Naked AV

Curious about the ideal A/F mix for a Radix setup. As you can see by my plugs below (which had 36,000 miles on them), I've been running a little rich on the 'Stock' Radix Superchips tune. Both times I went to the dyno they measured below 10:1 until about 5100 RPM's, so I got a wideband ready to go in and start tuning. Just wondering what A/F I should be shooting for.

ACPromotions

I might suggest that you go to LS1truck.com and post out for farmtruc, who isn't a sponsor on this board. He tunes Radix based GM trucks very regularly. If I had to guess, he would target between 11:5-11:9.

kbracing96

iTrader: (25)

Um... Farmtruc is Allen Nelson I belive and he and his company, Nelson Performance IS a sponsor on this board.

Naked AV

Thanks guys...

Anyone else have input?

cablebandit

iTrader: (37)

i'd do 11:5 to be safe and then you can lean on it at the track to see what she likes

Slowhawk

iTrader: (12)

It really goes by how much timing/intake temp.I like A/F around 11.2-1 on the dyno or 11.6-1 on the street but some heavy vehicles like your's like a richer 10.5-1 A/F to keep the heat down in the cylinder.

hellbents10

iTrader: (10)

The radix trucks like to be in the low 11 range with the right amount of timing.

Naked AV

A point more fuel just because my truck's heavier? Why is that? I'm confused.

2001WS6Vert

Just like a car will detonate more if your going up a hill. The more load, the more likely to detonate. The extra fuel helps to contain the detonation.

CHarris

iTrader: (5)

I shoot for 11.2 to 1 across the band. I achieve 11.0 - 11.2 across the band. Works well for me. I've got 6800 miles on the H2 so far (most of them supercharged). No oil consumption at all (meaning I haven't washed the cylinders with fuel).

ktmrider

Bingo, these rolling bricks take quite a bit more torque ( or load ) to move around. This is why you want to tune for 80% to WOT instead of idle. No loads or small throttle opening doesn't need extra fuel.
The ultimate tuning combo is wideband and EGT probes. Adjust the A/F and watch the EGT's for excess heat.
I would let your KR to the talking, but definitely start out in the 11:1 to 11.5:1 range first. 10:1 is pig rich and probably leaving some power on the table too. Just getting your A/F in the 11's will probably net you 20-30 extra HP alone.

Naked AV

Hmm, is there anyone who tunes using EGT's that you know of? I've never heard of such a thing.