Is my boost control OK?
28 December 2002, 07:21 AM
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I have a UK MY97 with full decat, VTA D/V, and Dawes. I get 1.05 bar, dropping to around 0.8 bar at around 5200rpm. Should my boost be tailing off that much?
28 December 2002, 09:12 PM
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Probably as expected. The boost does tend to taper off with the Dawes. You may have to run more like 1.2 bar midrange, and then it will drift down to about 1 bar at 6000 RPM if all is well. However, you may need to run a FCD (and therefore a knocklink) if you want to do this.
29 December 2002, 10:17 AM
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I wanted to run about 1.2 bar in the midrange as you suggest, but I hit fuel cut at around 1.1 bar. Is there any reason fuel cut is set so low on 97/98 MY's? Is the Dawes fuel cut lifter any good? I'll definately fit a knocklink if I'm going to be messing about with my fuel cut level.
[Edited by DreXeL - 12/29/2002 10:18:20 AM]
[Edited by DreXeL - 12/29/2002 10:18:20 AM]
29 December 2002, 11:31 AM
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I wouldn't go for the Dawes fuel cut lifter because the new fuel cut is not directly controllable - if there is one at all - depends on flow.
HKS FCD would be a better bet.
Earlier cars have lower fuel cuts.
Although the Dawes is fabled to hold boost to the top end, it usually does not, especially on a small turbo.
Even with many large turbos it doesn't where a 3 port solenoid with the correct ECU code could - because on the 3 port you can increase the maximum duty cycle at the top - you need more duty to hold top end compared with midrange boost.
HKS FCD would be a better bet.
Earlier cars have lower fuel cuts.
Although the Dawes is fabled to hold boost to the top end, it usually does not, especially on a small turbo.
Even with many large turbos it doesn't where a 3 port solenoid with the correct ECU code could - because on the 3 port you can increase the maximum duty cycle at the top - you need more duty to hold top end compared with midrange boost.
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