E36SS

Just wrapped up my 99 BMW 328 LS1 swap and finally got some numbers. Car is running a stock T56 with Stock M3 3.15 gears. Has no A/C or power steering. Car was tuned at Hinson supercars. Car pulls great and can't wait to get some 1/4 mile times this spring. So far it's been a ton of fun surprising a few SRT chargers and TA's

Current mods:
PRC 227
228r 114 LSA
American Racing 1 3/4 headers
Ls6 intake and ported TB
Custom 3 1/2 intake piping
Exhaust is dual 3" to single 3.5"



423 hp
402 tq

AINT SKEERED

iTrader: (2)

Nice pulls. Still ls1 or ls6 intake?

AINT SKEERED

iTrader: (2)

See it now. Ls6. Good power

thunderstruck507

iTrader: (18)

Does that graph say you are hitting mid-high 13s for air/fuel or am I blind?

If so I wouldn't be beating on it until that was richened to 12.5-13.2

_GTO_

Lean is mean , I bet it will put down more with stabled richen AFR .

E36SS

The guy who tuned it has been doing this for many years and has tuned some really serious cars. I trust his tune and have been running the hell out of the car ever since. Also not sure if it matters or not but in a BMW the only place for the O2 sensors is about 6 inches after the collector on the long tubes. I know the further down stream the O2 sensor is the more it affects the reading.

JakeFusion

iTrader: (7)

I assume Hinson uses a wideband on the dyno. So that's true A/F. And it's pretty lean...

thunderstruck507

iTrader: (18)

Location of the stock narrow band 02 sensors doesn't really come into play here.

Agreed. Like I said, there may be an explanation for it but I would definitely be questioning it with my tuner.

Not only that, but if it really is that lean there should be more power there with a proper mixture. Especially if timing had to be pulled to allow the lean mixture to run without knock retard.

kinglt-1

iTrader: (26)

Agreed with above it's too lean. #7 is going to get pissed real quick.

E36SS

Well I installed a wide band today and did a little testing on the street. The A/F consistently in low 13's 13.0-13.2 all the way to 7k.

AINT SKEERED

iTrader: (2)

Thats fine unless your running 10% ethanol. Then I like 12.5/1

DietCoke

iTrader: (18)

Ethanol doesnt change what a wideband reads. It reads lambda, not a #.

JakeFusion

iTrader: (7)

Stoich is different though with 10% ethanol vs straight gas. That means stoich can be anything between 14.68 to 14.13. And you want you tune around .87-.88 Lamda as most street engines make optimal power there.

So setting Stoich to 14.13 in the HPTuners or EFILive and then running about .88 Lamda ends up around 12.4. You can play with it a little, but the 12.5:1 A/F ratio is a good mark on the E10 blends. On straight gas, 12.8 probably works better.

13.2 is way too lean. Adding gas will add power and a level of safety to the motor.

AINT SKEERED

iTrader: (2)

I'm aware of this if your wideband is set that way.
I set my stoich at 14.12 and and as stated below command .87 lambda .
Air fuel is between 12.2 -12.5 at wot.


Thanks , you explained it well

AINT SKEERED

iTrader: (2)

What's bad is if you run e10 and expect it to be 10% your mislead. Run some test and get ready to see as much as 20% ethanol.
I'd rather be on the safe side, I recently quit running erhonal in my trans am

JakeFusion

iTrader: (7)

If I could run straight 93 all the time, I'd love that.

AINT SKEERED

iTrader: (2)

There are several stations local to mr who sell strait gas.
Currently I'm running 91 oct. But have a store with 93.
My car is only 10.3/1 so not an issue.

Jason 98 TA

iTrader: (4)

Get some fuel into that thing!!