tuning air/fuel ratio

[mattytm3]

I live in northeast CT and I can't find a dyno shop that is relitively close to where I live. I need to get my car dialed cause it runs lean at about 4 grand. If any body is from the area and knows a good shop to go to please help me out. I also only have a HKS super AFR so thats really all I have to work with.

[M3 Kid]

ICS Performance in Stamford CT. www.icsperformance.com

[BeRzErKaS]

If there aren't any dynos in your area then why not just fix the problem yourself.

I'm guessing you already have a wideband02 since you know its leaning out at 4k. Can you log data? I'm using an SAFC-II but the HKS unit shouldn't be too different.
1) pick your rpm points above 4k
2) turn the knob to the RICH side
3) check your datalog to make sure your curve is sitting where you want it

Problem fixed ...and it didn't cost you any money!

[mattytm3]

The wideband02 must be an air/fuel meter, right. Well I dont have that one but I do have another meter problem is I ve never did it before so I don't know where to hook it up at to see if I am lean or rich.

[Q5Quint]

please sell me your car

you can get a decent air/fuel narrowband meter for about 60$ from napa, and you hook it up to your o2 sensor.

A wideband is about 200$ and you have to drill/tap/make a hole in your exhaust for it, and a nice guage is about 200$, though it wont really tell you anymore than a narrowband.

Remember that cars were tuned with screws and 'feel' before the narrowband, so even that is a major improvement.

what engine management are you running?

[matt325is]

Originally Posted by Q5Quint

you have to drill/tap/make a hole in your exhaust for it, and a nice guage is about 200$, though it wont really tell you anymore

Not really.

The Innovate LC-1 wideband sensor controller is probably the cheapest on the market. It uses a Bosch LSU4 5-wire wideband sensor, and is very sesitive (8:1 afr - 22:1 afr). It has multiple outputs so you can connect one into the stock ECU (if you still use it), and one into your HKS Super AFR or a regular narrow band gauge. You can tune the outputs to read as a normal narrow band o2 sensor, but with the accuracy of a wideband gauge. Narrowband is good for telling you if you are lean or rich. Wideband is good for telling you HOW MUCH you are lean or HOW MUCH you are rich. They can sense almost every exhaust pulse if you set the sensitivity that way. I have the LC-1, and its probably the best decision I've made.

matt

[card counter]

call ICS

[BeRzErKaS]

Originally Posted by Q5Quint

please sell me your car

you can get a decent air/fuel narrowband meter for about 60$ from napa, and you hook it up to your o2 sensor.

A wideband is about 200$ and you have to drill/tap/make a hole in your exhaust for it, and a nice guage is about 200$, though it wont really tell you anymore than a narrowband.

Remember that cars were tuned with screws and 'feel' before the narrowband, so even that is a major improvement.

what engine management are you running?

I'll 2nd matt325is statements and say the Zeitronix Zt-2 wideband doesn't require you to drill or tap anything either. I've been using it's simulated narrowband to feed my ECU for months and the A/F is spot-on.

Not the cheapest option, but I got the full setup w/ the digital LCD display monitoring lambda, A/F, BOOST, and EGT. The SAFC-II displays RPM, %MAF Air , Fuel Correction, and Knock/Ping level. Both units are mounted side-by-side where the sunglass holder used to be. Everything you need w/ no ricey A-pillar gauges.

In car tuning is a snap... check the data log from the Zt-2, turn the knob on the SAFC-II and watch the A/F display change in real time.

The two have proven to be a pretty sweet combo for A/F tuning.

[paul e]

>> Narrowband is good for telling you if you are lean or rich. Wideband is good for telling you HOW MUCH <<

Which means that a narrowband wont decipher between 11:1 and 14:1.. Youll see 'Rich' in both cases.. Pretty useless. A narrowband is pretty useless in doing any meaningful tuning with your FI application.

You dont need an expensive gauge to show the result.. Innovate's LM-1 comes with a handheld display which is ideal for tuning, and capturing results, while displaying the results at the same time. One other point.. If youre mainly interested in WOT afrs, you dont need to install a pre-cat bung. You can buy from them an accessory which will insert and hold the wide band O2 sensor deep into the tail pipe, and it will work the same way the sniffer at the dyno works: at WOT, the effects of the cats are minimized as O2 is scavenged clean above ~3500 rpms, and your result will be very similar to a reading taken pre-cat. Ive compared readings taken pre-cat and in this method, just as with a dyno's sniffer in good shape, and the results are all very close to one another.

[bmxcm]

www.victorresearch.com