Hello all,
since now all is good (well my injectors need a service) im looking at an upgrade in fuel system. Just wondering what the right size of injectors would be if i was looking to ultimately have 200kw atw max. They have 290, 375 and 450cc variants but i'm not sure how to work out what the best is.
Cheers, aj

If it's any help to you, Booya had standard 3.5L injectors in his turbo 3.0 making 300Kw. I think they're 330cc.

thanx for the reply, i wonder if the 3.5L would fit the original 6g72??? otherwise there is a big difference in price between the 375cc and the 290cc.

Does anyone know the stock ts 3L or te 3L injector sizes???

thanx for the reply, i wonder if the 3.5L would fit the original 6g72??? otherwise there is a big difference in price between the 375cc and the 290cc.

Does anyone know the stock ts 3L or te 3L injector sizes???
3.5L injectors do fit the 3.0, yes. Someone on here did it recently, Meh I thnk it was.

I want to know how you go with the injectors if you go with the ones from the 3.5L. I am looking at replacing mine, but I would be definately interested if I could fit some from a newer series. I also have the 6G72 engine and the last price I was quoted for injectors was huge.

does it prove to be a huge difference in power??? or is this where its just a simple.. more fuel/more air = bigger explosion?

not really, when you want to make power is where you want your injectors to be working optimally(??). The amount of fuel they put in is set by the ecu, so i really don't need bigger injectors now but i have to get new ones and i want to mod down the track...

Zaphod, i was talking gen 2 3L, but redav is going to bring some his old ones to check if they fit, then as 3.5L fit 3L 3rd gen....they will fit 2nd gen as well hopefully.

Anyone know the actgual sizes of stock injectors?

thanks

Zaphod, i was talking gen 2 3L
Erp, sorry dude. :(

sorry about the hell thread mine but i was thinking of doing this (3.5l injectors in my 3l 2nd gen).
this thread came up in a search (yes i actually used it!!).
not really enough info on benifits of doing , price of doing it , and members experience in doing it.

I have donned my flame retardant suit so fire away:D

sorry about the hell thread mine but i was thinking of doing this (3.5l injectors in my 3l 2nd gen).
this thread came up in a search (yes i actually used it!!).
not really enough info on benifits of doing , price of doing it , and members experience in doing it.

I have donned my flame retardant suit so fire away:D

i bought a DOHC instead lol

3.5 injectors are 275cc, there way to big for an astron without a different computer or different tune on the original computer there also a different design from astron injectors so you'll have to modify the fuel rail. Just keep the blue ones in your car, they'll be fine even for turboing, till a point. Then just get the biggest ones u can cause you'll have an aftermarket computer in your car then and they will not cause you problems.

3.5 injectors are 275cc, there way to big for an astron without a different computer or different tune on the original computer there also a different design from astron injectors so you'll have to modify the fuel rail. Just keep the blue ones in your car, they'll be fine even for turboing, till a point. Then just get the biggest ones u can cause you'll have an aftermarket computer in your car then and they will not cause you problems.

Is the 3.0L 6g72 (which i have) an astron motor? or are you thinking of the 4 cylinder one?
As far as i can figure out from the previous posts , the bigger 3rd Gen injectors should fit into my 2nd Gen V6.
Im just wondering how much they cost and would i have to get a bigger fuel pump or something? I already have the o/s throttle body.
Anything else i would need to get the most out of them or is the whole idea just not worth the time?
Any feedback or opinions from people that have done it would be sweet.
Bear in mind also that i dont plan on turbo'ing , just trying to do stuff.... couple hundred bucks at a time....

should be able to get all 6 for around 100$ from memory, peter got 3.5's in his 3rd gen 3L when fitting the interceptor.

cheers for that mate.
i will look into it

Is the 3.0L 6g72 (which i have) an astron motor? or are you thinking of the 4 cylinder one?
As far as i can figure out from the previous posts , the bigger 3rd Gen injectors should fit into my 2nd Gen V6.
Im just wondering how much they cost and would i have to get a bigger fuel pump or something? I already have the o/s throttle body.
Anything else i would need to get the most out of them or is the whole idea just not worth the time?
Any feedback or opinions from people that have done it would be sweet.
Bear in mind also that i dont plan on turbo'ing , just trying to do stuff.... couple hundred bucks at a time....

The Astron2 is the 4cyl motor in the 1st and 2nd gen magnas (3rd gens have a different version), Gotrice's TS has the DOHC import 6G72 3L (just like in KB's TR) so his is more powerful than our 3L just because of the DOHC.

If you fit bigger injectors and do not tune your ECU (With an AFR ECU/e-manage blah blah) they'll still pump the same amount as your old ones but you'll have room to move since you'll have a bigger limit to work with.

Basically, unless your going absolutely nuts NA (which you i assume from what you've written that your not gonna spend a few grand on allmotor mods), just stick with the stock injectors because you'll never need to draw more then they can shoot, ever.

You wont need a bigger pump unless you get bigger injectors and unless your going forced induction or big NA mods you won't need this either. How ever sometimes performance parts are cheaper then genuine MMAL parts, which is kind of like.. saving money anyway even if you wont use the pump/injectors for the volumes it they meant for etc.. WITHIN REASON!

and for me - Do the 3.5 injectors have a better reaction time than the 3L's?
When peter got his fitted, did he NEED them with the inteceptor? (turbo?) wild cam? what was the reason?

If you fit bigger injectors and do not tune your ECU (With an AFR ECU/e-manage blah blah) they'll still pump the same amount as your old ones but you'll have room to move since you'll have a bigger limit to work with.


and for me - Do the 3.5 injectors have a better reaction time than the 3L's?
When peter got his fitted, did he NEED them with the inteceptor? (turbo?) wild cam? what was the reason?

Doubt the response is different. They accidently got 3.5 injectors and found the car was running rich...

If you fit bigger injectors with the same open cycle more fuel will be in as the larger injectors are open for the same amount of time the smaller injectors are... if that makes sense. From what i've read the 3.5L injectors could easily handle low levels of boost.

You wont need a bigger pump unless you get bigger injectors and unless your going forced induction or big NA mods you won't need this either. How ever sometimes performance parts are cheaper then genuine MMAL parts, which is kind of like.. saving money anyway even if you wont use the pump/injectors for the volumes it they meant for etc.. WITHIN REASON!

and for me - Do the 3.5 injectors have a better reaction time than the 3L's?
When peter got his fitted, did he NEED them with the inteceptor? (turbo?) wild cam? what was the reason?

now this is more like it! thanks guys for the info.

Wilder cams and port&polish ARE on the wish list eventually (unless i just give up the whole idea and give my car to my sister or something and get a better one - no point selling it, wouldnt get any money for it.)
Its just that i am having major power dramas at the moment. I am thinking it might be the fuel system ie: injectors need cleaning or fuel pump replaced or something.

If this is the case then i might as well just get newer bigger stuff instead of cleaning the old stuff. Does that make sense :)
But if it is just going to make things go even more pear shaped then theres no point.
From what you guys have said tho ... it couldnt hurt.

ps: the light vehicle fitter here at work suggested it might be an electrical prob as well ie: the button in the dizzy cap or something so i will look into upgrading all that as well.....:D

now this is more like it! thanks guys for the info.

Wilder cams and port&polish ARE on the wish list eventually (unless i just give up the whole idea and give my car to my sister or something and get a better one - no point selling it, wouldnt get any money for it.)
Its just that i am having major power dramas at the moment. I am thinking it might be the fuel system ie: injectors need cleaning or fuel pump replaced or something.

If this is the case then i might as well just get newer bigger stuff instead of cleaning the old stuff. Does that make sense :)
But if it is just going to make things go even more pear shaped then theres no point.
From what you guys have said tho ... it couldnt hurt.

ps: the light vehicle fitter here at work suggested it might be an electrical prob as well ie: the button in the dizzy cap or something so i will look into upgrading all that as well.....:D


The last is true. Check your ignition and sparking hardware, you might have fouling plugs (running rich -could equal a baked o2 sensor or MAF), your plugs might just be stuffed or your leads dead, and your dizzy cap might be worn right down. Something an hour at your local mechanics should be diagnosed.

If its your fuel pump i'd think your car would be more likely to surge, like its being starved of fuel - a faux-empty slurp or something.. However I am under the impression that pumps are very off-on animals, once its baked, she-no-go-captin.

Your fuel filter might be chockers? Your fuel lines might be stuffed.. I think perhaps you should look at the bigger picture not just your injectors or pump, it could even be an intake problem?? perhaps your throttle body is caked to the max and the butterfly wont open totally limiting your air intake and maximum rpm (and would also run rich).. Perhaps you should get your mum to rev the tits off your car and you see if your belching any smoke? (Blue is oil Black is fuel).

From what Gotrice said, I'd be inclined to stay with the 3L injectors, after all, you'd want to keep your fuel at an optimum and not rich (wasting money and horses) so 3.5 would be costly in more than just purchase price.

About cams, speak to Choonga, Black Beard and JasonsVRX, they all have, if not have had some nice cams in their NA mags so they'd be the "old hats" or "been there and done that" crew. First things though, you'll need a piggyback ecu (E-manage or Interceptor) which come to the party at about $1500 installed and dyno tuned (roughly) and your cams (SOHC) would come in at about 1 large so going NA isn't really saving ALL that much, however your insurance will be lower and you won't need those pesky (and expensive) engineers certs.

What i'm aiming for one day is something like this:

Engine: Medium cams, Piggy ECU, performance manifold, Lightened flywheel, improved intake and 2.5" mandrel exhaust

However i am planning on using a DOHC as a replacement motor as my 3L has clocked a tad over 210K which means I can say 'later' to the cams, piggyback and manifold as this engine will give the same hp gains with better economy and cost around the same!

From your profile, your magna should pull a decent figure over a stock magna, however your auto will be raping those figures all day. Pity. Manual = win.

The last is true. Check your ignition and sparking hardware, you might have fouling plugs (running rich -could equal a baked o2 sensor or MAF), your plugs might just be stuffed or your leads dead, and your dizzy cap might be worn right down. Something an hour at your local mechanics should be diagnosed.

If its your fuel pump i'd think your car would be more likely to surge, like its being starved of fuel - a faux-empty slurp or something.. However I am under the impression that pumps are very off-on animals, once its baked, she-no-go-captin.
Your fuel filter might be chockers? Your fuel lines might be stuffed.. I think perhaps you should look at the bigger picture not just your injectors or pump, it could even be an intake problem?? perhaps your throttle body is caked to the max and the butterfly wont open totally limiting your air intake and maximum rpm (and would also run rich).. Perhaps you should get your mum to rev the tits off your car and you see if your belching any smoke? (Blue is oil Black is fuel).

From what Gotrice said, I'd be inclined to stay with the 3L injectors, after all, you'd want to keep your fuel at an optimum and not rich (wasting money and horses) so 3.5 would be costly in more than just purchase price.

About cams, speak to Choonga, Black Beard and JasonsVRX, they all have, if not have had some nice cams in their NA mags so they'd be the "old hats" or "been there and done that" crew. First things though, you'll need a piggyback ecu (E-manage or Interceptor) which come to the party at about $1500 installed and dyno tuned (roughly) and your cams (SOHC) would come in at about 1 large so going NA isn't really saving ALL that much, however your insurance will be lower and you won't need those pesky (and expensive) engineers certs.

What i'm aiming for one day is something like this:

Engine: Medium cams, Piggy ECU, performance manifold, Lightened flywheel, improved intake and 2.5" mandrel exhaust

However i am planning on using a DOHC as a replacement motor as my 3L has clocked a tad over 210K which means I can say 'later' to the cams, piggyback and manifold as this engine will give the same hp gains with better economy and cost around the same!

From your profile, your magna should pull a decent figure over a stock magna, however your auto will be raping those figures all day. Pity. Manual = win.


yeah man the surging is pretty much what is happening. sometimes it goes well up untill 2k rpm then just completely dies in the @rse for a few seconds , almost like a stall but the revs just stay at 2k and then it will rev out to 3 - 3.5k.
other times it just sort of hiccups its way up to 2k rpm then is ok. i can see the tacho just sort of bouncing its way up at mabey a couple of hundred rpm at a time. thats why im thinking fuel dramas. But then the other third of the time it just runs perfectly.:confused:

As for the throttle body it is still fairly new O/S one from RPW so...

I totally agree with the auto/manual thing :D . a conversion had crossed my mind but i think just a new car would be a better option:cry:

I totally agree with the auto/manual thing :D . a conversion had crossed my mind but i think just a new car would be a better option:cry:

Word, Just do a Black Beard and get a new magna and swap all your parts over.

Perhaps your mods are screwing with your ECU? Maybe a dyno session might give some answers?

3.5 injectors are 275cc, there way to big for an astron without a different computer or different tune on the original computer there also a different design from astron injectors so you'll have to modify the fuel rail. Just keep the blue ones in your car, they'll be fine even for turboing, till a point. Then just get the biggest ones u can cause you'll have an aftermarket computer in your car then and they will not cause you problems.
I was under the impression that the Astron injectors were around 330cc. I'd be surprised if the 3.5's were bigger, as the astron ones have to service more volume.
ie 2600/4=650
3500/6=583

I was under the impression that the Astron injectors were around 330cc. I'd be surprised if the 3.5's were bigger, as the astron ones have to service more volume.
ie 2600/4=650
3500/6=583

I'd agree with that, bigger volume over less pots. Also a lot of people turbo and drag the astron's so no doubt you can get garden hose sized ones that will fit.

well i put some new spark plug leads in (bosch super sports inductive core or some crap like that) and i am pretty sure it does feel a bit "stronger" mabey , but the original problem is still there so i am reckoning that it deff is the fuel system.

can anyone reccommend a place in perth that cleans injectors or even sells them?
how long would it take for them to clean them do you reckon?
is it just a drive there and leave it with them for an hour or so kind of deal?

cheers y'all