Bad Fuel Economy On My R32?

[Marlboro Reds]

hi guys,

my ride is an 89 skyline r32 with the following mods:

blitz cat back exhaust

aftermarket ms air flow resetter

k&n air filter

hks evc III SI ebc set at 12psi which has been taken out

atm ive noticed my cars been eating alot of fuel even though,

i don't floor it or travel far.

but i have noticed one odd thing when i jump on the freeway

i was travelling at 100kph on 5th gear and the rev meter shows 2500-3000 rpm!!!

in a 60km zone i have to be in 5th gear as well or else the rpm will be too high = more petrol wasted

think i'm running roughly 15Lt/100kms? and trust me im no lead foot

wot do you guys think i should do?

cleaning the afm and air filter is what i have in mind right now, is it a good idea

or wot else should i be considering

any help would be appreciated

thanks

ryan

[supadan]

yer i get just on 300 to a tank with my r32 with a k&n pod 3in cat back fmic and boost at 12

[Marlboro Reds]

supa dan

wot rpm does ur car run wen going 100kpn sittin on 5th gear?

[markimak]

my 32GTR gets 400kms for a tank apprx 65-70L

K&N panel, nismo full 3.5" xhast, stock boost, Kakimoto ecu chip.

ive heard of GTR owners only gettin a mere 200kms so i thank my stars.

[Absent]

I have very similar mods to malboro and also had the shit fuel economy. Highly recommend an SAFC II massively improved my fuel economy by correcting the AFM's dodgey readings. I drive everyday and my tank is lasting at least 2 weeks.

[govich]

I have very similar mods to malboro and also had the shit fuel economy. Highly recommend an SAFC II massively improved my fuel economy by correcting the AFM's dodgey readings. I drive everyday and my tank is lasting at least 2 weeks.

Do you have any figures? I just bought one of these..i'm waiting to get it installed now and i'm curious.

As for the original post, get used to it . You can try cleaning stuff, but have a look in the other fuel consumption threads, they're all similar. My R33 returns 14.5L/100km around town with the stock ecu at best. And don't be surprised about 2500-3000rpm, that's how they're geared. For fuel economy you should focus on keeping your boost gauge as low as possible, not so much engine speed. Not applying as much throttle in a lower gear in general will save fuel compared to using lots of throttle in a higher gear.

If you can't afford the fuel, buy a <2l economy car.

[Howie]

I had a 93 R32, stock as a rock bar a 3" exhaust and pod filter, stock boost even. It was a manual and recorded about 10L-10.5L/100km pretty consistently even with some heavy footed driving.

The R34 on the other hand.... hmm

Edited August 4, 2006 by Howie

[GTAAAH]

hmm in a 60 litre tank im getting about 300 km's.. Thats about 20litres/100k's. Thats with a bit of hard driving a bit of relaxing so, go figure. Theres some threads around on checking your o2 sensor, that could be a contributing problem to your bad fuel economy, im to lazy to look em up, but your figures sound pretty good to me

[supadan]

just on about 3000

[Absent]

Do you have any figures? I just bought one of these..i'm waiting to get it installed now and i'm curious.

As for the original post, get used to it . You can try cleaning stuff, but have a look in the other fuel consumption threads, they're all similar. My R33 returns 14.5L/100km around town with the stock ecu at best. And don't be surprised about 2500-3000rpm, that's how they're geared. For fuel economy you should focus on keeping your boost gauge as low as possible, not so much engine speed. Not applying as much throttle in a lower gear in general will save fuel compared to using lots of throttle in a higher gear.

If you can't afford the fuel, buy a <2l economy car.

I used to get at best 400kms (15L/100km) to a tank now im pushing 500kms (12L/100km). Its only effective if you run more boost as the stock ecu is sufficient. Once you run more boost the ecu seems to make it run rich and blow black smoke everywhere. Out of interest what correction readings do you use mines between

-10 and -23 on low throttle and between 0 and +10 on high throttle, also getting noticeable more power low in the rev range.

[govich]

I used to get at best 400kms (15L/100km) to a tank now im pushing 500kms (12L/100km). Its only effective if you run more boost as the stock ecu is sufficient. Once you run more boost the ecu seems to make it run rich and blow black smoke everywhere. Out of interest what correction readings do you use mines between

-10 and -23 on low throttle and between 0 and +10 on high throttle, also getting noticeable more power low in the rev range.

Ah, mine's not in yet, i'm waiting for new Splitfires to arrive to fix my misfire before i get the SAFC2 tuned. 12L/100km sounds like something i'd be very happy with . But yeah, mates have told me i get plenty of black smoke under hard acceleration. I'll let you know when it's done.

[cowie165]

my 32GTR gets 400kms for a tank apprx 65-70L

K&N panel, nismo full 3.5" xhast, stock boost, Kakimoto ecu chip.

ive heard of GTR owners only gettin a mere 200kms so i thank my stars.

Good to know. Last tank I managed a high score of 511km with pods, exhaust, stock turbos/boost, stock ECU.

Yeah you drive like a granny and end up with nice economy, but no-one buys a GT-R because it's economical...

[fr0st]

My 32 sits on about 10.5L/100km. After some fair spirited driving on a cruise it went up to 11.5L/100km

I just changed to a hi-flow 3 inch Cat and sofar I've managed to get 370km and the needle is sitting just above 1/4. The stock cat was full of crap, and that can't be good for economy.

People have had good results with injector cleaner. AFM might need a clean, new spark plugs, S-AFC... they all might help.

[Haysey]

Ive got a bosch 040 that dosent sit exactly on the bottom, so i never let it get past 1/8th remaining, i seem to get 250 and occasionally push the 300 down to that last little bit.... thats the same on the highway and the city.. damn 3grand at 100kmh dosent help.....

used to it now

[markimak]

yep no one buys a GTR for fuel economy... R32 GTRs sit at 2500 at 100kph and 3000rpm at 120ish