rob1991 Posted December 7, 2013 Share Posted December 7, 2013 I've been looking into buying a plenum spacer for a while now and am currently looking at getting the H-Dev plenum spacer but have looked at Motordyne thermal plenum spacer, does heat soak actually affect the performance of the car justifying the extra cost and importing? Thanks Rob. Quote Link to comment Share on other sites More sharing options...
Paddy78 Posted December 7, 2013 Share Posted December 7, 2013 Not worth it. The gains are minimal anyway and you'll need a remap. If you're looking for an anodised spacer, then Wasso (Ian) still has some for sale. Quality and fitment is excellent! http://www.350z-uk.com/topic/71728-fsbatch2-custom-anodised-plenum-spacers-170/ Quote Link to comment Share on other sites More sharing options...
Neilp Posted December 7, 2013 Share Posted December 7, 2013 I have a thermal spacer. It comes with a hot water bypass valve for the throttle body which you can use in the summer time to keep temps down further Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted December 7, 2013 Share Posted December 7, 2013 The thermal gasket does work but not really required unless you are a forced induction weekend track warrior/hooligan Alex. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted December 7, 2013 Share Posted December 7, 2013 (edited) In theory at anything over idle the heat transfered through the metal of the plenum will make no difference to the overall temperature and performance, due to what is known as boundary layer effect, its actually only the air within 1-2mm of the metal that heats up, the rest it has no effect on, same goes for the heated throttle, which was initially developed for aircraft as the fuel was delivered via carburetter before the throttle plate, and would ice up at altitude, this has been carried on even on fuel injected engines, yes the air flow can cause ice, but I have yet to see any other provable reason for keeping it on anything but arctic climates. Same goes for boost pipes on FI engines, a lot seem to think that lagging them is a good idea, but its just wasted money for the same reason as my first comment. Edited December 7, 2013 by Tricky-Ricky Quote Link to comment Share on other sites More sharing options...
Neilp Posted December 7, 2013 Share Posted December 7, 2013 Air within 1-2mm of the metal over the area of 1m2 is quite a large volume though? The thermal kit has a thermal spacer which goes between the engine block and plenum separating both. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted December 7, 2013 Share Posted December 7, 2013 With a boundary layer effect the 1-2mm is relatively static and is in effect decoupled for the the airflow so doesn't raise the temperature of the moving air, the air temperature entering the intake system has far more effect on an N/A application, and the lower the better for power.your far better of spending your cash on improving the intake than fafing about with thermal decoupling. Quote Link to comment Share on other sites More sharing options...
rob1991 Posted January 4, 2014 Author Share Posted January 4, 2014 Thanks for your help, I didn't get the thermal one. After fitting the plenum I couldn't believe how much meatier the engine sounds! High flow cats are next to go on Quote Link to comment Share on other sites More sharing options...
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