eyefi Posted July 18, 2003 Share Posted July 18, 2003 im ready to order my fuel system, but cant quite make up my mind. i have 2 basic options :- 1/ increase fuel pressure, new pump and rising rate reg. overdrive those 440's. its done on quite alot of cars, cheaper, easier to do, but not quite right. 2/ as above but with some big ass side feed injectors. the injectors will b a bit big for my immediate needs, its about £600 more, still not too difficult to do, more correct, a bit more mapping work, future proof. i have custom exhaust work from the turbo exit removing all the blockages and am aiming for around 500hp. i know it makes sense to go for the bigger injectors but if its sound to do it without then why bother? i dont really have the luxury of getting it mapped on the stock injectors only to find problems then have to map it again on bigger injectors. money is always a concern Quote Link to comment Share on other sites More sharing options...
Steve Cargill Posted July 18, 2003 Share Posted July 18, 2003 Originally posted by eyefi im ready to order my fuel system, but cant quite make up my mind. i have 2 basic options :- 1/ increase fuel pressure, new pump and rising rate reg. overdrive those 440's. its done on quite alot of cars, cheaper, easier to do, but not quite right. That is what I've just had done to mine, bought new ingectors and stayed with the 440's but increased pressure. OK to about 18PSI on stage 3 hybrids apparently. I think the general rule for the Supra is 1cc per HP, so for 500 BHP the 440's would not cope. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 18, 2003 Share Posted July 18, 2003 Do the modified exhaust work as I may be selling my DE fuel rail & sidefeed 850's in a while;) On the fuel pump I would happily raise the pressure but you must make sure of the condition of your pump & a pressure gauge would be nice. Quote Link to comment Share on other sites More sharing options...
eyefi Posted July 18, 2003 Author Share Posted July 18, 2003 yep, ive decided on a new pump and reg, so it should b ok. like u say a small drop in pressure (at the very high pressure the 440's would have to b run at) could b disasterous. it would b really difficult to keep an eye on that, cos u cant setup a warning light for x pressure at y revs. ive got a wideband to go in the car, so that could b useful for a backup warning. hmm, it could end up just being a worry with the small injectors and gazing at gauges rather than the road when on boost. Quote Link to comment Share on other sites More sharing options...
eyefi Posted July 18, 2003 Author Share Posted July 18, 2003 Originally posted by Steve Cargill to about 18PSI on stage 3 hybrids apparently. im planning on running more than that my sensor can cope with about 32psi of boost Quote Link to comment Share on other sites More sharing options...
Ian C Posted July 18, 2003 Share Posted July 18, 2003 I'd go for 2 but hey What's this mega exhaust system work you've had done to cure the restrictions in the turbo exhaust housings? I'm interested... -Ian Quote Link to comment Share on other sites More sharing options...
MONKEYmark Posted July 18, 2003 Share Posted July 18, 2003 will keep an eye on this thread as i want some fuel mods. dont know what i need. can you do a list of parts we need fuel pump walbro/uk spec? fuel pressure regulator? injectors upgraded fuel lines? eyefi keep asking these questions for us all Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 18, 2003 Share Posted July 18, 2003 Originally posted by eyefi im planning on running more than that my sensor can cope with about 32psi of boost My sensor goes to 45 psi but I sure as hell won't be running it!! Be careful Eyefi. You will either need to back your timing right off or run turbomax fuel. Quote Link to comment Share on other sites More sharing options...
eyefi Posted July 18, 2003 Author Share Posted July 18, 2003 u dont need lines just yet, u dont really need bigger injectors yet. it just depends what yr happy with. the problem ive got is the spending has to stop so after this, thats it for me (jesus, that really pained me to say that). so i need to get it right this time. all my notions for cosmetic mods have had to go out the window. Quote Link to comment Share on other sites More sharing options...
eyefi Posted July 18, 2003 Author Share Posted July 18, 2003 Originally posted by Terry S My sensor goes to 45 psi but I sure as hell won't be running it!! is that absolute tho, mine'll do that i knew as soon as pressed post that someone would have to say that . nah i wont (cant) b running 30 odd psi of boost, but i will b running more than 18. Originally posted by Terry S back your timing right off or run turbomax fuel. i have fuel plans Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 18, 2003 Share Posted July 18, 2003 There is a practical limit on both lines & injectors. If you are doing it properly the injectors should change, the FPD should be removed. There are limits to a -6 line also. Two would be nicer. You should hear the noise form my - 6 stock return line with two -6 lines feeding the rail. I may need to to change the return to -10 I think. It all depends on goals Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 18, 2003 Share Posted July 18, 2003 Originally posted by eyefi i have fuel plans I hope you have sensor plans too then:eek: Quote Link to comment Share on other sites More sharing options...
eyefi Posted July 18, 2003 Author Share Posted July 18, 2003 Originally posted by Terry S I hope you have sensor plans too then:eek: oooh, u should see my plans Quote Link to comment Share on other sites More sharing options...
eyefi Posted July 18, 2003 Author Share Posted July 18, 2003 Originally posted by Terry S There is a practical limit on both lines & injectors. If you are doing it properly the injectors should change, the FPD should be removed. There are limits to a -6 line also. Two would be nicer. You should hear the noise form my - 6 stock return line with two -6 lines feeding the rail. I may need to to change the return to -10 I think. It all depends on goals the stock lines should b fine for my needs tho, shouldnt they? i hope so. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 18, 2003 Share Posted July 18, 2003 Depends what you are trying to achieve, & how safely. Quote Link to comment Share on other sites More sharing options...
MONKEYmark Posted July 18, 2003 Share Posted July 18, 2003 so is there an idiots guide to what one could do from scratch to jap fuel system eyefi you have changed a few things and sensors also the map sensor i think its called. does that allow you to run more boost. i would like to do some but dont know where to start. and dont say the begining what would you need to run say 1.4 bar along with cooling mods. and electronic boxes or ecu i know this is where it starts to get expensive. thanks theres some monkey coffee in it for you Quote Link to comment Share on other sites More sharing options...
eyefi Posted July 18, 2003 Author Share Posted July 18, 2003 Originally posted by Terry S Depends what you are trying to achieve, & how safely. leons pump & reg, 22-24psi, big inj (like we spoke about), stock rail, hybrids. something between 400-500hp. doesnt have to b perfect, but not a constant concern everytime u get on it. surley those lines will b fine. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 18, 2003 Share Posted July 18, 2003 stock lines will be fine at 500 bhp Monkey, it's all about octane & compression ratio's. 19 psi seems to be the limit for our 8:5 :1 engine on Optimax with stock ecu. Larger injectors won't change that. Quote Link to comment Share on other sites More sharing options...
Thorin Posted July 18, 2003 Share Posted July 18, 2003 but then you could fit a thicker head gasket and run higher boost on optimax? Quote Link to comment Share on other sites More sharing options...
Thorin Posted July 18, 2003 Share Posted July 18, 2003 Originally posted by eyefi the problem ive got is the spending has to stop so after this, thats it for me (jesus, that really pained me to say that). so i need to get it right this time. all my notions for cosmetic mods have had to go out the window. Stop spending money on your car and get that downstairs toilet sorted! ...oh and the windows, and.... Quote Link to comment Share on other sites More sharing options...
eyefi Posted July 18, 2003 Author Share Posted July 18, 2003 Originally posted by Thorin Stop spending money on your car and get that downstairs toilet sorted! ...oh and the windows, and.... shes brainwashed u! Quote Link to comment Share on other sites More sharing options...
Thorin Posted July 18, 2003 Share Posted July 18, 2003 Originally posted by eyefi shes brainwashed u! You should never have left me alone with her! I've even been thinking about painting the front room this weekend. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 18, 2003 Share Posted July 18, 2003 Originally posted by Thorin but then you could fit a thicker head gasket and run higher boost on optimax? True but then you'd lose low down response. It seems an expensive way to run a *bit* more boost. Quote Link to comment Share on other sites More sharing options...
Adam W Posted July 18, 2003 Share Posted July 18, 2003 On pump fuel, where is the point where the ignition retard at high boost becomes so great that you don't actually make any more power as the boost goes up? Terry, do you run one line from each pump all the way to the rail or do the two join into one line, run under the car, then go back into two? I was planning on doing it the first way, but I've heard that most people do the second, can't see why though. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 18, 2003 Share Posted July 18, 2003 Originally posted by Adam W Terry, do you run one line from each pump all the way to the rail or do the two join into one line, run under the car, then go back into two? I was planning on doing it the first way, but I've heard that most people do the second, can't see why though. 1 line from each pump right the way to either end of the fuel rail. Each line has a filter. You can buy weld on bosses if you need a -6 connection at the other end of the rail. 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.