710 replies to this topic

[Soop]

WTF? He won't show you how he tuned *YOUR* car? I'd say because he did such a sh!t job of it. Is the guy actually a Mechanic? I'd have thought anyone who's allowed to tune a car proffesionally would have enough of an idea to know the difference between a naturally aspirated car and one with forced induction.

[Blaeven]

WTF?

He won't show you how he tuned *YOUR* car?
I'd say because he did such a sh!t job of it. Is the guy actually a Mechanic?
I'd have thought anyone who's allowed to tune a car proffesionally would have enough of an idea to know the difference between a naturally aspirated car and one with forced induction.

i watched him tune it... i saw how he did it...

it was a decent tune... just running rich...

[Xon]

he's a turbo tuner...

that's why i've got to take it to someone who does NA motors... (preferably hondas, so he/she can tune the vtak properly)

I don't see why you'd need to take it to a honda tuner. Mild tune below x rpm, hardcore tune above x rpm. Any good NA tuner should be able to do it, especially seeing as most manufacturers seem to have some form of vtec/what ever these days.

[Soop]

How was it a decent tune if its using 20ltr/100km and its an NA 3ltr ffs. Honestly, grow some balls and ask him WTF is going on.

[B4TT]

he didn't want to put the AFRs on the dyno graph cos it shows how he tunes...

load of crap IMO...

the AFR sits around 13 for most of the chart... (running rich because it's safer iirc)

and it spikes up to 14 (maybe even richer) just before 4000rpm because he was worried about it pingging during the cutover from avls...

IMO it probably needs a retune by someone who tunes NAs... like a honda tuner or something... if it was leaned out and more timing pulled (and had a better flowing exhaust) it should make closer to 160kwatw

You mean leans out to 14? 14 is leaner then 13 remember. (I don't mean that its lean but the AFR is getting leaner then it was)

[Soop]

Considering 14.7:1 is stoich, I'd say thats oright. Does it pop and crackle a lot on overrun? You didn't drill a hole in the fuel tank did you?

[Blaeven]

sent him an email!

You mean leans out to 14? 14 is leaner then 13 remember. (I don't mean that its lean but the AFR is getting leaner then it was)

sorry... i couldn't remember which way was leaner and which way was richer...

then the AFR sits on 12:1 for most of the rev band and gets richer before the cutover... i can't remember how much by, but i remember the afr dropping (to 11 maybe?)

is 14 stoich???? fark it's running rich then...

i guess that makes sense then, the lower numbers would be further down the chart...

i remember him saying that most tuners would tune it to 13:1 but 12:1 would be safer...

it lets out a nice pop whenever i hit the clutch to change gears... and it smells rich whenever i give it a bootful...

[DRIVER]

sent him an email!

if its wrong or has some issues you arent driving to qld again for a tune.... but if you need a good tuner i know a great one local to me, he does awsome work....but he isnt cheap...

[Blaeven]

if its wrong or has some issues you arent driving to qld again for a tune.... but if you need a good tuner i know a great one local to me, he does awsome work....but he isnt cheap...

mark gave me the number of the ViPEC tuner in sydney... he said he'd help me out...

[B4TT]

Yeah 12 is pretty rich.. don't really need it that rich i wouldn't think... perhaps ask some tuners who have done this kind of work?

[Blaeven]

and it smells rich whenever i give it a bootful...

the smell actually reminds me of a supra i saw on the dyno at autosalon (that put down 1000kw or so)

probably why it's underperforming though...

i wonder if i'd be any closer to 160atw (which is what al still thinks it should make) if it was leaned out properly...?

[B4TT]

No reason you shouldn't be able to pick up a few HP if it is running really rich...

[Blaeven]

Could be the weather conditions or the factory 02 sensor feedback might be playing up…

Fuel econ also has a lot to do with the right foot as well…

The cold start fuel enrich works till the engine reaches 60 to 70 deg water temp…. so it should only run rich for a few minutes….

Good too hear you got home okay…

Cheers, mark..

Keep an eye on the fuel consumption without flogging it and if its not better you might need to see scott at insight for a tweak… as a last resort…email me first…and I will call him…

[DRIVER]

If nothing happens off this let me know and ill call Michael thats tuning a cresida for a mate of mine, he can sure help...

[Blaeven]

If nothing happens off this let me know and ill call Michael thats tuning a cresida for a mate of mine, he can sure help...

i'm more worried about getting it engineered first...

parents won't let my drive it till it's engineered... cos if i crash then i'm rooted!!!

[Soop]

As far as I'm aware, the idea with NA tuning is to get the mixture just lean enough so that it doesn't detonate and advance the timing slightly. So I was told by the guy that did my car. (As I remember it anyway.) My car has an AFR of around 14.2:1@6500rpm. Which is pretty lean, but it doesn't ping at all, even in 45c heat .

[alexGT]

i'm more worried about getting it engineered first...

parents won't let my drive it till it's engineered... cos if i crash then i'm rooted!!!

this was my number one priority mate. you would be in tears if you had a prang and all that money went to waste!

once everything is legal and ready to go then you feel good about it too!

[Blaeven]

this was my number one priority mate. you would be in tears if you had a prang and all that money went to waste!

once everything is legal and ready to go then you feel good about it too!

i'd better get my act together to get it legal for next wednesday, otherwise it might not make an appearance at the hooters meet...

how hard was it/how much did it cost/what did it involve??

[alexGT]

i'd better get my act together to get it legal for next wednesday, otherwise it might not make an appearance at the hooters meet...

how hard was it/how much did it cost/what did it involve??

thorough run over your car.

best advice is to list all the mods on paper for the engineer rather than them scurrying around the car looking for them.

they will weigh it to make sure it is not unsafe/exceed australian design rules (ADR)
also they will check the difference in capacity/cylinders, your is a newer model motor so emission wise you should be fine. i have seen a lot of other vehicles that have taken a bigger capacity/cylinder increase.
they will check your brakes are up to scratch to handle the extra power/weight.

only thing i'm not sure is how you will go with the aftermarket ECU. you could just say its standard as you have to lift up the carpet to check... depends on the engineer.

edit: forgot to add, depends on mods on the car for the cost.

mine was $550.

my mods were:
manual gearbox swap (originally auto)
wrx motor (stock sti cooler, airbox etc etc...)
b4 rsk front seats
turbo bonnet
316mm gt brakes 290mm rear
3inch TBE

[Jeff]

OK....... seeing as your seem to be having trouble with your tune.... i thought I'd have a quick look for a quick reference for you regarding AFR please note that this is just a quick reference.... 6.0:1 Rich run limit 9.0:1 Low power, black smoke 11.5:1 Rich best torque at WOT 12.5:1 Safe best power at WOT 13.2:1 Lean best torque at WOT 14.7:1 Chemically ideal 15.5:1 Lean light load, part throttle 16.2:1 Best economy, part throttle 18-22:1 Lean run limit