440cc Injectors Good Idea With My Mods?

honestabe

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Jan 15, 2006
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I'm running the stock 370cc injectors right now on my 1J. I have a cold air intake, 3" Driftmotion downpipe, 3" catless 935 Motorsports exhaust system with Megan Racing GT muffler, 1-piece aluminum driveshaft, ACT clutch kit, and a Koyo radiator with a stock ECU. I'm currently running around 14 PSi of boost on stock twins. Question is, would it be a good idea to upgrade to the 440cc injectors now?

I haven't had a chance to dyno my car yet, so I'm not sure what I'm running power wise (I'm thinking 300 rwhp, but I cannot say for sure).

Adam
 

SirLoki

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Aug 8, 2007
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honestabe said:
If Brian Urbano is saying stay stock for now I'll listen. Thanks guys.

Adam

hah im flattered but tissimo and drewgo said it first!

440s max out at about 400 rwhp safely, my gen 4 with jdm 2jzgte and stock 440s running 19psi on stock twins topped the dyno at 403 rwhp through the automatic on 100 octane, stock ecu, but the afs were running as high as 12.5-13.0....
 

tlo86

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honestabe said:
I know Brian. Tissimo and drewgo aren't newbs either. With 3 good standing members such as yourselves saying to stay stock, I will listen.

Although I do find it amazing that you just now joined SM. Welcome btw.

Adam

its because sm loads and runs very fast :) :biglaugh:
 

drewgo

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HIDPLANET said:
All good info but is there any harm in running JDM MKIV 440s with stock twins for now, with the forethought of upgrading turbos later?

That's a negative batman. You'll never max out the the 440's with stock twin, but you can push them really hard to come close to that.
 

honestabe

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Would I be correct in saying that if you run a set of 440s on a setup like mine you'll just run rich? Would I also be correct in saying that if I did install 440s it would be safe to use them and that I don't have to worry about anything due to running too rich?

Adam
 

OneJoeZee

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honestabe said:
If Brian Urbano is saying stay stock for now I'll listen. Thanks guys.

Adam

No offense to Brian, because he knows his stuff and I agree with him, but you need to understand reasons why statments are made. Believing anything just because someone told you, no matter who it is, is bad a practice. Even when Jose gives me advice and information, I ask why. Information is next to useless if you don't really understand it yourself.

Anything over 340-350, I would suggest upgrading the injectors.

Stock injectors can support that power, yes, but that is assuming your injectors are flowing full and clean. These injectors are 15 years old. One or more injectors may be flowing really low. With your mods, stock injectors will be ok. But if you wanted to push more power into the 350ish range you should have them cleaned to make sure. If you had a couple bad injectors, a tank of bad gas, a really hot day(with hot intake temps), a boost spike, or a boost creap and your whole engine is fucked. You might be on the edge and not even know it.

And if you're going to have a set cleaned and tested, you might as well test the 440s for future insurance. You could be in the same exact boat later on trying to push 400 with a single turbo. Another set of 15 year old injectors.

http://www.supramania.com/forums/showthread.php?t=45621

Look at this thread for example. If you were gonna push whatever setup you have to the 500hp area, I bet you would want to know your injectors were only 450cc.



Ok, so long story short, I agree with what's been said. You'll be fine with stock injectors. But if you wanted to push more, be careful what you do with unknown 15 year old injectors.
 
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Bondango

Supra Specialists Ireland
Dont know if it has been mentioned on this thread, but if going with jspec 440cc injectors, use the map sensor from the jspec 2jzgte aswell, it will rescale the % difference in injectors enough that your not needing to trim a lot of fuel, as well as raise the Stock BC.
 

honestabe

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Thanks for the information Joe. Right now I'm done with upgrades due to being kicked out of the military for medical reasons. Although I do know my motor runs smooth as hell. I run only Shell, Chevron, or Texaco gas through my car due to having Techron in it (which in a recent discussion on this forum was agreed to be the best addative in the industry). I will stick with the stock injectors for now, although I will look into getting them cleaned and flow tested. Thanks all.

Adam
 

drewgo

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Bondango said:
Dont know if it has been mentioned on this thread, but if going with jspec 440cc injectors, use the map sensor from the jspec 2jzgte aswell, it will rescale the % difference in injectors enough that your not needing to trim a lot of fuel, as well as raise the Stock BC.

I would not do that. The Map is relative the ECU not the injectors.
Keep 1j with 1j. Let the Ecu compensate for the upgrade. If it can't compensate then you'll need add'l device such SAFC or EMU to correct the Fuel map. But in this case 440cc are within the correction of the Stock ECU therefore you'll be fine with it. You can check it on the dyno, but 440cc don't run rich with the stock set. Which indicates that the ecu does keep the car on tune. And when boost comes online there is plenty of fuel if need be.
Again, this is what I've done.