injector upgrade for FP18g turbo - Subaru WRX Forum
 
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post #1 of 15 Old 01-18-2009, 09:54 AM Thread Starter
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injector upgrade for FP18g turbo

hey everyone,
As some of u guys know from my last post i have upgraded from a VF39 to an FP 18G TD06 turbo.I am about to soon get my car tune and was wondering if i should get bigger injectors than my STI pinkies ( 550 cc ) ?Please would appreciate any advise on this as usual.
thanks.
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post #2 of 15 Old 01-18-2009, 10:30 AM
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yea you do have to upgrade your injectors.

people with sti's that have an 18g upgrade theirs.

i would go with a 650 or 700ish cc flow rate because they idle slightly better from what ive read unless you plan on getting bored with an 18g and upgrading later. but if you ask me you picked the perfect turbo for the 2.0 i wouldn't use any more than that for a street setup. good choice

rollin on 17's now and they're dirty
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post #3 of 15 Old 01-18-2009, 01:12 PM Thread Starter
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thanks for that bro, i did alot of research bebore picking that turbo, also good bang for the buck.
Ok so i should be looking for something ard 650 to 700 cc injestors, but apart from good idle what esle would i be benefiting from?........ performance wise ? also what brand injectors should i go with out there?
thanks .
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post #4 of 15 Old 01-18-2009, 02:19 PM
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boost 556, why did you choose the td06 housing as opposed to the td05 housing on the 2.0 block?? from my understanding a td05 housing would spool quicker than a td06 and be a lot less laggy.
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post #5 of 15 Old 01-18-2009, 02:30 PM Thread Starter
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Quote:
Originally Posted by 04paulieWRX View Post
boost 556, why did you choose the td06 housing as opposed to the td05 housing on the 2.0 block?? from my understanding a td05 housing would spool quicker than a td06 and be a lot less laggy.
well it has a TD05 housing, but with a TD06 turbine wheel for more top end so its not that laggy at all, the blades are much bigger.
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post #6 of 15 Old 01-18-2009, 04:32 PM
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This "graph" is from Jscspeed. Gives the turbo size, estimated HP and the size of injector(s). You really dont want to starve the engine or over work the injectors (injector duty cycle), its just a safe thing to consider.

WRX Fuel injector sizing guide STi Fuel injector sizing guide Lgt fuel injector sizing guide, JSC Speed

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
Cobbtuning.com"
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post #7 of 15 Old 01-18-2009, 07:47 PM Thread Starter
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Originally Posted by newtothegame View Post
This "graph" is from Jscspeed. Gives the turbo size, estimated HP and the size of injector(s). You really dont want to starve the engine or over work the injectors (injector duty cycle), its just a safe thing to consider.

WRX Fuel injector sizing guide STi Fuel injector sizing guide Lgt fuel injector sizing guide, JSC Speed
thats some helful info thanks newtothegame, will show this to my tuner so i can get the ball rolling.
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post #8 of 15 Old 01-18-2009, 08:10 PM
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Hey Boost, thats why we are here. Just glad I could help out some.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
Cobbtuning.com"
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post #9 of 15 Old 01-19-2009, 08:55 PM
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I have the P.E. 1820 which is very similiar to an 18G and i have the P.E. 650cc Injectors, and i just got a opensource tune done today, and the car is running amazing. The tuner who did it said the 650cc were a good size and flow for the turbo.
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post #10 of 15 Old 01-19-2009, 10:12 PM
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All depends on the tuner. I talked with vroompa from apollo performance out here in so cal, and hes got a 20g with RC 650cc's.Hes @ 21psi and his injectors are @ 80% duty cycle. So it all depends on the tuner. Check with the tuner, the better the tunner, the less fuel he'll need. Oh and HB Speed tuned his ride.!
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post #11 of 15 Old 01-21-2009, 10:23 AM Thread Starter
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well i will be buying the injectors from the tuner shop, the guys there recommend the 750cc Deatschwerks injectors so i hope this will do good with my tuning.
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post #12 of 15 Old 01-21-2009, 11:17 AM
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I have dwerks 650cc injectors and I am very happy with them. I havent had any problems. I would recommend them
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post #13 of 15 Old 01-28-2009, 02:27 AM
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I'm running 750cc deatchwerks injectors with my FP EvoIII16g. Not sure if this is any help but I got an E85 tune and I was at 85% IDC. Of course, running E85 takes approximately 30% more fuel, so that size should be more than enough for you (assuming you're just tuning for regular fuel).
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post #14 of 15 Old 01-28-2009, 05:04 PM Thread Starter
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yeah i am tuning on 93 octane.
thank though
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post #15 of 15 Old 02-01-2009, 05:59 AM
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650's would work perfect, 750's are even better because they allow for a little upgrading if you decide to do so. Scaled down they can be tuned the same. I run a 20g with 800cc injectors and my car runs amazing.

As everyone else said, its all on the tuner.

*TBRex* 02 WRB WRX Wagon
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