PDA

View Full Version : A/F for n/a is mine ok?


clutch797
05-08-2008, 03:01 PM
Ok so when i would do a wot run my a/f would stay 12.5 to 13.0 and i thought that was a bit rich. Now i have pulled some more fuel out to get an a/f ratio of 13.0 to 13.7. Is that to lean? I'm posting a data log up with it. I think it's ok but just want to make sure i don't need to add a bit more fuel. I have tuned out all the knocks for wot but i still need to work on part throttle.
My setup:
k24a1
sri
megan mid pipe
no cat.
Thanks guys.
clutch797
05-08-2008, 06:20 PM
anyone?
talonXracer
05-08-2008, 06:41 PM
I would let the engine get above 180-184 when dataloging.

Also with a SRI you will see some knocks come summer with a higher A/F like that around town.
clutch797
05-08-2008, 06:54 PM
So would it be better for me to get them in the 12.5-13.1 range?
talonXracer
05-08-2008, 07:06 PM
Yeah that would be alot better, no sense in running lean. Add some fuel and try advancing the ignition a little bit to see if you can make a little more power that way.
clutch797
05-08-2008, 07:11 PM
I got all knocks out from 3k and up but i was knocking like crazy below 3k. Ill add some fuel and add a few degrees and see what happens.
davisj3537
05-09-2008, 07:18 AM
I would let the engine get above 180-184 when dataloging.

Also with a SRI you will see some knocks come summer with a higher A/F like that around town.

I'm confused as to why it would knock in the summer...wouldn't it knock in the winter?
BlownSi05
05-09-2008, 07:42 AM
I'm confused as to why it would knock in the summer...wouldn't it knock in the winter?

the inlet temps will be higher in the summer since the outside air is warmer. it will also lean out slightly in the winter since the colder air is more dense, so there is a chance for slight knocking in the winter as well. one thing to keep in mind with A/F is to remember that fuel also helps cool the motor. it is better to be safe than sorry. i would definatly agree with talonx, get it around the 12.5-13 range and you should be ok.
davisj3537
05-09-2008, 07:59 AM
Yes I will agree safer is better, but boosted cars run low 12 a/fs.:mconfused:
talonXracer
05-09-2008, 08:25 AM
I'm confused as to why it would knock in the summer...wouldn't it knock in the winter?

with the SRI you pull in hot air, with an engine at operating temps in the summer this can cause preignition, aka knock. Knock can be caused by several factors,,too lean or too hot of cylinder temps. And with running a 13.7A/F at WOT on NA can cause those cylinder temps to really climb.
clutch797
05-09-2008, 11:43 AM
Well i put in a bit more fuel and this is how my data log sits. I have added 1% to the 13.0 area's and will do a pull and see what happens.
Jpax
05-09-2008, 01:10 PM
Is this the same map you were using when you had your turbo on?
clutch797
05-09-2008, 02:11 PM
No, it's a new map. Papi made the base map and i just street tuned it out.
Jpax
05-09-2008, 05:23 PM
No, it's a new map. Papi made the base map and i just street tuned it out.

check colom 10 please in the high cam map.
clutch797
05-09-2008, 05:36 PM
whats wronge with it? I'm not sure how to tune the cam maps.
Jpax
05-09-2008, 06:21 PM
coloms 9-10 are High load left image is low cam the right is your high cam and your angles seem off. but if that guy tuned your shit. then its problay fine.....

I personally wounld never have the cam angles that low for high load. but ehh. its your car
Jpax
05-09-2008, 06:29 PM
http://img.photobucket.com/albums/v406/jpax/highcamLg.png

http://img.photobucket.com/albums/v406/jpax/locamLg.png

LArger images
clutch797
05-11-2008, 09:01 AM
Papi made the map that i'm running with this setup, all i did was tune the fuel and timing. I have not touched the cam angles.
Slip_Angle
05-11-2008, 10:48 AM
I personally wounld never have the cam angles that low for high load. but ehh. its your car

What is wrong with low cam angles at high loads? When I did my cam angle tuning a couple days ago, the k24a2 really liked 0 cam from 6K up.
Jpax
05-11-2008, 05:03 PM
slip angle do you have aftermarket cams?

usually I see allot of N/A cars have maximum cam advance at the point of high cam engagement, then rolling back down.

So here is a K24A1 map

http://img.photobucket.com/albums/v406/jpax/colom10.png

You can see here column 10 has an appropriate cam advance and then retard.
Slip_Angle
05-11-2008, 09:06 PM
I have the Stock cams.

Columns 7-10 looks like this in my cal. (I added column 7 because Hondata recommended extending to that column as well - So not just 8-10..)

Low Cam
30 Degrees until 3000
15 Degrees at 3500
10 Degrees at 4000 until VTEC

VTEC = 5250

High Cam
20 Degrees at 5250
15 Degrees at 5750
0 Degrees at 6000 - 7500
kon
05-11-2008, 10:13 PM
wow, I've seen 10 degrees at high rpm but never 0. But hey, if it makes power then thats all that counts. What size exhaust are you running? My map is simular but I have the low cam set at 30 all the way through 4000 (vtec) and the high cam going from 40 to 30 to 25 at 7500RPM. I do have K2's though.
Jpax
05-12-2008, 02:14 PM
I have the Stock cams.

Columns 7-10 looks like this in my cal. (I added column 7 because Hondata recommended extending to that column as well - So not just 8-10..)

Low Cam
30 Degrees until 3000
15 Degrees at 3500
10 Degrees at 4000 until VTEC

VTEC = 5250

High Cam
20 Degrees at 5250
15 Degrees at 5750
0 Degrees at 6000 - 7500

yup for your car thats completely fine,

but dont you find it weird that the tuner placed 20 degrees cam angle though out most of the coloum 10 on his map?

Thats what I was talking about. not that you can't build power at 0 degrees because it has.
Slip_Angle
05-12-2008, 08:46 PM
wow, I've seen 10 degrees at high rpm but never 0. But hey, if it makes power then thats all that counts. What size exhaust are you running? My map is simular but I have the low cam set at 30 all the way through 4000 (vtec) and the high cam going from 40 to 30 to 25 at 7500RPM. I do have K2's though.

Exhaust is 2.5 SS custom /w high flow cat. Have you Dyno'd your engine? I haven't yet but once I finish fine tuning I plan to make a trip down to see what kinda power I'm making. Seems very good though. If I lay into the throttle in 2nd gear around 2500 rpm, the tires will begin breaking traction and then spin wildly. That's with 215 Azenis and an LSD. It's very controllable though. I really love the k24a2.


yup for your car thats completely fine,

but dont you find it weird that the tuner placed 20 degrees cam angle though out most of the coloum 10 on his map?

Thats what I was talking about. not that you can't build power at 0 degrees because it has.

The 20 cam on my car made power until almost 5700 and then dropped off rapidly. It does seem strange he uses 20 for most of column 10. The stock Hondata k24a2 map drops it down pretty fast as well..

I bet he would make more power with less cam angle but it's hard to say without measuring.