gkstar

16 minutes ago, Tehnation said:

So the fuel rail main bolts don't even line up, or they can't cause of those tabs? 

I just checked mine, I had to cut off the front tab to get the passenger fuel rail to fit. 

Correct, the stock Wrx/sti top feed fuel rail bolt holes do not line up with side feed TGV  bolt holes. 

Photos to support evidence of figment mismatches. I have not tried the 07+LGT plastic manifold and probably at this point a little to far it to make the exploratory purchase. Unless someone has one super cheap
 

02-05 Top feed TGV two firmest issues with stock lines pic 1&2

1. as mentioned plastic manifold does not match up on inner. Approx 4mm off center. Two items to adjust fill and retap, remove brass inserts and potentially add brace on top of plastic then tighten

2. Tabs on intake hit lines. Possibly dremel tabs off

on side feed from metal manifold. Purchased just the reducer pieces from Radium and bolt kit from IAG. Stock top feed fuel line attachment holes are narrower then side feed. Attempt was to “make” a conversion kit without doing new lines too. Could notch one of the brackets and add washers on bolt top and bottom to sandwich the piece but that is a little shady.

On 2/5/2023 at 1:45 PM, Tehnation said:

Years ago 05-06 people like me who wanted to go top feed but didn't want to spend 1000 bucks or so on a fuel rail kit figured why bother when you can go to the junk yard grab some top feed fuel rails for like 50 bucks, then buy a topfeed tgv delete kit for like 200-400 bucks wtih enough change to get a phenolic spacers. The tgv delete wasn't really the main purpose it was more a byproduct, like if i'm going topfeed why not just buy aftermarket deletes its basically free horsepower at that point(compared to buying a 1000 dollar kit), not much if any but like I said it's free so why not.  So for less than 500 bucks basically you could go topfeed and get the tgv deletes and spacers, saving you 500 bucks towards better injectors. It was just purely more efficient economically to go that route. Now fast forward and it may come back to bite us in the ass lol. Back then the tgv was out of site and out of mind so the electronics never came into the picture, cause you just turn it off! 

For those with experience in the sidefeed to topfeed conversion kits. Do the new rails provide any more support than a stock top feed rail would? Could you just use these from radium with stock top feed lines http://www.radiumauto.com/Injector-Seats-for-Subaru-Top-Feed-Conversion-Fuel-Rails-P628.aspx

1 hour ago, Underdog said:

One of the potential workarounds is a module that emulates proper tgv operation, rather than making the 07+ style functional, so Mike may be referencing that. However it’s likely that any device that touches emissions equipment at all would be a potential liability for the developer, so I stand by my comment about not offering a retail product. That does not preclude a workable and accessible solution, just means we need to be deliberate about what that looks like. 

the APS adapters(or similar) would have been first choice and most elegant, but alas I fumbled through an attempt to make the older top feed tgv's work with our manifold. Ordered a real set of 02 wrx ones to look at how much off the bolt holes are that @m sprankfor my curiosity. Will keep the thread updated once they arrive

2 hours ago, Tehnation said:

You are right those are sidefeed! 

Isn't it easier to just use a tgv from a 02-05 wrx? Apparently those are plug and play I thought. 

I gotta track down a set from a junkyard, but its gonna be a pita cause carpart can't search for tgvs so I gotta do it locally which means..... it will take a while. 

I still have my old sidefeed tgvs, I wonder if the electronics would fit in the top feed tgvs? 

Search intake manifold. They are sometimes listed as intake manifold lower. 

2 hours ago, m sprank said:

Did not read everything recently posted.  But the pix are sidefeed TGV's.  Also, it is well known that you can use a TGV from a plastic manifold with a metal manifold (you oblong the TGV mount holes to line up with the metal manifold studs).  But it does not work the other way around. 

 

EcuTek is the easy answer. 

So I will hold the L on TGV’s. Should have been more careful with purchase.

But why will the tgv from a metal manifold not work on a plastic manifold. After market tgv’s do not make that distinction. 

41 minutes ago, gkstar said:

I will take more photos. The stud aligns with one of the attachment points on the intake manifold. 

So the 92-X had the EJ20 like any WRX from 03-06 but were topfeed. Where the STI in 04-06 are sidefeed like the LGT. Here are some more photos including intake manifold set on one TGV. If there are more angle requests lmk I can take them later 

Just now, Tehnation said:

I think that might be when the sti came out with the 2.5 liter thats why things get squirrely. 

I will take more photos. The stud aligns with one of the attachment points on the intake manifold. 

3 minutes ago, Tehnation said:

wait a minute..... where did this saab tgv idea come from? Are you saying the topfeed tgv from a saab 92-x is plug and play with a side feed subaru harness???? 

Well the 02-05 WRX was on the list of ones that fit and the 92-X Saabaru is y a facelifted 05 WRX so I expanded the search. The WRX ones where hard to find 

Below is a pic of the TGV and the sensors

Started down this path recently. Thank you to everyone on their research.

Found topfeed TGV from a Saabaru 92-X which is the correct 3&2 pin config, picked up an extra intake manifold and gaskets. Everything appears to line up from TGV and up. What am I missing on connection to heads as the gaskets and phenolic spacers seem to be universal? 

Costs to date

TGVs $75 

top feed fuel lines $100

spacers and gaskets from grimmspeed $108

extra manifold to test which I wish I would have grabbed from @Underdog $120

I have modded 575cc top feed injectors I need to check with a tuner if I can plug and play to get going or will look into 1050s or pick up stock 07+ top feeds