T2 MSW Posted September 30, 2007 Share Posted September 30, 2007 Just looking for some others input into this one. I have an inconsistency in by Defi Boost gauge and my Greddy boost controller. Been tuning the boost controller this evening and was recording the boost on the Defi whilst watching the boost controller. Got a setup that almost holds a steady 1.2 bar. Then was playing back the Defi run and whilst the peak on the Greddy was 1.19 bar the defi was showing 1.3 bar. Which should I be trusting? They are both plumbed into the same source off the fuel presure regulator. Quote Link to comment Share on other sites More sharing options...
merckx Posted September 30, 2007 Share Posted September 30, 2007 You could err on the side of caution and assume the Defi is correct. Or assume an average value . Quote Link to comment Share on other sites More sharing options...
steb9780 Posted October 1, 2007 Share Posted October 1, 2007 I am sure I read somewhere that gauges will always have an element of safety built into them. So they may overread slightly. As said before the safest option is to trust the defi. Quote Link to comment Share on other sites More sharing options...
NITO Posted October 1, 2007 Share Posted October 1, 2007 In my experience the Defi boost gauge always over reads by (10kpa)or 0.1bar. I've compared the Defi meters to lots of other devices, map sensors on ecu's etc and they always consistently over read by 0.1 bar. I always tended to trust the HKS EVC I used as opposed to the Defi meter for setting boost etc although the meter is good for warnings but bear in mind that it is over reading slightly. Regards Nito Quote Link to comment Share on other sites More sharing options...
T2 MSW Posted October 1, 2007 Author Share Posted October 1, 2007 Sounds good to me, ill go with the defi with the knowledge that the boost is somewhere round 1.1 bar. Cheers guys Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 1, 2007 Share Posted October 1, 2007 I wouldn't trust a peak reading, you may find that they correlate with each other normally but on the spike when both turbos reach full boost, one took it's data sample at a slightly different time to the other and got a higher reading. Boost pressure is all over the place, not a nice steady level. Gauges and stuff have smoothing capabilities (low sample rate, averaging, or a good old fashioned fluid dampened needle) to make it readable. -Ian Quote Link to comment Share on other sites More sharing options...
NITO Posted October 1, 2007 Share Posted October 1, 2007 I'm referring to steady state boost, not peak readings in my post above. As Ian says, Peak readings are often far higher as its more sensitive to fluctuations/spikes than most other devices. The higher the boost you run the more exaggerated these peak spikes are, again in my experience! Rgds Nito Quote Link to comment Share on other sites More sharing options...
Sharpie Posted October 1, 2007 Share Posted October 1, 2007 FWIW My boost controller normally shows lower than my boost gauge. Quote Link to comment Share on other sites More sharing options...
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