Well, from the passed experience torturing my DSM it looked like different cars would behave differently with the amount of fuel needed for successful running on the course without fuel starvation. Overall, my car was able to run with 1/4 tank or even less, which was great!

Now, how things are regarding the fuel starvation issue with the EVO X? How much fuel is needed to avoid this problem?

Thanks!


Fedja

I've actually pretty much run out of fuel on a road course before in my X, and it didn't start to starve on me until it was already on E.

I was going around a carousel and leaning out. I immediately pulled off and fueled up.

YMMV.

That is a great news if we can run on low fuel!! If would suck if we would need full tank on already obese car...

Fedja

I run with a full tank, the 60lbs isn't gonna kill anything for you in a recreational event. If you are worried about the weight then pull the spare and everything and you can nearly make up for the fuel, lol.

I run with a full tank, the 60lbs isn't gonna kill anything for you in a recreational event. If you are worried about the weight then pull the spare and everything and you can nearly make up for the fuel, lol.

84lbs... ;)

I run with a full tank, the 60lbs isn't gonna kill anything for you in a recreational event. If you are worried about the weight then pull the spare and everything and you can nearly make up for the fuel, lol.
Do you really think that I would bother with few extra pounds if my goal is to run well at some local recreational events? ;)

Fedja

Your solution is a surge tank. You can run with 1-2 gallons of gas depending on the event.

You could even add a fill line to the surge tank so that you fill just that. The surge tank I'm working on is 0.75 gallons and will tuck away in the corner where that other surge tank goes (I think MAP sells it). If you go hotdog style, you can have a 1-2 gallon surge tank sitting pretty in the very middle of your trunk.

Your solution is a surge tank. You can run with 1-2 gallons of gas depending on the event.

You could even add a fill line to the surge tank so that you fill just that. The surge tank I'm working on is 0.75 gallons and will tuck away in the corner where that other surge tank goes (I think MAP sells it). If you go hotdog style, you can have a 1-2 gallon surge tank sitting pretty in the very middle of your trunk.
That would be great fix for the cars that want to race in the BSP...for those thinking about BS that doesn't help!

Fedja

84lbs... ;)

I refill at 12 gallons. I never run my tank dry. The results of even 10 gallons or less are noticeable.

Do you really think that I would bother with few extra pounds if my goal is to run well at some local recreational events? ;)

Fedja

No, not you. The other morons here that try to get 500hp and 2800lb cars just to drive to work and back. :shades:

The results of even 10 gallons or less are noticeable.
Could you elaborate this a bit more? What is noticeable if you run less fuel?

Fedja

Could you elaborate this a bit more? What is noticeable if you run less fuel?

Fedja

For weight. The amount of weight lost by running less fuel is going to be either:

A) Insanely noticeable, if you're trying to shed every single pound possible.
or
B) Not noticeable at all, if you're just racing for shits and giggles.

For him (and me) it doesn't matter, and I'd be better served by taking a power shit than trying to get my fuel under a certain amount for better times.

The math is simple: Gas weighs X. X * gallons = weight of fuel. If you want to lose Y amount of pounds, only run with Z amount of gas.

If you go hotdog style, you can have a 1-2 gallon surge tank sitting pretty in the very middle of your trunk.

http://wedontlikeu.com/images/car/EvoX/StrokerBuild2010/SurgeTank/4.jpg

It depends on the course and the driver. My first few times at thunderhill I had no problems with fuel starvation. However, as I got better, it started to become a problem. High speed left handed turns are the issue. I get fuel starvation at turn 7 and 8. At turn 7 I will sputter even with 3/4 of a tank! I'm not going back until I get a surge tank.

Edit:
I just noticed this is in the auto-x forum. My GUESS is that it won't be a problem since speeds aren't very high at an autocross... Again, it all depends on the course and the driver

Could you elaborate this a bit more? What is noticeable if you run less fuel?

Fedja

I wasn't making a reference to the weight, but rather the tendency to fuel starve. I don't run my tank less than 3/4 on events, meaning I value fuel delivery over weight. I also do not run my tank less than 10 gallons DD due to the tendency to lean out when getting in it. I was not advocating the weight savings of running a low tank, rather the unlikelihood that it would matter for the weekend warrior. Lets face it, 0.5 of a second isn't a major concern at all.

I run with a full tank, the 60lbs isn't gonna kill anything for you in a recreational event. If you are worried about the weight then pull the spare and everything and you can nearly make up for the fuel, lol.

Sure...for weekend warrior 0.5 sec is not a concern, but I was not planning to race at that level. Competition in BS (even locally here in New Eng) is very strong and 1/2 second is eternity!

So, with less fuel, car will have tendency to sputter as I am hearing here! Is that due to running lean? Does it change between 08 EVOX vs. 2010 EVOXs?

Fedja

It runs lean and sputters because the fuel pickup was designed by a drunk Russian. The fuel sloshes around enough that it fails to pick up fuel, starves, and sputters. Or, starves, blows a hole in the block, everyone LOLs. And no, there is no difference in 2008 vs 2010 for this issue.

If you're going to be doing ANY competition-level shit, do a surge tank. Do whatever sort of surge tank is allowed for your level.

Yes, Fuel must be require in the tank. Fuel is a substance that stores energy that can be extracted to perform mechanical work in a controlled manner. A fuel contains energy, especially heat, which can be released and handled then.

http://warriorwriters.files.wordpress.com/2010/12/troll.jpg

^^^ thanks for the crash course on what fuel is lolll, someone somewhere benefitted from that i guess :wtfsign:

BUMpZ~

I had serious fuel cut issues today when I went HAM on the track today. I went really, really HAM.

Granted I'm only on stock turbo, but this is the only thing I could attribute this to... I was at about a quarter tank, trying to get in the last session. I already emptied my 5gal gas can and wanted to stretch it just a little more because the track day was almost over. This was a mistake.

I have to get my butt in gear and get this surge tank done. This most certainly is a problem on stock turbo, 93 octane. I might not be guzzling gas, but it's still eff'n me on my tiny snail.

PS: forgot the details... 4th or 5th gear at 5k+ rpm

I've run my my tank almost totally empty at a few tracks and never had starvation issues. Granted, when my fuel light comes on (because I was an idiot an let it get that low), I back off a little and work on being painfully smooth... like Kieth Stone (he's smooth, and apparently I closely resemble him when wearing a hat)

http://agent3155.com/wp-content/uploads/2010/10/keith_stone2.jpg

As far as consumption goes, regardless of the track, I usually burn roughly 1 gal every 10 mins. Or when I'm not at the track, a case of Keystone per weekend.

I've run my my tank almost totally empty at a few tracks and never had starvation issues. Granted, when my fuel light comes on (because I was an idiot an let it get that low), I back off a little and work on being painfully smooth...

As far as consumption goes, regardless of the track, I usually burn roughly 1 gal every 10 mins. Or when I'm not at the track, a case of Keystone per weekend.

Fuel starvation is TOTALLY track dependent. If you have a long, sweeping, high speed, high G, LEFT handed turn, fuel starvation will be an issue. If the track you run on does not have this, it may not ever become an issue. I was getting fuel starvation with 2/3 tank. I have a surge tank on order now.

Fuel consumption for me reads 3.4mpg on my onboard computer when I'm at thunderhill.