Ecu = Power/fuel Ecomony

[suprahb]

hey poeples, who here has got a piggyback ecu on there n/a, and what sort of power you getting, and how good your fuel economy is, i want to get e manage set up on mine but is it worth it? does it make much difference on an n/a? im after 600km a tank, is it possible?

just a quick note i own the neo6 r34

[SKiT_R31]

hey poeples, who here has got a piggyback ecu on there n/a, and what sort of power you getting, and how good your fuel economy is, i want to get e manage set up on mine but is it worth it? does it make much difference on an n/a? im after 600km a tank, is it possible?

just a quick note i own the neo6 r34

its possible...

you really need a decent tuner, lean the car out (into high 13's flat 14) at low throttle, and under heavy throttle/WOT as lean as possible without your egt's getting too high.

alot of tuners are scared and live by the doughy rich 11:1 'safe' tunes, a decent tune with a decent engine should be able to hold 14:1 at WOT on an N/A. (I know of a 500hp n/a that ran this)

so hunt a good tuner, not a 'drift' one, maybe somone a little older, into motorsport, and lean away giving it as much timing as you can, that alone should net you a fair bit better economy. Also pushing it into closed loop as often as possible.

ontop of that, you could run even leaner, and run water injection (water is free) to cool your egt's - im currently playing around with this for my 30de (alot of timing, high compression and lean a/f mixes).

Edited March 31, 2008 by SKiT_R31

[ginger]

Hey,

I dont have a piggy back, but from a recent trip to thredbo, 5th gear the whole way i used 38litres to 450k's.

City driving i can expect a max of around 500k's to a tank, i would also be interested if a management system would improve fuel.

[Eug]

i use an safc2.

the regardless of ecu/piggy back, it is only good as it's tuner. there's nothing else really.

i would check the power/dyno thread for more details, because that's what it's there for!!!

[suprahb]

Thanks for the replies and advice.

i use an safc2.

the regardless of ecu/piggy back, it is only good as it's tuner. there's nothing else really.

i would check the power/dyno thread for more details, because that's what it's there for!!!

using the safc 2, how many kms do you get out of a tank.

[Eug]

450km aggressive tune. check out the power thread for a list of mods.

to be honest, fuel economy is pretty crap. a turbo's efficiency is so much better in terms of driving off boost in the city, and on boost whilst tracking it.

unless you have quite a few mods which is out of the scope of the stock ecu and you wish to clean up the AFRs a bit i personally wouldn't be too phased.

one of the reasons for the SAFC2 was to have the knock sensor when on track.

[suprahb]

fair enough, 450km with a tune on a na skyline, thats pretty poor lol, there must be ways to better that, the power thread you say, i will check it out thanks for the help.

[casuarina26]

It will depend on how you drive if you drive hard all the time economy will be poor, on the other hand if you drive it easy with the odd blat here or there economy will be better. Avoid short trips only drive medium to long.

I have a stock R34 N/A with the Neo 6 motor, 5 speed manual & I can get about 550K's before the low feul light comes on, I drive it easy & only drive medium to long trips.

I am thinking of fitting cruse control to help with economy [have had cruse on my other cars & got good economy out of them].

When I get it serviced I will talk with my mechanic about leaning it off  abit.

Hope this may help

Cheers

[suprahb]

damn thats some good milage, ok when you say take it easy when driving, isnt it bad for the skylines to shift to early and drive it at low rpm? at which rpm do you change gears? i average mine at 3000 rpm all the time, and yeah my fuel ecomony is non existent, i think i might need on of those safc's and get some tuning of some sort going

[SKiT_R31]

damn thats some good milage, ok when you say take it easy when driving, isnt it bad for the skylines to shift to early and drive it at low rpm? at which rpm do you change gears? i average mine at 3000 rpm all the time, and yeah my fuel ecomony is non existent, i think i might need on of those safc's and get some tuning of some sort going

It really goes more by throttle and load than revs, for example - if your shifting at 3000rpm, and using half throttle to accelerate on gear change (to pull it from ~ 2000rpm to 3000rpm again) its actually more efficient to rev it to 4000rpm using less throttle.

i.e. its more efficient to rev the car at 4000rpm on 1/4 throttle than at 3000rpm half throttle, as the motors in its power/torque. The idea is to use less acceleration, if you go revving it to 4k on half throttle, it'll use more petrol. When I'm tight for cash or babying the car to make it to the servo, i just drive as if 10% throttle is WOT, so if your in low revs and the car isn't accelerating, shift back.

its all about airflow, more air = more petrol, so the more air your letting in, the more fuel can be added, but at the same time, the higher its revving, the more air thats is sucked from the same throttle opening. There are other variables, like high load = richer fuel mix, too high revving will make too much friction etc.

I usually drive with a fairly active throttle, fairly heavy on take off, but as the engine revs & power increase, i keep lowering the throttle, so the engine essentially holds the same power. But at the same time, i have my fun and give it the stick fairly regularly. On my last 2 cars (both N/A RB30's, one auto one manual) i happily got 550km till fuel light (about 50-55L) this includes a fair bit of hwy cruising though (to and from work).

I don't know how your getting such bad economy, check your 02 sensor, clean or replace your coolant temp sensor, don't thrash it when its cold (richer fuel mixture), if all else fails, get a safc tuned lean on the dyno at low throttle, should be safe.

[Sandeep]

is that 450km of highway driving or just normal suburban driving? if it's just 450km of suburban stop/start driving then it's not too bad... I've fixed alot of stuff on my car and I just did a cruise yesterday and got 600km from my tank (10L/100km) and could get about 700km if I do only highway driving. Don't get an SAFC until you're 100% sure that any problems are fixed... tuning over the top of problems isn't a good idea and you'll get better results if you're 100% sure your car is upto spec. Usually the problems that cause poor fuel economy are just sensor related, it's just a case of tracking down the sensor that is playing up and fixing it.

damn thats some good milage, ok when you say take it easy when driving, isnt it bad for the skylines to shift to early and drive it at low rpm? at which rpm do you change gears? i average mine at 3000 rpm all the time, and yeah my fuel ecomony is non existent, i think i might need on of those safc's and get some tuning of some sort going

[suprahb]

thanks for the replys, my car also has slight backfires when at low throttle when its slowing down, it sounds hot for a n/a but yeah its never good for the ecomony, that why i reckon it need a good tune, im gonna assume its burning more fuel then it needs to if it has slight backfires, which gurgles as i slow down, what you guys n gals reckon about this?