SimonR Posted July 2, 2007 Share Posted July 2, 2007 I asked my local motorfactor ("anything you can buy on-line we can get for you") for a boost switch or hobbs switch and got a very blank look indeed. I feel a case of 'keep buying stuff off Ebay until you get lucky' coming on. Most grateful if anyone who has done it could save me time and cash by pointing me to a suitable adjustable switch to turn off the nitrous when the boost comes on. Ta. Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted July 2, 2007 Share Posted July 2, 2007 What ecu or system are you using to control nitrous? Progressive controller? Quote Link to comment Share on other sites More sharing options...
tooquicktostop Posted July 2, 2007 Share Posted July 2, 2007 I have this in my arm rest, one for NOS, one for boost, one for anti lag and the last for race fuel all linked to the AEM, I brought it from Demon Tweeks Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted July 2, 2007 Share Posted July 2, 2007 I have this in my arm rest, one for NOS, one for boost, one for anti lag and the last for race fuel all linked to the AEM, I brought it from Demon Tweeks That appears to be to turn it on, Simon wants a boost pressure switch to turn it off at a set boost level Quote Link to comment Share on other sites More sharing options...
Tourniquet Posted July 2, 2007 Share Posted July 2, 2007 I was going to suggest that. There are ECU's available that can be specificaly programmed for this and there's of course the progressive controller as mentioned above but I don't think that's linked directly to an ECU as such. I was told for mine to forget the 'movie' buttons n go for one of those options. I got in my kit a swich for under the accelerater which stops hurling it in the second u let go of it. Quote Link to comment Share on other sites More sharing options...
SimonR Posted July 2, 2007 Author Share Posted July 2, 2007 Um, I wasn't thinking of anything as complicated (or expensive) as a progressive controller. I'm thinking a straightforward small shot at WOT from the start line until I reach x PSI then switch off the gas and boost only for the rest of the run. Quote Link to comment Share on other sites More sharing options...
tooquicktostop Posted July 2, 2007 Share Posted July 2, 2007 That appears to be to turn it on, Simon wants a boost pressure switch to turn it off at a set boost level I should read with more care Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted July 2, 2007 Share Posted July 2, 2007 Um, I wasn't thinking of anything as complicated (or expensive) as a progressive controller. What size jet or jets? Doing Nos cheaply can and will cause much more expensive problems im afraid Quote Link to comment Share on other sites More sharing options...
SimonR Posted July 2, 2007 Author Share Posted July 2, 2007 I did look at controlling it via the Emanage (using the 5v output meant for an additional injector) but I'd still need some kind of pricey control module to take that 5v signal and control the solonoid with it. Quote Link to comment Share on other sites More sharing options...
SimonR Posted July 2, 2007 Author Share Posted July 2, 2007 What size jet or jets? I was going to start with a 25 and work my way up. Doing Nos cheaply can and will cause much more expensive problems im afraid I'm feeling brave. I was endlessly warned that I would blow up my engine by mapping it myself but that advice turned out to be unfounded so I'll have a go at the nitrous as well. Quote Link to comment Share on other sites More sharing options...
JamieP Posted July 2, 2007 Share Posted July 2, 2007 I have a arming switch on the dash then the nos is on a wot stitch on my TB. Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted July 2, 2007 Share Posted July 2, 2007 I would guess it would be a lot less pricey than a new engine The main thing to think is if the jets are fairly large, a sudden increase in the power can cause clutch slip EDIT - 25 jet shouldnt be too bad Quote Link to comment Share on other sites More sharing options...
SimonR Posted July 2, 2007 Author Share Posted July 2, 2007 I have a arming switch on the dash then the nos is on a wot stitch on my TB.That's what I've bought. I assume that you aren't switching the nos off when you get boost? Quote Link to comment Share on other sites More sharing options...
JamieP Posted July 2, 2007 Share Posted July 2, 2007 That's what I've bought. I assume that you aren't switching the nos off when you get boost? I use mine the opposite, i dont use it till full boost is well on as i dont want to be bending any rods at low revs. Quote Link to comment Share on other sites More sharing options...
Trig Posted July 2, 2007 Share Posted July 2, 2007 I have a arming switch on the dash then the nos is on a wot stitch on my TB. What is TB Jamie? I have a wot switch to, was thinking of mounting on the gearknob somewhere so i can press it when i want Quote Link to comment Share on other sites More sharing options...
SimonR Posted July 2, 2007 Author Share Posted July 2, 2007 Ho ho. Most amusing. We're not getting any closer to which switch people are using, though. Quote Link to comment Share on other sites More sharing options...
JustGav Posted July 2, 2007 Share Posted July 2, 2007 I went to maplin and got standard toggle switch with a fighter pilot red hat over the top to prevent accidental triggering. Quote Link to comment Share on other sites More sharing options...
SimonR Posted July 2, 2007 Author Share Posted July 2, 2007 That's the arming switch, not the boost switch. Quote Link to comment Share on other sites More sharing options...
JamieP Posted July 2, 2007 Share Posted July 2, 2007 What is TB Jamie? Throttle body. Quote Link to comment Share on other sites More sharing options...
JustGav Posted July 2, 2007 Share Posted July 2, 2007 That's the arming switch, not the boost switch. Sorry, my mistake, am I correct in assuming you are looking for something that at a certain pressure opens/closes a relay? Quote Link to comment Share on other sites More sharing options...
Trig Posted July 2, 2007 Share Posted July 2, 2007 Throttle body. Ah i see. could you mount this under the accelerator pedal? PS sorry Simon Quote Link to comment Share on other sites More sharing options...
JamieP Posted July 2, 2007 Share Posted July 2, 2007 Ah i see. could you mount this under the accelerator pedal? PS sorry Simon Yea should be possible. Quote Link to comment Share on other sites More sharing options...
SimonR Posted July 2, 2007 Author Share Posted July 2, 2007 Yes, a relay which has common/NC/NO connections such as you'd find on a thermostat. Quote Link to comment Share on other sites More sharing options...
JustGav Posted July 2, 2007 Share Posted July 2, 2007 Any good? http://rswww.com/cgi-bin/bv/rswww/searchBrowseAction.do?Nr=AND%28avl%3auk%2csearchDiscon_uk%3aN%29&Ntx=mode%20matchpartial&N=4294730640&name=SiteStandard&in_dim_search=1&callingPage=/jsp/search/search.jsp&BV_SessionID=@@@@0911099355.1183393886@@@@&BV_EngineID=ccdfaddlgekiiiecefeceeldgkidhgg.0&cacheID=uknetscape http://rswww.com/cgi-bin/bv/rswww/searchBrowseAction.do?Nr=AND(avl%3auk,searchDiscon_uk%3aN)&Ntx=mode%20matchpartial&N=4294730640&in_dim_search=1&name=SiteStandard&forwardingPage=line&R=2970046&callingPage=/jsp/search/search.jsp&BV_SessionID=@@@@0911099355.1183393886@@@@&BV_EngineID=ccdfaddlgekiiiecefeceeldgkidhgg.0&cacheID=uknetscape Quote Link to comment Share on other sites More sharing options...
SimonR Posted July 2, 2007 Author Share Posted July 2, 2007 See this. "There are 3 electrical connections to the device. One is common. One is N/O (normally open). The other is N/C (normally closed)." This one has pressure passing through but that's not necessary. I would probably set switch up with the N/C to the WOT switch, the common to the solenoid. The nitrous comes on when the WOT switch detects Wide Open Throttle and goes off when the boost hits the pre-defined level (the relay switches to N/O). Quote Link to comment Share on other sites More sharing options...
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