[Mk2] [Turbo] Rev 2 Turbo not holding boost to redline

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manuelk1
Posts: 70
Joined: Mon Jul 13, 2015 3:58 pm

[Mk2] [Turbo] Rev 2 Turbo not holding boost to redline

Post by manuelk1 »

Hi guys I wonder if someone can help.

I've got a rev 2 turbo with a CT20B turbo, de-cat, hks fcd, manual boost controller which is set at 1.0 bar of boost. However when under full throttle it hits 1 bar of boost but doesnt hold to the red line it dies down to between 0.8 and 0.9 bar. Any ideas why its not holding 1 bar to redline?

Cheers


Kieran
markstevieandmads
Posts: 2025
Joined: Mon Aug 05, 2013 8:18 pm
Location: Swindon, Wilts

Re: [Mk2] [Turbo] Rev 2 Turbo not holding boost to redline

Post by markstevieandmads »

Are u sure its a ct20b? Get a pic up
manuelk1
Posts: 70
Joined: Mon Jul 13, 2015 3:58 pm

Re: [Mk2] [Turbo] Rev 2 Turbo not holding boost to redline

Post by manuelk1 »

Not got a pic but 100% it's a ct20b mate
markstevieandmads
Posts: 2025
Joined: Mon Aug 05, 2013 8:18 pm
Location: Swindon, Wilts

Re: [Mk2] [Turbo] Rev 2 Turbo not holding boost to redline

Post by markstevieandmads »

Id say boost leak then
manuelk1
Posts: 70
Joined: Mon Jul 13, 2015 3:58 pm

Re: [Mk2] [Turbo] Rev 2 Turbo not holding boost to redline

Post by manuelk1 »

Will pressure check the system and report back, cheers buddy :thumleft:
markstevieandmads
Posts: 2025
Joined: Mon Aug 05, 2013 8:18 pm
Location: Swindon, Wilts

Re: [Mk2] [Turbo] Rev 2 Turbo not holding boost to redline

Post by markstevieandmads »

Also check the wastegate isnt fouling on the decat
manuelk1
Posts: 70
Joined: Mon Jul 13, 2015 3:58 pm

Re: [Mk2] [Turbo] Rev 2 Turbo not holding boost to redline

Post by manuelk1 »

no boost leak found. waste gate operating as it should and isn't fowling the down pipe!
cooper514
Posts: 98
Joined: Mon Jun 03, 2013 10:46 pm

Re: [Mk2] [Turbo] Rev 2 Turbo not holding boost to redline

Post by cooper514 »

Turn it up a bit more it will spike and come back down
robbie_742003
Posts: 1167
Joined: Wed Dec 15, 2004 7:50 pm
Location: Midlands

Re: [Mk2] [Turbo] Rev 2 Turbo not holding boost to redline

Post by robbie_742003 »

It's not holding for a reason, I'd investigate further before upping the boost, try to get it in somewhere. Any fault codes?
manuelk1
Posts: 70
Joined: Mon Jul 13, 2015 3:58 pm

Re: [Mk2] [Turbo] Rev 2 Turbo not holding boost to redline

Post by manuelk1 »

No fault codes atall found, it also over boosts past 1.2 bar at high speed when applying the throttle in 5th gear which leads me to believe it could be the mbc which isnt working correctly?
robbie_742003
Posts: 1167
Joined: Wed Dec 15, 2004 7:50 pm
Location: Midlands

Re: [Mk2] [Turbo] Rev 2 Turbo not holding boost to redline

Post by robbie_742003 »

manuelk1 wrote:No fault codes atall found, it also over boosts past 1.2 bar at high speed when applying the throttle in 5th gear which leads me to believe it could be the mbc which isnt working correctly?


Its possible, what boost controller are you using? 17.5 PSI is too much without cooling mods and other supporting mods and could result in damage mate.

Rob
manuelk1
Posts: 70
Joined: Mon Jul 13, 2015 3:58 pm

Re: [Mk2] [Turbo] Rev 2 Turbo not holding boost to redline

Post by manuelk1 »

It's a Mumsby developments mbc. It's set to 1 bar mate but as I say over boots at high speed in 5th.
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