user 72239

iTrader: (4)

Heres my recent Dyno graph.

Winter tune

21 psi

Full bolt ons



Torque was 320.

09CobaltSS1

Holy smokes that's a lean son of a gun up top.

InfraRedline

iTrader: (4)

Not bad at all for a winter tune on pump gas. If that wideband signal is correct and it is on pump gas then I agree, its getting really lean up there!

user 72239

iTrader: (4)

91 pump
21 psi
11 degrees at WOT.

09CobaltSS1

Is it commanding somewhere around .91 - .93ish lambda up top like that or is the ecm going into open loop on you for one reason or another? I know the tail pipe sniffers tend to register a couple tenths leaner (afr) as compared to a pillar mounted wideband which is reading much further up in the stream, but even at that, it's still looking a little lean for my liking. Not bad numbers regardless.

blueLNFftw

iTrader: (16)

Why no torque?

Terminator2

0.85 midrange 0.89 up top. Sniffers read leaner than actual. 91 octane 21psi 11-12* max timing. Around 110-120 whp less than his 28-29 psi ***** to the wall E-35 tune.

user 72239

iTrader: (4)

Retards didn't put it on the graph

It was 320 wtq.

Terminator2

See my post above. Absolutely Not going into open loop .89 PE lambda up top 0.85 midrange. Werts car is the same 0.85 midrange and 0.89 up top and his is holding up just fine at 29psi 445 whp and 93 octane and more timing than the OPs car.

09CobaltSS1

That sniffer must be all sorts of off then. I've seen them as far as a few tenths afr off, but .5 - .6 lean is pretty extreme. Might as well not even graph afr at that point then. lol

I sure hope they don't trust in those readings all too much when tuning on that dyno. lol

Terminator2

I never ever trust sniffers. When I dynoed my car bone stock it said the A/F was 15.4-13.6 but scanner said 0.95-0.87 lambda big error there. They get poisoned by alcohol and leaded race gas.

InfraRedline

iTrader: (4)

When I did my TVS dyno it was a little lean compared to what I usually run it at, went from 11.6 quickly to 11.8 and then 12.1 up top, and on the sniffer it showed up mid 12's up to 13.0 up top. My car also blew the sniffer out of the exhaust a little, so that may have had something to do with it lol