14b AFC Tuning 440s 2g mas...

[Jhoe]

Ive been searching for how to tune a 14b but cant seem to find it, all I get is people with bigger turbos.
I got a stock 14b ported, 2g o2/exhuast mani ported, 2g mas, AFC stock 440s. A/f, boost, egt.

What would be some good settings to start off with? My datalogger is on the way to do some serious tuning but I dont wanna set it somewhere, make a pull, and discover that I made the settings perfect for grenading my engine.

Thanks

 

[snake679]

i am running pretty much the same setup.....i could use some opinions as well

 

[HighPSI TSi Guy]

don't touch anything till you get the logger.. once you get the logger leave low throttle alone... tune the high throttle by leanign things out till it knocks then adding fuel back where it knocks...

EDIT: just noticed you are a 1G w/ a 2G MAS... start out with everything richened up approx. 20%... then go from there with what i already said

 

[COspeed]

I'm about to switch to the 2g Mas in my 1g. I have a walbro 190 and an upgraded fuel line and fuel rail inlet. Any ideas for base afc settings would be appreciated. I've heard anywhere from 15-25% richer is a good place to start. Also, is it necessary to tune for 0 knock? I thought a couple counts of knock were fine if timing isn't affected...

 

[snake679]

I run the same setup, and i went +10 across the board, that is a good starting point and will compensate for the 2G MAS. Start from there, and then you can make changes...

 

[kpt4321]

First of all, your stock injectors are 450 cc/min, not 440.

Second of all, all the basic techniques used with bigger turbos still apply, you just have to tweak things a bit. Since you have a lower boost limitation due to the smaller turbo, and possibly a higher charge temperature due to less efficiency, you will need to compensate by other means.

This also is VERY different if you are tuning for good times at the track on race gas, or on pump gas. Which is it?

When you put the 2g MAF in, you probably want to go about +20% across the board. But, just use the logger and the fuel trims to figure it out, it's the only way to fly.

My car has done 102 mph and 108 mph (pump gas and race gas, respectively) with a 14b, 450's, and NO FUEL CONTROL whatsoever. The potential is there, you just need to harness it.

...Kyle T.
93 TSi AWD "TURBO4"
14b - 12.8 @ 108

 

[Jhoe]

Im tuning for pump gas (93 octane) and for the street. I had +20 across the board so i started leaning it out...but now I'm getting about the same knock it seems. And if Im correct (Im probably not) its running rich, 4843 rpm with 41 knock! Timing was at 6 deg, O2 was at .86 volts, from my understanding that is rich right? airflow was at 1360hz, but injector pulse im still not familiar with, but they are at 15.83 ms, and I think that is maxed out right? air temp was 100deg and throttle was only 72%. but at 5340 rpm, knock went down to 39 and timing went to 13 deg, im guessing timing was adjusted to reduce knock? Am I just running too much boost? (~16-17lbs), freshly rebuilt, ported 14b, ported 2g o2 and ex. mani. Am I heat soaking the intercooler or what?...Im real new to this but tryin...
Any suggestions??

Thanks

 

[HighPSI TSi Guy]

tune at a lower boost level to start with them move up

 

[BlkAWD]

.86v is to lean for a 1g. On my car and similar 1gs in my area really like .92v - .94v (91 octane). 41 counts of knock is outrageous therefore your timing is at 6 degrees. Tune for anything under 7 counts of knock, anything over that a timing starts to retard. I can honestly tell you that you will never rid the knock on 450s. I have a b16g and BR fmic, 550cc and upgrade -6an fuel line, my afc is at +26. So adjust accordingly.

 

[kpt4321]

Turn the boost down to like 12 or 13 psi, and tune it there. Then, start bringing it back up.

If it's knocking, then it's too lean, and you need more fuel.

15 ms isn't even close to maxed out, you're definately not getting enough fuel.


....Kyle T.

 

[Jhoe]

I dont understand how Im not getting enough fuel then, if I was at +20 and hitting fuel cut. The Injector width x Rpm / 1200 = duty cycle, I havent passed over 58% yet, how am I hitting fuel cut? and how am I not gettin enough fuel?...I got a walbro 255lp pump too....

 

[kpt4321]

What is your IPW?

Turn the boost down to the lowest it will go, and tune there. If it's still knocking, we have some bigger issues to resolve.

...Kyle T.

 

[NDgsx]

Originally posted by BlkAWD
.86v is to lean for a 1g. On my car and similar 1gs in my area really like .92v - .94v (91 octane).
I can honestly tell you that you will never rid the knock on 450s. I have a b16g and BR fmic, 550cc and upgrade -6an fuel line, my afc is at +26. So adjust accordingly.

1. o2 values off a 1.0v sensor with no temp correction are completely useless. Don't tune for an o2 value, go by knock counts. Don't compare o2 values between cars, there's way to many variations.

2. Really it's impossible on a 14b huh? Guess what my car is running 15psi of boost, 14b smic, 450s, 0 counts of knock. I can run 17psi w/o knocking, but there's no real point to running that boost on a 14b because it's just blowing hot air at that point.
With a 16g you DO need larger injectors, but not with a 14b.

You also have to know the IPW at a rpm point to know the duty cycle. Most people list their IPW at 7k normally. The new palm logger software will let you log the IDC to make things easier.