N75 or wastegate

**leighaus** · 15-05-2013, 02:50 PM

hmm.. maybe my tuner doesnt know his arse from his elbow and got confused... im guessing im hitting the cut from the tune then.. ill leave it as is with the MBC as it runs quite nicely. I fully disconnected the N75 and got no CEL or limp and its even running a bit smoother.

So im pretty happy knowing that bug racer. cheers.

**leighaus** · 16-01-2014, 09:40 AM

After running a mbc for ages on 15psi ( any higher caused spikes and boost cut) I got super sick of the surging and part throttle issues.. ordered a vanilla n75 from ecs. Installed it ...... Back to 9 psi.. I want expecting that. Given I thought the n75j was incompatible and my old n75 had died..

More investigating required i guess... unplugging the new N75 with it all still plumbed still yields 5.5ish psi.

**leighaus** · 16-01-2014, 12:29 PM

after reading this : Golf not making full boost

im starting to think maybe i have a bad tune?

**h100vw** · 16-01-2014, 07:50 PM

Originally Posted by leighaus

after reading this : Golf not making full boost

im starting to think maybe i have a bad tune?

Adjust the actuator up so it makes a touch over 6PSI and see what happens. Assuming that you are convinced that there's no boost leaks at all.

I am doubting the tune is your problem. Software can't change over time, inputs and hardware may.

Gavin

**leighaus** · 16-01-2014, 10:21 PM

The tune has never worked with an n75 running, only an mbc which in a way is only a manual boost request. Not ecu based.
If I can hold 15psi with an mbc I don't have a spongey wg or boost leak .

I'll try increase the wg as suggested

**h100vw** · 16-01-2014, 11:04 PM

Originally Posted by leighaus

The tune has never worked with an n75 running, only an mbc which in a way is only a manual boost request. Not ecu based.
If I can hold 15psi with an mbc I don't have a spongey wg or boost leak .

I'll try increase the wg as suggested

Don't go silly, 2 turns will be plenty.

Gavin

**leighaus** · 20-01-2014, 12:06 PM

Made 0 difference gav.... The front nut is only may 3-4 threads from the end of the thread in the wg end.

**h100vw** · 20-01-2014, 08:26 PM

So you effectively shortened the rod, correct? Wound the nut closest to the canister closer first. Then the one on the end to lock it up again.

There's no way if you did this, there'd be no change. I can't think of an explanation why that would be. it doesn't make sense to me.

gavin

**Bug_racer** · 20-01-2014, 08:44 PM

Originally Posted by leighaus

The tune has never worked with an n75 running, only an mbc which in a way is only a manual boost request. Not ecu based.
If I can hold 15psi with an mbc I don't have a spongey wg or boost leak .

I'll try increase the wg as suggested

Do you even have a tune ?

You can raise the boost to the turbo limits with a MBC .
Only issue is as you raise it the ECU throws more fuel in .

**leighaus** · 21-01-2014, 03:47 PM

Originally Posted by h100vw

So you effectively shortened the rod, correct? Wound the nut closest to the canister closer first. Then the one on the end to lock it up again.

There's no way if you did this, there'd be no change. I can't think of an explanation why that would be. it doesn't make sense to me.

gavin

yes gav, essentially shortened the rod, which in turn starts to open the exhaust valve.

Makes no sense to me either.. I might contact the tuner... bit of a pain in the arse tho (long story).

Originally Posted by Bug_racer

Do you even have a tune ?

You can raise the boost to the turbo limits with a MBC .
Only issue is as you raise it the ECU throws more fuel in .

yes, Viezu tune. approx 12 months ago (current owner).