jumpbike Posted April 11, 2012 Share Posted April 11, 2012 Hi, i'm newish to these cars but have a gte engine waiting with hybrid twins on it, it is from a 94 jap spec car and i know these engines are map based rather than maf and the inlet side of the engine isn't as aggressive as the export versions of the gte engine, my question is, i'm basically going to do my best to see what these turbos can do but anyone any ideas of the limits of the standard inlet cam on a jap spec engine and how much difference is there on the uk spec engine, is it literally just a different cam shaft or is there a little more to it? thanks, Quote Link to comment Share on other sites More sharing options...
Hellstrom Posted April 12, 2012 Share Posted April 12, 2012 (edited) Your injectors Will be the major obsticle before cam shafts, they flow 440cc IIRC. The export version had 550cc. They also have a bigger wastgate. At around the same level you will gain from changeing cams and the more power you want to make the more diffrence it will make. Edited April 12, 2012 by Hellstrom (see edit history) Quote Link to comment Share on other sites More sharing options...
jumpbike Posted April 12, 2012 Author Share Posted April 12, 2012 I wasn't thinking injectors because i'll jus get the size I need at the time, was more jus woundering if it was as simple as swapping the inlet cam shaft to the export one to get what ever slight benefits there will be from it, it's that or while i've got time just track down a couple of 264 cams or something off someone selling parts. Is there any known difference in the valves at all? Quote Link to comment Share on other sites More sharing options...
Nic Posted April 12, 2012 Share Posted April 12, 2012 The valves are the same diameter on the J-spec and UK spec Supras, the exhaust cams are also the same spec on both models. The UK spec inlet cam is slightly longer duration and higher lift see link below for details. The UK inlet cam can be swapped onto the J-spec head, personally though if I was swapping the cams I'd go with a set of aftermarket inlet and exhaust cams, in256/ex264 is a popular setup with stock or hybrid turbos. http://www.turbosupras.com/pages/en/pages/specifications/JZA80/jza80.htm Quote Link to comment Share on other sites More sharing options...
jumpbike Posted April 12, 2012 Author Share Posted April 12, 2012 cheers for that, I found a big fat spec list of every difference known to man yesterday, right through to which year and model and spec and engine and gear box has what diff ratio etc. just made me think hmmm, making this into a 6 speed is going to need more than just a gear box to make it right, cam question answered now anyway, thanks for that. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 12, 2012 Share Posted April 12, 2012 I wasn't thinking injectors because i'll jus get the size I need at the time, was more jus woundering if it was as simple as swapping the inlet cam shaft to the export one to get what ever slight benefits there will be from it, it's that or while i've got time just track down a couple of 264 cams or something off someone selling parts. Is there any known difference in the valves at all? Presumably you will have some form of control for the bigger injectors? IE aftermarket ECU, piggyback etc? as to get the best from a hybrid set up you will need that at least. Quote Link to comment Share on other sites More sharing options...
jumpbike Posted April 12, 2012 Author Share Posted April 12, 2012 yea yea, at the moment it's got some piggy back Apexi air/fuel controller with the engine so will get it some thing like at least then when time and money allow just go full aftermarket and get it set up properly. To be honest I have no idea what the hybrids will flow and make hp wise, breaking 600 would be a good start, that's why I was thinking about upgrading the inlet cam, also debating wheather to just get a UK spec engine and put the turbos on that but don't know what the air flow sensors can read upto with out maxing out and wheather sticking with the MAP based jap engine would be better. I'm used to SR20's which for a given year are all the same so it's much simpler. Quote Link to comment Share on other sites More sharing options...
Nic Posted April 12, 2012 Share Posted April 12, 2012 The stock j-spec 440cc injectors will be close to their limit at around 400hp (flywheel) so I'd keep the boost to around 1bar until you can fit an AFR gauge to monitor the fueling. With fueling upgrades, cams and ECU 450hp should be achievable, possibly a little more depending on the spec of the turbos. Not sure what the max hp guys in the UK have achieved on hybrid turbos but it'll be somewhere between 450-500hp. Above 1.2bar and the stock sequential system starts becomes restrictive which drives up temperatures, 1.4 - 1.5bar is around the safe maximum boost you'll be able to run with the above supporting modifications. If you are wanting 600hp then the only real option is to junk the sequential system and run an aftermarket turbo kit, but that's going to need a big budget to do properly. Quote Link to comment Share on other sites More sharing options...
Hellstrom Posted April 12, 2012 Share Posted April 12, 2012 For 600 bhp on "stockish" turbos will need some type of aftermarket manifold as thats pretty restrictive. Also going TTC mode with dual intakes and probebly some custom pipeing for the pressured Air. Good luck Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted April 12, 2012 Share Posted April 12, 2012 No chance of 600BHP on hybrids, you will need a medium sized single turbo minimum, hybrids will give 450 max. Quote Link to comment Share on other sites More sharing options...
johnny g Posted April 12, 2012 Share Posted April 12, 2012 The stock exhaust manifold will be a massive restriction too. Go 6266 or S362 I think for your power. Quote Link to comment Share on other sites More sharing options...
jumpbike Posted April 12, 2012 Author Share Posted April 12, 2012 if i'm going to bail on the hybrids i'd want to do everything to hit 700 and pray bottom end is as we all hope so for now I might jus source some UK spec injectors and get the thing fired up n see where it takes me Quote Link to comment Share on other sites More sharing options...
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