Hi guys,
Just after some feedback. I've got BC spec 3 cams in my car running stock bottom end and quads...
Are these cams too big to hope for any decent fuel consumption?
Share your experience with aftermarket cams and fuel consumption please.
Shiraz
By reasonable fuel economy I mean 350km on an EG civic tank town, maybe 400 on the freeway?
they are small cams
depends who tune it last, should be able to get better economy than that
I was under the impression that they are 'small' cams as well. Those are the figures I am aiming for... I am not getting anywhere near that now!
Mainly freeway/off peak driving I might get 300km to the tank. Daily city-urban driving, I get around 260km. I've calculated my consumption is usually around 7km/L (or less), which equates to 14-15km/L. It's similar consumption to my dad's 260kw atw daily driven GTR, except he has a big enough fuel tank to handle it!
Get the tune looked at. I know im getting about 400km to a tank (standard dc5r tank) of mixed day to day driving which is half half street/urban driving and hwy driving, that is running Toda spec C's, 550cc injectors, walbro pump and high comp bottom end.
What ECU are you running?
Have you tried not shifting around the 8,000rpm mark?
Cause I found that to be my problem. I only manage about 280km from a EG tank.
But I mean it all works out cause you get to where ever you're going much faster.
got some spec3+ in my b18
get around the 10l/100km mark lately after being tuned
just minor ihe stuff, no quads
generally city driving, 4-5000rpm shift points in first and second gear and depending on whatever speed i need to be at generally shift through to fifth and just sit at the speed limit
I've been driving even more conservatively than vinnY with this car... Car has had lots of tuning done, but now i'm taking it in for specialist tuning. This thread was just to try and ensure that I'm not chasing something unobtainable (i.e. if the cam is not able to produce reasonable economy).
10L/100 km is good... I'll be happy with that!
If it had alot of tuning, then why does it need specialist tuning? :pQuote:
Originally Posted by STiR
depends how conservative you are with the throttle though
i'm under 30% throttle about 80% of the time, the other 20% is getting it up to speed on freeways of course ;)
how much are you actually filling up at the pump?
you'd be surprised though, i've found with my car that light throttle and slightly higher rpm shifting points seems to get better fuel consumption than heavier throttle and lower shifting points(er only when the engine is up to temp though otherwise rpm's don't see over 3000rpm which is annoying with a 4.75fd box,)
Poor tuner :( hehe.... Also unsuitable ECU for set-upQuote:
Originally Posted by Benson
Filling up around 35-36L with around 240-250km maybe. I don't use a lot of throttle around town either.Quote:
Originally Posted by vinnY
Yes it is very annoying when driving cold... even worse with my 4.9FD box hehe
oh wow that is crap consumption :p
see how it goes after the tune man, maybe the itb's really chomp down the fuel?
i'm just using the stock dc2r im and a larger throttle body
changed the fuel filter lately?
ITB's can make your fuel consumption suck ass if the tuning is no good, especially on the B-series cause it has no wide band correction.
I use to normally get around 350km's a tank city driving (B18CR ITB's, 4.9FD).
Now with my K I get 500km's+ :D
Anyone with a ITB'd K to compare?
Barefoot, would it help with the ITBs on the B-series to have closed-loop lambda control, as available with MoTeC M400?
take a trip to sdyney for better tuners. haha
I'll have to stop 4 times on the way to sydney for fuel. I'll also go deaf at 100km/h at 4200rpm...
ITB on K around 380 -400km's on 40 ltrs tankQuote:
Originally Posted by barefootbonzai
If Motic M400 requires a wide band o2, then i'd say yes it'd help. But as it is, you should get at least another 100km's a tank if you got a decent tune.Quote:
Originally Posted by STiR
Nice.Quote:
Originally Posted by EG5
i had these cams in my type R i onli got 320xxx with ripin it
Quote:
Originally Posted by STiR
It will be worth your trip. :p
would the stock bottom end last with the spec 3 cams?
i don't see why not?
i got fully build engine, b18c2, high compression piston, rebore, with buddyclub spec 3 cams, spring n retainers and skunk2 cam gear, after tuning, im getting an average of 400kms full tank, thats city n highway drive, and i like revving my engine from 1st gear to second gear, and thats wat i get, since my aircon not working im getting 435 kms.take ur car for a tune and youll get a better fuel consumption.
That's excellent fuel economy. Car is at Chasers Motorworks and tuning will be complete by the end of the week, will give some feedback then. Are you also using hondata NA15BS?
no, im using chrome, tune by toda, adrian,, hope you'll get a good results...
Oh ok well that's an excellent result. We'll see how it goes... thanks for the support (Y)
Just an update, my car has had extensive tuning all of today and yesterday. So far on the dyno everything has been improved, I get the car back tomorrow and I'll update this thread when I get some consumption results.
Updates!?
I pick up the car this afternoon at 2. 123kw atw was the most we could get before it stopped responding to timing changes etc. Very interesting to note mugen twinloop made only half a kw less with same curve as 2.5inch straight pipe (no muffler). There was over 100km done on the dyno but I'll see today whether it was worth it.
Doesnt sounds surprising. We had similar result when we change a straight pipe to a cannon (top fuel) muffler.
Do you have a a pic of the dyno graph? Dont worry about peak power, its the middle bit that counts
I picked up the car this afternoon. After Paul's tuning on the motec m400 over the last few days it feels like a totally different car. The street map makes the car extremely civilized and tuned for economy on light-medium throttle and cruise, with noticably more power throughout the entire range than before. On track tune the throttle is extremely lively with a/f ratios tuned for maximum response and power.
The car starts quickly and from cold it gets straight up to 1300 rpm (where it stays).
The car is most definately quicker now, all the parts are coming together with this set up.
Interesting to note, tuning was conducted with and without airbox+filter on ITBs, as well as with mugen twinloop and straight pipe, however no more power could be extracted. So it's just as powerful in civilized street mode as it is in aggro race mode!
For a professional tune in Melbourne I've discovered Paul @ chasers is hard to go past.
Will post dyno sheet as soon as I get scanner hooked up...
Here's a graph...interesting to note it looks almost identical to my the old tune on the power FC but its MUCH quicker and definitely has more power now, EVERYWHERE.
Car drives like a standard car (very easy even from cold, and is showing to be much more economical already)
http://gallery.me.com/sti8/100011/Ci...12392350080001
i told u on the lorne cruze that ur problem was with ur original tuner...........
i havnt had experience with paul myself....but a few mates have and are not happy.,.....so its good to see ur happy
I was aware I needed another tuner and another compute but I didn't know which at that time.
I spent a lot of time sussing Paul out and he knows a lot about tuning and especially setting up motec. I also spent a few hours with him while tuning in the car and out and he was systematic and extremely thorough. He did about 150km of tuning and it shows.
I made sure he knew what I wanted out of the car which I think is important.
well done mate. more, smoother power - and i bet better economy - gonna make u happy as hell :thumbsup:
Finally drives like a normal car until you open the throttle. iTBs behaving very well having been set up properly now and giving accurate TPS readings.
So far so good, I'm quite impressed the car is finally showing it's potential :) track next month!
first tank of fuel i including stop/start driving and some highway cruising and back-road blasting was 307km with 38L of fuel (just under 8km/L). My fuel tank must have some issue because I actually ran out of fuel at 300km lol. Seems like its not picking up that last 6 or 7L...
So far so good on the tune though, good stuff
thats good to hear man! This should be a lesson for every one that their are numerous downfalls for not picking the right tuner... shit fuel economy and drivabilty is one of them
what fuel are you using?
my last two tanks of petrol have been bp ultimate(shell vpower previously) and i've been getting about 8.8l/100km so far, pretty happy
Great to hear.... see ya at winton. :)
I'm using BP ultimate as well, however my set up is a little different. Quad throttle always seems to use a bit more fuel than single throttle set up (also makes quite a bit more mid range power (12-15kw).Quote:
Originally Posted by vinnY
You're getting around 11.3 km/L which is excellent. I'm happy if im getting 8-8.5 around town. Seems to be quite a bit of pop-pop-popping from the exhaust when I back off and change gears which I quite like, but maybe it can be cleaned up a little further.
Hope to be at winton, if they offer me a place! (on the waiting list). Most likely I will be up there that Friday though for open practice.