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Surge On -7's At Partial Throttle

32GTRB

By 32GTRB,
in Engines & Forced Induction

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32GTRB Proficient

32GTRB

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Hi guys, recently got my car back from being tuned. Running -7s, built motor, bosch 023 and 1000cc injectors. Boost controlled through an evc6 (not tuned for rpm/throttle) and tuned for max of 22psi with adj cam gears (stock cam) and making 340rwkw.

Im currently experiencing really bad surging at partial throttle in the high gears whilst under light boost (3-4psi) and also quite bad spiking (regularly see peaks of 24.6psi). To put it technically, its going shhh-tututututu whilst under boost partial throttle

I also have an aftermaket "twin turbo pipe" with longer piping before they merge. My Wastegate boost source is also tee'd off this pipe.

Any ideas what could be causing this? Is it likely to be the tune? Also is it ok to expect that the EBC would be tuned to take advantage of its full capability (i.e. Tuned for speed/rpm/throttle as well as just max boost/offset)? I was charged $150 to tune the ebc on the dyno in addition to tune costs

Edited by Jaeyon
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Hadouken Grand Master

Hadouken

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What front pipe and dumps do you have?

Do you have inter cooler hard pipes?

The shuffle shouldn't be that bad. it happens occasionally to me.

Does it happen when you are going up a hill at part throttle coming onto boost and just holding it there? But you can drive out of it if you put your foot a little further down?

32GTRB Proficient

32GTRB

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What front pipe and dumps do you have?

Do you have inter cooler hard pipes?

The shuffle shouldn't be that bad. it happens occasionally to me.

Does it happen when you are going up a hill at part throttle coming onto boost and just holding it there? But you can drive out of it if you put your foot a little further down?

blitz front pipes, standard dumps (not sure if port matched) and hks manifolds.

Only hard pipe which was changed was the "twin turbo pipe" so that section is now a bit longer (i.e. less rubber hosing). Still have stock intakes (with apexi pods) and running twin recirc turbosmart bovs

it happens even on a relatively level surface going part throttle whilst holding boost.i can drive out of it if i go full throttle but it seems to happen fairly regularly, more much than i'd expect.

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