MyE28.com DEV

I'm looking to compare my tables with somebody elses. I was looking over Brad D.'s but isint his an m30b35? Are the ignition needs relatively the same for the 2 motors?

He'll run more ignition advance with different compression and higher octane fuel.

My compression ratio is still around the stock 8:1 after shaving a tiny bit off the block and head and boring the block out. I'm using 93 octane, pretty sure it contains about 15% ethanol. Intercooled turbo at 11psi.

Anybody's setup similar to that?

It's about the same.

There's mine, conservative safe tune for 93.
Haven't tuned fuel past 13psi because of slippage.

Well, I was hoping that a different tune was going to take care of my bucking but it seems all it did was take down some of my power. I guess ill just put it back the way it was and get back in touch with Peter F. and see what he thinks.

Thanks Shadow.

jim325 wrote:Well, I was hoping that a different tune was going to take care of my bucking but it seems all it did was take down some of my power. I guess ill just put it back the way it was and get back in touch with Peter F. and see what he thinks.

Thanks Shadow.

Post your MSQ and a good datalog, and describe what your car is. You have given us little to no information on your car and your problem. We can't help you fix a problem if we don't fully understand what it is. Where is it "bucking", does temperature affect it, is it happening at a certain RPM or load? A lean mixture is generally the first culprit, the second I found is running too much timing. I had a very agressive low rpm section of my map and it made the car unsmooth, by reducing the timing it has made it feel much smoother. Go into more detail with what you have going on, and either myself or other forum members will actually be able to help you. Which code you are running is important as well, are you running ms2/3? Somebody elses code would not be as relevant if they are running a much different code variant than you, recently they have been making some decent sized changes.

In my experience, bucking is usually a fueling/timing issue in the bottom row or two rows. One thing I found: don't let VEanalyze tune those rows for fuel, it'll get it wrong every time. Tune that first row or two rows manually, then let VEanalyze Live do its thing with the rest.

Pull lots of timing below 35-40 kpa at low rpm. Set your fuel cut somewhere below 30 kpa. Its possibly a fuel mixture issue but not as likely as ignition.

Heres one of mine:


It switches to another table under 50 kpa. You always want to tune down below your minimum kpa and rpm. If your ingition map ends at 30 kpa you're leaving a lot on the table.

The most common reason I've found TPS not showing movement when throttle first opens. I would recalibrate the TPS and make sure it shows movement as soon as throttle moves.
I can email you a M30b34 map but it uses Paul's cam so it's a little bit different.