So if we have a regulator open to atmosphere should we put it on a boost reference?

I know thats what you suggested, and I was going to swap it back (switched it to this when I was having all sorts of pressure issues) and there have been no ill effects at steady state the pressure stays even +- 1-2psi. If I start to have issues I will put it back. I never looked at my trims yet but when im do that will give me a better idea on what the system is doing.

You dont need to hook up the boost ref, and if you do you will need a retune because you will start to run very rich in boost if the car was tuned without it.

It wouldnt matter unless you run out of fuel... My 370z still has never had a line to the regulator, just 52psi pressure full time, even at 12 psi

The VVEL system will run the engine at as little as zero vacuum during steady state cruising. You fuel pressure will swing around about 10psi up and down if you are watching it at the right time. Whether it bothers you or not just depends on your expectations of the tune and its consistency. With a VVEL engine, manifold vacuum is not a consistent or linear measurement of engine load. With that relationship broken, the only way you can gain true repeat-ability of the fuel pressure is to take the vacuum out of the equation. It wont hurt the engine or even matter during full throttle... it would basically just be like a little gremlin sitting in your engine bay turning your fuel pressure up and down when cruising down the road.

Are you guys willing to sell the kit without the turbo/wg/bov? We have our own preference on turbo options and prefer Turbosmart to Tial items.

I still keep reading this hope there would be a solution for the auto guys. Great stuff tho.

There is, buy a manual...:stirthepot:

Phunk - so why do some Z's require a fuel return system and some do not?:confused:

Some guys just need more fuel than others! It all depends on individual goals and needs. There is no clear crossover point where it becomes absolutely necessary, but it does eventually become necessary for most. Those making high power without one would generally find themselves in better shape to have it. Someone could say that they have 600rwhp with no return system, but that doesnt mean it shouldnt have one... fuel pressure is going to drop towards redline when you are looking at that type of flow through stock plumbing especially when the pressure is regulated before rather than after incoming flow restrictions. Most tuners will find fuel pressure drop to be unacceptable because any system that is performing beyond its limits is going to lack consistency and without consistency in your fuel system you cannot really consider the setup to be truly dependable.

All aside from that, nobody ever really considers how efficiently their individual car is consuming and burning the fuel that its supplied. If two E85 370zs are running identical builds but one is tuned to 17 degrees timing and the other is tuned to 23 degrees timing, you are looking at 2 cars producing a variance of 75-100hp out of the same exact fuel volume. Timing is only one of countless values that can effect the engines ability to efficiently turn fuel into horsepower. Odds for or against you can reach the end of a fuel system a couple hundred HP apart. Some guys think a Walbro 255 can only support 400rwhp but I have seen them make 670rwhp! Its all over the place.

Going to try to get this done before our winter hits here - Thx Phunk, Jwick, Mitco for all the help.

The Ecutek tune from Seb/Greg partnered with Sasha Boosted Performance kit really bring my Z to the next level of enjoyment. If I had the dyno numbers to be part of the 500 club that would be the icing on the cake - but I am enjoying my Z just as it is...

Greg @ SpecialityZ - thanks for the clutch pedal adjustment too! :tiphat:

Sorry this is not an option. With different components (turbo/wastegates) there in no guarantee that things will fit.


Charles, thank you very much for sharing your expertise with the community when it comes to fuel systems, and how they perform...I am sure everybody appreciates it, I for sure do.


You also hit the nail on the head with regards to tuning and how power output and timing are so intricately connected. I have customer making 520whp and 480ft/tq, while some others are managing "only" 480hp and about 400ft/tq....all on the same OEM fuel system. Based on torque alone, it is easy to see that the higher torque output car has much higher timing....allowing for much higher power output with the same amount of fuel. I am seeing such a huge range with fuel injector duty cycles as well, which again is closely tied to how the car is tuned.

That doesn't concern me as we can make anything fit. Already replaced a Garrett on a Nismo Z with either your kit (or one that looks and/or mounts everything exactly the same way) with an oilless turbo because the oil scavenging pump sucked and the turbo was blowing oil through the compressor housing.... lol.

I like the ease of install of your kit, I'm not interested in the scavenging pump or turbo (prefer to run an oil less).

If you're interested in selling just the hard parts so we can fit our own turbo/gates/bov, lmk.

Tell then to make a manual AWD sedan :stirthepot:

:)

what would be an ideal turbo-back exhaust set up for your 600whp+ customers, to maximize flow & therefore power. can you still retain the dual exhaust set up for these cars or would a single be better?