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Old 01-21-2013, 05:26 PM   #1
living the dream
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Default hp to injector ratio help

Okay guys First post ever and i am stoked to be apart of this great forum you guys are all amazing and a great help! (Typing this from a cell phone so bare with me, and also just learning my way around the forums) Okay need an idea of what my car will put down on the dyno just opinions. Here goes-2007 wrx tr 60k miles Vf43 port and polished (pnp) Intake manifold pnp Tgv deletes pnp Exhaust manifold pnp Throttle body pnp Grimmspeed up pipe (gs) 3 port boost solenoid gs 8mm phonelic spacers gs+ 3mm k spec spacers 38mm tial ewg Invidia turbo back catless bellmouth 255 walbro Aerometer fpr Perrin fmic Perrin fuel rails K&N intake Step colder plugs Aquamist water/meth kit 6 series (with and without the kit)

All these parts are in the basement awaiting the install!!! aside for the tbe stage 2.cobb tune Still running stock tr injectors 550cc* will they hold or what injectors do you perfer ( i can get a set of 1000 cc off a friend or is that a little over kill?! Stock clutch..i baby it Fully braced car on tein coilovers Thanks for any input you have guys!!

Thanks again
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Old 01-21-2013, 05:27 PM   #2
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Well i have been scanning the forums about my injector dilemma and i came up with that my stock tr 550's can be modified to a high 7+ low 8- cc, but the sprays will be less atomized and more direct stream. I also found that the 1000cc are almost the same problem more direct spray less atomization.. my question is.. should i save my money mod my stocks, or spend the cash and do the 1000s and kind of have the same dilemma..

Opinions are very welcome and if someone could guide me to the correct part of this forum to post these questions i would really apperciate it.

I know its heard alot but......is this mod list capable of 400hp (dont tear my head off lol)
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Old 01-21-2013, 05:38 PM   #3
tommyson01
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This question should be addressed to the person who will be tuning your car for all of the listed parts, not some Internet forum jockeys.
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Old 01-21-2013, 05:43 PM   #4
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nice setup pretty much what i have except its going into an 1800 lb car and being tuned on e98 but yeah 1000's are most likely overkill but would work if you have a good tuner, but generally 650's or 750's would be good but the best thing to do is ask the person who is tuning it generally i always buy bigger so you dont run out of injector but again i always buy to run e85 so it requires more fuel but if i had to guess id say with your setup with the 50/50 meth i would say 320-330 hp to the wheels as well as 340-350 ft lbs of torque would be attainable depending on the agressiveness of the tune so if your asking in wheel horsepower not a chance on that turbo if youre talking at the flywheel yes
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Old 01-21-2013, 06:26 PM   #5
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So in all reality just mod my stock 550s and save the money
That's what im scared of as well running out of fuel on the dyno.
I will take to my tuner (Nate at tpg tuning Pennsylvania) see what he has to say about the set up just curious of what you guys thought or had to offer in opinion..i was expecting more hp then 350+ it is the tr 2.5 block and 2.0 heads.

Again thanks for the input guys
Keep the good ideas and recommendations coming!!
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Old 01-21-2013, 06:32 PM   #6
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the vf series turbos arent good for a large amount of hp torque on the other hand yes knowing now that you have the 2.0 heads it might not even be as much as i stated since the 2.0 heads would flow less than the 2.5 heads i mean its definitely doable but its going to take pretty much every mod as well as a little more aggressive tune
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Old 01-21-2013, 07:57 PM   #7
living the dream
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Hmm..
My understanding of Just a basic hp rating on the mods
Vf43+50hp+pnp 65hp
Fmic+25 30hp
Ewg+20hp
Tgvs+15hp
Spacers+8hp
Exhaust mani pnp+8hp
Intake mani pnp+5
Throttle body+8
Water meth+35
The meth kit should help cool the boost so you would be able to push a few more psi out of the turbo without it being super hot air..the vf turbo may take a beating but it should hold.
If im only looking at 350- then the injectors should hold up fine from my understanding..
Well i hope but i may still debate on the injector mod if no one has anything to say about it..
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Old 01-21-2013, 07:59 PM   #8
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The 2.0 heads on 2.5 produce more torque from what i understand.
The Frankenstein swap*
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Old 01-21-2013, 09:20 PM   #9
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Any input fella's?!
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Old 01-21-2013, 09:30 PM   #10
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I'd personally go with 1000cc injectors so that you have room for e85 in the future. Ethanol flows more, which requires a higher cc injector (approximately 30% more than required for regular octane gas) and results in less mpg. There's a nice little webpage that explains the approximate sizes needed for running mods on both octane and ethanol... give me a sec to find it.

EDIT:
Here it is
http://www.ecmtuning.com/wiki/e85fuel

Last edited by Mr Wrex; 01-21-2013 at 09:38 PM.
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Old 01-21-2013, 09:53 PM   #11
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I would love to go e85! Exceptt..im the only Subaru in my town (very small country town) and a station is over an hour away..sucks
So meth is the best i can get for now..
1000cc i can get from a friend but he said they require a tune after install because of the sprays this true?
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Old 01-21-2013, 10:00 PM   #12
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Quote:
Originally Posted by living the dream View Post
I would love to go e85! Exceptt..im the only Subaru in my town (very small country town) and a station is over an hour away..sucks
So meth is the best i can get for now..
1000cc i can get from a friend but he said they require a tune after install because of the sprays this true?
A tune is definitely needed. Whoever tunes your car will send you a limp map to drive to their shop with. You'll want to stay out of boost while on this map.

If you really wanna do e85, buy a few drums and store it in your back yard
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Old 01-21-2013, 10:27 PM   #13
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Nate at tpg tuning will be the mastermind tuning my car!!
Whats the price difference in e85 compared to 93 octane?! I know everywhere has different prices but on an average?
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Old 01-21-2013, 10:31 PM   #14
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e85 is typically cheaper, but since it flows more than octane fuel it comes out to about the same price in terms of mileage. Near me, e85 is $3.15 whereas octane 93 is $4.10. When I compare the flow differences between the two, e85 is barely cheaper, but the power it gives makes it worth the increased gas station visits.
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Old 01-21-2013, 10:47 PM   #15
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What your average mpg on e85 i know u stated alot more visits to stations and the flow is increased
You just have me curious now lol..and the available hp boost in e85
i know i can search for all this just want to ask you personally.. pro's and con's?
Thanks for your time and info Mr Wrex
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Old 01-21-2013, 10:56 PM   #16
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There's plenty of benefits of e85, just search for em
Because e85 is a lot more fun to drive with, I usually go WOT a lot more than I would with oct93. This makes it hard to compare the two from my side, but it's safe to say you'd use e85 25% faster than gas.
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Old 01-21-2013, 11:00 PM   #17
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Quote:
Originally Posted by living the dream View Post
The 2.0 heads on 2.5 produce more torque from what i understand.
The Frankenstein swap*
I disagree maybe in relation to horsepower it will make more on a 2.0 but I don't think you'll hit 350 whp torque yea not hp unless of course you use every possible bolt on and if you use e85 yea and of course it depends on the dyno etc etc e85 possibly but again it's going to have to be a fairly aggressive tune and at that point your pushing the efficiency range of the turbo
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Old 01-21-2013, 11:41 PM   #18
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The meth will cool the more hotter intake temps produced by the now working harder turbo..yes the turbo will definitely take a beating but it will take it and i baby my car (in my eyes).
Im now looking up the closest e85 station hopefully by now they have one closer.
I would do an 18 or 20g but i got the vf43 with the car so cant beat it.
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Old 01-22-2013, 12:01 AM   #19
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You may not want to do meth... look into 50/50 mixes and pure meth setups and you'll see what problems you may run into, like running with no meth and/or limp mode failsafe or fire... lots and lots of fire. If you're concerned with temps under the hood, just heat wrap and/or ceramic coat the f$%k out of everything exhaust related, like the turbo, DP, UP, and header. Then slap heat reflective tape on your intake and intercooler.
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Old 01-22-2013, 12:16 AM   #20
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I got the aquamist 6 series meth water kit. Its purely a work of art, boost cut failsafe, wastegate pressure cut, full read out flow and operation gauge everything!!
Im looking to pull extra psi of boost, steam clean the block, and cool intake temps.
I ceramic powder coated hot side of the turbo and wrapped it.
The up pipe is ceramic coated from grimmspeed and heat wrapped.
Downpipe is ceramic powder coated and very thick hi temp heat wrap with a sealer to fight the water and debris from the road.
The tial ewg is also liquid cooled
The perrin ic piping is also powder coated from perrin (but it should help some)
Engine bay should stay pretty cool
Plus the greddy extrrnal oil cooler
Im still just disappointed i wont come closer to that big 4-0-0 number.

Thanks for all the help guys.
Just keep the good info coming fellas
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Old 01-22-2013, 12:19 AM   #21
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maperformance has barrels of e98 on their site....just sayin lol
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Old 01-22-2013, 04:23 PM   #22
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Closest e85 station is 45 min..
Im really trying to milk every possible hp bolt on that i can out of this car..
My wifes father decided that since he dont use it ever he would give his whole nitrous kit (nos) out of his 72 nova as long as i pull it out..(going to use it for a co2 spray)
Soo...im going to fab up a custom fuel chiller box and coil my fuel lines through it, and a front mount sprayer kit.. that should help some!!
Any thoughts?
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Old 01-22-2013, 04:31 PM   #23
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If the station is really that far, I'd get a map for both e85 and octane 91 or 93. Definitely helps when you're in a pinch and need to change fuels. Read up on the e85 FAQ and get a really good understanding of the pros and cons before you decide to go this route.
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Old 01-22-2013, 04:45 PM   #24
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I mean until a station cones closer to me im just going to run 93 just seems more reasonable for the time being..
Just keep adding as many bolt ons and simple ways to free up hidden hp..
The fuel chiller and ic sprayer set up isnt setting me back anything free mod so.i figured why not use it
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Old 01-22-2013, 04:48 PM   #25
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There are injector flow rate and engine hp calculators here: http://www.injector.com/injectorselection.php

No idea if they're any good.
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