Hey all
I have a 07 AP2
I was talking to SOS about their AP1 return kit and they told me that the lines have been discontinued and they are working on a new kit with no ETA
https://www.scienceofspeed.com/s2000...0-2006-09.html

My questions are, are there any other alternatives and do I even need one?

I cant find the one on inlinepro's site either

I plan to aim for mid 450 whp using 92 octane, and maybe race gas (for the saucy tunes) via 6266, 1200cc FIC with a 450 walbro pump and wire harness by SOS. Id love to run E85, but i was planning on sticking with Hondata Flashpro. Might consider meth injection if that is a possibility too...
Unsure if my goals require a return line kit or not, Ive read on here that some have issues at 400whp , then there are some that do fine with 500 whp on stock returnless fuel system, although they are older threads.

Should I just get it tuned and see where the IDCs are at? If they are past say 85%, then worry about it?

Are there any other alternatives?

TIA

 

The SOS kit is comprehensive but imo very unnecessary. You can buy a new OEM 00-05 fuel basket, some fittings, hose, and just get yourself the aftermarket radium rail and DMR. The man to message for it is @Dizings2k ; he just did this himself, and lemme tell ya, the little fuel line holders on the bottom of the car holding the stock lines? They accommodate -8 & -6 braided PTFE hose like they were meant for it. You'll save yourself quite a bit of money in the process and have an overall sexier setup with a much higher future potential.

 

So here's the thing. Coming from the guy who's blown up several engines attempting to have a simple 06 DBW car SOS supercharged, survive a track day at a similar target power level to you... Just build your own return system.

Yes, technically your car will probably be fine returnless *on the dyno* and show all signs of being fine, but I'm now convinced that based on the fueling issues I had on track - that on the road, in motion, under high G loads, I dont think a returnless system can keep up. This is based on me leaning out several motors due to several build quality reasons, but this latest one was 100% fuel related on track.

I literally just built a return system myself, having never done it before, with a successful dyno a few weeks ago. My 10:1 2.2L with an SOS stage 2 kit put down 435whp at 15psi. The important part is how the car feels on the road, now with the full return system the midrange is so much healthier. I can hear it in the car that it's no longer strained making this kind of power. I know it sounds crazy, but I'm the guy thats had 5 engines into my S2000 now, I'm at least a little bit qualified on what not to do. Haha.

I think I had around a grand into the full return system. I basically bought an AP1 fuel hanger, a full kit of radium engineering stuff, including their AN lines, a couple fittings from summitracing and thats it. If you're interested I'll just send you the parts list of what I put into my DBW 06, along with pictures and such of things I learned along the way.

Idk what your mechanical ability is, but if you've built AN lines before and/or installed a FI system yourself, this will be a cake walk. IMO it's worth the peace of mind knowing you have ample headroom instead of pushing the absolute edge limit of the current fuel system with no room for error, bad gas, etc. Not worth skimping on something that can easily blow your engine.

Let me know if you're interested and I'll PM you or text you the stuff you need.

 

The OG's always have the knowledge on this fueling stuff. Mainly from decades of trial and error.

 

and a pile of receipts from throwing good money after bad! ha.

 

If you are willing to share the information on what you bought, I would also like that info. I am unfortunately in a similar situation.

 

If you are redoing or adding lines and you're ok with AN fittings Origin makes stainless fuel line replacements with -6/-8 bungs on the end. They slot into the factory fuel line carrier clips.

https://originfabrication.com/collec...it-honda-s2000

 

That's good to know. I am open to any help that anyone wants to throw my way. I'm sure the OP is the same.

 

That's sweet. I had no idea this was out there. Wonder if they could do a -10 feed?

 

Ok, I've received multiple requests for a parts list via PM so I'm going to post it here for the good of the future forum:

Radium parts:



More Radium. I thought I could use a 90 or 120deg -8AN fitting to connect to the radium fuel rail, but you can't. It hits the intake, so I had to order this, which works perfect:



Summit Racing (these pieces connect to the nipples on top of the AP1 fuel hanger and allow the connection of -6 and -8 AN lines to the fuel hanger):


Lastly, I ordered AP1 fuel hanger. The AP2 returnless does not have the two nipples on top for the feed to/return from the engine. This screenshot shows its discontinued but my local honda dealer was able to order one for me and get it the next day, they said they werent seeing any shortages or low stock in their system: