injectors for high compression 2.2
04-15-2003, 07:23 PM
#1
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injectors for high compression 2.2
hello everyone, new to the board here...
i was hoping i could get some advice...
i am in the process of building a 2.2 for my 93 legacy. mods done by paeco engineering are 11-1 high comp. ceramic coated pistons, ported and polished heads, torque cams, high speed valve springs, lightened flywheel... internal engine components balanced as well.
heres my current question involving injectors: i know i am going to need to run a larger injector so that i can keep my mixture rich enough for the high comp. pistons. i was told that turbo legacy injectors would be a good swap for this, as they flow better than the non-turbo legacy injectors. would stock wrx injectors also be a viable swap?
any advice or comments are welcomed and appreciated!
joshmould
i was hoping i could get some advice...
i am in the process of building a 2.2 for my 93 legacy. mods done by paeco engineering are 11-1 high comp. ceramic coated pistons, ported and polished heads, torque cams, high speed valve springs, lightened flywheel... internal engine components balanced as well.
heres my current question involving injectors: i know i am going to need to run a larger injector so that i can keep my mixture rich enough for the high comp. pistons. i was told that turbo legacy injectors would be a good swap for this, as they flow better than the non-turbo legacy injectors. would stock wrx injectors also be a viable swap?
any advice or comments are welcomed and appreciated!
joshmould
04-26-2003, 05:50 PM
#4
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Hey,
Im running 11:1 comp pistons in my RS along with every possible N/A enigne machining possible. Its a 2.55L fully closed deck block, custom forged internals, knife edged/blaanced/lightend crank, ported heads, valves, springs retainers, cams, everything, you get the picture!
I have stock fuel injectors, but I have an upgraded fuel pump and a SVX fuel pressure regulator to lower the pressure in the rails, it was impossible to tuen before the SVX regulator, toomuch fuel no matter what we did with the unichip.
Anyway, the car tuned fine for the break in period, but Im going back monday to tune up to 8,500 rpm redline, so Ill get back to you to tell you how it goes. But fuel wasnt a big problem so far.
ill get back to you.
dan
Im running 11:1 comp pistons in my RS along with every possible N/A enigne machining possible. Its a 2.55L fully closed deck block, custom forged internals, knife edged/blaanced/lightend crank, ported heads, valves, springs retainers, cams, everything, you get the picture!
I have stock fuel injectors, but I have an upgraded fuel pump and a SVX fuel pressure regulator to lower the pressure in the rails, it was impossible to tuen before the SVX regulator, toomuch fuel no matter what we did with the unichip.
Anyway, the car tuned fine for the break in period, but Im going back monday to tune up to 8,500 rpm redline, so Ill get back to you to tell you how it goes. But fuel wasnt a big problem so far.
ill get back to you.
dan
04-26-2003, 07:15 PM
#5
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thanks!
hey dan, thanks for the help!
if you think that running stock 2.2 n/a injectors will work ok for my application ill give it a try... if i cant get it to run rich enough i can always swap out... too lean isnt as dangerous as too rich, correct?
anyhow, what octane gas do you have to run? 93 should do it, but i wont know till i run the car...
i suppose that just running higher comp. pistons wont cause a need for too much extra fuel like running a turbo would
i got my waterpump, oilpump, sensors, and all that good stuff on friday, so monday i start the build! i had the shortblock assy. done for me, so all i have to do is the head job on up
thanks for the help!
if you think that running stock 2.2 n/a injectors will work ok for my application ill give it a try... if i cant get it to run rich enough i can always swap out... too lean isnt as dangerous as too rich, correct?
anyhow, what octane gas do you have to run? 93 should do it, but i wont know till i run the car...
i suppose that just running higher comp. pistons wont cause a need for too much extra fuel like running a turbo would
i got my waterpump, oilpump, sensors, and all that good stuff on friday, so monday i start the build! i had the shortblock assy. done for me, so all i have to do is the head job on up
thanks for the help!
04-26-2003, 09:50 PM
#7
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Yes, lean is very bad (i blew my motor before using nitrous, heads and cams...leaned out and a valve broke) this is why I rebuilt the whole engine.
I use 94 octane gas in my car, its tought to find but its nesessary to make it run right and safely. Good luck, ill post after I get tuned!
Dan
I use 94 octane gas in my car, its tought to find but its nesessary to make it run right and safely. Good luck, ill post after I get tuned!
Dan
04-27-2003, 07:17 PM
#8
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in other words
i cant even start this beast up then without doing some kind of fuel enrichment... thats what youre saying, right? so ill at least need a fuel pressure riser and an a/f gague to see wether or not im running too lean? if you guys can reccomend a good source for these things i would appreciate it too... im going to do my own research but advice is appreciated...
sorry for the scattered post, its sunday nite and im pretty beat
i finally got the shipment with the head alignment pins so i can do the heads and the rest of the build... if you guys have any advice on the head job other than what the haynes will tell me i would appreciate it... tricks, tips, etc...
sorry for the scattered post, its sunday nite and im pretty beat
i finally got the shipment with the head alignment pins so i can do the heads and the rest of the build... if you guys have any advice on the head job other than what the haynes will tell me i would appreciate it... tricks, tips, etc...
04-27-2003, 07:37 PM
#9
Registered User
iTrader: (12)
Join Date: Nov 2002
Location: Reno, NV
Posts: 18,369
Car Info: 1993/2000/2001 GF4 mostly red
Your stockers won't be too lean for low RPMs, so one option is to add the riser and guage, and drive it while you break it in, keeping the RPMs under, say, 4000. If you can datalog, you can extrapolate what the duty cycle is at that RPM and guess as to whether or not you need bigger injectors. Then, if you do need them, you might want to talk to RC Engineering about rebuilding your stocks, so you don't have to worry about fit. Or you could buy an STi manifold, which may or may not be well suited to an N/A car. Also, if you can give a close estimate of your engine's volumetric efficiency near redline, we might be able to tell you now. What we need to know:
Your injector flow rates
Max RPM before fuel cut
Current system fuel pressure at the rail
Approximate VE
Minimum TOG (time on gamma) for your injectors
Your injector flow rates
Max RPM before fuel cut
Current system fuel pressure at the rail
Approximate VE
Minimum TOG (time on gamma) for your injectors
04-29-2003, 04:55 PM
#10
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Ok,
The car is tuned to 8,000 RPM (wayyyy to much fun) and we had fuel issues in the begining. We were way to lean at about 7,000 rpm so we switched in the stock RS fuel pressure regulator...which diddnt help one bit, so we did install a Fuel Pessure Riser which fixed most of the problems as far as fuel goes, but tuning by the unichip is inadequate for the car, Im going stand alone next week. The car was leaning out at 8,000 rpm just at the end of the powerband, it needs more fuel there still.
But we diddnt need to swap injectors, if we encounter fuel issues at 8,000rpm with the nect tuning, we will put in WRX fuel injectors.
But with an upgraded fuel pump, and a fuel pressure riser the car did fine, but we will likly swap injectors with the new management, Ill let you know if we do.
Good Luck
Dan
The car is tuned to 8,000 RPM (wayyyy to much fun) and we had fuel issues in the begining. We were way to lean at about 7,000 rpm so we switched in the stock RS fuel pressure regulator...which diddnt help one bit, so we did install a Fuel Pessure Riser which fixed most of the problems as far as fuel goes, but tuning by the unichip is inadequate for the car, Im going stand alone next week. The car was leaning out at 8,000 rpm just at the end of the powerband, it needs more fuel there still.
But we diddnt need to swap injectors, if we encounter fuel issues at 8,000rpm with the nect tuning, we will put in WRX fuel injectors.
But with an upgraded fuel pump, and a fuel pressure riser the car did fine, but we will likly swap injectors with the new management, Ill let you know if we do.
Good Luck
Dan
04-29-2003, 05:14 PM
#11
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stand alone
which system are you going to? i would like to learn more about what my options are. i would love to be able to tune the car the way i want it, as opposed to just trying to fix the problems presented with the stock ecu.
dan, i would imagine that it was easy to find a stand alone system for your car because it uses the obd-II system?
dan, i would imagine that it was easy to find a stand alone system for your car because it uses the obd-II system?
04-30-2003, 07:57 AM
#12
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Join Date: Mar 2003
Location: Elkton, Virginia
Posts: 137
Car Info: 1998 Subaru Impreza L 2.2
injectors
1991 Legacy Turbo EJ22T injectors are rated at 390 cc/min. I have heard of people swapping EJ22 and EJ25 injectors, but haven't read anything on injectors from an EJ20T.
Just to throw some prices at you:
STi Injectors 565 CC - 02+ WRX
FREE SHIPPING ST-16611AA510 $385.00
Power Enterprise Injectors 650 CC - 02+ WRX
FREE SHIPPING PE-TH650F $625.00
Power Enterprise Injectors 800 CC - 02+ WRX
FREE SHIPPING PE-TH800F $625.00
Walbro 255 lph Fuel Pump - w/ 02+ WRX Setup Kit
FREE SHIPPING WAL-GSS341-K $100.00
Information from: http://www.gruppe-s.com/Subaru/subeng.htm
-Charles
Just to throw some prices at you:
STi Injectors 565 CC - 02+ WRX
FREE SHIPPING ST-16611AA510 $385.00
Power Enterprise Injectors 650 CC - 02+ WRX
FREE SHIPPING PE-TH650F $625.00
Power Enterprise Injectors 800 CC - 02+ WRX
FREE SHIPPING PE-TH800F $625.00
Walbro 255 lph Fuel Pump - w/ 02+ WRX Setup Kit
FREE SHIPPING WAL-GSS341-K $100.00
Information from: http://www.gruppe-s.com/Subaru/subeng.htm
-Charles
05-06-2003, 06:42 PM
#13
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Posts: n/a
heads done
well, i got my heads on last week, and now i am trying to find my tensioner bracket... where did i put that stupid thing?
anyway, i am going to order my fuel system stuff, prob. a larger volume fuel pump, fuel pressure riser (controls fuel pressure at the rail, right?) and whatever else i need as soon as i figure that out.
i placed a post in the engine management forum concerning my engine management/fuel system concerns, and hopefully will figure out what i need soon enough
thanks
anyway, i am going to order my fuel system stuff, prob. a larger volume fuel pump, fuel pressure riser (controls fuel pressure at the rail, right?) and whatever else i need as soon as i figure that out.
i placed a post in the engine management forum concerning my engine management/fuel system concerns, and hopefully will figure out what i need soon enough
thanks
05-06-2003, 06:46 PM
#14
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Join Date: Nov 2002
Location: Reno, NV
Posts: 18,369
Car Info: 1993/2000/2001 GF4 mostly red
I just reread your original post, and now I think that the Legacy turbo injectors might even be too small. That was only a 200 hp engine, so they probably weren't much larger than, say, EJ25 injectors. The WRX or STi injectors would probably be worth trying.
05-07-2003, 12:23 AM
#15
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turbo legacy injectors
yeah, i think the ej22t was only good for about 160 hp stock...
i *should* be a hair over 200 before exaust, good tuning, and nos... ( thinking about a 50-100 hp progressive nos kit, but thats waaaay down the line... too easy to cause myself problmes)
this all takes me back to hoping that stock wrx injectors will work, because they are easy to find here on the board...
btw, i was reading up on how the 2.2 went to a single exaust port in the 95-up vehicles... glad i have the dual ports... should flow nice ;-)
i *should* be a hair over 200 before exaust, good tuning, and nos... ( thinking about a 50-100 hp progressive nos kit, but thats waaaay down the line... too easy to cause myself problmes)
this all takes me back to hoping that stock wrx injectors will work, because they are easy to find here on the board...
btw, i was reading up on how the 2.2 went to a single exaust port in the 95-up vehicles... glad i have the dual ports... should flow nice ;-)
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