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Old 04-30-2011, 10:13 PM   #1 (permalink)
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Default Are 1000cc injectors too big?

I bought a set of 880cc precision injectors for my build (aiming for ~330 whp) but after sending them to injector rehab they told me they were 1000cc injectors...

Just wondering if they're too big, will i have trouble getting the engine to idle with 1000cc injectors and a 255 pump?

any input would be appreciated, just a bit worried and would like anyone with more knowledge to chime in.

Thanks.
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Old 04-30-2011, 10:16 PM   #2 (permalink)
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im going to tell you this, atleast you arent my friend who bought precision 525cc injectors and they turned out to be dsm 390cc injectors.

your tuner shouldnt have a problem getting them to idle... hell i didnt have a problem getting 1000cc injectors to idle
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Old 04-30-2011, 10:30 PM   #3 (permalink)
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Nope. You can just run them at a lower cycle duty and you'll be good.
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Old 04-30-2011, 11:29 PM   #4 (permalink)
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Theyre gonna suck idling if you run gas. But on ethanol, youll never notice.
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Old 04-30-2011, 11:48 PM   #5 (permalink)
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ill be honested. id switch them out for something smaller. yes you can tune them down a bit but you can only do that so much. think of it this way. "Dsm 450cc blue tops" are maxed out at ~300ph.
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Old 05-01-2011, 05:27 AM   #6 (permalink)
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Originally Posted by theidealone View Post
Theyre gonna suck idling if you run gas. But on ethanol, youll never notice.
this. on E85 they run great but for your hp goal i would look for something around 550cc, on pump gas those would be plenty...
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Old 05-01-2011, 08:38 AM   #7 (permalink)
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If your tuner is any good, they'll work and idle fine.
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Old 05-01-2011, 08:41 AM   #8 (permalink)
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I idle my precision 1000s and walbro 255 just fine. You have no worries.
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Old 05-01-2011, 12:51 PM   #9 (permalink)
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OBD0 ECUs can't idle injectors that large, but if you are OBD1 it should be fine.
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Old 05-01-2011, 07:47 PM   #10 (permalink)
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Originally Posted by The_Acid_Beaver View Post
OBD0 ECUs can't run pulse widths low enough to idle injectors that large, but if you are OBD1 it should be fine.
Beave - Can't base pressure can be dropped to bring flow rates down at PWs that are achievable with obd0 ecu's? Spray pattern suffers, but how important is atomization at idle anyways? Your TE knowledgabilities and experience are way beyond what mine are, just wanting to make sure my plan (big injectors) is possible with TE.
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Old 05-02-2011, 04:07 AM   #11 (permalink)
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If you have to pass emissions testing at idle and low speeds, spray pattern is extremely important.

750cc injectors are about the largest you can run on TE without pressure manipulation. I think it's possible to run 1000cc injectors successfully this way, but you'll want to get a rising rate regulator to quickly ramp up the pressure and also make sure your pump will handle the additional pressure.
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Old 05-02-2011, 06:21 AM   #12 (permalink)
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I'm running Bosch EV14 1000's (ID1000's)on a s300 and it idles smoothly at 800rpm
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Old 05-02-2011, 08:00 AM   #13 (permalink)
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If your tuner is any good, they'll work and idle fine.


This!!
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Old 05-02-2011, 08:48 AM   #14 (permalink)
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Originally Posted by hyboost View Post
I'm running Bosch EV14 1000's (ID1000's)on a s300 and it idles smoothly at 800rpm
Those are badass injectors, so it's a given that they'll idle fine.
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Old 05-02-2011, 12:34 PM   #15 (permalink)
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Old 05-02-2011, 01:59 PM   #16 (permalink)
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You dont even need 880CC injectors for 330hp LOL.
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Old 05-02-2011, 02:11 PM   #17 (permalink)
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Does the fact I live 3500 above sea level make any difference? The air is a little thinner up here.

So far it's looking like i'll be alright. guys with first hand experience with 1000cc injectors was what i was after.


Thanks to all those that replied. you're all gettin' repped.
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Old 05-02-2011, 02:58 PM   #18 (permalink)
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Used Precision 1000s on E85 myself...idled fine, and had no issues. Fuel pressure set at 58psi with a single in-tank HP 255.
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Old 05-03-2011, 08:11 AM   #19 (permalink)
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sell them and get some blue tops
make some money off them
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Old 05-03-2011, 09:16 AM   #20 (permalink)
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lowball runs precision 1000's and it idles just fine.

i dont think many people in here have used them or maybe they just dont know how to tune fuel injector offsets
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