ATT: Greenfoam.

[vsspack]

Hey Greenfoam can you add me on msn . I need to discuss a couple of bits and pieces regarding the VN tune i got.
Cheers dude
lordz89@hotmail.com

Lane

[vsspack]

1234567890

[vsspack]

Hey greenfoam, here is the dyno results
Light Blue is your tune dark blue is the holden tune.
Top Lines are afr's bottom lines are power
We gained a killowatt running your tune but it looks to be a little too lean getting close to the high 12s -13s.
Made a bit more power down low and pretty much the same up top.
Any ideas ?

For anyone else its a VN v6, shift kit 2.5"exhaust and pod filter so nothing really special, was just seeing if there was much difference to be gained from a retune on a relativly stock motor/p plater combo.

[vsspack]

Forgot to mention the car was running a full take of BP 98 Ron too just for safteys sake.

[Not_An_Abba_Fan]

There would be your problem then, don't use 98, use 95.

[vsspack]

why would higher octane fuel cause an issue? considering the stock tune ran almost a flat 11.8 AFR the whole way and the foamy leaned right out between 130kph and 170kph.

[Not_An_Abba_Fan]

Because the higher the octane, the harder it is to ignite. I would even try it on some 91. Do a run on each fuel and see what happens.

AFR's have nothing to do with octane rating. Jason leans out his tunes at cruising speeds yes, to get better economy.

[vsspack]

ok, im happy to try it on 91 octane, but if the AFR's are unrelated to the octane level of the fuel then how will running 91 octane cause it to run richer/safer ?

[vsspack]

also is it only economy out of jasons v6 tunes? i was expecting a little more than 1rkw increase, would like to hear from jason regarding the timing its running, weather it can be advanced more ect. Not trying to badmouth jason because he has been easy to deal with, just wondering if the tune requires a little more revison is all as i understand tuning without ever seeing the car is never 100% spot on

[Not_An_Abba_Fan]

Why do you think richer is safer? 14.7:1 is ideal, anything above 17:1 starts getting dangerous.

The octane rating affects burn and power, too high and it takes too long to ignite and only completely combusts after the piston is on it's way down. If you are running high compression or boost, then it will be ideal, but in a basically stock engine, 98 is too high.

[-=ApheX=-]

So what your suggesting is that it's not always a good idea to run a Higher octane fuel for city cruising?
Just curious as I run 98RON almost all the time, as I benefit out of the cleaner fuel type that it is and it's great for highway driving.
That being said as I like to give it a little around the city 95RON is an all round better performer for an N/A engine?
Not thread stealing this is still relavent! :P

[cracker]

12,13's afr isnt lean...at all

[vsspack]

Ah well thats all good then i just wanted some assurance really now i need to get to the strip n see if the tmes are better

[Not_An_Abba_Fan]

Running a fuel too high in octane for an engine not designed for it won't hurt it, but it won't be running at it's peak.

If the engine is designed to run on regular unleaded, eg 91RON, then use it. You won't gain anything by running a higher octane fuel.

98 in a VS is pointless. IMO. I think you will find it would be more responsive if you ran 95, even 91. More octane doesn't equal more power.

[padrickz88]

You might have only gained 1rwkw but im pretty sure the car would drive so much better.....

doesnt matter how much power you make, its how you make it

[TrikkBen]

Has your torque increased?

[vsspack]

Not sure on torque sounds cammed on idle and power seems a bit smoother coming on , ill get it out to the 8th mile track here and see what it can run . Id love a 9.9

[levymetal]

I believe Jason suggests his tunes to be run on 95. As for the power increase, well, the v6s are pretty damn good out of the factory. As padrickz said you can probably feel the difference, but it doesn't really equate to much on the dyno. Some gain more some gain less... Looks like you had a pretty good one to start with. There is more to gain in the 5ltrs.

I run 98 in my car because apparently higher octane fuels last longer. I only fill up with petrol about once every 2 months

[greenfoam]

Hi mate the fuel ratio is much better on mine untill 168 km/h you can see (I doubt I changed it from stock but the extra timing must have burned it a bit better), you want that in the around 12.5-13:1 range, it's not too lean, it's too still too rich onthe top end, If you want you can send it back and I'll lean it out on the top end to to try and get more power up there. The timing can't go any further on the top end not really, I allready put in a little more than they need since they all vary a few degrees on the crank and I have to allow for that. VN V6's are allready pretty much as far as they are going to go up there on the top end timing wise. But you can tell from the extra power down low that the torque down there has increased heaps, to gain just a few hp at low rpm you need large increases in torque. Anyway I'm happy to lean it out further on the top end anytime you want, but you are never going to gain more than 3-4 rwkw peak power on those things it's not like the 5litre where you can just go bang +20rwhp anytime you want since it's not that kind of motor, they just don't have it in them (but you'll get your +3-4 rwkw peak if I lean it out on the top end for you).

I don't know what your name on ebay but send me a message there, I think the last VN V6 tune I did must have been yours, if it is, it's alot leaner at cruise also so your fuel economy should be alot better, which is my main aim with these since they aren't a good motor for gaining peak power but you can only do what you can do, also all the part throttle stuff should be stronger. Like the others mentioned too, all low compression motors it will run better on 91-95 octane so don't run 98 in it. Anyway once the fuel is leaned out on top that's about as good as it's going to get. One more thing!, if you could get a good intake on it (ie pod in the bin), it will probably be able to use that extra fuel while driving and gain alot of power also

[vsspack]

Cheers for the response greenfoam, yeah i woulda been the last tune you made haha ill drop back to 95 and ive been meaning to get a standard arbox and pipe it out under the front bumper as the pods pretty crap lol . It is getting better fuel economy thats for sure. Ill be tiving ya another yell once i get a 5l at the end of the year thats fo sure. Ill post up how it goes at the strip for intrests sake
cheers for clearing everything up guys much appreciate it
Lane

[Morton]

Yes, greenfoam's tunes aren't all about peak power readings for the V6s. They're not for dyno queens - and neither are the engines. But he gains a crapload of power down low, and that's what you're most concerned about You spend more time between 2000-4000 rpm than anywhere else.

[vsspack]

This is true . The car is definatly getting better fuel economy thats for sure so its definatly worth the money

[greenfoam]

If you put a _really_ good cold air intake and _really_ good exhaust on it, you'll make more peak power, but you wont ever make more than about 112rwkw on most dynos with a VN/P and only then on a pretty healthy motor. If you want to run a 9.9 your going to have to have everything pretty spot on because not many can do that so don't be shy about asking me to lean it out on the top end a bit. But really you allreayd have the right idea, save your fuel save your money and get a 5 litre

[vsspack]

Cheers Foamy,
A mate managed to pull a 9.9 once in a VR berlina but that thing was a bit of a freak, stock with a exhaust and managed to pull 125rwk on a pretty spot on dyno. Never figured that one out to be honest but id love to beat him haha.
But yes, im thinking somthing between a VP SS or VS clubby possibly a GTS if dollars are right. I grabbed a 3rd memcal today from a wreak so ill send you one back this week and now i got a spare for a 5L tune

[NOT.BT1]

greenfoam if you read this how can i contact you i would like one of these tunes done for my vn v6 but your pm inbox is always full
cheers
brenden