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Boost creep
http://www.gt4dc.co.uk/forum/viewtopic.php?f=1&t=7771
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Author:  Bazross [ Tue Aug 01, 2017 9:30 am ]
Post subject:  Boost creep

Will a full 3 inch exhaust from downpipe cause boost creep

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Author:  Nibbles [ Wed Aug 02, 2017 9:35 am ]
Post subject:  Re: Boost creep

Sometimes it does, sometimes it doesn't.

Author:  Bazross [ Wed Aug 02, 2017 11:25 am ]
Post subject:  Re: Boost creep

I'm reading about restrictor plates if it happens does that not defeat the object of a 3 inch system
And if needed where do they fit into the system

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Author:  Kris [ Wed Aug 02, 2017 7:27 pm ]
Post subject:  Re: Boost creep

Restrictor plate inserted between downpipe and first section of exhaust.

As Nibbles says, it's hit and miss whether or not a restrictor will be required with a DP and full 3" exhaust...

Author:  Bazross [ Wed Aug 02, 2017 7:40 pm ]
Post subject:  Re: Boost creep

Hmm what's the reason for setting it up front Kris why not mid section?
only asking as it is creeping and over boosting until it hits fuel cut
Saying that it's more pronounced morning and eve when it's cooler but it's definitely going to high
Baz

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Author:  Sirius [ Wed Aug 02, 2017 7:56 pm ]
Post subject:  Re: Boost creep

The front location is easier to access with the car on the driveway.

Author:  Bazross [ Wed Aug 02, 2017 8:14 pm ]
Post subject:  Re: Boost creep

[FACE WITH TEARS OF JOY][FACE WITH TEARS OF JOY] really that's it?

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Author:  Nibbles [ Thu Aug 03, 2017 12:05 am ]
Post subject:  Re: Boost creep

To my mind, big exhaust and restrictor is all the restriction of a small exhaust without the faster gas velocity to aid torque. Adding a restrictor makes the car drivable again, although the technically best way is improving wategate flow.

Author:  Bazross [ Thu Aug 03, 2017 11:41 am ]
Post subject:  Re: Boost creep

That may be the next step forward

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Author:  Bazross [ Thu Aug 03, 2017 1:01 pm ]
Post subject:  Re: Boost creep

Reading about this the supras and the rx7 both suffer from the creep and both use the restrictor plates as a remedy, I was of the same opinion as you as in its kinda pointless to open up your gas ways to choke em again
However it seems that in some way its not the strangle point as you would expect if what I'm reading is correct.
I don't know what to think of it I suppose a run on the dyno would be the test with /without the restrictor to prove one way or the other
I fitted a plate in ladt night and it reduced the boost to 13.5 psi and that plate was a home made at 2.25 inch I've made a couple's more today at 2.5 and 2.75 inch
And will try these today
Interestingly though the Rx7 boys all advocate putting the plate in the midpipe and not on the downpipe, any thoughts on this.?
Baz

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Author:  Bazross [ Thu Aug 03, 2017 5:23 pm ]
Post subject:  Re: Boost creep

Bit more of playing about removed the restrictor plates altogether and no boost creep but it's getting 15.5 psi on stock pipes no boost controller valve or any thing which is about 2 psi more than it did on its old exhaust
the interesting thing here is that with the KnN cone filter on and the exhaust it over boosts to about 18psi put my stock airbox and panel filter back on no overboost
So with that in mind the air intake absolutely has to make a difference and the panel filter is clean and not choked up with crud

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Author:  Nibbles [ Fri Aug 04, 2017 1:02 pm ]
Post subject:  Re: Boost creep

The standard panel filter is restrictive (6BHP on a standard car on our test) - but it's the filter not the airbox & intake that's restrictive.

Author:  Bazross [ Fri Aug 04, 2017 5:04 pm ]
Post subject:  Re: Boost creep

Nibbles wrote:
The standard panel filter is restrictive (6BHP on a standard car on our test) - but it's the filter not the airbox & intake that's restrictive.
Hi mate it's not the standard panel filter it's a piper cross foam high flow panel filter

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Author:  Nibbles [ Fri Aug 04, 2017 8:07 pm ]
Post subject:  Re: Boost creep

Might be worth checking for a mouse nest in the intake pipe :)

Author:  Bazross [ Fri Aug 04, 2017 11:36 pm ]
Post subject:  Re: Boost creep

Deffo make a huge difference put the KnN back on and it hit fuel cut again and peaked at 17.9 psi

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