turbogrill Posted August 18, 2017 Report Share Posted August 18, 2017 (edited) Hi, Curious to see how common it is for people to be able to run 2hours on a tank. Seems like it's pretty common for people to get fuel starvation on some tracks, and I guess some people just run out of gas. Edited August 18, 2017 by turbogrill Quote Link to comment Share on other sites More sharing options...
TiredBirds Posted August 18, 2017 Report Share Posted August 18, 2017 not a chance.... that Quadra-bog likes it's fuel. Quote Link to comment Share on other sites More sharing options...
Ron_e Posted August 18, 2017 Report Share Posted August 18, 2017 Flat out no way, we manage it. Quote Link to comment Share on other sites More sharing options...
Evilwheel Posted August 18, 2017 Report Share Posted August 18, 2017 We're really sweating it if it goes green the whole way. If that happens we are forced to 1 hour 55 minutes max for a margin of safety. Still have our low fuel light working and it reads proper on straights. So we have about a lap to a lap and a half warning depending on track length. We like a caution or two for ease of mind. Quote Link to comment Share on other sites More sharing options...
Hi_Im_Will Posted August 18, 2017 Report Share Posted August 18, 2017 Lulz, 105 minutes if I take it easy. We ran out of fuel in 81 minutes going balls-out at MIS a few years ago. Quote Link to comment Share on other sites More sharing options...
DRVOLKS Posted August 18, 2017 Report Share Posted August 18, 2017 I run a diesel VW TDI as it is setup now we can run on a stock tank 4.45 HR to a stock tank !! Please don t get mad at me it took 3 years of testing to get there. I still need to finish a full week end with out and long delays of fixing stupid parts that should not break ! Bob Mann www.DRVOLKS.com bobtec@comcast.net 1 Quote Link to comment Share on other sites More sharing options...
Administrators Bill Strong Posted August 18, 2017 Administrators Report Share Posted August 18, 2017 depends on the track. but yes. Quote Link to comment Share on other sites More sharing options...
jakks Posted August 18, 2017 Report Share Posted August 18, 2017 Yes, yes,yes, and don't know(it only made it 11 laps at Road Atlanta Quote Link to comment Share on other sites More sharing options...
mender Posted August 18, 2017 Report Share Posted August 18, 2017 No. Quote Link to comment Share on other sites More sharing options...
karman1970 Posted August 18, 2017 Report Share Posted August 18, 2017 Yes, and with a factory Honda tank! The caveat being we have been 10-15 seconds off-pace and spend less time at WOT than a lot of folks and don't push quite as hard as others might due to our current tires and their lack of grip. And our engine, though a swap, is bone stock. Quote Link to comment Share on other sites More sharing options...
3G Posted August 18, 2017 Report Share Posted August 18, 2017 We couldn't until the platform swap rule 4.6 plus a fuel cell and now we can. Quote Link to comment Share on other sites More sharing options...
rod rammage Posted August 18, 2017 Report Share Posted August 18, 2017 At least 2:55 WOT on our stock 1.6 Honda with 2 liter surge tank. Quote Link to comment Share on other sites More sharing options...
Cam Benty Posted August 19, 2017 Report Share Posted August 19, 2017 90 minutes tops at 6k rpm. 5k rpm maybe 1 hour 40 minutes. 304 V8. Mild cam, Edlebrock carb and airgap intake. Gt40p heads. We are installing F.I. Hopefully this will help some.. 17 gallon fuel cell in a Mustang. The 4.0 liter supercharger will help with our fuel consumption. 1 Quote Link to comment Share on other sites More sharing options...
Snorman Posted August 19, 2017 Report Share Posted August 19, 2017 IMO Daytona is the biggest test since the car is at WOT for so long. This year, one of our fast drivers ran a full session with very few (any?) cautions and I think no FCY and we put ~17 gallons in the stock 300ZX tank and had no cavitation. We finished 6th overall. Our 2nd car seems to be burning ~5.2 gallons per hour running it at probably 85-90% on an open track at Sebring with zero traffic. However, at ~10 gallons I noticed the car hitch in T17 so we are going to put a piece of Hydramat in it. That's on a stock Mazda 626 tank. S. Quote Link to comment Share on other sites More sharing options...
dogtired Posted August 19, 2017 Report Share Posted August 19, 2017 E36, stock tank. 105 / 112 minutes if that much. Quote Link to comment Share on other sites More sharing options...
thewheelerZ Posted August 19, 2017 Report Share Posted August 19, 2017 1:45 before fuel starve with stock tank. With surge tank no issues. Quote Link to comment Share on other sites More sharing options...
Members MR2 Biohazard Posted August 20, 2017 Members Report Share Posted August 20, 2017 It all depends no a lot of factors. The driver and track. Some track, yes. Some tracks, hecksss no. Bad fuel tracks when green the hole time Road America -like they ever fcy VIR- purple flag helps WGI- funny, thinking you would get a stint without fcy, good one Road Atlanta- give or take PIRC old configuration- new, depends on how you drive Medium and Easy tracks on fuel AMP Quote Link to comment Share on other sites More sharing options...
drKorf Posted August 20, 2017 Report Share Posted August 20, 2017 Miata yes, Yaris no. Fuel burn rate is similar, but fuel tank size is not. Quote Link to comment Share on other sites More sharing options...
Technical Advisory Committee Ray Franck Posted August 20, 2017 Technical Advisory Committee Report Share Posted August 20, 2017 I drive 4 different cars 2 yes two NO My team car yes 91 240sx 17+surge shifting at -6000 .. dr tell me of this full stint miata Quote Link to comment Share on other sites More sharing options...
turbogrill Posted August 22, 2017 Author Report Share Posted August 22, 2017 On 8/18/2017 at 3:34 PM, DRVOLKS said: I run a diesel VW TDI as it is setup now we can run on a stock tank 4.45 HR to a stock tank !! Please don t get mad at me it took 3 years of testing to get there. I still need to finish a full week end with out and long delays of fixing stupid parts that should not break ! Bob Mann www.DRVOLKS.com bobtec@comcast.net 4 hours? Wow! Is a diesel more efficient at WOT as well and why? What is the weight of the car, hp estimate and fuel capacity? So generally what is the best way to conserve fuel? Limit to only 80% throttle or something? Quote Link to comment Share on other sites More sharing options...
enginerd Posted August 22, 2017 Report Share Posted August 22, 2017 (edited) 2 hours ago, turbogrill said: Is a diesel more efficient at WOT as well and why? Thermodynamics... you can do some reading on the differences between the "otto cycle" and the "diesel cycle". "Carnot cycle" is also good reading so you can understand the 'ideal'. Diesel also often burns less fuel because they simply make less power than the gasoline engine which would otherwise be put into that chassis. That diesel VW beetle may be going 4 hours on fuel, but is it competitive on lap times? Quote So generally what is the best way to conserve fuel? Limit to only 80% throttle or something? That would definitely conserve fuel but at the cost of big performance losses. You want to shoot for a balance of less fuel used combined with not much less performance. In racing it is often better to stay full throttle but shift at a lower RPM. ICEs near redline are not operating in their optimal thermodynamic efficiency range... by short shifting at full throttle you are getting closer to the higher efficiency sweetspot. Edited August 22, 2017 by enginerd 1 Quote Link to comment Share on other sites More sharing options...
Ron_e Posted August 22, 2017 Report Share Posted August 22, 2017 1 hour ago, turbogrill said: So generally what is the best way to conserve fuel? Limit to only 80% throttle or something? Absolutely, I recommend this for everyone and it will greatly reduce your racing costs as well. 6 Quote Link to comment Share on other sites More sharing options...
karman1970 Posted August 22, 2017 Report Share Posted August 22, 2017 Plus, diesel fuel is denser than gasoline and has a higher energy content. I've been scheming on a diesel unicorn ever since the new rules came out. Just waiting to see what gets changed after this year is over. Quote Link to comment Share on other sites More sharing options...
csadn Posted August 22, 2017 Report Share Posted August 22, 2017 My idea of a diesel El Camino|Ranchero with a 200-gallong "stormchaser" tank in the bed is the reason CC has fuel-capacity limits.... Quote Link to comment Share on other sites More sharing options...
DRVOLKS Posted August 23, 2017 Report Share Posted August 23, 2017 We are pulling laps at Thompson with 100 car on it at 1.30.115 to 133.200 so we where 20th over all fastest lap of 115 cars and 5th in B class. we weigh 2700 LB race ready. tank is 14.7 GAL we run it in 3th and 4th for that track. HP is Ok Torque 300+ all in at 1800 RPM this took a lot of broken parts to get here and we still are having parts just fall off!! here it is in side vid 1 Quote Link to comment Share on other sites More sharing options...
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