Our setup in the drivers side of the tank not only sends typical surgecan overflow back to the stock pump, but also pulls fuel in from underneath the can on the drivers side, to increase overflow volume and assist the stock fuel pump in recovering fuel to the passenger side more quickly.

the limits are TBD... its very possible that the stock pump will rarely starve at all with this configuration. Its just that testing something like this is so dynamic that it is almost impossible to bench test every scenario. Ultimately, they just need some miles on them to determine where they stand. Only time is really going to show how long the stock pump survives when racing at low tank levels, based on how well our product is helping it recover fuel. Hell I say the product needs more testing just to make sure it reliably gets cars down the street without hiccups! But I think its going to be a success.

How did the track test go on Sunday? Was it derailed by toe in/out issues?

Well the FS surge tank got tested today. Down to one dot with the warning light on and 35 miles to go. Medium grade right hander that is 2/10th a mile long no hiccup at all. Awesome.

So this could reasonably allow you to cut up to 100 lbs of fuel.

Terrific news!... couldn't be more happy to see this product working - do you see me eating words, Phunk? chomp chomp... lol

congrats

phunk, do you have a link that has the full product description?

They deftly maneuver and muscle for rank. Fuel burning fast on an empty tank..

Had to cross-post some deft manuevering and muscling for rank. Consider it hold music for the thread :)

full track test commences in 2.5 hours. Hoping for 4 30 minute sessions before first fill up.

65 minutes of track time so far, no issues!

It works! I did a 15, 20, 30 and 20 minute session before I got any stumbling at all. Then it was on straight line acceleration. Filled up car at that point and it took 19 gallons. I got 118 out of that tank. For safety I think I'll fill up at the 100 mile mark in the future to keep the pumps wet.

awesome!

19 gallons fillup.. means you were like running on fumes LOL. the car is supposedly rated at 18 gallons i believe...

great news

Very nice!

Can you feel the weight loss difference at all across the day?

Also... Just because I'm curious.. How many gallons would it take to fill it up when you would stop due to starvation previously?

me likes :tup:

Mine is about three Dots from full. How soon till others can get theres? I cannot even make it a 20 min session before fuel starve.

bumping this

So far, everything I have is in this thread. I will have it up on the website sometime this week I believe, as I am working on a lot of cleanup and organization there. I have intentionally left out detailed descriptions but I can give you guys a little more information.

They are technically available for shipment. There is a minor annoyance I still have to fix, and the instructions are are still crap.

Now that I have some really solid results to work with, its easier for me to feel driven to tie up the loose ends and call this project complete.

Super thanks for all your hard work Charles. Been a long road and defiantly mod of the year or the hole generation of the Z34.

Thanks for the kind words.... But I owed it to you! You and Mike did me a favor by electing to be the first paying customers to try out this product and risk kinks, so I thank you guys as well! It's looks like this is unfolding to be what you guys needed and what I wanted to build.

Now I am anxious to see how it performs in some of the other configurations it was built to support.

Not sure if I could feel the lower weight as it got emptier or not, I did get faster as the day progressed, but thats normal when I haven't been on track in a while.

It used to vary where fuel starvation happened, as low as one dot from full exiting the carousel at Road America at worst, but for the most part, I would put in between 4 and 5 gallons after every session.

Thanks again for an awesome product!

I just looked at the owners manual. Its a 19 gallon tank, but yeah, it was pretty empty! I actually thought it was 21.

There was one day that I literally coasted up to the E85 pump, engine dead, out of gas. I barely had to use the brakes to stop the car and I wouldnt have been able to make it another 20 feet to a gas pump without pushing it. The car took just over 19 gallons to fill it.... so we know for sure that the product is working, well, flawlessly, to let Mike get down to an essentially empty gas tank. I cant say that its working beyond my expectations, but I try to not get too confident in unproven things until judgement day. Ive spent a lot of years specializing in fuel system design and was able to apply a lot of ideas to this product.

To run this setup with a single walbro 255 in an all motor road racing car is still the easiest test for this product. The real tests for it have yet to come... A twin turbo or supercharged car, coupled with the fuel demands of E85 running over 500rwhp on the road course is going to tax the system to its maximum potential, even beyond a 1000hp drag car going straight. To make it even harder, we could run a single Aeromotive 340lph pump in there, rather than the special Walbro 255 that is in it right now (which has a built in siphon to supply additional fuel to the can from the drivers side and increase overflow volume to aid the stock pump). If it can perform as well in that environment as it did for Mike today... I will have to just give myself a pat on the back!!

I am at the shop today and did some examination into the issue that Mike and Spohn have run into so far. They have had a problem where when they fill the tank, the level float is getting snagged on something and stops a couple dots from full tank, and then begins to read properly once the fuel level lowers and catches up to the float.

I double checked the new location of the level float to verify that the spot we put it in allows it full swing. There is a baffle in the tank that has to be bent out of the way for this new location. I verified today that with the baffle bent out of the way, the level sensor float has full travel as its intended, and is at the proper height.

So where we went wrong on this... is that I failed to adequately describe the modification required to the baffle in order to allow full swing of the float arm with out product. Unfortunately to resolve the situation will require them to go back into the gas tank again to make an adjustment.

I have attached a few photos to illustrate. The 2 photos showing the stock mounting (white hanger) with the level float at the max up position (notice the swing arm hitting the stop).

Also then 2 photos showing it with the new setup (disregard the beat up nature of the product, its a mock up and machine program test unit.. this crummy one will go in my own car). Notice that without the bending of the baffle that the float would hit it.

Yep, the picture in the initial instructions looked like only the lower corner of the baffle should have been bent.

Thats what guinea pigs are for though, so we can figure out where instructions are lacking or product can be improved so when its finally released, noone else has any issues.

This kit is extremely high quality and almost a work of art. Its a shame its concealed in the gas tank.

As for me and the fuel level float hitting, its not a big deal because its just at the top of the range and because racecar. The lower range works fine, and thats all that really matters, so I'll leave mine as is.

Well said Mike.

It is a work of art.

Charles,

I'll get up with you when I get back from Z-Nats. I have spent WAY to much money last month on car parts. LOL
I was hopping to do this install while I had all the interior out, but I just reinstalled it for Z-Nats.

Chad

Sorry we didn't quite make it in time... Because you will really want to pull the seats out for this! We will catch up soon, have a good time there!

phunk, shoot me an e-mail when you want your money. :D

My name was in the first batch but I had to get out of it (blown engine) but by Jan/Feb 2013 Im gonna get this part !! :)

I can really see now why you want the tank on empty when do the install. It's a bit tight in there. Thanks for the Pics.

Still in for it. When do we start?

Sorry guys I've been busy moving inventory and what not (things are changing with our business, trying to increase efficiency and quicker workflow). I'm nearly done with that stuff.. I'll get some more kits ready to ship out this week for those of you anxious to go!

Just getting back to this issue and have gone through 19 pages of posts and am still not sure of the exact solution here - my question is Phunk, are we now talking a surge tank solution or is this still an internal tank solution?

It's an in-tank surge can that works in combination with the existing system.

^^^ exactly... its a surgetank style solution that works in harmony with the factory fuel system (or can be configured to work with return systems or pretty much anything you do). It is all concealed inside the tank and there is not an inch of modified plumbing outside of the tank... the only thing you have to do outside the tank is install a relay kit and run it to the drivers side of the fuel tank.

Doing it the way we have, and intercepting the fuel lines inside the tank, has allowed us to do a surge can setup without all the typical problems and complications with external surge cans on the 370z/350z/etc. There was never a proper way of doing it, regardless of it having been done, and we are addressing all the issues with it by installing it in a unique way.