Just finished my first endurance race in a 1g DSM!

[s1ngletracker]

For various reasons we couldn't get it much lower for this race, and sans windshield:

https://scontent.xx.fbcdn.net/hphotos-xpa1/v/t1.0-9/11760059_799071776970_7285761824193014515_n.jpg?oh =77be33405f47081478c971fdd71e9b00&oe=56578DA7

[curt_gendron]

That is awesome. And I agree its nice to see a DSM out there being very competitive!

[s1ngletracker]

I'll be posting a build thread for this soon. This community has a staggering amount of DSM knowledge and I'd love to harness some for the benefit of racing this thing. Stay tuned!

[asshanson]

What sort of times were you seeing at MAM? And what were the top competitors getting?
Congrats on being 4th in class! Good to see a DSM doing work on track.

Edit: are you guys using slicks or street tires? I.E what type of event was this?

[s1ngletracker]

World Racing League, 9 hour race saturday, 7 sunday. GP2 class. My best time was a 1:49.7. Street tires. GP1 class cars were around 1:45 for the top time I think (boxsters, corvette)

[Shane@DBPerformance]

We are limited to 180 or higher treadwear street tires. The DSM handled fairly decent for stockish replacement shocks and budget suspension work. It doesn't have much power, so it's not making up much time in the straights.

[s1ngletracker]

My fuel setup, which I was pretty proud of, and worked great in 100+ *F.

http://i.imgur.com/EQKj2hQ.jpg

[asshanson]

That's awesome guys. Let me know next time you run at MAM, if I don't have plans I'd definitely like to come see some racing (only 2 hrs from me).

And BTW that fuel setup looks so terrible...... lol
Of course I'm kidding, but I'm curious about a couple things. Just at the output of the lower/final pump, there is a secondary line to the FPR. Is that a "T" there? It looks like it but I see no fitting. But if so, I like how it's diverted back to a vertical surge tank so the slosh doesn't affect it on corners, a very good setup.

Last question which I've always wondered, does significant back pressure on a pump hurt its life? In your setup you have 2 pumps feeding the surge tank, but most of the time that's not really needed, so they are forced to provide much more than required volume. Consider below scenario:

Pump 3 at bottom is acting as feed for the fuel system. 99% of fuel from the regulator is passed back into the tank at idle.
At the same time, pumps 1 and 2 (top) are trying as hard as they can to push new fuel to the surge tank.

So you get all 3 pumps trying to put fuel pressure into the surge tank. I've never understood how this doesn't cause pumps to fail. Maybe in real work scenarios it works, and maybe I'm missing a key physics element.

EDIT: or maybe the surge tank is at like 150+psi, but I would assume the FPR would be affected at that point, delivering higher than desired pressure alwyas.

[s1ngletracker]

You're very close, but bottom pump is lift pump feeding surge tank

[Shane@DBPerformance]

The 2 main pressure pumps don't run at the same time, one is backup pump that can be switched to on the fly when one of the pumps starts failing in the middle of a race, which has happened many times.