200+kW Fuel economy

[abcent]

Just wondering what sort of Km's people are getting out of there 200+kW R33 gts-t's? and what A/R ratios are at full boost.

my car has 224rwkw@6500rpm on 18psi boost, (can get 238 running 22psi, but no thanks)and even though I never expected great fuel economy.....i thought it would be better than what I'm getting, even just cruising round granny shifting I'm LUCKY to get 300km out of a tank.

car mods (power relevent):

RB25DET....obvioulsy..

Blitz S/S mesh Air pod

Front mount HKS Intercooler

HiFlowed Turbo (steel wheels, larger wheels etc....)

Largest Bosch intank fuel pump available (cant remember number)

Malpassi adjustable fuel reg

standard injectors (just maxing out at full boost)

still standard BOV (seems to work ok...any thoughts?)

HKS Dump pipe

Blitz stainless 3"front pipe

Kakimoto 3" cat back exhaust

and a Microtech LTX-12 with controller running it all

I've heard of cars running greater kW than mine getting better fuel economy than me....so whats evenyone else doing that I'm not? or are most of us in the same boat?

Cheers

[PranK]

i was getting 350 klm's from a tank in my R33 Gtst @ 170rwkw.

My R33 GTR made 235rwkw and when my power fc is tuned nicely (as its really not atm) I will get early 300's.

I know neither of those are like your setup, but it may help.

[BHDave]

You may find that the microtech isn't helping things unless the LT series actually have closed loop mixture control at cruise.

Piggybacks and pfcs retain this function which is one reason they can still give decent fuel economy.

[benm]

186rwkw R33 GTS-t and get anywhere between 400-640km depending on my driving style. (The 640km stint was done on the way down to the Summernats and back so basically 85% highway driving)

I drive around on 7psi tho with a standard ECU (rich), big difference to 18psi

[Revhead]

I have no idea how much power mine is making (or "was" I should say, my coils are dying now...) but I'm averaging around 450-500km to a tank. That's with a T3/4, pod, and a PowerFC that's pretty much on the base map (I tidied it up a bit but nothing much). When the car was 100% stock (stock exhaust, stock everything) I managed a 900+ km trip (which was nearly all highway km's) on one tank.

All things being equal, you could make 600hp out of your engine, and still retain acceptable fuel economy. It all depends on how much of that power you use, and how often One other point to make - be proactive about your driving. Look ahead, and prepare for things before you get to them, don't wait until you're already there and then react to them.

When I'm driving along on the highway or whatever, I always back off the throttle to the point JUST BEFORE the car will start to slow down, rather than backing off until the car stops picking up speed or just holding your foot in one place. As you approach a hill (not once you're already at it), give just enough throttle to get the turbo spooling lightly and let the car hold speed up the hill. A lot of people get to the hill, the car slows down a bit, and they react to the car's slowing down by accelerating back up to the limit, which uses more fuel and is nowhere near as smooth. If you get caught in heavy traffic, smooth out the stop-start movement by averaging the speeds the cars in front are doing. They'll go between 0 and say 20km/h, you could sit on around 10km/h in first gear, idling along, using bugger all throttle and reducing the number of times you have to start from standstill. These kinds of things becomes second nature and do make a big difference to fuel economy.

[Cubes]

The microtech doesn't use a closed loop oxygen sensor.

Thats the problem with your fuel economy.

This is why i'm going for a PowerFC; wolf 3d also has support for closed loop oxygen sensor however it lacks the sequential injection that also helps improve fuel economy and a little better power (supposively).

[Zahos]

200 rwkw@9psi

350km hard driving

~390 granny shifting