Fuel consumption on the track?

manga_blue · Postby **manga_blue** » Tue May 21, 2013 5:57 pm

rascal wrote:Is that how you justify it to the missus?? Honestly honey, I'm saving us money by getting an ECU...

You know you can't do that, Russell. Anyone who claimed a payback on just one mod is then wide open to questions about a cost/benefit analysis and payback period on every other mod. Even mentioning that the fuel consumption is so much better after the ECU invites a query about how much fuel were you using before the ECU. Relationships can be clouded by too much detail.

mazmad · Postby **mazmad** » Tue May 21, 2013 6:31 pm

Sounds about right. Thanks.

Hellmun · Postby **Hellmun** » Tue May 21, 2013 8:00 pm

From brimmed to the top to spluttering at the fish-hook I managed 66 laps at wakefield in the 300 a few years ago. That was 0.57 litres per lap assuming I got exactly 40 litres in it. Mine made 90kw...though I'd have to go dig out that dyno sheet to see what my AFR's are like.

mazmad · Postby **mazmad** » Tue May 21, 2013 9:11 pm

mazmad wrote:Sounds about right. Thanks.

That was directed at Charlie Brown. Although it also applies to manga blue......'need to know basis' approach works best for me. And I definitely do not need her to know.

evil_weevil · Postby **evil_weevil** » Fri May 24, 2013 7:55 am

No idea what my nugget does but easily half a tank for full day MRA.
My old r33...tank for just a supersprint!

stb · Postby **stb** » Fri May 24, 2013 2:11 pm

I'm around 36l/100km on track - NB8C motor running on e85 (no boost). Lines up with most people's ~25-28l/100km on 98.

mazmad · Postby **mazmad** » Fri May 24, 2013 2:42 pm

Cool thanks.

Magpie · Postby **Magpie** » Fri May 24, 2013 3:38 pm

stb I have been pondering my fuel supply since I'm going to run E85 and if a standard NA will have enough to do a 1 hour with no refueling. My plan is now to swap the NA6 for a NA8 tank and put a 5 ltr surge tank in the boot.

stb wrote:I'm around 36l/100km on track - NB8C motor running on e85 (no boost). Lines up with most people's ~25-28l/100km on 98.

zero00 · Postby **zero00** » Sun May 26, 2013 11:57 am

I've done the sums for my NB8A from the Track Day last Monday at Queensland Raceway

Total from 'fill to fill' = 39.3 Litres for 387km

Track kilometres = 109
Road Kimometres = 279

Based on an average for 'road kilometres' of 7.5L/100km it calculates at:

20.9 litres for 279km = 7.5L/100k
18.4 litres for 109km = 16.88L/100km

project.r.racing · Postby **project.r.racing** » Sun May 26, 2013 12:13 pm

Magpie wrote:stb I have been pondering my fuel supply since I'm going to run E85 and if a standard NA will have enough to do a 1 hour with no refueling. My plan is now to swap the NA6 for a NA8 tank and put a 5 ltr surge tank in the boot.

stb wrote:I'm around 36l/100km on track - NB8C motor running on e85 (no boost). Lines up with most people's ~25-28l/100km on 98.

get a 10L surge tank if you are allowed to run that bigger size.

E85 drinks 33% faster then regular fuel.

track use is 3 times the fuel you use on road use, rough guide. so about 24-27L/100km for regular fuel, so add 33% for E85 = 32-36L/100km. goes in line with an earlier post.

so every 5L you can gain, gives you 14km (on E85) track usage. so 5 to 7 laps extra at most tracks roughly.

stb · Postby **stb** » Tue May 28, 2013 2:07 pm

Having done some long runs recently for modern regularity, an hour is probably possible with NA8 tank. I was using ~2/3 of a tank in ~45 minutes of running. Other MX5s were running 1.5 hour stints without refueling, so in theory at least 1 hour should be possible on e85.