Tofuball

Allright, I'm converting to the RB full True Dual system, and because of this, I cannot get a Wideband O2 reading for both rotors at the same time. The Wideband is used by the MegaSquirt (An aftermarket EMS) to constantly correct the A/F ratios based on a VE (Volumetric Efficency) table.

I was wondering if it was allright to just take signal from the front rotor, or if at lower RPMs the pulses would be too spread out to get a good reading (or something weird like that)

scathcart

FJO makes a dual channel wideband, and it is a fantastic unit, though you pay for it.

You can go ahead use one of the rotor runners if you'd like... personally, I would put it in the rear rotor path, they tend to blow first, though on an N/A, the front secondary rotor is the last to see fuel flow.

silverrotor

iTrader: (1)

"front secondary rotor"?

scathcart

front rotor's secondary injector... I slept poorly last night.

silverrotor

iTrader: (1)

Just joking with you Sean, I know you are usually right behind the 8-ball.

scathcart

I like my Del Motley crue banana's when they are a little bittersuite.

Tofuball

Hrm hrm. Thanks for the info

I've already got a wideband unit, the Techedge, and it works with my MegaSquirt

So you say that I should put the WB in the Front rotor, as it would run leaner?

1987RX7guy

iTrader: (3)

I'd say pick up a used EGT guage and buy two bungs then note what EGT's you get@ X-AFR and then drop it in the other exhaust tube, monitor it just incase

Tofuball

Man, I've had terrable luck finding used EGT stuff.

Theres a dual EGT gauge out there in the right size (2 1/16?), but I forgot where it was :p That would be perrrrfect.

Most of the Dual EGT gauges out there are for aircraft use and not avalable in that size :O

EDIT:
But googling "Dual EGT", I did find http://www.flyinmiata.com/index.php?...20%20OFF-WHITE :-D

EDIT #2: Found http://store.yahoo.com/nisongerautomarine/3-gmpyd.html

CokeRx7

I say go for the #2...

Now would it just be possible to just get 2 gauges for each individual rotor?

Tofuball

Yeh, but that is xpensive!

Tofuball

I'm still wondering:

At lower RPMs, would the pulses be too spread out to get a good reading?

chris_stampe

It might help to put it further away from the engine to reduce the pulsing, but it doesnt seem like you would have a problem....but then agian Im a turbo person...

Travis R

I don't think so.
I would just get two bungs. Tune it with the WB in one, then put it in the other tube and adjust accordingly. Adjust the map for which ever rotor runs more lean... And that might vary dpending on RPM. So you might have to switch the sensor back and forth a couple times, but you'll end up with a very good (safe) map.
Good luck!

HAILERS

http://www.pegasusautoracing.com/Pro...s.asp?RecId=65

Bad2ndgen

You will over heat your o2 sensors if you run them that close to the motor. I would just use a good wide band down stream a little and then run two egt's to balance the rotors. This is exactly how my setup is and it seems to work great.

trainwreck517

iTrader: (1)

You know what thats a good question, when I had the wideband in on my true dual header I was getting very lean a/f at idle.. around 18.. We figured my injector was a bit cloged on the rear rotor causing it to be so lean.. Would go down with a big of load.. but we figured the reading was wrong so we stoped tunning.. never thought of pulses being to spread apart so it couldn't get a good reading.

Tofuball

Interesting, thanks for your input Trainwreck.

Bad2ndGen, I wasnt refering to putting the O2 sensor that close, I was refering to putting the WB02 that close.

HAILERS: YOU RULE.

Bad2ndgen

I was talking about the wb02 sensors... All of wich don't like excessive heat, not only can you burn up the sensor but while its working you can get false readings. I always try to run my WB's at least 36" from the collector or the turbo, wich ever the case may be.

Just trying to help.

Tofuball

Sorry, I misphrased, a lot was going on in the room
Replace "WBO2" with EGT :p

36 inches sounds good to me, thanks for the number