Meth with 94 oct, 11.2 A/F

Still haven't looked into the wastegate yet (soon!).
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Old 09-26-2012, 09:34 PM   #66
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well, you may or may not be able to get over 22psi in 1st or 2nd. those gears are alot harder to get higher boost in, but you should be able to see your target boost in 3rd-5th.
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Old 09-26-2012, 10:13 PM   #67
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Yeah, do a 4h gear 2500rpm to reline pull and see what boost you get, not just a 1-4 pull.

3rd if your car has a 5 speed.
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Old 09-26-2012, 10:26 PM   #68
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^ this
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Old 09-26-2012, 10:39 PM   #69
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+1.....,
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Old 09-27-2012, 12:20 AM   #70
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Quote:
Originally Posted by BlazeRex View Post
Yeah, do a 4h gear 2500rpm to reline pull and see what boost you get, not just a 1-4 pull.

3rd if your car has a 5 speed.
I did a 5th gear pull from 3k to redline (have a 6 speed). I'm pretty positive if the wastegate was wired shut id go a lot higher without any issue.

Also worth noting if I do a 1-5 pull the over boosting is very minimal, if I do a 5th gear pull it overboost more. I say overboost but probably thats the actual boost level I should get in all gears because the boost controller is probably set for more then 22 psi but I cant seem to get higher then that.
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Old 09-27-2012, 12:25 AM   #71
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as said, i would visually inspect the wastegate and perform the test that NSFW suggested.
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Old 09-27-2012, 12:36 AM   #72
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as said, i would visually inspect the wastegate and perform the test that NSFW suggested.
I will do that very soon! Just haven't had a chance.
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Old 10-03-2012, 12:47 PM   #73
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I can get 22psi in 1st gear by redline, but the needles move VERY fast and you have to pay attention. 2nd gear on, 22psi is not a problem if you are rowing the gears. Check for exhaust leak, the stacked spacer thing sometimes can leak if you aren't careful to install and tighten it.
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Old 10-14-2012, 08:12 PM   #74
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I can get 22psi in 1st gear by redline, but the needles move VERY fast and you have to pay attention. 2nd gear on, 22psi is not a problem if you are rowing the gears. Check for exhaust leak, the stacked spacer thing sometimes can leak if you aren't careful to install and tighten it.
I can't make 22 psi with the wastegate wired shut in first gear (maybe 18psi then it increases with each gear change). I was able to finally get the downpipe off and take pictures. I'm not sure.

Also can't remember if I mentioned this but I can easily overboost to 2 bars in a higher gear. So saying the TMIC can't flow it sounds odd? Or am I looking at this the wrong way.

pics:





The last two pictures show a shiny surface on the left of the seal on the turbo side and blackish on the right side. Kinda tells me its slightly open on the right side. Why else would you have black deposit on one side and not the other?
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Old 10-15-2012, 01:44 AM   #75
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That is suspicious, I agree.

Try sending those pics to ATP, see what they have to say...
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