Radium surge tank

[CSG Mike]

Originally Posted by GrabTheWheel

Ok Mike, you've convinced me. Now can I drive without any starvation at least to a half tank with their fuel pump hanger? Being able to convert the oem returnless system to a traditional return system seems like it would be beneficial. It would also address the filtration issue.

That, I can't confirm either way, as I've not tested or seen one in action in person

[Joesurf79]

Originally Posted by Turbo

You sure it's installed correctly? No problems with your fuel pump?


I'm boosted and can practically run down to vapours without issue. I see close to 2G's cornering and consistently hit 1.4G's braking on the track.

Yup. Pulled, checked, re-installed. It's in there correctly. Correct orientation, and flaps freely.


Regarding the fuel pump, I don't have any issues that I know about, and it is the factory fuel pump.


Headers and a 93 octane tune are all that's going on for power, so I'd be surprised if it's having issues keeping up. 24K miles on the car - how long do they last? Starving it a couple dozen times hasn't helped it I'm sure, but as long as I keep the tank at a level higher than I'd like, I don't get the starvation.


It happens repeatedly in 3 corners on one track, and one corner in another, so the issue is repeatable.

[GrabTheWheel]

Originally Posted by Turbo

You sure it's installed correctly? No problems with your fuel pump?


I'm boosted and can practically run down to vapours without issue. I see close to 2G's cornering and consistently hit 1.4G's braking on the track.

2 G's in the corners and you can run down to empty?? Umm, ok I'll bite what is your setup? You must be faster on track than most Corvettes running slicks then. Lets see some video!

[Jonsey]

Originally Posted by Turbo

You sure it's installed correctly? No problems with your fuel pump?


I'm boosted and can practically run down to vapours without issue. I see close to 2G's cornering and consistently hit 1.4G's braking on the track.

I run time trial and on E85 couldn't go below a half tank on E85 when NA or below a half tank with 100 octane when supercharged without starving when I ran the velox flap. I now have a full surge system and can run down to vapors. The track Joe is talking about is also notoriously bad for fuel starving as there are two very long left sweepers right in a row.

[Joesurf79]

Originally Posted by Jonsey

I run time trial and on E85 couldn't go below a half tank on E85 when NA or below a half tank with 100 octane when supercharged without starving when I ran the velox flap. I now have a full surge system and can run down to vapors. The track Joe is talking about is also notoriously bad for fuel starving as there are two very long left sweepers right in a row.

I was hoping you'd chime in Jason - I need to pick your brain sometime about that surge system And being faster while I'm at it

Yep, you know exactly where I'm talking about. Heidi finally had it happen - while poaching Jim's wider wheels haha! Same thing at MSR Houston coming out of the carousel running ccw

[Turbo]

You don't need a surge tank - just a properly functioning transfer pump system with an actual pump doing the transferring from one side of the saddle tank to the other instead of the vacuum-based system Toyota went all cutesy with.

[Joesurf79]

Radium Surge tank with e85 compatible pump and internal pressure regulator are coming my way. Got my order from Jegs yesterday with all the needed fittings, AN hose, connectors, etc. Just have to wire and plumb it up! Will report back on the process and function once I have it together.

[GrabTheWheel]

Originally Posted by Joesurf79

Radium Surge tank with e85 compatible pump and internal pressure regulator are coming my way. Got my order from Jegs yesterday with all the needed fittings, AN hose, connectors, etc. Just have to wire and plumb it up! Will report back on the process and function once I have it together.

You ever finish your surge tank setup?

[Turbo]

Originally Posted by CSG Mike

Are you ready to wear a fire suit every time you're in the car? Are you boosted? Ethanol?

What if the surge tank/external pumps were mounted outside - under the car? OEMs did that for decades without issue. You could even build a thick-walled housing, to protect it from damage.

I see they offer a horizontal mount system now.

[CSG Mike]

Originally Posted by Turbo

What if the surge tank/external pumps were mounted outside - under the car? OEMs did that for decades without issue. You could even build a thick-walled housing, to protect it from damage.

I see they offer a horizontal mount system now.

Still need a fire suit. It's safer in the car within the shell.

Of course, someone will do this on their street car anyways. It's their life.

[GrabTheWheel]

Originally Posted by CSG Mike

Still need a fire suit. It's safer in the car within the shell.

Of course, someone will do this on their street car anyways. It's their life.

Almost every modification you do to a car aside from brakes in someway might endanger your life. I still think the worst one is giving up the the steering wheel airbag in a street car. Mine will not be a street car for long, it's on the path to full time track car just not there yet...

[CSG Mike]

Originally Posted by GrabTheWheel

Almost every modification you do to a car aside from brakes in someway might endanger your life. I still think the worst one is giving up the the steering wheel airbag in a street car. Mine will not be a street car for long, it's on the path to full time track car just not there yet...

Some more so than others, but messing with the fueling system has much higher consequences than say... using a different brand of tires, with TUV approved wheels.

[GrabTheWheel]

Originally Posted by CSG Mike

Some more so than others, but messing with the fueling system has much higher consequences than say... using a different brand of tires, with TUV approved wheels.

Understood. It wasn't really something I wanted to do but I don't think I'd be able to make it through a single 20 minute session without starvation even with a full tank of fuel without one. I looked at the Radium fuel hanger and after everything was done including converting from OEM returnless system to traditional return system it was going to cost way more than a surge tank with no guarantee of fixing the issue. It definitley was a compromise as is everything when it comes to a street/track car.

[Turbo]

Originally Posted by CSG Mike

Still need a fire suit. It's safer in the car within the shell.

Of course, someone will do this on their street car anyways. It's their life.

Understood.


Mike - what have you done to combat this issue with your track car? You're running a boosted setup with similar HP to me in your '86.

I have had zero problems to date in mine -- but I also haven't driven any tracks with long, left hand sweepers. I will be driving a few new tracks this coming season, and I'd rather solve this issue before running into it.


I do have an idea - anyone have a picture of the top of an FRS/BRZ fuel tank out of the car I can take a look at??