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Old 08-18-2012, 03:49 AM   #1
eg33GC
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Default 5th injector- ra specific?

I've been trying to find my quick question, but haven't yet.
Did anything but a forged piston, non poopy hla, wrx or sti RA come with a 5th injector?
I'm looking at a closed deck, non dccd, 2c ecu equipped setup.

Thanks
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Old 08-18-2012, 05:10 AM   #2
Marnix
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I believe 5th injector only came on the non-HLA, forged piston, closed deck, RA engines 1994-1996.
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Old 08-19-2012, 05:07 PM   #3
Millhouse_5
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I've also heard that the 5th injector on the RA wasn't even functional. It was just put there because the stock model had to have the same features as the race going version so it just kind of showed up on the street models.

this has been discussed on typeRA.co.uk
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Old 08-20-2012, 03:01 AM   #4
i_c_the_light
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Quote:
Originally Posted by Millhouse_5
I've also heard that the 5th injector on the RA wasn't even functional. It was just put there because the stock model had to have the same features as the race going version so it just kind of showed up on the street models.

this has been discussed on typeRA.co.uk
Homologation requirements for GrpA my friend.
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Old 08-20-2012, 02:44 PM   #5
elislider
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for sure my roommate had a v2 STi swap w/5th injector. it was non-dccd, however at this point theres no telling whether that transmission was the original one for the engine. also we dont have the vin tag from that engine to compare
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Old 09-13-2012, 01:42 AM   #6
eg33GC
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well here we ****ing go again,

5th injector and closed deck does not guarantee shim under valvetrain.
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Old 09-15-2012, 07:11 PM   #7
ra gc8
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If you have a fifth injector, then you have the closed deck with forged internals. When computer is notified of WOT the fifth injector is then grounded and engaged to 100% duty of 100cc/per min.This very mild misting of fuel simply pre saturates the air traveling through the intake.This can be tested by using your ohmmeter on the wires at the injector,and hitting WOT,I cant remember what ohms it will read.
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Old 09-16-2012, 11:05 AM   #8
Marnix
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Interesting. I have a 94-96 RA ECU and matching intake manifold. I guess I'll have to find out when I'm done with the turbo conversion on my Legacy.
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Old 09-16-2012, 07:55 PM   #9
TommyAtomic
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Quote:
Originally Posted by ra gc8
If you have a fifth injector, then you have the closed deck with forged internals. When computer is notified of WOT the fifth injector is then grounded and engaged to 100% duty of 100cc/per min.This very mild misting of fuel simply pre saturates the air traveling through the intake.This can be tested by using your ohmmeter on the wires at the injector,and hitting WOT,I cant remember what ohms it will read.
Interesting x2.

I've never heard of anyone who actually had a working 5th injector even under WOT. Ive always heard that the 5th injector required seperate engine management.

Anyone know if Rob has ever gotten the 5th injector to work in any of his tunes?
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Old 09-16-2012, 07:58 PM   #10
RealDealTarheel
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Quote:
Originally Posted by eg33GC View Post
well here we ****ing go again,

5th injector and closed deck does not guarantee shim under valvetrain.
Any way to tell other than pulling a valve cover and looking?
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Old 09-16-2012, 11:35 PM   #11
rob
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Quote:
Originally Posted by ra gc8 View Post
If you have a fifth injector, then you have the closed deck with forged internals. When computer is notified of WOT the fifth injector is then grounded and engaged to 100% duty of 100cc/per min.This very mild misting of fuel simply pre saturates the air traveling through the intake.This can be tested by using your ohmmeter on the wires at the injector,and hitting WOT,I cant remember what ohms it will read.
Where are you getting your information from? I do not have an RA motor myself, so I have only gone off of hearsay. However, I have seen more than one report from RA owners that their testing found that the 5th injector never turns on with a stock ECU. It is only with the Grp-N ECUs that the 5th injector is activated.

If you think about it, it doesn't really make any sense that you would have a dumb fuel adder simply with WOT. The stock fuel maps are overly rich to begin with.

Tommy - No I have not tried to activate the 5th injector in my tuens. With the easy option of larger injectors, I would need to be convinced there is a good reason to spend time on it (and no, because it would be cool is not a good reason ).

-Rob
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Old 09-17-2012, 09:19 AM   #12
Millhouse_5
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So the 5th injector is hooked up and useable, but just not ever used? So I'm asuming there would be no reason to ever bother changing it when upgrading injectors.

where is this other injector anyway? All i know is that I'm supposed to have one
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Old 09-17-2012, 10:57 AM   #13
elislider
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Quote:
Originally Posted by eg33GC View Post
well here we ****ing go again,

5th injector and closed deck does not guarantee shim under valvetrain.
none of the v1-2 engines were shim under bucket... that wasnt until v3-4 and none of those had 5th injectors.
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Old 09-18-2012, 04:03 AM   #14
Marnix
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The 94-96 RA engines have shim under bucket, I have built two engines with those heads and rebuilt another set. Damn hard to get shims for those by the way.
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Old 09-19-2012, 07:39 AM   #15
renhoek
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I too am just finishing a V2 Engine with shim under bucket. Manifold is a 5th injector unit.

While we're talking about this, does anyone know what the lifter clearance is for exhaust and inlets?
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Old 09-19-2012, 01:20 PM   #16
Marnix
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0.20/0.25 mm
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Old 09-20-2012, 07:01 AM   #17
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Thanks bud. I assume the larger gap is for the exhaust....
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Old 09-20-2012, 08:17 AM   #18
Marnix
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Obviously
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