RX-8fan01

anyone that is trubo and have a A/F gauge what gauge are you using and what are you A/F's around at idel and WOT and cruise .... The reason i ask is b/c it seems mine are a little diffrent day to day .

thanks shane

cretinx

On my RX-7 I ran an 11.0, on this one I'm running a 12.0 and it seems fine.

youngpit

where is your sensor placed before or after the stock sensor. i am not to sure where to tap it in.

RX-8fan01

well i but mine after the cat ... But you will get a better reading if you put it before the cat ...

slavearm

Definately put it before the cat.

RX8FOREAL

I have an AEM wide band A/F meter. My idle starts at about 15 then goes to 12-13 for a few minutes and then settles at around 15.1 to 15-8.
The gauge begins reading values at 11.0, but at WOT there is no reading which means the car is running below 11 which I think is a little too rich. I plan on bringing the car to Acosta to tune to around 11.2 at WOT after they return from racing in a few weeks

army_rx8

optimun is what 14.5 a/f for max power or something like that?...but chances of knocking and detonation is super high right? so for turbo's i thought most like to stay in teh 12.5 range? at least i've seen rotarys aroudn that. anyone have a link someone can read up on turbo'd rotarys?

army_rx8

on a side note rx8forreal how do you liek teh goodyear f1's ? i need nowe tires and i'm thinking of those or the toyo proxis t1-s. anythig nthoughts?


P.S. sorry for the thread jax..i can't help myself:p

RX8FOREAL

The F 1's have been a great wet and dry tire. I would get them again. Check out tire sizes on tirerack.com, I believe the Eagle F1's have the best review.

Icemastr

14.6 is stoich, it is the best for fuel mileage and around what your average naturally aspirated non-hi compresison car runs. 12.0:1 is about where the most power is made. 11:1 is about where you want to be in my experience with previous 13B Turbo motors, however I havent tried a turbo on a renesis yet so can't share my experience there. I would not try even being close to 12.5 in a turbo rotary. Unlike a good piston motor, a rotary cannot handle any detonation. I am actually pretty surprised you guys are running 12.0:1 if that is under boost.

guitarjunkie28

less fuel with less timing, or more fuel with more timing.... it all balances out one way or another.

Icemastr

This is true but timing from what I have experienced is harder to tune in a rotary than the air fuel ratios. There are only a few people I will trust to tune a turbo rotary for me. I had a so called "experienced" tuner tune my car and it ran great, however when I had someone else tune it later on they were amazed I hadn't blown my engine with how terrible the timing map was, it was tuned way to aggressively for a street car but when it was retuned it was still making almost the same power with way better driveability in the lower RPMS and a much better transition of the sequential turbos. I am not an experienced tuner I have just played around with the datalogit and a wideband with a Power FC and tried to learn what I could from people with more knowledge so I can't be going to in depth with this stuff but I would be kind of surprised to find out some of you guys posting in this thread know a lot about tuning a turbo rotary since there are probably only 4 people in the country I would trust tuning one.

cretinx

I was pretty blown away by running a 12:1 myself, because my 7 ran an 11 all day long (and got 12 mpg). Anyways - the new Renesis can take a TON of abuse, way more than the old 13b. There's a guy in Puerto Rico running 19 lbs of boost on stock internals with no porting!

RX8PR

We maked a lot of dyno runs on our RX-8's and this RENESIS engine runs a lot better on
12.5 FAR. We don't have any detonations problems.
Onb the beginning we was afraid of runnin to lean but at 11.5-11.9 FAR range we feel our cars to rich, when you push the pedal to full throttle the car "opens" to slow. If you want more HP you would find them over 12.0 FAR.
On our experience this new engine runs better near 12.5 FAR .
At the end off the day it's a different engine....................

Some people are afraid that we run a Renesis engine 10:1 with 19 psi boost (12.5 FAR), As and example, here a few local S2000 (11:1) owners are running at 16 psi boost making 400HP without problems and they use their cars as a daily car.

The key is tuning.


Manuel

RX-8fan01

Well..... I am running 11.2 at WOT . and 14.9-15.3 at ideal ..... i dont know though i do need to tune my car but seems to be running great . every once in a while i will get a little bit of smoke out of it but nothing crazy. Also when i let off the gas it goes to around 16 or so ..... If i wanted to tune my car what would i have to get ..could you list it for me and all that kind of stuff i honestly dont understand the whole "tunning" thing


Thanks
shane

zoom44

im not turbod but..
you should be at 14.x to 15.x at idle. the pcm is in total control at idle/close loop and will always hunt for that afr.

second i was running yesterday and noticed that when i come off the throttle from cruising that my afr goes to like 20.18 or possibly greater since it was always exactly the same number which seems to be the leansest the o2 sensor can read. anyone else seeing this lean? i didnt actually check the timing to see where it was....

guitarjunkie28

^what you're seeing is the decel fuel cut. just about every fuel injected vehicle has it.

the ecu (pcm, by obd2 standards) turns the injectors off when it sees zero throttle above X rpm (usually 2000-2500). saves gas and prevents popping noises and roughness on decel.

Icemastr

Yes if you set the ECU to keep the injectors on you can throw some huge flames when you accelerate than let off the gas and coast. Dont worry you dont need fuel when the engine isnt doing anything.

zoom44

i understand its a fuel cut i am just wondering if there is any chance for detonation at all. and also if other peoples numbers jive with mine

RX-8fan01

Zoom44 my car does the same thing .. at WOT what does the O2 sensor read ???

zoom44

wot at what rpm? i dont have it infront of me but i can check when i go out for a run next time.