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Old 05-22-2012, 11:52 PM   #2026
xluben
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Peek-a-boo

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Old 05-23-2012, 02:54 AM   #2027
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MBC relocation mod? What if your knee accidentally spins it 10 turns around? I like. Show us the wiring!
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Old 05-23-2012, 03:20 AM   #2028
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Quote:
Originally Posted by vinz0r
MBC relocation mod? What if your knee accidentally spins it 10 turns around? I like. Show us the wiring!
That's ok, 1 psi is 16 clicks
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Old 05-23-2012, 08:41 AM   #2029
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10 turns would be quite a problem! I don't even know if it has 10 turns of adjustment. Luckily 10 turns would never happen by accident. I don't think you could even do more than 1 or 2 clicks (fraction of a psi) by accident. It's just not that easy to spin (it has a detent so it "clicks" as you turn it).

I've found it takes about 4 full turns to go from wastegate pressure (just over 20psi) to my desired peak of ~27psi. It is nice to be able to jump between those two whenever I want (although I never have turned it down in the past, so I don't know if I really will do that now...). I just figured it would be nice for the track in case I want to tone things down a bit on the fly.

Here's another lower shot:



I ran the vacuum lines across the engine bay and through the large grommet in the fender (along with all the other wiring I have done). Plenty of room in there. The MBC was mounted into a hole that was already existing under the dash. I don't know why it was there, but it was a perfect fit for the bolt.

I was a bit worried that the extra vacuum lines would cause problems, but I haven't noticed any issues so far. Spool and boost control seem to work just fine, but I would still like to pull a log to confirm. The only oddity is that you can hear the MBC venting air once the ball/spring opens up (as it should). It's just a slight hiss and by that time the EWG is open so it doesn't matter anyways!
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Old 05-23-2012, 10:29 PM   #2030
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Thanks for giving the relocation a shot and for sharing your results, Ben! Glad it worked out well for you. Yep, the MBC makes some funny noises after opening! Between the bleed hole and the nozzles inherent in the design, it definitely sounds funny.

- Matt

Last edited by GrimmSpeed; 05-23-2012 at 10:40 PM.
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Old 05-24-2012, 08:21 AM   #2031
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Thanks Matt! I'm happy to try new things, and I'm glad that it worked out well.
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Old 05-24-2012, 10:52 AM   #2032
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I also have GrimmSpeed's 3port-BCS + MBC sitting in boxes right now. I know you set them up on your WRX nicely, but do you know if it's possible on an Si-Drive model? If you tune it right for the S# mode, then what happens to lower boost thresholds in S and I?
I would also do the MBC relocation mod if I went that route. Thanks for the pics
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Old 05-24-2012, 11:15 AM   #2033
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I'm not real familiar with tuning the Si-Drive. What is going to change with each Si-Drive setting? If it's just peak boost, then there's not much of a point. You would just control that by changing the MBC setting. With the hybrid setup you would tune it so the MBC is controlling boost at WOT (therefore the Si-Drive setting wouldn't matter at all, only the MBC).
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Old 05-24-2012, 01:21 PM   #2034
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Si-drive remaps the throttle response and, with Cobb AP, changes peak boost as you've said. I don't remember the peak boost in I-mode. S is about 16.5psi peak, and S# is 19psi peak. I get spikes to slightly over 20 at times [Stage 2]

So I guess by going hybrid-BC, the Si-drive feature would have the same peak boost in all 3 modes but different throttle response? Not that I care about it anyways.
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Old 05-24-2012, 01:25 PM   #2035
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That's where I don't have quite the understanding to answer your question. I'm not exactly sure how it controls boost. I think it has to do with the throttle mapping. With the MBC, in conjunction with the Si-Drive, the throttle mapping would still be changing, but your peak boost would be set by the MBC. I think this would be a better question for your tuner.
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Old 05-24-2012, 01:55 PM   #2036
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Si drive can control boost because the S modes are mapped to something called "requested torque" and this is used to determine throttle plate opening %, wastegate duty cycle and target boost. Each S mode can ask for different boost and set a different wastegate duty cycle in order to hit it.

If you combine this with some other tables that control requested torque per gear, you can very effectively control boost with nothing more than a 3 port EBCS and proper tuning.

For the stock turbo 08+ STi E85 tunes I do, I generally setup S# to hit 23 psi in every gear and hold as much boost as possible to redline. I setup S mode to hit around 18 in 4th and a little less in lower gears. This amount is pretty nice for the street where 23 psi can be too much and you don't have to remember to disable TC so it doesn't come on. I tune I mode for economy and it only hits around 13 psi. Most people seem to really like this setup.

I've never really understood the benefit of a hybrid boost control setup. I feel like a good EBCS and a good tune work much better than anything else but I'll admit that I haven't spent a whole lot of time looking into it and I've never tried it myself.
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Old 05-24-2012, 02:03 PM   #2037
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Quote:
Originally Posted by WRXt4cy View Post
For the stock turbo 08+ STi E85 tunes I do, I generally setup S# to hit 23 psi in every gear and hold as much boost as possible to redline.
What size injectors do you have them run with this setup? How close to 23psi do they get at redline?
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Old 05-24-2012, 02:10 PM   #2038
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Originally Posted by CarverHouseRally View Post
What size injectors do you have them run with this setup? How close to 23psi do they get at redline?
I usually suggest 1000's or 1200's depending on what upgrade path they have planned.

The stock VF48 runs out of steam quickly. I usually don't see much more than 16.5 psi by redline at elevations around sea level. 23 psi is what it can spike to but down in the lower gears the engine winds out so quickly it doesn't get to spend much time at that much boost. The torque does really hit hard though
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Old 05-24-2012, 02:50 PM   #2039
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Well none of this applies to me....

BTW, mine's at about 27psi daily
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Old 05-24-2012, 03:08 PM   #2040
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Well none of this applies to me....

BTW, mine's at about 27psi daily
Lol you are running a balls-out setup and I can respect that.

I watched some of your YouTube videos and your car pulls very hard. Like many others, I'm very interested to see how long your tranny will take that kind of power before it ****s the bed.

I still owe you a 50 - 100 video/log from the Dom 3 RSTi I tuned @ 26 psi and when I get my hands back on it for some more tuning I will get one. With its lighter weight and 05 tranny, it pulls very quick as well.
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Old 05-24-2012, 03:15 PM   #2041
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Yeah, I'm curious to see how long it will last. I have a pretty big mound of midrange torque that will probably do it in. I'm curious to see some 50-100 videos from similar setups. My time seems to be hanging in there with a lot of bigger turbo's (although maybe not pushed as close to their limit as mine). I'm also thinking that my gearing might be a good match for the 50-100mph range.

I did line up for a few rolls against a built Dom3+E85 setup a while back when I was at lower boost. Our cars were pretty even, but mine killed his on spool. I think his might have pulled on mine a tad (when I was at that boost level), but unless he brake boosted a lot I would pull a car or two off the bat and he'd barely be inching back towards my bumper. Overall I'm very happy with my setup, but I'm always itching for more Need a new tranny first though...
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Old 05-24-2012, 03:38 PM   #2042
WRXt4cy
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Quote:
Originally Posted by xluben View Post
Yeah, I'm curious to see how long it will last. I have a pretty big mound of midrange torque that will probably do it in. I'm curious to see some 50-100 videos from similar setups. My time seems to be hanging in there with a lot of bigger turbo's (although maybe not pushed as close to their limit as mine). I'm also thinking that my gearing might be a good match for the 50-100mph range.

I did line up for a few rolls against a built Dom3+E85 setup a while back when I was at lower boost. Our cars were pretty even, but mine killed his on spool. I think his might have pulled on mine a tad (when I was at that boost level), but unless he brake boosted a lot I would pull a car or two off the bat and he'd barely be inching back towards my bumper. Overall I'm very happy with my setup, but I'm always itching for more Need a new tranny first though...
That's interesting. This particular RSTi has Lachute performance headers on it which really seems to help with low end torque and spool. For the size of turbo that it is, it really seems to spool fast.

The WRX gearing is pretty awesome when you have a bigger turbo and a lot of power. You can really stretch out the power without running out of gear so quickly. Do you planning on upgrading your WRX tranny or going with an STi tranny if it breaks?
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Old 05-24-2012, 03:48 PM   #2043
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With the 50-100mph time the spool doesn't really matter because everyone does them rolling and already at full spool at 50mph. I think the lighter weight will really help the RS put down a fast time.

I do like the longer WRX gears with this powerband, and I only imagine it getting better with more power. I'm still on the fence between a 6 speed or a built 5 speed. I think I'd prefer the built 5, but the 6 speed seems like the cheaper option and very reliable.
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Old 05-24-2012, 04:02 PM   #2044
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Quote:
Originally Posted by xluben View Post
With the 50-100mph time the spool doesn't really matter because everyone does them rolling and already at full spool at 50mph. I think the lighter weight will really help the RS put down a fast time.

I do like the longer WRX gears with this powerband, and I only imagine it getting better with more power. I'm still on the fence between a 6 speed or a built 5 speed. I think I'd prefer the built 5, but the 6 speed seems like the cheaper option and very reliable.
Sorry - I was talking about the better spool more in response to your pulls against a Dom 3 E85 car. I was saying that I think his headers are really helping the Dom 3 not be so laggy.

Yeah, a built 5 speed and a 6 speed is always a hard choice it seems.
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Old 05-25-2012, 08:14 AM   #2045
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Well, my brother decided to try out some NT05's. They went on his MS3 with stock wheels.









The car they're on:



I have Star Specs on my car, but he figured he'd give the Nitto's a shot. We'll be going to the road course next weekend to see how they do.
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Old 05-25-2012, 09:11 AM   #2046
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star spec is way better then the NT05. The only nitto worth buying is the NT-01 if you ask me
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Old 05-25-2012, 09:26 AM   #2047
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star spec is way better then the NT05. The only nitto worth buying is the NT-01 if you ask me
How long did you run the Star Specs vs. the NT05's? What did you use them for (drag, autocross, road course, street, etc)?

I've been using the Star Specs on the street for a while now, and I like them a lot, but they're not exactly cheap. The NT05's are over $200 less for a set, and they have great reviews overall. I think they're worth a shot. We'll both be going to the track with stickier tires for the first time, so it will be a big change from OEM tires for both of us.

He was looking at getting NT01's, but didn't want to use them for street tires. He was hoping to get a set of track wheels but ran out of time before our track day, so he decided the NT05's would be the best option for a street/track tire at a reasonable price.
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Old 05-26-2012, 10:40 PM   #2048
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I picked up the SPT exhaust (again) today. Put it on and did an oil change. I really, really like how the flared tips look. I think the SPT, Nameless (small tips) and Greddy are the best looking exhausts. The single wall, straight cut tips just don't do it for me. The other rolled or double wall exhausts (that aren't quite as pronounced as the SPT) look OK, but I don't think as good.

I was also reminded how good the SPT sounds! It's very, very quiet at cruise. Close to stock. Definitely a lot quieter than the Q300. It is considerably louder than stock when you get on it, but not excessive. The tone is always deep and sounds great. I'm really happy to have it back on. Also good news is that baby loves it!



While I had them off, I measured the stock vs. SPT midpipe. Stock is 2 1/4" and SPT is 2 1/2". SPT has the midpipe go straight into the muffler. Saves about a foot of piping and a 90 degree and a 180 degree bend. I'm assuming this would all add up to slightly better flow, but probably doesn't make that much of a difference (since cat back's don't really seem to matter).
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Old 05-27-2012, 07:40 AM   #2049
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While I had them off, I measured the stock vs. SPT midpipe. Stock is 2 1/4" and SPT is 2 1/2". SPT has the midpipe go straight into the muffler. Saves about a foot of piping and a 90 degree and a 180 degree bend. I'm assuming this would all add up to slightly better flow, but probably doesn't make that much of a difference (since cat back's don't really seem to matter).
Isn't the 2008+ hatch SPT exhaust supposed to be 3"? It does taper to 2.5" at the down pipe connection, but it's supposed to be 3" all the way back. When I had the SPT exhaust I measured it in a few places and got 3" (aside from the down pipe flange). What section of the mid pipe did you measure?

Is there a different exhaust and part # for the 2008+ hatch WRX SPT vs STI SPT?
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Old 05-27-2012, 09:05 AM   #2050
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The SPT is the exact same between the STI and WRX (08+ hatch). Definitely not 3". None of them are (including the single exit hatch SPT). This is my second SPT, one came off a WRX and one came off an STI. Same thing. The exhaust actually flares out at the flanges and gets wider. The only 3" section is the few inches after the midpipe and before the muffler.

Here's the stock image. You can see it doesn't "neck down" at the flanges.

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