matthewswinimer Posted September 7, 2012 Share Posted September 7, 2012 hi there i will be installing a meth kit due to the fact here in novascotia we only have 91 octane premium when i run high boost (17-18 psi) i get detonation. just wondering if will require any tuning after installed this or will the factory ecu account for this. car is a 1994 jdm toyota supra tt 6 speed(obd1 with map sensor) Quote Link to comment Share on other sites More sharing options...
bignum Posted September 7, 2012 Share Posted September 7, 2012 Theres not alot you can do with tuning on the stock ecu but it will relearn to fuel changes anyway, you could also add meth straight into your fuel for an octane boost. Quote Link to comment Share on other sites More sharing options...
Luxluc Posted September 7, 2012 Share Posted September 7, 2012 I have a meth injection kit in my car. I put 50/50 water-meth mixture in the additional tank. When Ryan mapped it last year, we ended up not to use it. When we added the water/meth mixture, the AFR went very rich, which is normal. So you can go much leaner on the fuel, and thus run much higher boost. The big problem will come if the meth pump fails, or if the meth injector will get stuck, you will immediately blow up your engine if you floor the car. Quote Link to comment Share on other sites More sharing options...
Noz Posted September 7, 2012 Share Posted September 7, 2012 With a water/meth setup it's recommend to have a flow sensor. Most kits come with a level sensor, but only premium kits comes with a flow sensor. This is just as important. If you have these two, then you have fail safes. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted September 7, 2012 Share Posted September 7, 2012 By the time you have added a decent water/meth injection kit along with all the fail safes you will need to protect the engine, you might as well buy yourself a mappable ECU and have it mapped to the lower octane fuel, however your trying to run too much boost for a std ECU anyway, At anything over 14PSI the injector duty cycle is running at 100% so even with the correct octane fuel i suspect you will still be lacking enough fuel to run that boost. Quote Link to comment Share on other sites More sharing options...
matthewswinimer Posted September 7, 2012 Author Share Posted September 7, 2012 I have a meth injection kit in my car. I put 50/50 water-meth mixture in the additional tank. When Ryan mapped it last year, we ended up not to use it. When we added the water/meth mixture, the AFR went very rich, which is normal. So you can go much leaner on the fuel, and thus run much higher boost. The big problem will come if the meth pump fails, or if the meth injector will get stuck, you will immediately blow up your engine if you floor the car. i thought that meth was corrisove to rubbers, and aluminium and such if added directly to fuel tank....... Quote Link to comment Share on other sites More sharing options...
matthewswinimer Posted September 7, 2012 Author Share Posted September 7, 2012 By the time you have added a decent water/meth injection kit along with all the fail safes you will need to protect the engine, you might as well buy yourself a mappable ECU and have it mapped to the lower octane fuel, however your trying to run too much boost for a std ECU anyway, At anything over 14PSI the injector duty cycle is running at 100% so even with the correct octane fuel i suspect you will still be lacking enough fuel to run that boost. oh well then how come the big talk around the foums is the glorious 1.2 bar?? so confused Quote Link to comment Share on other sites More sharing options...
mellonman Posted September 7, 2012 Share Posted September 7, 2012 oh well then how come the big talk around the foums is the glorious 1.2 bar?? so confused we have 99 ron/octaine petrol mate supraforums.com would have more information on water meth i think as they are based in america with the lower grade petrol Quote Link to comment Share on other sites More sharing options...
Luxluc Posted September 7, 2012 Share Posted September 7, 2012 i thought that meth was corrisove to rubbers, and aluminium and such if added directly to fuel tank....... I do have an additional water/meth tank. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted September 7, 2012 Share Posted September 7, 2012 oh well then how come the big talk around the foums is the glorious 1.2 bar?? so confused Yes you can run 1.2bar all right, however my statement still stands, because after a certain pressure threshold the ECU runs IDC at 100% so add the low octane fuel to the equation and of course you will get det, What i am saying is that you will be better off with a mappable ECU to suite the fuel, rather than spend Shiite loads of cash fitting a reliable meth injection system, however you could just add the correct amount of octane booster to the fuel to bring it to 98/99 RON. But you asked the question about meth injection, as said talk to the US guys about what to do you may get a cheap solution, but i can only give IMO sensible advice based on what you have said;) Quote Link to comment Share on other sites More sharing options...
Durandal Posted September 7, 2012 Share Posted September 7, 2012 (edited) Can you get access to Xylene or Toluene? You can mix that with your fuel to bring it up to the higher octane. Otherwise as Ricky said you will have to get bigger injectors and a piggyback ECU. Edited September 7, 2012 by Durandal (see edit history) Quote Link to comment Share on other sites More sharing options...
matthewswinimer Posted September 8, 2012 Author Share Posted September 8, 2012 Yes you can run 1.2bar all right, however my statement still stands, because after a certain pressure threshold the ECU runs IDC at 100% so add the low octane fuel to the equation and of course you will get det, What i am saying is that you will be better off with a mappable ECU to suite the fuel, rather than spend Shiite loads of cash fitting a reliable meth injection system, however you could just add the correct amount of octane booster to the fuel to bring it to 98/99 RON. But you asked the question about meth injection, as said talk to the US guys about what to do you may get a cheap solution, but i can only give IMO sensible advice based on what you have said;) ok thanks for the info. i think for now iam just goona get some octane boost and try it in the tank just to see if that cures it. nos brand "claims" to boost the octane by 60 points, still a little sceptical on octane boosters. and yes i plan on getting bigger injectors and aem ecu right now i cant take that big of a money shit this year. Quote Link to comment Share on other sites More sharing options...
matthewswinimer Posted September 8, 2012 Author Share Posted September 8, 2012 regardless . i dotn wana settle for that low of a octane, theres so much power loss at 91, and unfortunatly we will not see anything higher around novascotia for a while so as far as long term octane boosting goes would you guys agree with meth, or mix unleaded race fuel everytime i fill up? Quote Link to comment Share on other sites More sharing options...
Luxluc Posted September 8, 2012 Share Posted September 8, 2012 Isn't there any E85 available around you? Quote Link to comment Share on other sites More sharing options...
matthewswinimer Posted September 8, 2012 Author Share Posted September 8, 2012 Isn't there any E85 available around you? nope Quote Link to comment Share on other sites More sharing options...
CanisLupus Posted September 8, 2012 Share Posted September 8, 2012 For E85 he'll need a Piggy Back or Standalone any ways... Supra goes MAD lean untuned with E85 on boost Also the Stock 440 injectors will max out at 0,9bar with E85. 550s will MAYBE make 1,2bar at 100% Injector Duty Quote Link to comment Share on other sites More sharing options...
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