600kms From Tank

[75coupe]

Geez, 500 - 600ks from a tank thats something I would never imagined in my r33...

I did a test driving like a granny shifting always through one tank at 3500rpm and aonly got 375ks and that was really trying... I;m running pfc and 3.5in zorst... the rest is pretty stock...

Maybe I should get it tuned again.. I've asked three different shops to retune and they all say nah I wouldn't retune it its pretty damn right on...

maybe I'm just a lead foot and don't realise or my tacho is lying...

[paulr33]

a few things to note

cruise AFRS should be tuned (usually under 3 grand is the spot to be tuning)

make sure 02 closed loop feedback is on

make sure you have a working 02 sensor (replace it every 50,000k's, if youve never done it, get a new one now)

dont vary the throttle over and over, keep a steady foot

dont boost the engine up, engine load uses more fuel

sometimes it may be more economical to run at say a bit higher rpm and less load then lower rpm and higher load

ie:

2900 rpm with load row 5 in 4th gear

vs

2100 with load row 12 in 5th gear

[mad082]

it also depends on where you live. i live in a pretty hilly town, so while i spend some time going down hill at little or no throttle, i also spend time going up hill at a much higher throttle percentage.

the best economy i have gotten was 410k's to 45L. that was about 80% highway, and 20% hard driving round town (a little bit of that with a car full of people). thats just under 11L/100ks.

[Al]

i cannot see why a different octane rating would yield different economy? i would love for someone to show me how ?

best ive got in my r33 pfc was 550k's to a tank, and it wasn't empty

Cheater

That was when you were cruising to Sydney at 110km/h all the way

What is your average milage?

I get about 320km to a tank, with 260rwkw, but my car is a weekender (not even sometimes ), so when i drive it i like to drive it , fuel consumption does not bother me at all. If i want to save fuel, i leave the car in the garage and take the company car .

[paulr33]

average milage is 400k's to a tank with 02 feedback turned on now

nothing cheating about it

the drive to sydney was with 02 feedback off

ive since turned it on and i was a bit suprised its given me some better economy on the street ,even tho my normal afr's are pretty lean

[Busky2k]

sometimes it may be more economical to run at say a bit higher rpm and less load then lower rpm and higher load

ie:

2900 rpm with load row 5 in 4th gear

vs

2100 with load row 12 in 5th gear

That doesn't tell you much though! Best way to judge fuel economy is to sit at speed in various gears and note the injector duty cycle!

Btw I experienced notably better highway fuel economy when leaned to ~15.5:1 AFRs by switching off O2 feedback and adjusting the IGN/INJ trim.. I'd only advise it if you have a wideband though....

[paulr33]

the best way to judge economy is with a wideband

but yeah i did the same, tuned afrs with closed loop off

i wouldnt be using inj duty as the way to work out afrs, althought it can be used to "guesstimate" them

[sigsputnik]

i get about 520ks to a tank, and it's not empty when i fill up. i use shell vpower. those are city k's, up/down hills etc.

r32 gtr, mods: mines ecu, steel wheel turbos, turbo back exhaust, 550cc injectors, greddy oil management, trust air pods. i have a powerfc ready to go in.

i reckon i could do better but my twin plate clutch means i have to give it some juice to move off the line.

edit: 520 kms / 51 litres used = 9.8l/100kms.

Edited December 21, 2006 by sigsputnik

[mad082]

well mine average is about 16L/100ks. in the missus SSS pulsar i get about 11. on the highway i get about 9 in the SSS and 11 in the skyline.

but i do drive rather spiritedly a fair bit of the time.

[tridentt150v]

Another way of looking at it:

I get better mileage out of PULP on my bike, if I have to use ULP I hit reserve 25km earlier. I try to use PULP all the time, cos I can get that bit further [motorcycles aren't made for pushing] and get to the next town.

The economy doesn't add up to the extra cost, PULP is more expensive no argument. But the convenience of not having to 'short fill' = being able to make the next town makes it worthwhile.

[shanef]

i got 604km's out of a tank in my gtr. did not hit boost (clutch was soo badly stuffed) all hi-way driving, and was on the fuel light for ~80km's, when i filled up it took 67 litres

[discopotato03]

Not everyone agrees on this one but I feel my R33 could do with a slightly taller final drive not so much because I want to have taller overall gearing but because I'd like a bit more load on the engine at round town speeds . I find myself short shifting this car all the time but then my style of driving is probably different to most . I like the idea of more load on the engine so throttle is opened a little more and dynamic CR a little higher . By using V power racing 100 pump fuel and tuning the engine exclusively for it both consumption/power AND throttle/boost response should improve . For the twenty someting cents a litre over power kero gade unleaded I can live with this . I might add my car is not daily driven either , have a nearly dead roller skate for general use .

Cheers A .

[gtst25]

Not everyone agrees on this one but I feel my R33 could do with a slightly taller final drive not so much because I want to have taller overall gearing but because I'd like a bit more load on the engine at round town speeds . I find myself short shifting this car all the time but then my style of driving is probably different to most . I like the idea of more load on the engine so throttle is opened a little more and dynamic CR a little higher . By using V power racing 100 pump fuel and tuning the engine exclusively for it both consumption/power AND throttle/boost response should improve . For the twenty someting cents a litre over power kero gade unleaded I can live with this . I might add my car is not daily driven either , have a nearly dead roller skate for general use .

Cheers A .

Got to agree there,

I've allways thought that - I've allways been annoyed with the short first gear - to keep up with the Jonses in commo taxis etc you end up doing 4000rpm gear changes 1st to 2nd all day long - gets annoying all day everyday and must be a bit hard on the synchros stopping the gears all the time.

My best rb lazy drive was my old clapped out vl na 5 speed - heaps of tourque and you weren't doing first to second gear changes in the first 10 metres.

Cheers

Edited December 22, 2006 by gtst25

[Guest 40th-edition]

sorry dudes, havnt got a computer at home...

iv got 3" zorst, fmic, boosted to 11psi.

alot of my driving is h/way living 33kms from work so it is cruzing alot of the time but also some around town driving... nothing unushual that what i use the v-power fuel for.

just seems to get a noticable diffrence in economy.

one bad thing is i dont have that fuel any where in my normal day to day area of driving.. need to go min of 100kms away to get it, so by the time i get home its about the same! lol...

cheers for the replys

[sigsputnik]

i remember reading an old issue of wheels that discussed how that united boost98 was meant to be really good, and gave reasons. i'll see if i can dig it out.

[mad082]

i get about the same top speed out of each gear in my skyline as i did in my 180sx, the missus SSS pulsar, and my old 5 speed falcon. the nissans just rev a lot harder to do it. but the falcon at 4000rpm sounds like its reving a lot harder than the nissans