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Old 03-25-2015, 02:16 AM   #1201
redprzdent311
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Litte red - best for street
Velocity stack - best for strip

When do the BBS's go on!
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Old 03-25-2015, 08:56 AM   #1202
xluben
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Quote:
Originally Posted by redprzdent311 View Post
Litte red - best for street
Velocity stack - best for strip

When do the BBS's go on!
You may be right. We'll see.

No idea when BBS will go on. Possibly never. Just snowed again last night. LOL.
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Old 03-25-2015, 09:58 AM   #1203
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what jesus would do


what would xluben do?
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Old 03-25-2015, 04:18 PM   #1204
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Sorry, I don't walk on water. Unless it's a frozen lake, then I could walk on that...

Here are some more photos of the filters.













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Old 03-26-2015, 10:27 AM   #1205
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I tried on the intakes last night. Didn't get anywhere testing them though.

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Old 03-26-2015, 03:05 PM   #1206
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I like the fine mesh. Just cool you can see the compressor fins imo lol, not sure how it would affect flow compared to the others though. Let us know how they test out!

Also, how is the daily drivability with the side exit exhaust?
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Old 03-26-2015, 03:14 PM   #1207
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Quote:
Originally Posted by jwong1208 View Post
I like the fine mesh. Just cool you can see the compressor fins imo lol, not sure how it would affect flow compared to the others though. Let us know how they test out!

Also, how is the daily drivability with the side exit exhaust?
I think the mesh one will probably be the best flow besides running it completely open. I don't want to try out either of those options until the roads are a lot cleaner though.

The side exit exhaust is quite loud on cold start. When the idle is high, it is much louder than your average exhaust. Once the car is warm and the idle drops down, then the car isn't much louder than your average fart can exhaust.
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Old 03-26-2015, 03:32 PM   #1208
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You'd be surprised how much that mesh will hold things back
My mesh screen was a full 2 psi back to back on my 68. It also breaks down super quick. At least the one I had. The turbo tried to suck it in even when it was super tight. Different screens but still looks similar.


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Old 03-26-2015, 04:26 PM   #1209
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Compared to what? Open inlet or a filter?
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Old 03-26-2015, 05:52 PM   #1210
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Quote:
Originally Posted by xluben View Post
Compared to what? Open inlet or a filter?

Correct vs no inlet and on wastegate spring only so the ecu wasn't trying to mess with it.

I made a intake bet never tested it outside of one pull before I took it back off.


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Old 03-26-2015, 11:59 PM   #1211
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Are we voting? I like the short one with the hole in the middle. It looks like it could be a fog light. I'd be too afraid to drive around with just a screen.
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Old 03-27-2015, 12:29 AM   #1212
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Quote:
Originally Posted by Shortpersonbk View Post
Correct vs no inlet and on wastegate spring only so the ecu wasn't trying to mess with it.

I made a intake bet never tested it outside of one pull before I took it back off.


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That's disappointing that even the mesh hurts flow that much. A large filter may actually flow better than the mesh simply due to the larger area for air to flow through the filter media. I do think the open inlet will be the best, especially with an unobstructed forward facing setup like this.

Quote:
Originally Posted by blk05wrx View Post
Are we voting? I like the short one with the hole in the middle. It looks like it could be a fog light. I'd be too afraid to drive around with just a screen.
I am hoping that either the KN or the other short one will be decent. Or even better, the honeycomb one (but I am doubting that). My fear is that I'll find that all the small filters are terrible and I really need to run a big giant cone to get performance anywhere near an open inlet.
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Old 03-27-2015, 12:29 AM   #1213
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its not a hole, its just a small cone i think

the big cone isn't so bad looking as expected. maybe get the fog cover and cut them to fit around it, do you need a cone that big? is there one smaller but bigger than the others?

regardless, i think you should spray the polished/chrome finishes black. less attention. wish your cold side was black too for ultimate stealth. next time
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Old 03-27-2015, 12:31 AM   #1214
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Quote:
Originally Posted by Jive Turkey View Post
its not a hole, its just a small cone i think

the big cone isn't so bad looking as expected. maybe get the fog cover and cut them to fit around it, do you need a cone that big? is there one smaller but bigger than the others?

regardless, i think you should spray the polished/chrome finishes black. less attention. wish your cold side was black too for ultimate stealth. next time
Yeah, it is an inverted cone. I have two with that style. One is longer than the other. I'm still not sure how big I will "need". That's what I need to find out. Blacking out the chrome and silver is a good idea. I could do that once I settle in on what I want. Wouldn't be hard to take the compressor cover off the turbo and paint that too.
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Old 03-27-2015, 12:32 AM   #1215
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New rig shot from tonight.

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Old 03-27-2015, 05:36 AM   #1216
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Quote:
Originally Posted by xluben View Post
That's disappointing that even the mesh hurts flow that much. A large filter may actually flow better than the mesh simply due to the larger area for air to flow through the filter media. I do think the open inlet will be the best, especially with an unobstructed forward facing setup like this.




Forward facing and a velocity stack would prob show the best gains.

I believe a large quality filter will be much better then the mesh due to surface area also though when it comes to protecting things.


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Old 03-28-2015, 02:27 AM   #1217
xluben
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Here are the results from my intake filter testing.

Quote:
Originally Posted by xluben View Post
I tested the following setups tonight:



The car is a 2002 WRX with a built 2.5L motor and 2012 STI 6MT. It is running a PTE 6266 Gen 1 in a fog light mounted location with an open exhaust dump out the fender. This is the same tune that I previously posted results for. It was a little colder tonight so both boost and power were slightly up from previous charts. The car is running a manual boost controller and the setting was not changed at all. It was simply swapping filters.

Here are the results in Virtual Dyno:



Everything was kept as consistent as possible between runs (ie. back to back runs, same night, same tune, exact same location, etc), but road logs can always have variation. Even with that being said, I think it's clear that the Turbo Guard SV just does not flow as well as a pleated filter. Boost is down significantly. Midrange power and torque is actually pretty good, but the top end is close to 10% lower. The subsequent charts on time and IDC back this up as well.

I think this is to be expected. The surface area is nearly an order of magnitude smaller than the others and the filter media is as dense (or possibly more dense) than the others. This filter really only makes sense when space is the #1 requirement, but you still want good protection. If you had a forward facing turbo that was directly behind your grill, or if I was dead set on running a fog light cover, then this would be the way to go (at the expense of top end power).

The other 3 filter options all performed fairly similarly. Boost was similar, and torque/power are within what I would consider to be the measurement variation of Virtual Dyno pulls. It does appear that the K&N might be flowing slightly worse, but it's really had to conclude that for sure. The same could be said for the extra torque with the largest filter. It's a bit higher, but not by a huge margin, and the top end is very similar to the others.

The other two comparisons I did were 3k-7.5k time and max IDC. The results from these runs back up the Virtual Dyno results. The Turbo Guard SV is the obvious outlier. The others are all close enough that I don't think I could conclude one to be better than the other with a high level of confidence. A few pulls on an actual dyno might be able to better sort this out, but for my uses I think I would be fine with any of them.

Plot of RPM vs time from 3k to 7.5k:


Bar chart of the 3k to 7.5k times:


Bar chart of max IDC for each option:


I am still looking forward to trying out the Turbo Guard Screen as well as the Treadstone velocity stack with open inlet. These are what I would consider running for at the track. I am hoping the open velocity stack will be a solid bump up from any of these filtered options that would be for street use. I will probably do this testing later on once I have more time.
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Old 03-28-2015, 10:33 AM   #1218
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Very Nice Bug! Cannot WAIT to see what you do to this
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Old 03-28-2015, 05:06 PM   #1219
xluben
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The 04 STI BBS wheels are gone, and in their place is a set of black 17x9" +45 Enkei RPF1's with 255/40R17 Federal 595 RS-R's. Unfortunately I haven't been able to drive the car yet because the rear tires rub on the struts. I have ordered a set of 5mm spacers to help them clear.

The fronts look like they're poking a little, but it looks like camber is close to 0. If I dial in a degree or two of negative camber I think they should be fine. I think I may end up having to roll the rear once the spacers go on. Possibly the front too, but it might clear. I'm happy to be on a wider set of tires. Hopefully the weather warms up soon!





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Old 03-30-2015, 10:10 AM   #1220
xluben
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I have noticed that power drops off up top. I wasn't really sure what caused it, but when I looked back it appears to have started showing up sometime around when Fuji from NF and I advanced the cam timing by one tooth last summer. Prior to that the plots mostly showed power holding pretty flat out past 7k. This was on smaller turbos and lower power levels, so not a perfect comparison to now, but it seemed like something to look into. A little more info on the cam setup here:

Quote:
Originally Posted by xluben View Post
My car has single AVCS cams. The intake side has AVCS cam gears and AVCS cams (but are not functioning). The exhaust has NON AVCS cam gears and NON AVCS cams. To address the cam timing issue on the intake side we advanced the timing by one tooth. This will put the AVCS cams/gears approx where the NON AVCS would end up.

http://forums.nasioc.com/forums/show...8&postcount=30

If I went back a tooth and was fully retarded I could probably get some more top end back (this is how the car originally was running), but as-is it should be similar to if I had NON AVCS cams.
Last night Fuji and I re-timed it to be back to "normal". We moved it 1 tooth back more retarded. I did a quick pull before and after. Same location, same tune, etc, just the cam gear change and a couple hours of time. It looks like it did shift the power slightly to the right (maybe 400rpm or so). This caused the peak power to bump up despite slightly lower peak torque. It does still drop off up top, but it's holding a little better.

Last edited by xluben; 04-09-2015 at 02:07 PM.
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Old 03-30-2015, 10:14 AM   #1221
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Yeah that drop off is weird, my 62 gen 1 never did that even on a 2.5inch downpipe, and a trash fmic.

Is your intake choking it up top?


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Old 03-30-2015, 10:53 AM   #1222
xluben
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Quote:
Originally Posted by Shortpersonbk View Post
Yeah that drop off is weird, my 62 gen 1 never did that even on a 2.5inch downpipe, and a trash fmic.

Is your intake choking it up top?


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Yeah, I was thinking it could be intake. But then when I looked back at my old plots it did look like it was holding pretty well up top until some point last year, and ever since then the plots have all had the same shape. HP peak in the 5,500 to 6,000 range and then drops off to redline. This was the same shape for this turbo and the last turbo.

I do still think the intake could be part of it. Looking forward to trying out the open inlet at some point .
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Old 03-30-2015, 11:19 PM   #1223
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I did a few quick 50-100mph pulls tonight and the cam timing change seems like a decent improvement over the 3.9sec range that I had been running.

50-100mph:
Pull #1: 3.65 sec
Pull #2: 3.74 sec
Pull #3: 3.67 sec

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Old 03-31-2015, 08:57 AM   #1224
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Here's a photo of the car from yesterday afternoon (stock wheels back on):

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Old 03-31-2015, 09:50 AM   #1225
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You'd never know anything is going on under the hood of that car if you saw it from the left or the back.... and based on that dyno if you drive it around under 3000 rpm it looks about as fast as a base model Impreza too, ha ha.
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