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Old 12-26-2003, 08:38 AM   #1
SGOSWRX
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Default Who's running a MBC on their STi?

I wanted to know how many STi owners are running a manual boost controllers on their STi's.
I have a Turboxs high performance boost controller just sitting in my garage. I took it off my 02 WRX. I want to put it on my STi , because I know how good it works. I shaved several tenths off my 1/4 mile time using it on my 02 WRX (That was running stock boost levels)

So for anyone that is using one on their STi.
How much boost are you running?
Any problems?
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Old 12-26-2003, 11:23 AM   #2
horshack
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I have the same set up, installed it yesterday, will tune the controller today hopefully.

Want to run 16-17 psi, right on the edge of over boost!
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Old 12-26-2003, 11:28 AM   #3
GTR STI
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works great. Much faster spoolup at stock levels.
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Old 12-26-2003, 11:52 AM   #4
DISCOPOPE
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ive thought about running the dual mbc from turbo xs.
and setting the primary to valet boost.
then again ive thought about painting my self metalic gold and running through the holiday parade naked, shouting out cure lyrics....
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Old 12-26-2003, 11:55 AM   #5
horshack
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other than running naked in the streets, the dual stage controller's are good once you have engine management that can switch from a pump gas to a race gas program, thus switching to higher boost levels, if the turbo can support it.
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Old 12-26-2003, 01:14 PM   #6
DISCOPOPE
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Quote:
Originally posted by horshack
other than running naked in the streets, the dual stage controller's are good once you have engine management that can switch from a pump gas to a race gas program, thus switching to higher boost levels, if the turbo can support it.
yep with my car in near stock state, i see no apparent need for a dual stage other than the bad %$@ feeling of having that red rocker switch
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Old 12-26-2003, 01:17 PM   #7
DISCOPOPE
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correct me if i am wrong, but as i understand it, for rwd drag cars, they use a lower boost setting for launch, then kick it up after the hook up..
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Old 12-26-2003, 03:11 PM   #8
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hpbc != dual mbc.

the hpbc has 2 types of boost control, but doesnt have a switch.

ps- i am running it and like it a lot. helped with boost cut in the summer, but since its gotten cold, nothing will stop the beast that is boost cut.
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Old 12-28-2003, 05:07 PM   #9
pierceman
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who makes the best controller, in your opinion for a modded sti?
MAtt
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Old 12-28-2003, 05:13 PM   #10
horshack
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OK,

Put my TurboXS HPBC on yesterday and tuned it.

Holding 16-18 psi depending on open or closed loop.

Boost comes up faster and harder now.

I love it!

Last night at 36 degrees outside, I hit over boost and fuel cut at 21 psi. So the HPBC does NOTHING for lower air temps and over boosting.
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Old 12-28-2003, 06:09 PM   #11
Wombat North
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Quote:
Originally posted by horshack
OK,


Last night at 36 degrees outside, I hit over boost and fuel cut at 21 psi. So the HPBC does NOTHING for lower air temps and over boosting.
That's why I run a HKS boost controller with a map sensor. Although any good EBC will do OK
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Old 12-28-2003, 08:48 PM   #12
jagcars26
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Quote:
Originally posted by horshack
OK,

Put my TurboXS HPBC on yesterday and tuned it.

Holding 16-18 psi depending on open or closed loop.

Boost comes up faster and harder now.

I love it!

Last night at 36 degrees outside, I hit over boost and fuel cut at 21 psi. So the HPBC does NOTHING for lower air temps and over boosting.

Thanks fr posting that,,,I was gonna try the HPBC,,now I wont


Rudy
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Old 12-28-2003, 11:08 PM   #13
copracer288
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Anyone tried this one: http://www.boostvalve.com/pricelist.html

Certainly a good price, $49 for the WRX kit.

Would there be a good reason to buy a higher priced unit?
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Old 12-29-2003, 12:07 AM   #14
Tuning Factory Inc.
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I would go with the Turbo XS HPBC or dual HPBC. I have seen a lot of different manual boost controllers and none have performed as flawlessly as the Turbo XS unit.
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Old 12-29-2003, 02:41 PM   #15
SGOSWRX
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Quote:
Originally posted by horshack
OK,

Put my TurboXS HPBC on yesterday and tuned it.

Holding 16-18 psi depending on open or closed loop.

Boost comes up faster and harder now.

I love it!

Last night at 36 degrees outside, I hit over boost and fuel cut at 21 psi. So the HPBC does NOTHING for lower air temps and over boosting.
Are you saying you hit 21 psi boost with the HPBC completely turned down. Or did you hit 21 psi with a warmer weather setting of 16-18 psi?

Can't you just adjust the boost down with the wrench so your not making that much boost when its cold?

On my 02 WRX, I would just turn the boost down a bit when it was cold. Then when the weather warmed up, I would adjust the boost up. I was able to keep the boost right where I wanted around 18psi in 4th and 5th gear.
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Old 12-29-2003, 03:39 PM   #16
DISCOPOPE
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the issue is, i believe, that you may have the mbc set at one bar, but the wastegate will not physically pass the volume of air required to prevent the creep in some tbe systems... ie catless.
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Old 12-29-2003, 05:11 PM   #17
horshack
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Quote:
Originally posted by SGOSWRX
Are you saying you hit 21 psi boost with the HPBC completely turned down. Or did you hit 21 psi with a warmer weather setting of 16-18 psi?

Can't you just adjust the boost down with the wrench so your not making that much boost when its cold?

On my 02 WRX, I would just turn the boost down a bit when it was cold. Then when the weather warmed up, I would adjust the boost up. I was able to keep the boost right where I wanted around 18psi in 4th and 5th gear.
Catless or TBE u can set the MBC to 10psi, it wont help boost creep at low temps - issue is not enough back pressure to help the wastegate. Nothing to do with the MBC - completely seperate issue altogether.
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Old 12-29-2003, 07:43 PM   #18
SGOSWRX
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Quote:
Originally posted by horshack
Catless or TBE u can set the MBC to 10psi, it wont help boost creep at low temps - issue is not enough back pressure to help the wastegate. Nothing to do with the MBC - completely seperate issue altogether.


So far with my with catless TBE I haven't had any problems with hitting the boost cut. But its only been 42 degrees on the coldest morning so far this winter.

So your are saying I can run the HPBC and it will not effect whether I hit the boost cut or not? If thats the case I might as well use it. I know it will give me a good increase in performance.
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Old 12-29-2003, 07:50 PM   #19
horshack
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Quote:
Originally posted by SGOSWRX
So far with my with catless TBE I haven't had any problems with hitting the boost cut. But its only been 42 degrees on the coldest morning so far this winter.

So your are saying I can run the HPBC and it will not effect whether I hit the boost cut or not? If thats the case I might as well use it. I know it will give me a good increase in performance.
True - the HPBC will increase performance, but will not prevent boost cut.

What TBE do you have? I had the BPM TKIII and now the B&B TBE, experienced boost cut with both.

Next cold morning, <45 degrees, under heavy load - such as passing on the freeway without downshifting, peg the gas, watch the boost gauge climb slowly then pop over 20 psi, hold for about 2-3 seconds and feel the WALL when fuel cut happens, and da blinky blinky of the CEL.
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Old 12-30-2003, 12:16 AM   #20
CoreyRED02
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I have had the TurboXS HPBC and XS catless SBE on for several months. The boost response is better, no noticeable boost creep, however I think the computer is compensating for it on the top end. I don't think it is advancing the timing as much as it would when it is controling boost. The reason I say this is I ran with just the exhaust and ran a 12.9. The next week I put the BC on and the turbo spooled faster actually making the car launch sideways. So the power is there at launch. However I never was able to get below 13.0 with the BC in place and my trap speed remained constant around 104 mph. I know on my WRX the BC alone dropped me around 3 tenths. I am going to try without the BC next spring to confirm my thoughts. Also, it appears that the turbo is actually not capable of holding much more than 13-14 psi at redline. The BC added about 1-1.5 psi at 7k. Looks like a new turbo is in my future. We'll see when some ECU's hit the market.

My $0.02

CoreySTi04
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Old 12-30-2003, 08:45 AM   #21
SGOSWRX
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Quote:
Originally posted by horshack
True - the HPBC will increase performance, but will not prevent boost cut.

What TBE do you have? I had the BPM TKIII and now the B&B TBE, experienced boost cut with both.

Next cold morning, <45 degrees, under heavy load - such as passing on the freeway without downshifting, peg the gas, watch the boost gauge climb slowly then pop over 20 psi, hold for about 2-3 seconds and feel the WALL when fuel cut happens, and da blinky blinky of the CEL.

I running a Godspeed downpipe and Greddy EVO catback. I get my boost gauge put on this week so I'll see how much boost I'm making.
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Old 12-30-2003, 08:55 AM   #22
SGOSWRX
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Quote:
Originally posted by CoreyRED02
I have had the TurboXS HPBC and XS catless SBE on for several months. The boost response is better, no noticeable boost creep, however I think the computer is compensating for it on the top end. I don't think it is advancing the timing as much as it would when it is controling boost. The reason I say this is I ran with just the exhaust and ran a 12.9. The next week I put the BC on and the turbo spooled faster actually making the car launch sideways. So the power is there at launch. However I never was able to get below 13.0 with the BC in place and my trap speed remained constant around 104 mph. I know on my WRX the BC alone dropped me around 3 tenths. I am going to try without the BC next spring to confirm my thoughts. Also, it appears that the turbo is actually not capable of holding much more than 13-14 psi at redline. The BC added about 1-1.5 psi at 7k. Looks like a new turbo is in my future. We'll see when some ECU's hit the market.

My $0.02


CoreySTi04
About getting sideways, the last time I went to the track I got completely sideways off the line and had to back off the gas. This was the first time I had ever gotten that out of shape on a launch. In my WRX I never got sideways ever. I would brake the tires loose really bad but I would never get sideways. Maybe its the torque or the power split in the STi. The STi might be putting more power to the back wheels than we think.
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Old 12-30-2003, 02:30 PM   #23
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It scared me the first couple times it got sideways. But I stayed on it and it straightened out, in fact I am still able to cut 1.7X's 60' times. It makes an impression on the guys who are staging behind you too.

CoreySTi04
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Old 12-30-2003, 11:25 PM   #24
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I ran a Joe P on my WRX for about a year with absolutely NO problems. I did have to adjust it for winter use up here in the frozen hinterland, but that was a quick, EZ job.

When I got my STi, I tried using it, but found that it caused mad boost creep, to the point of overboost cut. And no adjustment seemed to help. I even ran the boost level down below stock levels, and it would STILL over boost in boost creep situations (like high-gear roll on). So I pulled it and will (im)patiently wait for the TSX engine management.

The link to the JoeP is: http://www.boostcontroller.com/index.php It is a good, solid, simple manual boost controller. The price is right, too.
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Old 01-01-2004, 05:38 PM   #25
Snax
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As I understand it. wastegate porting and a downpipe should cure the boost creep issue.
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