Guest @di Posted August 24, 2010 Share Posted August 24, 2010 (edited) Hi I have a defi boost gauge, it shows 1.1bar on it, but on my boost controller HKS EVC-S it shows 0.9bar. On the idle the readings or same. It is just when i want to see how much boost i get, that is when value or different. The defi boost gauge and the boost controller are install on same vacuum house. Which one should i trust the defi boost gauge or boost controller?, Or why does it shows different? Thanks Edited August 24, 2010 by @di (see edit history) Link to comment Share on other sites More sharing options...
bodilx6 Posted August 25, 2010 Share Posted August 25, 2010 Depends on where they are connected to the vacuum system... Check here (scroll down a bit): http://www.max-boost.co.uk/max-boost/Gotchas_2JZGTE.htm Link to comment Share on other sites More sharing options...
David Reid Posted August 25, 2010 Share Posted August 25, 2010 There are also two in the back of the intake manifold which can be used, the boost controller should be connected to pre throttle to prevent controller wind up when manifold pressure cant reach target when the throttle is closed. (This is shown in all the instructions) I run boost controller Pre throttle, Boost gauge on inlet manifold. At wide open throttle both will or should read the same, for accuracy I would probably trust the boost controller. Link to comment Share on other sites More sharing options...
Guest @di Posted August 25, 2010 Share Posted August 25, 2010 (edited) Depends on where they are connected to the vacuum system... Check here (scroll down a bit): http://www.max-boost.co.uk/max-boost/Gotchas_2JZGTE.htm ok, the boost gauge and the boost controller are connected like that as shown http://www.max-boost.co.uk/max-boost/images/supra/intake/boost_gauge_pickup_point.jpg There are also two in the back of the intake manifold which can be used, the boost controller should be connected to pre throttle to prevent controller wind up when manifold pressure cant reach target when the throttle is closed. (This is shown in all the instructions) I run boost controller Pre throttle, Boost gauge on inlet manifold. At wide open throttle both will or should read the same, for accuracy I would probably trust the boost controller. ok maybe thats whats the problem is, what is pre throttle? hehe,, Edited August 25, 2010 by @di (see edit history) Link to comment Share on other sites More sharing options...
David Reid Posted August 25, 2010 Share Posted August 25, 2010 ok, the boost gauge and the boost controller are connected like that as shown http://www.max-boost.co.uk/max-boost/images/supra/intake/boost_gauge_pickup_point.jpg ok maybe thats whats the problem is, what is pre throttle? hehe,, Pre throttle = before throttle Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 25, 2010 Share Posted August 25, 2010 I'd trust neither and buy a proper certified large gauge if you are messing with modding turbo engines. A good known accuracy certified gauge is a lot cheaper than a detonated engine..... Link to comment Share on other sites More sharing options...
Guest @di Posted August 30, 2010 Share Posted August 30, 2010 Pre throttle = before throttle ok, where can i find the vacuum before throttle, so that i install the boost senor on that place,thanks. Link to comment Share on other sites More sharing options...
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