Robtune 550cc

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JimBos Legacy
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Robtune 550cc

Post by JimBos Legacy » Thu Jan 17, 2019 6:33 pm

If I were to run 550cc Top feed injectors, instead of running the adapters for the yellow top side feed injectors, would the 550 tune still work? I found some 550cc top feed injectors online awhile searching around


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Re: Robtune 550cc

Post by Legacy777 » Thu Jan 17, 2019 6:52 pm

I don't think the injector latency (dead) times are going to be the same between the side & top feeds. If you can find that information about both types of injectors you could clarify that.

Are you planning on using a different intake manifold? If not I think fitting the top feeds on there would take a lot of work.
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Re: Robtune 550cc

Post by JimBos Legacy » Thu Jan 17, 2019 7:05 pm

Legacy777 wrote:I don't think the injector latency (dead) times are going to be the same between the side & top feeds. If you can find that information about both types of injectors you could clarify that.

Are you planning on using a different intake manifold? If not I think fitting the top feeds on there would take a lot of work.
I read somewhere that too feeds would work on the stock fuel rails without the adapters. Maybe I read wrong. Phase 2 adapters seem to more commonly available then I thought. Probably would end up being easier to get the yellow tops and adapters.


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Re: Robtune 550cc

Post by Legacy777 » Thu Jan 17, 2019 7:11 pm

Top feeds will not work on the first gen Legacy fuel rails.

What adapters are you thinking of using?
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Re: Robtune 550cc

Post by JimBos Legacy » Thu Jan 17, 2019 8:49 pm

Legacy777 wrote:Top feeds will not work on the first gen Legacy fuel rails.

What adapters are you thinking of using?
One of the kits I found is by a company called Deatschwerks, haven’t looked around the fourms to see if any one else has used them.


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Re: Robtune 550cc

Post by Legacy777 » Thu Jan 17, 2019 9:20 pm

That kit is for the Newer Subaru manifolds. I don't know if they would be a direct fitment on our cars without some work.
Josh

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Re: Robtune 550cc

Post by JimBos Legacy » Thu Jan 17, 2019 9:25 pm

Legacy777 wrote:That kit is for the Newer Subaru manifolds. I don't know if they would be a direct fitment on our cars without some work.
I’ll take a look at the injectors and see if it looks like it’ll bolt up


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Re: Robtune 550cc

Post by carfreak85 » Fri Jan 18, 2019 4:11 pm

JimBos Legacy wrote:If I were to run 550cc Top feed injectors, instead of running the adapters for the yellow top side feed injectors, would the 550 tune still work? I found some 550cc top feed injectors online awhile searching around.
The tune was developed with a specific set of hardware in mind. Deviating from that exact list of parts is a gamble I would not be interested in taking.
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JimBos Legacy
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Re: Robtune 550cc

Post by JimBos Legacy » Fri Jan 18, 2019 4:27 pm

carfreak85 wrote:
JimBos Legacy wrote:If I were to run 550cc Top feed injectors, instead of running the adapters for the yellow top side feed injectors, would the 550 tune still work? I found some 550cc top feed injectors online awhile searching around.
The tune was developed with a specific set of hardware in mind. Deviating from that exact list of parts is a gamble I would not be interested in taking.
That’s why I’m thinking I’m going to go with Robs adapters that he sells, he mentions that deatschwerks work aswell, but are a bit more pricy.


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Re: Robtune 550cc

Post by mike-tracy » Fri Jan 18, 2019 5:42 pm

What intake manifold do you currently have, Jimbo?
1992 Legacy SS 5mt, build in progress
Josh Colombo wrote:
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Wait....I'm confused now.

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Re: Robtune 550cc

Post by JimBos Legacy » Fri Jan 18, 2019 5:45 pm

mike-tracy wrote:What intake manifold do you currently have, Jimbo?
I don’t have the exact part number, but it’s the stock manifold on a V1 Ej20G


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Re: Robtune 550cc

Post by mike-tracy » Fri Jan 18, 2019 7:33 pm

Ahh. all you need to do to use phase 2 sidefeeds is ej25d (all years, 96-99) rails. I know you were talking about retrofitting top feeds, but Rob's conversion kit does the same thing as using ej25d rails on an ej20g manifold.
1992 Legacy SS 5mt, build in progress
Josh Colombo wrote:
Mon Jan 14, 2002 10:23 am
Wait....I'm confused now.

JimBos Legacy
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Re: Robtune 550cc

Post by JimBos Legacy » Fri Jan 18, 2019 7:48 pm

mike-tracy wrote:Ahh. all you need to do to use phase 2 sidefeeds is ej25d (all years, 96-99) rails. I know you were talking about retrofitting top feeds, but Rob's conversion kit does the same thing as using ej25d rails on an ej20g manifold.
Gotcha, so it’d probably just be easiest to run robs adapters. I can’t seem to find the ej25d rails anywhere, but maybe I can find them at a junk yard somewhere around here


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