iain2010 Posted November 10, 2006 Share Posted November 10, 2006 Hi, I have found some drop in 550 injectors that will fit straight into the original NA rail. With an uprated fuel pump will i get a significant power increase or will it just over fuel? Also has anyone fitted a power boost valve as on one website they claim a 12hp increase?!?! Quote Link to comment Share on other sites More sharing options...
heckler Posted November 10, 2006 Share Posted November 10, 2006 nope.. put it this way, 550's over fuel on my TT (going from 440's). Quote Link to comment Share on other sites More sharing options...
iain2010 Posted November 10, 2006 Author Share Posted November 10, 2006 I heard if you get a resister pack or something it stops the over fueling?!?! Quote Link to comment Share on other sites More sharing options...
adi2009 Posted November 10, 2006 Share Posted November 10, 2006 550 s on an NA is overkill. Your stock injectors are 330cc. Working at 80% duty cycle they would be capable of supporting 264bhp at the flywheel, and the NA is only 220 stock. 330's are plenty for your engine unless you are going the NA-T route. Quote Link to comment Share on other sites More sharing options...
Nic Posted November 10, 2006 Share Posted November 10, 2006 There is no need (or benefit) increasing the size of the injectors on an NA unless you are fitting a turbo. Quote Link to comment Share on other sites More sharing options...
heckler Posted November 11, 2006 Share Posted November 11, 2006 I heard if you get a resister pack or something it stops the over fueling?!?! resistor packs are only for fitting low impedence injectors to cars designed to take high impedence injectors - i.e. fitting UK spec 550's to a J Spec supe Quote Link to comment Share on other sites More sharing options...
RobSupra Posted November 11, 2006 Share Posted November 11, 2006 as has been said 550s are overkill, even on a basic na-t setup your 330s should be able to keep up. Quote Link to comment Share on other sites More sharing options...
Clarkey Posted November 11, 2006 Share Posted November 11, 2006 as has been said 550s are overkill, even on a basic na-t setup your 330s should be able to keep up. But running how much boost ? Quote Link to comment Share on other sites More sharing options...
mikeyb10supra Posted November 11, 2006 Share Posted November 11, 2006 Hi, I have found some drop in 550 injectors that will fit straight into the original NA rail. With an uprated fuel pump will i get a significant power increase or will it just over fuel? Also has anyone fitted a power boost valve as on one website they claim a 12hp increase?!?! as others have said there is no real need for them, uprated injectors are only needed if the engine requires more fuel input....ie if you have uprated your turbo etc Quote Link to comment Share on other sites More sharing options...
mikeyb10supra Posted November 11, 2006 Share Posted November 11, 2006 as has been said 550s are overkill, even on a basic na-t setup your 330s should be able to keep up. I definatly think upping to 440's would'nt go a miss imo Quote Link to comment Share on other sites More sharing options...
iain2010 Posted November 11, 2006 Author Share Posted November 11, 2006 Thanks guys, Thats cleared up a lot! Anybody used one of the power boost valves or are they a complete waste of time too for a stock NA? Quote Link to comment Share on other sites More sharing options...
dangerous brain Posted November 11, 2006 Share Posted November 11, 2006 Heres a question though. Could you use the bigger injectors with a mappable nitrous/safc type fitment to direct inject the fuel seperate from the gas??? Quote Link to comment Share on other sites More sharing options...
Max Headroom Posted November 11, 2006 Share Posted November 11, 2006 I posed the question a while back and the answer I got was there was no point in bothering with bigger injectors on an NA. So I didnt do it. Quote Link to comment Share on other sites More sharing options...
iain2010 Posted November 11, 2006 Author Share Posted November 11, 2006 Wow that is a dangerous brain!!! That went sooooooo far over my head!!!! Quote Link to comment Share on other sites More sharing options...
Clarkey Posted November 11, 2006 Share Posted November 11, 2006 Heres a question though. Could you use the bigger injectors with a mappable nitrous/safc type fitment to direct inject the fuel seperate from the gas??? Do you mean a dry shot ? Where the gas is not mixed with fuel prior to it being injected into the cylinders ? Aren't there kits out there that can do that anyway with progressive controller ? Though, I've heard a wet shot is safer. Quote Link to comment Share on other sites More sharing options...
dangerous brain Posted November 11, 2006 Share Posted November 11, 2006 LOL nitrous needs fuel so the engine doesn't cook. Alot of systems use single point injection, others use multipoint to try and get the right amount of fuel spread across all the cylinders. The best way of getting the extra fuel in would be to put it in via the cars injectors. If you could map an SAFC type thingumy in conjunction with a nitrous progressive or maybe even have a box that does both you'd have the best nitrous setup you could get methinks. Oh and nitrous is perceived as one of the better non forced induction method of improving N/A performance. Quote Link to comment Share on other sites More sharing options...
iain2010 Posted November 11, 2006 Author Share Posted November 11, 2006 Oh i c! So ur kind of saying if the NA was overfueling from using the bigger injectors it wouldnt be a problem if the right NOS system was being used? Quote Link to comment Share on other sites More sharing options...
Clarkey Posted November 11, 2006 Share Posted November 11, 2006 Ah! I see what you mean. Well, you could raise the fuel pressure on your injectors by x psi - making 330's act like 440's. Then use an SAFC-2 to trim the fueling. Quote Link to comment Share on other sites More sharing options...
RobSupra Posted November 11, 2006 Share Posted November 11, 2006 But running how much boost ? my injectors started giving trouble at 1bar of boost but seemed to keep up ok before that. Quote Link to comment Share on other sites More sharing options...
Clarkey Posted November 11, 2006 Share Posted November 11, 2006 my injectors started giving trouble at 1bar of boost but seemed to keep up ok before that. What single are you running ? Quote Link to comment Share on other sites More sharing options...
dangerous brain Posted November 11, 2006 Share Posted November 11, 2006 Oh i c! So ur kind of saying if the NA was overfueling from using the bigger injectors it wouldnt be a problem if the right NOS system was being used? No what I meant is like most have said the N/A won't be able to use the extra fuel bigger injectors provide unless you upgrade something in a major way. Nitrous is one way and I thought perhaps bigger injectors controlled when on nitrous input might be a better way to go than the way most systems are now, that is all. Just trying to justify your 550's for you lol. Quote Link to comment Share on other sites More sharing options...
Jake Posted November 11, 2006 Share Posted November 11, 2006 Anybody used one of the power boost valves or are they a complete waste of time too for a stock NA? Have a read of this thread mate : http://www.mkivsupra.net/vbb/showthread.php?t=70485 Quote Link to comment Share on other sites More sharing options...
RobSupra Posted November 11, 2006 Share Posted November 11, 2006 What single are you running ? its a ct26 off a earlier supra on custom manifold and piping 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.