Stock Boosting Behavior

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Feb 20, 2003 | 12:41 PM

DriftinS14

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Joined: Jan 2003

Posts: 229

From: Pismo Beach, CA

Car Info: 02 WRX, 06 A3

Stock Boosting Behavior

Hey guys, im pretty new to my WRX and I had a question about the stock boost behavior mine seems to show. In first year max boost is approx 10bls. In second gear its abour 12-13bls. I can only reach the max boost of 14.2 in 3rd or above gears. Even in 3rd, 4th and 5th the boost falls off as I reach higher rpms. Does this sound normal to you? I would like to have full boost in first and second gear as its pretty slow off the line with only 10lbs.

Thanks guys

Feb 20, 2003 | 12:57 PM

teiva-boy

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Joined: Nov 2002

Posts: 1,780

From: San Diego

Car Info: Boosted Geo Prizm

This is normal be design. To get full boost in all your gears, you'll have to add an aftermarket boost controller.

Feb 20, 2003 | 01:43 PM

ScoobyBoy

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From: bay area

wow, im surprised that you hit 14.2 pounds all together. i normally dont get past 13 pounds.

Feb 20, 2003 | 10:19 PM

DriftinS14

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Posts: 229

From: Pismo Beach, CA

Car Info: 02 WRX, 06 A3

Ya my apex boost gauge reads just a notch under 15lbs under full highway acceleration. So what cheap but affective boost controller do you guys suggest? I had a turbonetics one on my 240sx that had a nice design and seemed to work pretty well. I liked it cuz it came with a nice mount and adjusting was done by hand, not with a allen wrench or a screwdriver. You simply pulled the cap up, turned it to adjust, and just popped it back down to lock in place.

Feb 22, 2003 | 04:18 PM

cobraKLR

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If you want to make similar boost in all gears get an EBC (HKS and Blitz make good units) or buy a UTEC and use its closed loop boost control.

If you just want to turn it up get something along the lines of a TurboXS MBC.

Feb 22, 2003 | 10:24 PM

DriftinS14

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Joined: Jan 2003

Posts: 229

From: Pismo Beach, CA

Car Info: 02 WRX, 06 A3

I actualy had a turboxs MBC once. I dont like the design because they dont come with a mounting bracket and you have to use an allen wrench to adjust it. It didnt seem to control boost any better then my Turbonetics unit. Any other suggestions for MBC that are adjustable by hand, not using a tool?

Thanks guys

Feb 23, 2003 | 02:13 AM

blackwagonrx

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Posts: 479

From: Daly City

turbosmart or turboxs dual stage MBC is adjustable by hand, plus you'll be able to switch from 2 different boost settings from the cockpit.

Feb 23, 2003 | 02:18 AM

DriftinS14

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Registered User

Joined: Jan 2003

Posts: 229

From: Pismo Beach, CA

Car Info: 02 WRX, 06 A3

Ooooooh.. now that sounds nice...Where might be the best place to pick one up?

Thanks guys

Feb 23, 2003 | 03:02 AM

blackwagonrx

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From: Daly City

www.isrperformance.com for the turbosmart
www.turboxs.com for the turboxs

Mar 4, 2003 | 06:00 PM

#10

GM991

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factor boost settings

I did the 3/16 tee MOD and my boost gage reads about 10psi in 1st, 14.5 2nd, 3rd and 4th. Has anyone else had this happen with the 3/16 tee mod???
Don't get me wrong this is a good thing just wanted to know if anyone else got this from this mod.

GM991

Mar 4, 2003 | 06:48 PM

#11

ScoobyBoy

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Posts: 3,214

From: bay area

just watch out for some spiking. the 3/16 is known to spike. i had it for awhile, it spiked to near 16 pounds. i took it out already.

Mar 4, 2003 | 07:25 PM

#12

DriftinS14

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Joined: Jan 2003

Posts: 229

From: Pismo Beach, CA

Car Info: 02 WRX, 06 A3

Care to explain the 3/16 tee mod? Sounds interesting.......

Mar 5, 2003 | 04:19 AM

#13

GM991

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DriftinS14
do a search and you should be able to find out allll about it.
It's just changing a vaccum tee from 1/16 to 1/8th having to do with the turbo.

scoobyboy thanks for the heads up. I have a boost gage and I never have seen any spikes. It pins at 14.5-15 psi like I mentiond above put never any higher than that. What other mods do you have that might contribute to your spiking issues?? I'm installing an axal back muffler this weekend. I will have to watch the boost gage and see if acts any different.

GM991

Mar 5, 2003 | 08:20 AM

#14

cobraKLR

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Re: factor boost settings

Quote:

Originally posted by GM991
I did the 3/16 tee MOD and my boost gage reads about 10psi in 1st, 14.5 2nd, 3rd and 4th. Has anyone else had this happen with the 3/16 tee mod???
Don't get me wrong this is a good thing just wanted to know if anyone else got this from this mod.

GM991

This is to be expected. The only way to get the same boost numbers in each gear is to run an EBC or an ECU with closed loop boost control. The higher gear you are in the more load the engine is under thus generating more exhaust energy at the same RPM - which causes you to run higher boost in higher gears. The stock restrictor somewhat masks this problem.

Also, this is not boost spiking. Boost spiking is when your boost level goes above the target value before settling down at the desired level.

Mar 5, 2003 | 10:14 AM

#15

jriggs

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go to scoobymods.com and look under the WRX section....you'll find the mod for the 3/16 hose coupler in there. they mention notion about spikes....give it a shot!!! later, riggs

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