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| gazman Member Since: 17 Aug 2015 Location: Liverpool Posts: 652   
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mine runs happily at 20 psi at the minute, ive had 21 to 22 but that's about 1.5b 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r |
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10th Nov 2017 7:43pm |
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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4785 
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It could be the maf sensor tripping out. This doesn't bring on the engine management light but does cut the power. One way of stopping it is a dual channel limit box. Much over 20 psi and the standard turbo becomes inefficient
 2002 90 Td5 Station Wagon
1990 Vogue SE Triumph Tiger Explorer 1200 Td5 90 Thread http://www.defender2.net/forum/topic50767.html Tdi 110 Thread https://www.defender2.net/forum/topic69562.html RRC Thread http://www.defender2.net/forum/topic54492.html Instagram http://www.instagram.com/george_grafton |
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10th Nov 2017 10:41pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8033  
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we used to run 25psi on Allisport tune Cheers
James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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11th Nov 2017 8:49am |
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| Welkman Member Since: 02 Nov 2014 Location: Essex colchester Posts: 326
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Thanks for the comments guys. It is analive turbo with the billet wheel etc. As of this morning it seems to be happy at 1.7 bar which is just over 24psi. I just want to work out the thoretical limit of boost on this turbo so I do not damage the thing. It also has an uprated map sensor so should cope.
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11th Nov 2017 10:45am |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2168 
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Boost is too high.
The standard turbo will put out 30psi max but ideally set at 18psi anymore and you get lag, even with an uprated MAP+raised boost limit or boost box. If you are running higher boost i suggest you use a boost controller/bleed vlave to properly control the boost as the standard (even forge) actuator is not up to the job of much past 20psi. MAFs are hit n miss, including genuine ones some will run gladly at 24psi some wont Edit Just saw youve an alive turbo. Is it Hybrid or VNT? Either way 22 - 24psi is the sweet spot any more and lag. |
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11th Nov 2017 1:01pm |
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| Welkman Member Since: 02 Nov 2014 Location: Essex colchester Posts: 326
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Hi again,
It is the hybrid turbo. Seems smooth at 1.7 bar but will knock it down a bit and see how it performs. |
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11th Nov 2017 2:31pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2168
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Still a touch too high. 22 is optimal for a hybrid,as I said best to use bleed valve or boost controller. Other wise you end up with "boost creep" which is not good!
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11th Nov 2017 2:44pm |
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| Welkman Member Since: 02 Nov 2014 Location: Essex colchester Posts: 326
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Thanks for that - could you explain the bleed valve or boost controller so I can understand how they work alongside the current setup?
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11th Nov 2017 3:19pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2168
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Basically its a little valve that sits in between the actuator and pipe, it bleeds off excess air so you get the correct boost.
Set the actuator to standard then adjust the boost controller up or down till you hit 22psi which is ideal for a TD5 hybrid, any more and it lags. More boost doest always mean more power/better running. |
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12th Nov 2017 3:41pm |
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