Dragonball Posted September 3, 2003 Share Posted September 3, 2003 I read on the Mkiv that a lack of undertray can be a contributory factor to heat build up as, without it, the 'high pressure' area created under the car...etc etc At this point my eyes glazed over and I lost the will to live...no, seriously... My undertray is still off till next week and I can get under a ramp and get a couple of things done - including new radiator (with STOCK VISCOUS Chris!) But obviously with a FMIC fitted this makes any rad work harder and if this is an element to be considered etc etc Any explanations / views? Link to comment Share on other sites More sharing options...
Steve Cargill Posted September 3, 2003 Share Posted September 3, 2003 I understand that the air flowing under the car helps to suck out air from the engine bay thus helping airflow through the radiator and around the engine. Without the undertray in place this process does not work. A few people run without them, but once you've done your work I'd get it back on ASAP. Link to comment Share on other sites More sharing options...
Steve W2 Posted September 3, 2003 Share Posted September 3, 2003 Obviously without the full aerodynamic details of the car you can't say for sure but..... The air passing under you car will create a suction effect and propogate vortex shedding of the air at the point the two mix. The vortices won't really cause any problems othan than to slightly change the areodynamics of the car. The change would be so minimal it's not even worth thinking about, and I don't think you will have any problems with overheating. Since the velocity of the air passing under the car is greater than the air floating in your engine bay it should suck the air out. Especially at high speeds!:flame Dev Link to comment Share on other sites More sharing options...
GavinL Posted September 3, 2003 Share Posted September 3, 2003 Originally posted by Paul E I read on the Mkiv that a lack of undertray can be a contributory factor to heat build up as, without it, the 'high pressure' area created under the car...etc etc At this point my eyes glazed over and I lost the will to live...no, seriously... My undertray is still off till next week and I can get under a ramp and get a couple of things done - including new radiator (with STOCK VISCOUS Chris!) But obviously with a FMIC fitted this makes any rad work harder and if this is an element to be considered etc etc Any explanations / views? I had high speed front lift on my car after fitting the FMIC. The smaller front undertray was removed and I suspect large amounts of air were being being diverted downwards towards the road not through the IC/ACRAD/RAD as required Now fixed with a metal undertray BTW Link to comment Share on other sites More sharing options...
Terminator Posted September 3, 2003 Share Posted September 3, 2003 Toyota will have spent alot of money on R and D on this and I am sure it is not there for looks as it seals too well for that. IMHO it has a big part to play in engine bay cooling. I would not run without one. Link to comment Share on other sites More sharing options...
MONKEYmark Posted September 3, 2003 Share Posted September 3, 2003 i have had mine off car for about a year, engine does get a bit hot. water pipes and induction hardpipes gets a bit hot. should put back on. Link to comment Share on other sites More sharing options...
Steve W2 Posted September 3, 2003 Share Posted September 3, 2003 I take it back. It looks from other experience that the engine does get hot when its not fitted. Sounds tlike the best thing to do is put it back on! Link to comment Share on other sites More sharing options...
Rob Posted September 3, 2003 Share Posted September 3, 2003 I'm sure you'll get all manner of wet shiteness and gravel etc being flicked up there as well. Why not get it chromed? Link to comment Share on other sites More sharing options...
THOR Racing Posted September 3, 2003 Share Posted September 3, 2003 and talking of undertrays, mine bit the tarmac and disintergrated last week (105Kmiles on the clock). So are there alteratives to the Toyota stock one out there? Anyone making any?? Shall I just get one from a scrap car? Regards Pete Link to comment Share on other sites More sharing options...
Alex Posted September 3, 2003 Share Posted September 3, 2003 Pete, big sheet of aluminium cut to size From the sounds of it this is what Gav has...and Terry has a similar (or the same) setup. Link to comment Share on other sites More sharing options...
Dragonball Posted September 3, 2003 Author Share Posted September 3, 2003 Def puttting mine on asap Cheers paul Link to comment Share on other sites More sharing options...
Steve W2 Posted September 4, 2003 Share Posted September 4, 2003 I've just bought another one to go on my car whilst its being repaired. Glad I looked at this thread now. Knowing my luck I would have gone through all thi shassle to get my car fixed only for it to overheat and catch fire!! Link to comment Share on other sites More sharing options...
Gaz Walker Posted September 4, 2003 Share Posted September 4, 2003 Originally posted by Rob Why not get it chromed? I know your joking there, but thats an idea Gaz. Link to comment Share on other sites More sharing options...
Rob Posted September 4, 2003 Share Posted September 4, 2003 Well yeah, maybe a couple of neons tucked below the engine, switched to the little interior light switch at the front of the bonnet. I am kinda half serious. Link to comment Share on other sites More sharing options...
Sharpie Posted September 4, 2003 Share Posted September 4, 2003 I think one of these will fix the small front undertray section. http://www.mohdparts.com/mohd_bottom_panel/index.html Link to comment Share on other sites More sharing options...
Suprash Posted September 4, 2003 Share Posted September 4, 2003 Originally posted by MONKEYmark i have had mine off car for about a year, engine does get a bit hot. water pipes and induction hardpipes gets a bit hot. should put back on. No sh1t mark, my engine gets hot as well, and with a tray on.... Sorry but that just seems to be pointing out the obvious.......even with a tray on Im sure you will still fill heat in your pipes..... :p and serious amounts of ;) before he gets the hump...... Only joshin mate....but you see what I mean. Link to comment Share on other sites More sharing options...
Steve W2 Posted September 5, 2003 Share Posted September 5, 2003 On the subject of hot engine bays does anyone feel the heat of the engine through the drivers side foot well when youv'e got your foot on the rest? Probably more noticable if your an auto driver as you will have you foot there for longer. Someone tell me that I'm not the only one that this happens to:( Link to comment Share on other sites More sharing options...
Suprash Posted September 5, 2003 Share Posted September 5, 2003 Never noticed it personally, that sounds like a lot of heat to get through that bulk head type part of the car, you sure you havent got the heater pointed towards your feet, or that the vent just isnt closing poperly............. Link to comment Share on other sites More sharing options...
swamp Posted September 5, 2003 Share Posted September 5, 2003 I've just bought another one to go on my car whilst its being repaired. how much was it? as mine has come off and it would sound like i need a new one. Link to comment Share on other sites More sharing options...
Suprash Posted September 6, 2003 Share Posted September 6, 2003 I cant remember exactly, but from Toyota its at least £200, something I couldnt justify for a square bit of plastic. Link to comment Share on other sites More sharing options...
swamp Posted September 6, 2003 Share Posted September 6, 2003 Ashley Willis I cant remember exactly, but from Toyota its at least £200, something I couldnt justify for a square bit of plastic. holy piece of plastic batman! how do they justify that:mad: Link to comment Share on other sites More sharing options...
Suprash Posted September 6, 2003 Share Posted September 6, 2003 Exactly sidekick swamp..... Link to comment Share on other sites More sharing options...
Steve W2 Posted September 7, 2003 Share Posted September 7, 2003 I am feeling the heat through the bulk had part of the car when I have got the air con on! Sounds like my engine is getting really hot, the temperature gause on the dash is only reading half way though. Although I am working on the assumption that its not buggered. I think the ubdertrays are about £200 quid for the OEM ones. Might be worth phoning someone like Jap Village as they have just got me one with an active spoiler assy for £200. Link to comment Share on other sites More sharing options...
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