David P Posted September 4, 2011 Share Posted September 4, 2011 Make sure that TRD cap is the right fit before you use it, I didn't know they were available in the smaller size. Quote Link to comment Share on other sites More sharing options...
adam1983 Posted September 4, 2011 Author Share Posted September 4, 2011 Make sure that TRD cap is the right fit before you use it, I didn't know they were available in the smaller size. I put the koyo rad cap back on for the past couple of days as it was happening the same with the TRD cap. Reason being that the koyo rad cap has a lower pressure rating than the TRD which will be fine for now. Quote Link to comment Share on other sites More sharing options...
adam1983 Posted September 4, 2011 Author Share Posted September 4, 2011 Dont give me a hard time mate. I hate making videos at the best of times This one doesnt seem too bad though from what I have watched but would be good to have some further input from you guys. The video sort of ends up turning into a compression test tutorial though which cant be a bad thing if all that I did was right Im looking forward to your response the most now Quote Link to comment Share on other sites More sharing options...
adam1983 Posted September 4, 2011 Author Share Posted September 4, 2011 Uploading video to youtube now. According to the upload progress it says 90 mins but hopefully that is all lies. Will post up on here as soon as its finished. Quote Link to comment Share on other sites More sharing options...
Supra_dan Posted September 4, 2011 Share Posted September 4, 2011 My hose was going hard ( no pun ) and losing coolant, I had a 1.3 bar cap and changed it back to an original cap and my coolant is fine now. Quote Link to comment Share on other sites More sharing options...
David P Posted September 4, 2011 Share Posted September 4, 2011 Quote Link to comment Share on other sites More sharing options...
adam1983 Posted September 4, 2011 Author Share Posted September 4, 2011 My hose was going hard ( no pun ) and losing coolant, I had a 1.3 bar cap and changed it back to an original cap and my coolant is fine now. Would like to do that myself mate but the stock cap doesnt fit on the koyo rad unfortunately. Quote Link to comment Share on other sites More sharing options...
Marty Posted September 4, 2011 Share Posted September 4, 2011 Would like to do that myself mate but the stock cap doesnt fit on the koyo rad unfortunately. Its Mk3 supra fitment mate as far as i'm aware, buy one from halfrauds and try that. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted September 4, 2011 Share Posted September 4, 2011 Watching this with a vested interest. I absolutely believe there is nothing wrong as I did the thermostst and rad change. Quote Link to comment Share on other sites More sharing options...
David P Posted September 4, 2011 Share Posted September 4, 2011 Watching this with a vested interest. I absolutely believe there is nothing wrong as I did the thermostst and rad change. Is this your day in Kangaroo Court? Quote Link to comment Share on other sites More sharing options...
adam1983 Posted September 4, 2011 Author Share Posted September 4, 2011 Watching this with a vested interest. I absolutely believe there is nothing wrong as I did the thermostst and rad change. I know what your saying mate but im sure if there was nothing wrong that the top rad hose wouldnt be rock hard. I know you said about the fact that the rad cap was a higher setting but still i wouldnt expect it to be so much pressure build up. Your more than welcome to come around again and have a look and see what I mean as a second opinion on this is definately what im looking for. You could be right saying there is nothing wrong but I need to be 100% about this and it just doesnt seem right. Quote Link to comment Share on other sites More sharing options...
adam1983 Posted September 4, 2011 Author Share Posted September 4, 2011 Ok so below is my attempt to show the symptoms and also a compression test I carried out straight after. Not sure how obvious it comes across in the video but the top rad hose is very hard. The thread part of a couple of the spark plugs was a bit oily but I guess that is pretty normal. Anyway I hope the video is informative if nothing else. Any criticisms or suggestions welcome Quote Link to comment Share on other sites More sharing options...
adam1983 Posted September 4, 2011 Author Share Posted September 4, 2011 (edited) A couple of pictures to show the expansion tank layout: Edited September 4, 2011 by adam1983 (see edit history) Quote Link to comment Share on other sites More sharing options...
Dnk Posted September 5, 2011 Share Posted September 5, 2011 (edited) I think we need to know for sure if the cars losing coolant which you seemed to think it was. It would appear the rad cap is more than likely a higher pressure than O/E If its higher than stock then obviously the top hose will be harder than mine due to the higher pressure your whole system will be under which i see no point for unless your running hotter engine temps. If my maths is right which stands a chance it won't be but i'll go with it The pressure from 1.1 bar to 1.3 bar is approx a 20% rise and if i was to do that on my car the top hose would be rock hard. 1.1 bar = 15.954 psi 1.2 bar = 17.404 psi 1.3 bar = 18.854 psi My opinion is get a stock rated cap for your Koyo rad. Edited September 5, 2011 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
adam1983 Posted September 5, 2011 Author Share Posted September 5, 2011 Ok I will have a look for a 1.1 cap for the koyo rad. I think someone said a mkiii one would fit is that right? Or any others I could try? Cheers Quote Link to comment Share on other sites More sharing options...
David P Posted September 5, 2011 Share Posted September 5, 2011 Demontheives sell Stant caps that are the correct fit for the Koyo & ASI rads. Quote Link to comment Share on other sites More sharing options...
adam1983 Posted September 5, 2011 Author Share Posted September 5, 2011 Demontheives sell Stant caps that are the correct fit for the Koyo & ASI rads. Thanks David I will take a look at those in a bit. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted September 5, 2011 Share Posted September 5, 2011 Isnt the stock cap .9bar? Quote Link to comment Share on other sites More sharing options...
adam1983 Posted September 5, 2011 Author Share Posted September 5, 2011 Isnt the stock cap .9bar? I thought stock TT was 1.1 but I could be wrong Quote Link to comment Share on other sites More sharing options...
David P Posted September 5, 2011 Share Posted September 5, 2011 I thought stock TT was 1.1 but I could be wrong Quote Link to comment Share on other sites More sharing options...
adam1983 Posted September 6, 2011 Author Share Posted September 6, 2011 Im a bit confused now as I thought the stock cap for a TT supra was 1.1 Just been on this site and its showing as 0.9: http://www.japarts.co.uk/shop/?sh=search&make=10&model=SUPRA&vehicle_iid=1579&search=2 The rubber bit on the bottom looks different to the one i had for my stock rad too but looks identical to the one im running on the koyo rad. Anyone know the definite answer on this? Quote Link to comment Share on other sites More sharing options...
David P Posted September 6, 2011 Share Posted September 6, 2011 (edited) Some aftermarket alloy rads including Koyo and ASI use a slightly smaller than stock cap. Stant make these in several pressures which can be bought from Demontweeks, but you must ask. These are listed in their catalogue and they stock them, but not shown on their website. Order by phone and ask. Edit: C.W. says stock OE cap is 0.9 bar. Edited September 6, 2011 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 6, 2011 Share Posted September 6, 2011 The stock cap is 0.9 bar, and unless you have a new OE heater matrix fitted I would suggest you don't fit anything any higher pressure Quote Link to comment Share on other sites More sharing options...
adam1983 Posted September 6, 2011 Author Share Posted September 6, 2011 The stock cap is 0.9 bar, and unless you have a new OE heater matrix fitted I would suggest you don't fit anything any higher pressure Do you know of any 0.9 caps that will fit the koyo rad? I'm not sure if the stock one will fit. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 6, 2011 Share Posted September 6, 2011 I don't, but I *think* that rad uses the MKIII Supra size cap, so if a stock MKIII cap is 0.9 bar.... Quote Link to comment Share on other sites More sharing options...
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