On this new iteration, yes. But we're still working on exact placement of the ridge. Nozzle might have to go in sideways if that's where you want to run it.

No plan for a boss as that's not where we suggest nozzle placement - but that can always change. However, the material is thick enough for a nozzle even without the boss.

 

What's with the SakeBOMBER cap? Did I miss some kind of announcement?

 

Sit tight.

 

That's an optimum placement for a nozzle. It's lower then any of the side locations and it's just on top of an existing opening in the body.

 

"Optimum" is very relative. That hole in the floorboard isn't exactly large, and depending on the size and orientation of the nozzle, it might be difficult for some setups. Not to mention where you are mounting the pump / how you are routing the lines comes into play.

This is our recommended nozzle placement:


No, it won't get every last drop - but any tank (fuel, methanol, OMP) isn't really design to be run bone dry anyhow. What this position does is allow for completely safe nozzle placement and convenient access for a number of setups.

As I mentioned before, you can drill anywhere you want. There is nothing limiting you or anyone from adapting this tank to your exact requirements. However, when designing ANY product, we have to design for the 99% of users that want something as close to "bolt on" as possible.

We're adding this ridge / sump as an effort to accommodate concerns about slosh that may occur in the 1%. We have CFD tests being run to figure out real data on slosh, potential starvation at various loads (Gs) and capacity (% full/empty). We'll share those findings as we get them.

 

116. gravytraindg -1 maybe 2 depending on price

 

1. Spalato - 2 tanks
2. ZoomZoom - I'm in for at least 1. Maybe 2.
3. Slideways FD - 1
4. Silvertrd - 1 tank
5. jza80 - 1 tank
6. the spyder-
7. Izanami - 1 tank
8. SpeedCrazie - 1 Tank
9. photoresistor - 1 Tank
10. jsemerica - 1 Tank, maybe 2
11. Myocardial Infarction - 1 Tank
12. Rocketeerbandit - 1
13. Brekyrself - 2
14. 20005.3 - 1
15. Knotsonice - 1
16. Kensin - 1
17.Gio612
18.7krayziboi
19.#slevin
20. Fourtyounce - 2 maybe 3. Matt Gold for PreZident!
21. One for me please, Charlie
22. Redgti (James, uk) -1
23. Khan Racing - 1
24. Sigma
25. Alex Newman - 1 (UK)
26. thatdon
27. MattUK (UK - Can post to a mate state side if required)
28. Ptrhahn. 1
29. Iantboyd - 1
30. Fendamonky - 1
31. Sc0rp7 - 1
32. ColdFeet - 1
33. jkstill
34. Montego -1
35. Zepticon - 1 tank
36. Matthew Ng - 1
37. p51hellfire - 1
38. thanson90
39. s8nana - 1 (AU)
40. Runrex -
41. Garethb -1 (New Zealand)
42. Dhanson31
43. Ondabirdhouse - 1 (possibly 2)
44. Tictakman - 1
45. BaconHunter - 1
46. Trout2 - 1
47. spirit rx-7 - 1
48. Saham -1
49. Cvzg77r-1
50. pingu81 - 1
51. moshaka - 2 tanks maybe 3
52. Ryans93rx7 - 1
53. Rarotary - 1
54. TWIZTIDRX -1
55. XPT700 - 1 tank and shipping to Scotland
56. Sukisuki - 1
57. Daleclark - 1
58. Smokey The Talon - 1
59. Ghoujoumian - 1
60. Talkwrench (UK) - 1
61. red_dragon - 1
62. Street-heat7 - 1 maybe 2
63. Jonnybravo408- 1
64. THE TECH
65. KompressorLOgic - 1
66. TurbosaurusRX
67. Nashman69g - 1
68. Selonari - 1
69. Neutron - 1
70. Stivat - 1
71. Sgtblue -1
72. mcon (Ireland) - 1
73. BlackPEP - 1
74. RoboticsRacer
75. Hai-tek7 - 1
76. Monkman33
77. DnlCappy
78. Orbitalmovment
79. Helloninja - 1
80. Sideo - 1
81. yehreally - 2
82. $lacker - 1
83. Macer - 1
84. SimonFD3S - 1 (FRANCE)
85. j_man1100 - 1
86. ncx94 - 1 (France, and could dispatch here if you want to make only one shippment)
87. wazway 1
88. 1987 T2
89. REAmFC3S 1
90. M104-AMG (1)
91. Kissama (France)
92. TomU
93. Boriboost 1
94. MaczPayne 1
95. NetSeven 1
96. B-TAG - 1
97. RCCAZ 1, possibly 2
98. rotaryfdtt - 1
99. BeREv - 1 (France - Rotorhead on RX-7 France forum)
100. touki - 2
101. - dhahlen 1, possibly 2
102. cloud9 - 1
103. Moe Greene - 1
104. seipherzero - 1
105. m4drx - 1
106. Rawbz08 - 1
107. David Hayes - 1
108. Harry SB - 1 tank.​​​​ California.
109. Net Seven - 1
110. primerGrey - 1, possibly 2
111. MDP - 1
112. elfking - 1 tank. California.
113. technomentor - 1, possibly 2
114. neit_jnf - 1
115. Deathmaker07 - Canada- 2 tanks
116. gravytraindg -1 maybe 2 depending on price
117. hyperrex - 1 tank, possibly 2 but for sure 1.

 

I'm glad you decided to put more effort into the design. Without any kind of baffle, my interest was fading back to a custom fabricated tank with baffles.

From the interest seen so far to divide up cost, I don't mind paying an extra $50 in the end for more test tanks and analysis. Would be great to put a prototype on the track for testing.

Thanks for the work to bring this to the market,
Jack

 

This man has 20/10 vision indeed. I had heard some rumblings via the OG/R grapevine, and I come in to check status and behold, what do I seeeeeee

Matt, this product is coming along awesome-- you are to be commended Sir

Hell, i may just have to get one of these suckers. But, but, I kinda *like* topping off my oem washer tank at every gas fill up

 

I dont even have a AI setup and I might get one lol.

 

118. uncle *****, 1 tank, Australia

 

I'm not seeing the point of the ridge. It basically makes that part of the capacity useless. May as well just do a taper ramp from the higher flat point down towards the outlet in the bottom right corner.

 

Sit tight. I have this design as well as the original design currently going through CFD (computational fluid dynamic) testing. I'm going to test at multiple volume levels (75% capacity, 50% capacity, 25% capacity) as well as multiple lateral G scenarios.

We'll put out the best product the first time around using all available testing methods to get there.


Thanks so much. My thoughts were really with the future of this project. It'd be a shame if this part got relegated to some dark corner of the Internet after it's initial run and people talk about it like some mythical beast.

How many times to you wish you could just buy a CWC intercooler or Noltec mounts or a turbojeff battery tray / P-FC holder - only to find out they stopped making them a while ago?

Anyhow, more info to come on that.


Never too late to start!


Correct - the goal is stopping slosh under extreme situations. The question is "how?". With any design revision, there's going to be give and take (trading capacity for less chance of starvation)... and we're also up against limitations of the blow molding process.

Another idea that I'm toying with is a gradual slope along the entirety of the "left" side of the tank. Let gravity have it's way with reducing slosh. I'm a little concerned about giving up capacity, but it really might be the simplest / most effective idea.

At the end of the day, CFD testing is going to tell us what we need to know and we'll make an informed decision once we have solid data.

 

That's what I did with my design, and the sloped approach keeps water moving in the right direction (i.e., towards the pickup)

 

The slope is what I was saying.

now, there is a way to have the ridges work for you. Slope with ridges, except have a 1cm gap in the center of the ridges. Limited fluid movement. I can make a drawing if you'd like. I understand that the restriction is the manufacturing process, so we have to figure out how to make the shape a production possibility while still getting the fluid slosh control that would make for peace of mind ..

 

I agree that a slope is a definite possibility. =)

Feel free to PM any ideas, drawings, etc.

-M

 

1. Spalato - 2 tanks
2. ZoomZoom - I'm in for at least 1. Maybe 2.
3. Slideways FD - 1
4. Silvertrd - 1 tank
5. jza80 - 1 tank
6. the spyder-
7. Izanami - 1 tank
8. SpeedCrazie - 1 Tank
9. photoresistor - 1 Tank
10. jsemerica - 1 Tank, maybe 2
11. Myocardial Infarction - 1 Tank
12. Rocketeerbandit - 1
13. Brekyrself - 2
14. 20005.3 - 1
15. Knotsonice - 1
16. Kensin - 1
17.Gio612
18.7krayziboi
19.#slevin
20. Fourtyounce - 2 maybe 3. Matt Gold for PreZident!
21. One for me please, Charlie
22. Redgti (James, uk) -1
23. Khan Racing - 1
24. Sigma
25. Alex Newman - 1 (UK)
26. thatdon
27. MattUK (UK - Can post to a mate state side if required)
28. Ptrhahn. 1
29. Iantboyd - 1
30. Fendamonky - 1
31. Sc0rp7 - 1
32. ColdFeet - 1
33. jkstill
34. Montego -1
35. Zepticon - 1 tank
36. Matthew Ng - 1
37. p51hellfire - 1
38. thanson90
39. s8nana - 1 (AU)
40. Runrex -
41. Garethb -1 (New Zealand)
42. Dhanson31
43. Ondabirdhouse - 1 (possibly 2)
44. Tictakman - 1
45. BaconHunter - 1
46. Trout2 - 1
47. spirit rx-7 - 1
48. Saham -1
49. Cvzg77r-1
50. pingu81 - 1
51. moshaka - 2 tanks maybe 3
52. Ryans93rx7 - 1
53. Rarotary - 1
54. TWIZTIDRX -1
55. XPT700 - 1 tank and shipping to Scotland
56. Sukisuki - 1
57. Daleclark - 1
58. Smokey The Talon - 1
59. Ghoujoumian - 1
60. Talkwrench (UK) - 1
61. red_dragon - 1
62. Street-heat7 - 1 maybe 2
63. Jonnybravo408- 1
64. THE TECH
65. KompressorLOgic - 1
66. TurbosaurusRX
67. Nashman69g - 1
68. Selonari - 1
69. Neutron - 1
70. Stivat - 1
71. Sgtblue -1
72. mcon (Ireland) - 1
73. BlackPEP - 1
74. RoboticsRacer
75. Hai-tek7 - 1
76. Monkman33
77. DnlCappy
78. Orbitalmovment
79. Helloninja - 1
80. Sideo - 1
81. yehreally - 2
82. $lacker - 1
83. Macer - 1
84. SimonFD3S - 1 (FRANCE)
85. j_man1100 - 1
86. ncx94 - 1 (France, and could dispatch here if you want to make only one shippment)
87. wazway 1
88. 1987 T2
89. REAmFC3S 1
90. M104-AMG (1)
91. Kissama (France)
92. TomU
93. Boriboost 1
94. MaczPayne 1
95. NetSeven 1
96. B-TAG - 1
97. RCCAZ 1, possibly 2
98. rotaryfdtt - 1
99. BeREv - 1 (France - Rotorhead on RX-7 France forum)
100. touki - 2
101. - dhahlen 1, possibly 2
102. cloud9 - 1
103. Moe Greene - 1
104. seipherzero - 1
105. m4drx - 1
106. Rawbz08 - 1
107. David Hayes - 1
108. Harry SB - 1 tank.​​​​ California.
109. Net Seven - 1
110. primerGrey - 1, possibly 2
111. MDP - 1
112. elfking - 1 tank. California.
113. technomentor - 1, possibly 2
114. neit_jnf - 1
115. Deathmaker07 - Canada- 2 tanks
116. gravytraindg -1 maybe 2 depending on price
117. hyperrex - 1 tank, possibly 2 but for sure 1.
118. uncle *****, 1 tank, Australia
119. fossil717, 1 tank, Texas

 

Hey guys!

Sorry for the delay on updates. But I can assure you we've been working hard.

So over the past week, we've nailed down two updated designs, run the original designs through CFD testing and scheduled additional CFD testing on the new designs.

First of all, the amount of support and input from the crowd has been amazing and pushed us to make this the best product we can make, using the most advanced techniques available.

I'm waiting until all the data is in to share results - but I gotta say it's so cool and the ONLY way to do a project like this.

However, we have two more designs we'd like to test / share.

SLOPED


TOP BAFFLE



My gut is that the slope will actually end up being the best at controlling the slosh (gravity always wins) but I figured we should also test for the top baffle and see how that shakes out.

At the end of the day, as I've said time and time before. We really want to put out the best product and there's no excuses for not doing that, especially with all the tools at our disposal. So yes, this has added a little delay to the project, but I think the return on investment/development should be worth it.

 

I feel like the top baffle should be to the left of the fill nozzle

 

If that's a better design according to the CFD testing - we'll do it!

At the end of the day - nothing will be subjective. Testing will tell us what to do.

 

You can get a rough idea how a baffle design will handle lateral g's simply by tilting the tank by the right amount and testing with different liquid levels. Say 1.2 g's lateral acceleration added to the 1 g due to gravity, tilt the tank by arctan(lateral g's/gravity) to simulate. arctan (1.1/1) = 50 degrees.

Obviously this won't model vibration, variation in lateral g's, vertical impulse loads (bumps), constant draw, etc. Is that what you are catching with CFD?

 

Good real world idea.

However, we aren't 3D printing every design we think up. THAT gets pricey for an (arguably) less accurate test with less variables.

 

Umm, you can tilt it in CAD, then draw a line at a particular fill level and calculate the volume below that line.

 

Ah, I misunderstood. However, the point remains, the CFD testing is a bit more precise and allows us to control for many more variables.

 

Sounds good. I'm sure this is obvious, but this simple calculation represents the exact steady-state fluid mechanics solution for the ideal case of a perfectly settled car going a constant velocity through a perfectly flat constant-radius turn (and throw zero slip-angle in there too). If the CFD doesn't get this answer for this nominal test case, I'd be pretty sure there is a bug in the CFD.

So designs that don't even meet this nominal test case will not work. For example, sloped bottoms angled at less than 50 degrees won't provide any baffle effect for cars capable of 1.2g lateral acceleration.

CFD can then be used to model changing radius, vertical impulses, and all the other things that create waves and slosh.

Thanks again for all your work on this. It is a lot to take on!