rigidbigelsworth

iTrader: (3)

Went for my first drive on brains base maps and above 4k rpm it sputters and backfires and won't accelerate any above 4000 rpm. Rev limit is 7100. Overboost set to 10psi. Will add video shortly. Also I noticed the center led is lit up on my ms now and it never used to.

edit: wont let me upload iphone video but what do i need to log/take screenshot of to be of any benefit to yall?

Braineack

iTrader: (62)

(Posting from my phone.)

Log.

pdexta

iTrader: (17)

Like Brain says, datalog and see what's going on that's going to tell you more than any video or picture ever could.

As for the problem, my guesses...

1. Overboost is coming on. Do you have a boost gauge? What is it showing? If it's near 10psi, that's likely your problem

2. Air/Fuel Ratio is overly rich or lean. What is your wideband reading at idle? Under acceleration? Have you adjusted the fuel map at all?

3. Spark Blowout. What are your spark plugs gapped at? Did you go 1 range cooler on the plugs? If the first 2 have been fixed, pull the plugs and decrease the gap.

I've had similar problems to what you describe under all 3 circumstances. When I loaded the basemap on both my cars it was WAYYY off. Unless you're just plain lucky, you've got a good deal of tuning ahead of you.

rigidbigelsworth

iTrader: (3)

I'll have to get a log up tomorrow

As far as your questions pdexta
1: max psi is around 7 as I have my wastegate set, gauge confirms it
2: idle is around 11 for the most part under hard acceleration it's around 13.5
3: still have stock plugs. What kind of gap should I be aiming for? And what does ' one plug cooler' mean?

Thanks for the quick response

Full_Tilt_Boogie

iTrader: (1)

Needs more fuel in boost, you are detonating.

Are you sure the right basemap is on there? Typically a basemap would be overly rich, not lean.

rigidbigelsworth

iTrader: (3)

here are my fuel map, spark map, and req fuel value

on the req fuel calculator, it asks for AFR, it is listed as 14.7 should i lower that to like 12 or 13?

Jeff_Ciesielski

iTrader: (10)

No. Req_Fuel is simply used to scale the fuel table values when calculating injector pulsewidth. You simply need more fuel (higher values) in your VE table under load, and less around idle.

You are either
1. Detonating due to a lean condition. You seriously need more fuel under load. Idle should be 15:1 - 14.5:1 and under boost you should be 12:1-11.5:1 at those boost levels. You adjust these by raising and lowering the values in the VE table NOT the target AFR table (seen this a few times)
or
2. You have spark blowout due to incorrectly gapped plugs. Try lowering your gap to .022-.025 IN ADDITION TO adding more fuel.

Cooler plugs refers to how much heat the spark plug dissipates into the head. Hotter plugs dissipate less than cooler plugs. Hotter plugs tend to run cleaner (not foul as often) but as they are a source of heat in the combustion chamber, then can cause detonation in an already lean mixture or under high load/pressure. I can't remember the plug numbers right now since I haven't bought any in a while, but perhaps someone else can chime in with that.

Good rule of thumb is 1 step colder plug for every additional 100whp btw.

rigidbigelsworth

iTrader: (3)

So instead of a like 16 plug go with like 17?or 18?

What's a reasonable step to bump my fuel table by?

ScottFW

iTrader: (4)

Stock plugs are NGK BKR5E, you want BKR7E. If your FLAPS doesn't carry them, you can get a set on ebay for $10-12 delivered.

rigidbigelsworth

iTrader: (3)

Can y'all tell from looking at my fuel map if I'm starving for gas in boost? They are just a bunch of numbers to me haha

I'll have to start tuning my fuel map tomorrow. Whats a reasonable step size to adjust my fuel values by? 1?5?10?

Thanks for the suggestions

FRT_Fun

iTrader: (19)

Yes you need more fuel under boost. And less fuel at idle. You are going to blow your **** up.

Braineack

iTrader: (62)

still waiting for the log file...

Vashthestampede

iTrader: (17)

I was having a similar issue at one point in time and it was my spark plugs.

Like ScottFW said, BKR7E and gap them accordingly.

rigidbigelsworth

iTrader: (3)

Brain you just want one if those tooth logs?

Techsalvager

in tunerstudio at the top
Datalogging > start
save log file, drive around
datalogging > stop

then upload file and tune to here

Braineack

iTrader: (62)

* drive around and make event occur.

rigidbigelsworth

iTrader: (3)

im kinda hesitant to log while purposely hitting a spot that is potentially detonation...
also when looking at my table vs a table brain posted, i have more fuel at high rpm/high boost, and less at low rpm/low boost already...

as far as i know brain is on similar fueling system, stock fuel pump, 460's
am i missing something?

my map is on the left, one brain posted in another thread is on the right

Braineack

iTrader: (62)

I mean it's possibly you're getting way too rich but the looks of that fuel map. You're adding 20% more fuel within 3psi of boost. But I wouldn't know without seeing a log. Then i can see what the MS is acutally doing and what your inputs (wbo2) are looking like.

Jeff_Ciesielski

iTrader: (10)

Fuel maps mean absolutely ****. Post a log.

rigidbigelsworth

iTrader: (3)

alright ill go log a run. fingers crossed my engine doesnt blow up :/