200whp with stock N/A rotating assy?

[LJ851]

Ooooooh, can't wait !

[tinkerputzer]

That sounds sick! Cannot wait to see how it does.

Post pics of the exhaust work if you can.

[digger]

This. Thing. Sounds. Amazing.

Went with dual 2" exhaust, x pipe ~34" from collectors, twin 12" resonators.

10am appointment at dyno.

This one is staying Alpha-N Motronic 1.3.

that's what i just did with my exhaust but 2.25" and cats, makes alot more bottom end and midrange now

awaits eagerly for results:)

[ForcedFirebird]

More hooning.

https://www.youtube.com/watch?v=AW2MiGT-0L0

[ForcedFirebird]

That sounds sick! Cannot wait to see how it does.

Post pics of the exhaust work if you can.

Simple, effective and serviceable. The X-pipe that came with the headers are something to be desired. :(

[dirtie30]

That's cool that Alpha-N tuning works with 1.3...

How do you work around not having a real TPS? From my cursory searches the factory TPS only signals WOT, is this incorrect?

Since these ECUs aren't wideband, won't there be lean issues once you start going up in elevation? Since you guys are in flat Florida, I can't see this being an issue since there is practically no elevation change.

I may just have to dump my ECU and sift through it a bit... hmmmm

[squidmaster]

Good stuff, John! My speakers were up all of the way (my ears hurt now)

[LJ851]

What did the dyno say?

[dirtie30]

What did the dyno say?

X2.

I'm interested in how it made out with Alpha-N tuning on 1.3.

I never gave this DME a second thought, my next step was to toss in pnp MSII. But if I am able to tune this DME via Alpha-N I may just play with it a little before I throw it out.
:wgaf: I can tune ME7.x, but I am not familiar with anything earlier lol / :ot:

[ForcedFirebird]

Didn't get a good pull. Fouled the plugs during tuning, so we attempted to tune another customers' 944t, but his ECU installer botched the wiring. Wasted a few hours of dyno rental with no results on either car. Got another appt later today.

[dirtie30]

Looking forward to the results.

[tinkerputzer]

Simple, effective and serviceable. The X-pipe that came with the headers are something to be desired. :(

Looks quite functional to me.

x pipe ~34" from collectors

Is this dimension from where the primaries end/secondary begins to where the x pipe merges? Just wondering how precise the measurement has to be.

[dirtie30]

So what happened? How's Alpha-N tuning going for you guys?

[ForcedFirebird]

We were trying to sneak between appts on dyno, as the owner is a friend of mine, but they all ran over their slot on Friday, so we just used the time to iron out the M1.3 Alpha-N, and ended up giving up. Int the M1.3 code, Bosch used a transfer function map to save valuable space on he 256k chip and dies to the nature of the formula, airflow could not be transferred to a linear table. One might be able to get it to work, but it will never be street-able. Since there is an exponent in the formula, the final air flow calculation can never be linear (as the TPS is putting out that replaced the AFM).

Standalone will be at the shop tomorrow afternoon, and it will be tuned with a P&P MS from Whodwho (Keith).

We kept fouling plugs trying to get the M1.3 to behave, but it simply wasn't working. Just pulling the car from trailer to the dyno on the stock ECU with a free-rev tune fouled the plugs. Changed them, got it to pull a couple times, but could never get over 135whp, and after each run, there was a dead cylinder from a fouled plug - laser thermo on header primaries was always showing the dropped cyl at 120 degrees, the rest were in the upper 200's when the dyno brake stopped the wheels. We would change the plugs, then it would happen again and not always on the same cylinder, and at times it dropped 2 after a pull. I went out of town for the weekend for a planned family visit, just ran out of time.

If one had a LOT of time to change plugs and change the AFM transfer function multipliers in the Motronic, you MAY be able to get it to behave, but then it would still be finicky. When you tune the part or wide open throttle, the other suffers. Idle was never good, even putting the stock throttle switch on it to revert back to idle maps since the AFM tranfer is still calculated in.

I know this may as well be Chinese to some, but trust me, it's nearly impossible compared to the Motronic 3.x (413 and 506 ECU's) we were able to run in Alpha-N. If one was to start with an M50 Vanos harness and M3.x ECU on the M20 with ITB's, I feel it would be a better starting point.

[LJ851]

Interesting. I will be looking forward to seeing the Alpha-n map quality and driveability of a standalone vs what you were able to achieve with the Motronic 3.x ECU.