3rd Gen Tacoma 3.5L Forced Induction Port Fuel Rail Group Buy

So there's no port for a damper?

 

These rails have 8ORB threads on each end. You just need an 8ORB damper like this.


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You can also run one inline before the Y split.



So many options. This is why plumbing is not provided. The dual 8ORB ends provide maximum flexibility for everyone's needs.

And should that fail, you could just drill and tap whatever port you need right into the rail. Making the body octagonal versus round was both to make the cnc cuts easier and to allow for drilling additional fittings.

 

I didn't realize radium makes in-line dampers, I thought dampers should be installed immediately after fuel inlet on the rail.

 

Dampers are a funny thing. They should be placed as close to the rail as possible, but can actually be just about anywhere in the line, to include the return. Fluctuations are caused not only by the pump but also the opening and closing of the injectors. You want it near the rails because you want the smoothed out fuel to be closest to the injectors. It's just a diaphragm on a spring that absorbs fluctuating fuel waves. You could even put an inline between the end of the two rails with a crossover.

Radium actually states that you can put a damper on only one of the two rails and have the desired result. Some applications may need one on each rail. For our case, we have to have the pressure sensor on the end of the passenger rail, so the inline FPD might be the preferred route, or you may be able to put an FPD on the end of the other rail and it works fine. We won't know until it's tested.

The reason that OEMs use fuel dampers is two-fold, fuel performance (when there is a problem), and...Noise. Let's be honest, most OEMs do things for comfort and regulatory compliance. Toyota definitely didn't put 4 catalytic converters on a Tacoma for performance. FPDs are necessary when they are necessary. That doesn't mean you HAVE to have one. Like Jowett said, Toyota doesn't have one on the newer tacoma because they designed the rail to absorb the fluctuations (it's the weird horizontal pockets)

If we need an FPD for this new rail, well it's completely speculation at this point. We may find that the thickness and design of the rail negate it (probably not). We may find these rails are noisier because I designed it to omit the plastic spacers that in retrospect are probably used to dampen the noise from metal on metal contact. There is no way to know until we mount it up. Plenty of aftermarket fuel systems do not have these FPDs and perform just fine.

When I get the first production piece I will look into it. I will be honest about anything I find to ensure you guys have the most information. In the end though an FPD is probably going to be a personal preference. With the large bore of these rails, it's unlikely the fuel pulsations will have a detrimental effect on fuel flow. If there is any noticeable noise increase or issues with tuning, the testers and I will let everyone know.

 

It might be easier to try and picture what is happening and why an FPD works. Think of it like a push/pull of fluid. Every pump cycle or injector opening causes fuel to move. When that fuel moves it abruptly stops and starts over and over again. When it hits the end of the rails, the closed injector valve, or whatever, it causes a reflection of energy. Like waves crashing into a pier. This also increases fuel pressure momentarily.

The FPD just allows those waves to push and pull a diaphragm on a spring so there is no crash. So the fuel is sort of expanding and contracting into a balloon instead of hitting a wall and causing an increase in pressure. That's it. Ever heard any kind of liquid pump make a pinging noise? That was the sound of those fluid fluctuations against metal.

So in reality, you can have your FPD anywhere. You could probably put it right beside the pump if you wanted.

 

1 set for me. Thank you for working on this!

 

I’m in for a set. Nice work

 

Stupid question: Are there any concerns with the gasoline degrading the polymer these rails are made out of, over time?

 

Production units will be 6061-T6 aluminum. The yellow plastic piece is a prototype used for fit up.

 

Thanks for the clarification. See I knew that was a stupid question. LOL

 

Ok, so here is the update on how the order is going.

Trying to get any of the rails early will cost a lot more money since they would do it in two orders and charge the setup fee twice. I was kind of hoping to just pull them off the line as soon as they are cut, but that doesn't seem to be the case. I could get a few somewhat earlier by asking that they don't anodize those few. It would make those ones cheaper of course, but they would be raw machined aluminum.

The cost margin between 50 and 70 rails is huge. So I will be doing these in sets of 70 rails.

As of right now there are not even 20 interested, which is a bit disappointing, but here is what I will do. I'm going to put in an order tomorrow for 35 sets (70 rails). It'll take 35 business days for full finishing. For anyone who is on the list in post #1 and anyone else who jumps on the list prior to completion of the rails (up to 35 sets), I will sell these for $160 shipped to anywhere in the US.

This cost will cover:
- 2 Rails, anodized
- 4 New Mounting Bolts
- Shipping to anywhere in the US (including Hawaii and Alaska)
- Misc costs: boxes, packing materials, etc.

Anyone after 35 sets or completion of the first set of rails will have to pay $190 shipped. Again, this is less than the price of most aftermarket rails of comparative quality. Once the first 35 sets sell, if there is still interest, I will put in put in more orders until I'm just generally tired of doing it, in which I'll hand the design off to someone else. I'll try to keep some on hand in the event someone needs a set in the future.

 

The order has been placed. The 3 tuner sets should arrive in about 28 business days. Fully finished sets in 35 business days. I'll keep you guys updated of any changes or whatever, but at this point we are just waiting. Once I get the Tuner sets I will do a full install and test everything, to include do a test fit of what adapters and lines are required.

I'll monitor this thread for any additional interest.

 

Ready and waiting....

 

Haha, it's still going to be a while. Like 6 more weeks.

 

No worries, just keeping it up top to drum up more interest.

 

Thanks for this I am interested pending some initial results and final cost estimates.

Has anyone done additional work to insure even distribution in the intake manifold? I think someone @Jowett possibly posted some photos that looked like it could be better.

 

You are talking airflow in the lower plenum. I have not done more with that, but it's on the short list.

 

Please put me in for a set. Going Supercharged in a few months.

 

James, you can add me in on the list! Thanks! I've been having some questions about my magnuson lately. I stomp on the gas pedal and it boosts up to 7-8 psi and then it goes dead pedal on me like something is preventing it from going further. It only happens when I mash on the gas pedal. Regardless, I'm in for consistent performance!

 

Just wanted to give an update. We are still waiting obviously. The test pieces are projected to be complete around the first week of july, so only 2-3 weeks.

Then the finished run will be done around mid-late July.