What do you tune for?

[Goallie11]

Ok I thought you might be using an arc2. If you had a tuning method with more precise adjustments what would you go for?

I'm thinking about where the exact point is when the car needs addition fuel to control knock and what a/f ratio it needs at that point. For example does 30% throttle need less fuel than 35% or is the increment higher or lower. At what points can we get away with an a/f ratio of 14.7 (or higher) safely?

[J. Fast]

720cc, is that the ceiling on the arc? What's the resolution on your setup?

[gltasn]

720cc, is that the ceiling on the arc? What's the resolution on your setup?

according to matt the 720's are it. he was able to use 1000 but had to use another fuel comp on top of the arc2 to get them tuned. not sure what you mean by resolution but willing to explain when i do.

if i could pick an af ratio for wot and my build with 100 octane it would be 11.7-11.8. i feel thats the best trade for safty and power. might add a pound or 2 to the fuel pressure and fine tune it that way. i hit 20lbs about once per day and havent pushed her passed that. i know shes good for 35lbs+ but 20 pulls so hard and im getting older(39) so its plenty o fun. since shes a dd i wouldnt feel safe running more boost on the streets. hell people cant fathom the speeds this car can do and pull right out in front of me. i get the shit scared out of me, by others, from time to time.

[Ninja Performance]

idle is 17.2-16.6ish
cruising is 14-13.2(about 3200rpms)
wot 11.0 but will see 12.5, awsome for pulls with race gas but, scary on pump.
egt's at wot 1250-1400f

ive got a knock control box that drops wich ever cyl is knocking, until it stops, and then adds it back in the mix.

Normally n race gas you aren't gong to make more power running that lean. It normally makes the best power almost where gas does. 11.6-11.8.

You can however run ethanol into the 12's with no issues. My car on E95/M5 likes 12.2 at WOT. Idle is around 14 as is cruise in vac.

Pump I shoot for 11.6 max 11.0 for a safe tune.

-Chris

[HLxDrummer]

Does your cel come on with it cut? That's cool you don't get a ton of knock though! Just be careful though because each bank is trimmed individually so one might be rich and one lean.

[gltasn]

ive got 3 a/f gauges. one for each bank(narrow band) and a wideband at the 'y'. heres a pic of my gauges.

starting left to right is my eboost2 ebc/boost gauge, next to the narrow bands. then i have my knock gauge(goes to the j&s knock control box)m my egt and wideband. ive never had a check engine light!

[Goallie11]

Does your cel come on with it cut? That's cool you don't get a ton of knock though! Just be careful though because each bank is trimmed individually so one might be rich and one lean.

It does but it's just something to ignore. I have my wideband in the downpipe a ways after the "y" so I'm getting the combined a/f ratio, I don't think there'd be a huge difference in the banks to need two widebands.

And like gltasn mine wasn't ever on before either until I cut the cable.

[Ninja Performance]

I have stock gauges in stock location. I have one other gauge, AEM WB installed after the two banks merge, and I normally don't even pay attention to it. If a gauge says LOOK OUT, it's normally too late. And I lke to keep my eyes on the road, not watching gauges and flashy lights.

-Chris

[gltasn]

i too use gauges for tuning but dont watch them when driving with spirit. the arm units are nice in that if it does go lean its super bright red and hard to miss.