AudiS4guy - NorCal

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<img src="http://pictureposter.audiworld.com/79060/air_fuel_ratio.jpg">
Was able to do a few pulls yesterday. For those in the Bay Area the dyno was done at EIP. Dyno was done using a mustang dyno. I would highly recommend their shop...Paul knows his stuff. Anyway, This was done with approx 92 octane (i probably still had some 100 from a few days prior), ~60 degrees. Base run as you could see in the subject line came out to 194 whp and 275 tq (thats with my current mods, see my sig.) Air Fuel ratio had a huge spike above 4000 rpms so we decided to just mess around with the ratio rather than boost and timing. My first tweek was Timing advance 3 and secondary fuel +6% and my car jumped to 202 whp. Still a huge spike in air-fuel ratio so kept adding fuel.

With final setting my spike in the air-fuel ratio (black line) was just about perfect according to Paul. He walked by my exhaust and said "now thats what exhaust is suppose to smell like!"

So that brought me up to 250 whp and 301 tq. I can't wait to get my exhaust on plus 100 octane. Hopefully another 10 whp. I didn't believe I would gain that much really. I thought maybe a max of 10 whp. Its raining so we'll have to wait for it to clear up a bit. We waited approximately 5 minutes after each run so I'm sure I was a bit heatsoaked as well. I logged Blocks 20, 21, 26, 27, 31 as well to make sure everything looked ok. Timing only peaked at 11. With my prior testing with 98 octane I was in the mid 20's.

Dyno day last month, iirc SAC-CA-S4:A.S.S. did a best of 282 whp and 308 ft. lbs so i'm really happy with my settings especially since he's got Ko4's and awe fueling. As reference, a stock s4 there dyno'd 170 whp 203 trq. Mustang Dyno's read pretty low but I don't care about that anyway. His Evo Dyno's at 200 whp on his Dyno and 260 on a dynojet if anyone cares about the numbers.

After I got off the Dyno I went for a drive and felt a HUGE difference. It reminded me of the time when I first got chipped. LTFT 1.3%,-7.8%,2.3%,-8% (not exact but close enough so that you get the idea) I remember Mike aka Mr Piggy saying that he targets around -7% rich so that good to hear. Raced a Heavily modded MR2 last night (DP,Catback,fmic,15psi and a few other things) and pulled about 2 cars before I shutdown due to cars ahead. On my way home I did a FATS test and the weird thing is my FATS time went to 5.48. If I had gained another 55whp and 35 wtq, don't you think i'd be in the 4 second range? If you click "My FATS Testing" in my sig you'll see that I got 5.35 on 93 octane. I'm sure FATS time and actual HP are related somehow...anyone have an explanation? TIA

I'm going back to the shop tonight to fine tune things a bit more. Any suggestions in regards to tuning settings? Paul believes he can squeeze another 10-15 hp.

johnstons4

Was the original pull done with your car stock?

AudiS4guy - NorCal

No, baseline pull is what I have on my car currently. See my Sig. Lemmi Tweaks only last night!

PSmalls::DoggieStyle

Ummm, that's a lot of added fuel. That is all.

oldyellar

nice write up.

AudiS4guy - NorCal

yes i know Doc.

DarinS4Turbo

+55whp by lemmi-tweaking AMS Stage 1!? What was before/after air fuel ratio (hard to see graph)?

JBear::FATS

Thanks.

Seems like alot of added fuel to me, I know my AMS SW (Stage 5 and Stage 1 for that matter) seemed to hover around 0 with LTFT's in my experience. GIAC likes to run on the rich side which in my experience has meant more power.

PSmalls::DoggieStyle

I'd love to see 02 voltages, correction factor, kv's, overall timing, etc.

DarinS4Turbo

Have you logged your MAF lately? I wonder if it's reading low, hence the need for so much fuel