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Old 12-31-2020, 06:47 AM   #1
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Join Date: Aug 2016
Posts: 169
Boxster S M96/21 overbore to 3.6/3.8 with stock DME?

I have a 2002 Boxster S 3.2

Lost power in an autocross run, turns out the engine is now a rebuildable core (cracked head or d chunk, tear down pending, still ran, no expensive noises but all the coolant ended up in the crankcase)

Planning to have LN engineering bore the case halves to 3.6 or 3.8 and rebuild. I realize a used engine would be cheaper, but I really like doing engine work, especially with high performance parts.

My question is as follows:

Is it safe to run a 3.6 or 3.8 M96/21 with the stock Boxster S DME?

I don’t want to run my expensive new engine lean and fry it. I don’t care that much if the stock tune isn’t optimal, worried more if it is safe to run like that. I am sure I will eventually upgrade the tune, but would like to run with the stock tune until I can get to a shop with the skills to do it right.

Follow up question:

who has the skills to tune my DME?

I don’t want to swap to a newer DME if avoidable, would rather have my current one flashed. If I have to do it now to make it safe I will, but would prefer to wait if I can.

Leaning toward the 3.8 for the extra torque, I realize the 3.2 heads really don’t flow enough for that displacement, but that actually enhances low end torque, which would be great for autocross! if there is a compelling reason to go 3.6 I’d love to hear it.

Thanks for any assistance you can offer!

Silber

Last edited by Silber; 12-31-2020 at 07:25 AM.
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