My M30B35 turbo timing table. Look OK?

Discussion pertaining to positive pressure E28s.
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BONDOSPECIAL
Posts: 164
Joined: Jul 23, 2018 10:50 AM
Location: Killingworth, Connecticut, USA

My M30B35 turbo timing table. Look OK?

Post by BONDOSPECIAL »

Hi guys. I am self tuning my 9:1 compression forged piston/ MLS head gasket/ head studs M30B35 which has a T04E turbo controlled to 16 psi right now. This timing table is an amalgamation of a couple tables from similar builds. This is a 5 speed manual e23 with 3.06 gears.

Does anyone who has an M30 running around my boost level have any opinions if anything looks out of whack? Is it normal for the timing under high boost to have that dip in it in the 3500-4500 range? I did not configure those #s, a friend did that. Also does the amount of timing in the 17 psi row look normal? I saw someone with an M30 running 20 degrees of timing and someone running less timing than I am, so I have no idea what is normal for a combo like this. I know it would be nice to have knock sensing so I could make tweaks and log it and look for knock counts, but I don't have that.

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Thanks
Steve
marc79euro645
Posts: 513
Joined: Dec 08, 2008 11:33 PM

Re: My M30B35 turbo timing table. Look OK?

Post by marc79euro645 »

What octane fuel are you using?
Are you using an intercooler?
BONDOSPECIAL
Posts: 164
Joined: Jul 23, 2018 10:50 AM
Location: Killingworth, Connecticut, USA

Re: My M30B35 turbo timing table. Look OK?

Post by BONDOSPECIAL »

93 octane, and yes Cartech w2A intercooler
M. Holtmeier
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Joined: Mar 11, 2007 3:06 AM
Location: Dallas, Texas

Re: My M30B35 turbo timing table. Look OK?

Post by M. Holtmeier »

What exhaust manifold are you using? Stock B35 camshaft?
BONDOSPECIAL
Posts: 164
Joined: Jul 23, 2018 10:50 AM
Location: Killingworth, Connecticut, USA

Re: My M30B35 turbo timing table. Look OK?

Post by BONDOSPECIAL »

TCD log manifold, m30b35 new stock cam
M. Holtmeier
Posts: 3025
Joined: Mar 11, 2007 3:06 AM
Location: Dallas, Texas

Re: My M30B35 turbo timing table. Look OK?

Post by M. Holtmeier »

BONDOSPECIAL wrote: Aug 26, 2022 7:21 PM TCD log manifold, m30b35 new stock cam
I would stick with the table you posted until you can tune on a dyno.
marc79euro645
Posts: 513
Joined: Dec 08, 2008 11:33 PM

Re: My M30B35 turbo timing table. Look OK?

Post by marc79euro645 »

Here's mine. I'm tuning with a knocksense light that blinds me when it detects knock. I'm using 91 octane non ethanol gas, with an a/a intercooler and 8.5 to1 compression. That said I've still managed to pop head gaskets ,with k/s light going off under hard accel, in mid range. Acceleration enrichments may be able to solve this, or I'll pull more timing in 2500-3500 range.
Your timing looks scary to me, but I could be wrong.


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turbodan
Posts: 9170
Joined: Jan 09, 2007 10:19 PM

Re: My M30B35 turbo timing table. Look OK?

Post by turbodan »

With timing under boost you don't need to pull much at all initially but it will need to fall off steeply toward the top of the map. Should not be a linear ramp down as soon as you cross over into boost. Once you have determined the appropriate amount of timing at full boost to avoid det in the meat of the power you can work on the boost/retard ramp and try feeding some advance back in on either side of peak torque.
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