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Old 07-03-2009, 03:29 PM   #1
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Default Boost Control w/2871 1.9L and mspnp ebc

So I am discovering that no matter what I do I am getting boost creep, up to 17psi on my built 1.9l w/ a gt2871 internally gated (3" dp, custom log mani)

No matter what I set the ebc settings to in ms if I down shift and go WOT it hits 15psi instantly and sometimes creeps a couple psi above that. If I just roll on the throttle sometimes it will hold at 7psi (wastegate) or creep to 9-10

I don't want to loosen the wastegate up and lose the low end response, should I be thinking of porting the wastegate hole in the turbine housing? Any ideas would be great as this high boost **** will literally kill me at the track
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Old 07-03-2009, 03:31 PM   #2
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Welcome to the joys of IWG. you need to convert to EWG or port your wastegate.
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Old 07-03-2009, 03:33 PM   #3
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Welcome to the joys of IWG. you need to convert to EWG or port your wastegate.
I wish someone would have told me long ago that IWG and 300whp was a bad idea :P
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Old 07-03-2009, 03:42 PM   #4
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It can be done though. Just not ideal. Send me your turbo and we will port it at no charge.
Stephanie
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Old 07-03-2009, 04:08 PM   #5
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You motor is built, just tune for 17 psi.
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Old 07-03-2009, 05:53 PM   #6
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It can be done though. Just not ideal. Send me your turbo and we will port it at no charge.
Stephanie
begi ftw,

buying my 2560 from them hehe
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Old 07-03-2009, 08:53 PM   #7
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IWG or EWG is something I'm on the fence about.

I thought I was set on going w/a 2560 because everybody's all jizzy about it, but with the S4 on a '99 and 3" exhaust, I'm pretty sure I can get the spool I want w/a 2860, and run a bit less boost overall for the power I want... which hopefully happens around 15psi... which means a ported IWG is probably sufficient, as that much boost will be on EBC, and 90% of my driving will be down around 7-8psi, or whatever it takes to get 200whp.

DC, can you screen-shot a datalog to include spool data.

Steph, how much more is the EWG option on the S4 and do you guys have a matching DP... I can't find the option on the website, although I do find a picture of an S4 mani w/an EWG flange.
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Old 07-03-2009, 09:04 PM   #8
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just tune for 20 psi and be done with it. Its not like your like me and the boost spikes lead to a ecu shutdown cause the map sensor cant read that high god i need to get the 5 bar sensor. lol Or get a weaker Wastegate on there.
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Old 07-03-2009, 10:11 PM   #9
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FWIW I am running a 2871 with a BEGI ported IWG and a 12 psi IWG actuator. I have a 3" exhaust (Enthuza) and a separated gases downpipe (BEGI). I have the .64 A/R turbine housing. I am not having boost creep problems at either a 13 psi set point or a 20 psi set point.

I am running a hybrid EBC/MBC setup but the way I am using it probably has little to do with the steady boost levels.

Take Steph up on her offer, or since you have a built motor just let it creep as suggested above. The latter option is easier and probably more fun.

I think you probably have something wrong with the EBC though. Are you sure it is all installed correctly? If you set it to 100% DC across the board, it should just go up in boost until you hit the boost limiter. If it does not, something is definitely wrong.
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Old 07-04-2009, 01:24 PM   #10
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Steph since I'm in Canada I don't think sending my turbo half-way around the world to get it ported is a good idea, I appretiate the offer though.

The problem with running this much boost guys is that when I track the car this will not work. It literally will be to fast for the course we run, I only need 10-12psi and I will dominate my class like last year, 20psi is just to much for the track (with the tires and brakes I have anyways)

I'm going to double check that ebc today because maybe I did screw it up somehow.

Sam: my spool is't anything special actually, its either 7psi at 3500 or 15psi at 3500 depending on how I accelerate (downshift and wot or roll on onto it).
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Old 07-04-2009, 01:50 PM   #11
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You probably know this, but just to be sure, when you check your EBC at 100% DC, SET YOUR BOOST LIMITER OR YOU WILL PROBABLY BLOW UP YOUR MOTOR. Even though you have a built motor, the GT2871 can make a lot of boost.

At 100% DC it should just build boost until you hit the boost limiter, as if the wastegate is not connected at all to the post-turbo charge piping (pre-throttle body).
At 0% DC it should work like there is no EBC and the wastegate is just connected directly to the post-turbo charge piping (pre-throttle body).
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Old 07-04-2009, 02:48 PM   #12
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Internal gates are just dumb, I wish I had known what I knew now before I ordered 2-years ago. I can't make less than 15psi

Quote:
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It can be done though. Just not ideal. Send me your turbo and we will port it at no charge.
Stephanie
I requested that you guys do this to my turbo in the love note I included with my package.
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Old 07-04-2009, 02:53 PM   #13
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Haha ya I know ZX- thanks anyhow.

I've been playing around with it letting the wife drive and f I set the targets for low it kinda works lol.

I def need to port this turbo though, oh ya 20psi feels pretty good but makes Z06 owners mad :(
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Old 07-04-2009, 03:08 PM   #14
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Originally Posted by dc2696 View Post
Haha ya I know ZX- thanks anyhow.

I've been playing around with it letting the wife drive and f I set the targets for low it kinda works lol.

I def need to port this turbo though, oh ya 20psi feels pretty good but makes Z06 owners mad :(
I run 15psi on the street and have OBP set at 18psi. Its pretty retarded at 18psi, like another car. Apparently I'm still in the efficiency range. OBP saved my motor a couple times.
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