rossky Posted August 5, 2011 Share Posted August 5, 2011 Hi all at mk1v. Current r32 gtr owner here with my car for sale looking to buy an aerotop TT. Now ive been doin abit of searching but got no black and white answers, I had to fit an ecu and remap for 95ron for the gtr. Simple yes or no question wil I have to do the same for a j-spec TT? Im just looking to factor in cost. Hope I dont regret the car swap! Can the standard ecu ecu be toyed(mapped) with? Quote Link to comment Share on other sites More sharing options...
Josh Posted August 5, 2011 Share Posted August 5, 2011 The difference between the 95 and 98/99RON is negligible tbh. Also, you can run either, it doesn't really matter with the stock ECU. I think J specs are mapped for 99 but I know some members use 95 without an issue. Quote Link to comment Share on other sites More sharing options...
Wez Posted August 5, 2011 Share Posted August 5, 2011 The difference between the 95 and 98/99RON is negligible tbh. Also, you can run either, it doesn't really matter with the stock ECU. I think J specs are mapped for 99 but I know some members use 95 without an issue. Really, are you sure about that, on a UK or NA 95ron is fine, possibly OK on a stock import TT but why risk it? You wouldnt catch me sticking 95ron in a BPU import TT running 1.2bar boost Quote Link to comment Share on other sites More sharing options...
Wez Posted August 5, 2011 Share Posted August 5, 2011 To answer your other question, the stock ECU cannot be remapped, not in the UK anyway, there are other stock based ECUs like Mines, Blitz etc but they are all tuned for fuel above 95ron and rare Quote Link to comment Share on other sites More sharing options...
Abz Posted August 5, 2011 Share Posted August 5, 2011 Really, are you sure about that, on a UK or NA 95ron is fine, possibly OK on a stock import TT but why risk it? You wouldnt catch me sticking 95ron in a BPU import TT running 1.2bar boost Exactly, also the JSpec's were running close to 100RON in Japan I believe. I ran my TT on VPower always, I have ran it on 95RON when I couldn't find a higher RON and it works fine, though seems to be a little lumpy on idle. Quote Link to comment Share on other sites More sharing options...
Wez Posted August 5, 2011 Share Posted August 5, 2011 Just to give you an idea of the difference between 95ron and super, my car is normally 592hp, on a 95ron map it's only 500hp. Quote Link to comment Share on other sites More sharing options...
Josh Posted August 5, 2011 Share Posted August 5, 2011 Really, are you sure about that, on a UK or NA 95ron is fine, possibly OK on a stock import TT but why risk it? You wouldnt catch me sticking 95ron in a BPU import TT running 1.2bar boost I doubt it would do any harm. There's no way I'd put it in any sort of decent/powerful car though. I'm sure there are a few who use 95 though. Quote Link to comment Share on other sites More sharing options...
Abz Posted August 5, 2011 Share Posted August 5, 2011 I doubt it would do any harm. There's no way I'd put it in any sort of decent/powerful car though. I'm sure there are a few who use 95 though. Yep, UK Spec's & NA's, OP is after a JSpec TT. Quote Link to comment Share on other sites More sharing options...
Josh Posted August 5, 2011 Share Posted August 5, 2011 Yep, UK Spec's & NA's, OP is after a JSpec TT. Ah cool. I'm sure I read before that some Jspec TT owners use 95. Might be incorrect. Either way, what's a few £ difference each time you fill up? It's not exactly economical enough to worry about it Quote Link to comment Share on other sites More sharing options...
Tyson Posted August 6, 2011 Share Posted August 6, 2011 The difference between the 95 and 98/99RON is negligible tbh. Also, you can run either, it doesn't really matter with the stock ECU. I think J specs are mapped for 99 but I know some members use 95 without an issue. The stock Jspec map is designed to run on 102 Ron which is what they use in Japan, 95 can be used in emergencies but if you gave it the beans you would get detonation issues. That is potentially dangerous advice to give on a subject you don't understand, I think people would rather you not post than post something wrong. Quote Link to comment Share on other sites More sharing options...
tony tt Posted August 6, 2011 Share Posted August 6, 2011 I lived in ireland for 6years with my tt6 after 3 years the engine had catastrophic failure due to poor detonation running 95ron. Never use 95ron consistently on a tt under any circumstances!!! I blew 2nd turbo and melted a cylinder. Hence why I moved back to the uk. Quote Link to comment Share on other sites More sharing options...
tony tt Posted August 6, 2011 Share Posted August 6, 2011 There is an e85 fuel in Ireland that might be better than the 95ron but you will have to do some research on. Quote Link to comment Share on other sites More sharing options...
johnny g Posted August 6, 2011 Share Posted August 6, 2011 The difference between the 95 and 98/99RON is negligible tbh. Also, you can run either, it doesn't really matter with the stock ECU. I think J specs are mapped for 99 but I know some members use 95 without an issue. Couldn't disagree more. As mentioned above. 95RON is ok for emergencies, off boost, to get you somewhere where you can get 98/99. If you boost, you'll risk detonation. If you're BPU and you boost, that risk is much greater. I keep a bottle or two, usually, of octane booster in the car. If I have to put 95 in, for whatever reason, I can add a bottle of octane booster, for safety. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 6, 2011 Share Posted August 6, 2011 The stock knock sensors should pick up any det and put the timing back and add fuel. Fuel consumption may be even worse than normal, and performance will be down, but no way should it melt a piston. Quote Link to comment Share on other sites More sharing options...
Josh Posted August 6, 2011 Share Posted August 6, 2011 In my first post I meant to say "The difference between the COST OF THE 95 and 98/99RON is negligible tbh". Just meaning that the 95 is ok if nothing else is about and you need fuel, but not often. There should be no question about regretting buying the car for a few pounds extra each time you fill up. Sorry for the confusion/rubbish advice. Quote Link to comment Share on other sites More sharing options...
peter richards Posted August 6, 2011 Share Posted August 6, 2011 only ever put normal unleaded in mine had it ten years , ok i dont screw it but its still here Quote Link to comment Share on other sites More sharing options...
scotty71 Posted August 6, 2011 Share Posted August 6, 2011 Josh again posting useful info NOT - stick to mallets mallet Standard Japanese fuel is 99 ron so thus Johnny is spot on. I use V Power or Momentum and if I run low use 95 (off boost) till I can fill up again. ** Josh uses that special 45 mpg fuel in his uk** couldnt resist that one Josh To the OP just use 99 ron, if the diffence in that to 95 is a worry a Supra probably isnt for you Quote Link to comment Share on other sites More sharing options...
rossky Posted August 6, 2011 Author Share Posted August 6, 2011 thanks for all the replys guys. So from wot I gather the sensible thing to do is ann ecu change and remap. Although I was on maxol website last nite and it says they sell e5 fuel which is 99ron. As I live in ireland I couldnt believe it. So I went to a maxol today and all the pumps were marked e5! so looks like 99ron is readily available-from the website I gather its bioethenol. But knowing the irish way of doing things all the pumps are probably full of standard 95 ron even though they are all labelled e5. Quote Link to comment Share on other sites More sharing options...
Homer Posted August 6, 2011 Share Posted August 6, 2011 thanks for all the replys guys. So from wot I gather the sensible thing to do is ann ecu change and remap. Although I was on maxol website last nite and it says they sell e5 fuel which is 99ron. As I live in ireland I couldnt believe it. So I went to a maxol today and all the pumps were marked e5! so looks like 99ron is readily available-from the website I gather its bioethenol. But knowing the irish way of doing things all the pumps are probably full of standard 95 ron even though they are all labelled e5. If you keep it at stock boost 95ron will be fine on any supra, if you start raising the boost you *may* face issues on the Jspec TT if key components are not in good/excellent condition (IC, fuel pump, injectors, etc). I very much doubt you'll get any noticable problems running 95 RON as the stock ECU has knock detection, so a major failure is not likely. It will be down on power though. If you want to raise boost and only have 95ron available AND want to 100% confident of no potential issue, however small, do the BPU mods and then fit an (expensive) standalone ECU and have it mapped accordingly. You will not likely make the power back that 99ron will allow, but it should see you good to run 95ron with complete confidence. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.