11.2 Air/ Fuel ratio, too rich ???

[Jase EK]

hey there

did a air fuel run in my car.. and got 11.2 after 4000rpm, and finish at 12 at redline.. is this too rich ?

[Slow96GSR]

I think that might be a lil rich. I don't think I've ever gotten that rich even with out my turbo. We do run different up at this alt. so down there I can't be 100%. Also I set most of my cars up to run for races, even the daily driver!

14.7:1 is stoic just for those who don't know/remember!

[dsp26]

Jase EK.. what setup are you running??? that is way too rich for NA and rich to ok on turbo depending on setup...

***EDIT***
Slow96GSR, yeah thats true that 14.7 is stoich/ideal but there is no way in hell i would run that with a CR of 11:1 which i'm sure Type Rs have.... maybe if i had a DECENT rising rate fuel pressure regulator. i had 14.3:1 on mine once below 4000rpm and pinged with 95oct RON... but then again the SR20de CC isn't anywhere near as detonaion resistant as and vtec head....

[saxman]

hey there

did a air fuel run in my car.. and got 11.2 after 4000rpm, and finish at 12 at redline.. is this too rich ?
are you running less than 15 psi of boost? if yes, yes, that's way too rich

[saxman]

14.7:1 is stoic just for those who don't know/remember!
stoich is great for cruising, but under full throttle, it's really not ideal for n/a or fi

[Jase EK]

its NA.. i changed intake manifold, and fuel pump so far, back then when it was stock, it was still little rich. Im most likely installin fuel reg and adjust less pressure..? untill i get ecu i'l get it tuned up..

[dsp26]

fuel pump bigger than stock?? that will have raised your fuel pressure... get an AFPR or a fuel pressure gauge tapped in at least.. i betcha any money your above stock psi....

[Slow96GSR]

...there is no way in hell i would run that with a CR of 11:1 which i'm sure Type Rs have....

IDK about there but all the CTR/ITR's here have a 10.5:1 CR. We will be there to collect you motors if they do have a 11.1:1 CR!! Start pulling! LOL!

Here is the EDIT part. Thought some info on AFR's would be helpful!!

General one:

http://www.ite.edu.sg/~brweb/AT/air_fuel.html

Honda made:

http://www.g-speed.com/pbh/afr-o2.html

Using a air/gas analizer to fix yer car:

http://www.interro.com/techgas.html

Edelbrocks Tech tips, use the links on page to nav to the others!!

http://www.edelbrock.com/automotive/sport_compact/tech_1.html

Did that help? I'll post more when I have time!

[tinkerbell]

its NA.. i changed intake manifold, and fuel pump so far, back then when it was stock, it was still little rich. Im most likely installin fuel reg and adjust less pressure..? untill i get ecu i'l get it tuned up..

no ECU errors?

sounds like it is in "safe mode" :thumbdwn:

it would help if you could actually describe your setup.

slowgsr - our B18C7's are all over 11:1 CR...

[saxman]

sounds like it is in "safe mode" :thumbdwn:
safe mode = no way for him to get to 4000 rpm, much less redline

[Jase EK]

mmm.. here we go
yes.. the pump is bigger than the stock one.. however, when the engine was in, the stock 1.6 cxi pump wasnt enough for the engine.. so i upgrade 2 walbro 255, im not sure about the ecu codes as of yet, atm the engine check light is always on, but im sure thats because of my IAC Valve not wired up.
Im most likely goin to install a AFPR and gauge this week, wondering, what should the PSI be ??

So Dsp26, you think it might be the pump ?

thanks

[dsp26]

mmm.. here we go
yes.. the pump is bigger than the stock one.. however, when the engine was in, the stock 1.6 cxi pump wasnt enough for the engine.. so i upgrade 2 walbro 255, im not sure about the ecu codes as of yet, atm the engine check light is always on, but im sure thats because of my IAC Valve not wired up.
Im most likely goin to install a AFPR and gauge this week, wondering, what should the PSI be ??

So Dsp26, you think it might be the pump ?

thanks

i'm now definate its the pump that increased your fuel pressure... i have a 2.0l and even 225 is overkill for it. I can't remember the specs but i know the Walbro 255 had a significant enough fuel pressure of its own over a factory 190. your car being a 1.6l would definately have had a significantly smaller pump....

i guarantee its the pump.... save yourself some $$$ and BORROW a fuel pressure gauge off someone.....

not sure what your psi should be, i'd resort to an FSM or ask someone on here or in your section for the VAC ON/OFF tolerance levels

when you do install an AFPR, ensure that you only fine tune it at idle on operating temp..... at idle speed, there should be a reading with the Vacuum line on and a higher reading when the vac line is unplugged.... check that both are on par with stock as i do not know.....


***EDIT***
what do you mean the stock pump wasn't enough? was the 1.6 a covnersion?? or its a stock car stock engine? if its the latter then your pump was just on the way out and an oem replacement would have sufficed....

[dsp26]

oh and if your even tempted for a second to get those cheap eBay AFPRs with built in gauge for cheap from overseas dont get it. i have one and the rising rate spring is shit.... would definately blow a worked motor....

[tinkerbell]

um, dsp26 the fuel pressure regulator controls the fuel pressue, not the fuel pump...

and JaseEK stop wasting our time and find out what error code it is...

[EfiOz]

IDK about there but all the CTR/ITR's here have a 10.5:1 CR. We will be there to collect you motors if they do have a 11.1:1 CR!! Start pulling! LOL!

Here is the EDIT part. Thought some info on AFR's would be helpful!!

General one:

http://www.ite.edu.sg/~brweb/AT/air_fuel.html

Honda made:

http://www.g-speed.com/pbh/afr-o2.html

Using a air/gas analizer to fix yer car:

http://www.interro.com/techgas.html

Edelbrocks Tech tips, use the links on page to nav to the others!!

http://www.edelbrock.com/automotive/sport_compact/tech_1.html

Did that help? I'll post more when I have time!

The first guy is on drugs!
The second one is a discussion of how to hack some copyrighted circuitry.
The third is interesting but for different reasons.
And the Edlebrock page doesn't even mention AFR.

[EfiOz]

The fuel pressure reg won't be able to cope with the volume a 255 Walbro can pump. The arenh't even set up as a return reg to start with so they'll have no hope with a pump that big.

It's the pump.

[dsp26]

um, dsp26 the fuel pressure regulator controls the fuel pressue, not the fuel pump...

and JaseEK stop wasting our time and find out what error code it is...

um i know that... eac fuel pump has a different flow rate hence the ratings... each pump also creates its own pressure.

the spring in the stock fpr is setup for the stock pump.... bigger pressures created by the bigger pump will push the stock fpr over its limit....

[weezer]

The fuel pressure reg won't be able to cope with the volume a 255 Walbro can pump. The arenh't even set up as a return reg to start with so they'll have no hope with a pump that big.

It's the pump.

yep thats true. Over the weekend my walbro died and we put a stock pump in and on idle it would read in approx 17 on the wideband. Then we put a different walbro in and it read in the 14 range.

[dsp26]

aaahhh... thank you Efioz/weezer.

i can't believe i was even bothering researching flow rates to prove a point....

i was gonna say, coz before i installed my AFPR with a built in gauge i had just a normal guage tapped in and know the fuel pressure increased with the stock fpr when i switched pumps... regardless what car, they all work the same.

[Jase EK]

thanks for your great help !
update news, is.. immah install, Sard fuel reg, and get autometer gauge in psi.. see wat it reads.. if 2 much.. adjust it.. if not.. try stock pump again..

you guys agree to this ?

[dsp26]

thanks for your great help !
update news, is.. immah install, Sard fuel reg, and get autometer gauge in psi.. see wat it reads.. if 2 much.. adjust it.. if not.. try stock pump again..

you guys agree to this ?

how about you just buy the gauge first to see what comes and then decide if you need the SARD fpr <-- that thing is kinda pricey!!!