Snjur Posted February 19, 2017 Share Posted February 19, 2017 I really hope I will. Reading bit on US forums there hasn't been much luck at track without some radical bumpers and hoods. For now will try bumper and rad. If still not OK for track will try to bring more air in with bumper mods Sent from my SM-G850F using Tapatalk Quote Link to comment Share on other sites More sharing options...
Ekona Posted February 19, 2017 Share Posted February 19, 2017 Trouble is that bonnet vents are only going to do so much, even assuming you get them in exactly the right place: you'd be better off focusing on the rad and the flow round the system itself. No different to a house in that respect. Bit of heat-reflective material here or insulation there does a bit, but a bloody great pump and bigger rads will do a lot more a lot quicker Quote Link to comment Share on other sites More sharing options...
Snjur Posted February 19, 2017 Share Posted February 19, 2017 Yeah I definitely agree as vents would have the biggest effect while car is stationed. Will try first with this. 2nd will be to get bumper intakes like on R33 gtr. And than pump etc Sent from my SM-G850F using Tapatalk Quote Link to comment Share on other sites More sharing options...
nub Posted February 19, 2017 Share Posted February 19, 2017 I made a big post on this but I don't know what happened to it. What about vents like this where the bonnet elevates followed by a vent, which may create an area of lower pressure where the hot air can escape. This is still just a theory and I reckon at speed bonnet vents are not so effective. Scoops are another matter though, one low on the bonnet must surely bring cool air into the bay and reduce the temp under the bonnet. Normally they're designed for scoops and intercoolers. I'm sure having no bonnet on at all would make a difference Sent from my iPhone using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
Jetpilot Posted February 20, 2017 Share Posted February 20, 2017 My opinion and thats all it is, if your trying vent anything ideally whatvever your trying to vent, it needs to be ducted. The "bonnet" of my vx220 is heavily vented, but it is ducted round the rad, it is very efficent when moving, but in traffic the temp rises quickly. I also remember going back to rx7's, which ran exceptionally hot, there was many a vented bonnet avalable, none of them actually proved to reduce under bonnet temps, they were all just for looks. In my opinion the most effective way to reduce temps is to either have all the hot stuff ceramic coated, manifolds, turbo hotsides etc or if you dont want the expense, heat wrap, with two manifolds on the 350z in a small engine bay I would bet thats where most of the heat is coming from, not the rad. Quote Link to comment Share on other sites More sharing options...
Snjur Posted February 20, 2017 Share Posted February 20, 2017 Yeah I have already manifolds ceramic coated and turbines as well. Sent from my SM-G850F using Tapatalk Quote Link to comment Share on other sites More sharing options...
Commander Posted February 20, 2017 Share Posted February 20, 2017 On my old e46 m3 I just removed the aircon radiator as it sits directly in front of the water radiator. Just doing that made a MASSIVE difference to temps on track. Quote Link to comment Share on other sites More sharing options...
KyleR Posted February 20, 2017 Share Posted February 20, 2017 Surely the fast moving air over the vents in the bonnet will cause a vacuum and pull the warm air from the engine bay? Quote Link to comment Share on other sites More sharing options...
Jay84 Posted February 20, 2017 Share Posted February 20, 2017 I'm going to put in my thoughts based on no scientific evidence whatsoever too. The air pressure over the bonnet would be affected by the shape and angle of the front bumper, something wedge shaped would put high pressure over the bonnet as less turbulent air, maybe why few gains/losses on rx-7s. But a flat fronted something would cause a lot of turbulence and a lower air pressure flowing over the bonnet than that of a wedge shaped car, maybe allowing bonnet vents to be beneficial if placed properly. But I don't actually know anything, I'm jus guessing and want to feel involved. Quote Link to comment Share on other sites More sharing options...
coldel Posted February 20, 2017 Share Posted February 20, 2017 I have four apertures on my bonnet! Some are for air in (belt cooling) some for out. As they are designed for rallying in mind they must work. Have to say whilst sat in traffic I can see a wall of heat rippling in front of me as it exits the vent in the middle! Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
ilogikal1 Posted February 20, 2017 Share Posted February 20, 2017 I have four apertures on my bonnet! Some are for air in (belt cooling) some for out. As they are designed for rallying in mind they must work. Have to say whilst sat in traffic I can see a wall of heat rippling in front of me as it exits the vent in the middle! Sent from my iPhone using Tapatalk But yours has the ducting etc to direct the air flow appropriately. I had three holes in the bonnet of my Impreza, only one actually worked though, complete with scoop and ducting; the other two were there for homologisation and blocked off for the road going version. Removing the blanking plates and opening them up saw increased under bonnet temperatures - as tested by a number of specialists including, but not limited to, RCM on the Gobstopper in the early days. Quote Link to comment Share on other sites More sharing options...
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