Boost creep - looking for opinions

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Feb 18, 2013 | 09:23 PM

alexc

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Staging Lane

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Boost creep - looking for opinions

Twin turbo 2005 gto, stock ls2 with flipped truck manifolds and (2) T-04B (58mm) turbos behind the headlights with 2 tial 38mm wastegates set to 8 psi. Took it to get tuned and it gradually creeps up to 12-13 psi at 6-6.5k rpms.

Tuner shut the tuning session down and recommended a different wastegate position to optimize flow. Attached are some pictures but I wanted to hear from the ls1tech turbo gurus to see what you think. Also open to ideas on where/how to place the wastegates for optimum flow.

Driver side:

Passenger side:

Feb 18, 2013 | 09:54 PM

runsfromdacops

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You need to move the inlets of the gates to the out side of the curve not on the side. You can also help the gates work better if you do a teardrop the inlets

-alex

Feb 19, 2013 | 03:54 AM

smokeshow

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From: Detroit

What size exhaust housing? Too big and the exhaust won't build enough pressure to push the gate open.

Feb 19, 2013 | 11:29 AM

alexc

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Staging Lane

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Exhaust is dual 3 inch downpipes with v band clamps to the turbo housing to dual 3 inch exhaust with magnaflow mufflers
Edit: these are the turbos t04b-sh

http://www.uppcos.com/product_info.php?cPath=23_34&products_id=32

Last edited by alexc; Feb 19, 2013 at 12:07 PM.

Feb 19, 2013 | 12:20 PM

pwrtrip75

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From: Janesville, WI

What size hole is in the elbow where the flange is welded on? Pull the gate off and look inside the flange. Post a pic of it.

Feb 19, 2013 | 12:22 PM

runsfromdacops

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the gates need to be moved as they are just in a bad spot.

Feb 19, 2013 | 08:37 PM

LS1NOVA

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From: Minneapolis,MN

Just run more boost!

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Feb 19, 2013 | 09:33 PM

LS1NOVA

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Your saying 12 psi is too much? Come on, turn it up.

Feb 19, 2013 | 10:38 PM

#10

alexc

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Staging Lane

Joined: Sep 2005

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10.9:1 compression + crappy 91 fuel + no meth/e85 is a good reason for me lol. and the few dyno runs I did get in resulted in the upper 500's (I believe the rod bolts start to stretch 600+ in the ls2's) to the wheels before the tuner shut the session down. I know I'm delaying inevitable, I am seeing an aes390 in the future, but I would like to drive the car on low boost/stock motor while I save up for something nice.

If I blow up my ls2 before that I'll just follow the ls1tech crowd and get a junkyard motor with arp studs and 317 heads and call it a day lol!