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Post by howardb66 on Mar 5, 2020 10:33:35 GMT
Hi
I’m contemplating ways of reducing underbonnet temperatures, especially the supercharger. I’ve got an oil cooler, alloy rad & intercooler which are all fed through the standard mouth with a GV style chin spoiler.
So, anyone have any advice? I’ve looked at the flyin Miata vent kit but looks expensive for what you get, also the under bonnet clearance is very tight above the SC manifold (about 3mm).
I’ve got a spare bonnet in case of cockups......
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Post by dadbif on Mar 5, 2020 11:13:40 GMT
Do you have heat shielding between the exhaust and supercharger?
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Post by martiny on Mar 5, 2020 11:21:39 GMT
Are you more concerned about the blower getting hot on track or on the road?
On the road my personal preference is a single pre-blower throttle and a bypass to reduce the pumping effort of the supercharger while cruising, but that's not really ideal with an air/air intercooler rather than a chargecooler. On track I guess the greater concern is time spent at WOT in which case I suspect the biggest gain would be feeding the blower cold air, maybe from a Randall style cowl intake, although I think Mk.2s offer more options to route cold air from the front than Mk.1s.
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Post by howardb66 on Mar 5, 2020 12:45:37 GMT
Do you have heat shielding between the exhaust and supercharger? Yes, I’ve wrapped the exhaust manifold & made sure there is clearance. MartinY, I’ve not got the fog lights installed & use the n/s to blow cold air onto the air filter. It’s got 2 TBs & a bypass using a Mini Cooper bypass valve.
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Post by Zed. on Mar 5, 2020 20:05:21 GMT
I'd be cautious against adding a bonnet vent with an undertray fitted the enginebay is fed air through the bumper/rad then around the engine and out around the gearbox. with a bonnet vent the airflow will change and maybe not give the results you hope for maybe worth ducting some air from the front? look into aero & high/low pressure areas / venturi's & ducting Rich.
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Post by dadbif on Mar 5, 2020 22:19:36 GMT
I have too a single TB pre charger and take the intake air from behind the nearside headlamp, made a heat shielding around the filter as used by many people with NB’s. I have a double layer of aluminised fibreglass mat heat shielding between the standard heat shield and the s/charger. Works for me so far, but I only use the car thrashing around in the roads, not on track.
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jon
Chats A Lot
Posts: 270
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Post by jon on Mar 6, 2020 10:11:13 GMT
Making a decent undertray should make a big difference. For normal motorway usage on a warm day there's ~10C difference in both oil and water temps on mine depending on if the undertray is fitted.
I have a sheet of dibond aluminium sheet in the garage ready to make a 'mushroom' shaped undertray that follows the shape of the front bumper and then the narrow part back to the standard mounting points. I'm also going to duct the inside of the nosecone so that all of the air is forced into the engine bay rather than escaping out of the sides of the void between the bumper and rad (I can't use the standard ducting due to pipework and the intercooler)...
If you have a look on miataturbo there's a fair bit of information / plans on how best to reduce temperatures..
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Post by howardb66 on Mar 13, 2020 9:14:41 GMT
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Post by atlex on Mar 13, 2020 18:48:02 GMT
not a bonnet vent per se but here's something I will get around to doing this year ... rev9autosport.com/nielex-undercover-end-lip.htmlnielex claims this.. .... • Reduces engine temperature by average of ~5 degrees I think a small stop at B&Q would give you everything you need to replicate this, well, it's basically a gurney flap attached to a cut-back undertray
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Post by howardb66 on Mar 14, 2020 7:21:15 GMT
not a bonnet vent per se but here's something I will get around to doing this year ... rev9autosport.com/nielex-undercover-end-lip.htmlnielex claims this.. .... • Reduces engine temperature by average of ~5 degrees I think a small stop at B&Q would give you everything you need to replicate this, well, it's basically a gurney flap attached to a cut-back undertray Thanks for that! I have exactly the same thing on the Griffith & was wondering if something similar might show up. Conveniently, I already have some left overs in the garage too- a free upgrade!! (Proper man-maths)😁
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Post by niklas on Mar 29, 2020 18:21:21 GMT
Bonnet vents are great. They increase df from splitters, they lower engine bay temperatures and they are easy to install.
I myself went for the cheapo kind with aluminium mesh. Proper vents are better.
Downside is that it rains into the engine bay. My car isn't parked outside usually, so it doesn't matter much to me. Also, the sleeper look is impossible with holes in the bonnet.
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