Boxster article in Excellence Magazine - 986 Forum - The Community for Porsche Boxster & Cayman Owners

mts · 02-19-2010, 04:21 PM

There is a nice write up about Bill Diaz's 2.5->3.4 conversion in the April 2010 issue. Not sure if Bill is on the forum, but if so, congrats on the article!

NWI Bill · 02-20-2010, 05:41 PM

I liked the article too, so much so, I've read it over again. Some great ideas for both power increases and some nice interior tweaks.

eclou · 02-21-2010, 05:38 PM

I don't understand why he chose to maintain the stock 3" MAF from the 2.5l?

NWI Bill · 02-21-2010, 05:45 PM

I thought the article said he changed it to 3.5" and a new intake box after the initial dyno didn't yeild the results he hoped and determined the stock intake was the issue. Didn't he install a IPD plenum and an overbored TB? I may be confusing it with another conversion I read about in another publication.

VRsyncro · 02-21-2010, 08:04 PM

Quote:

Originally Posted by eclou

I don't understand why he chose to maintain the stock 3" MAF from the 2.5l?

That's what I thought as well??

On my conversion I right away swapped to the stock 3.5" MAF Housing from a 3.4L engine. I had to remove the airbox and go with a cone filter but I wanted as close to stock setup for the 3.4L as possible.

I'd have to read the article again, but some of the stuff described in the conversion just didn't make sense???

eclou · 02-22-2010, 06:08 AM

Quote:

Originally Posted by VRsyncro

I'd have to read the article again, but some of the stuff described in the conversion just didn't make sense???

Exactly. 2 big questions marks for me:

1)upgrading the exhaust headers and piping but retaining the stock cats and muffler = probably net gain of zero

2)upgrading plenum, intake but retaining smaller MAF = probably net gain of zero.

The car should not need a piggyback signal massage device like the Apexi if it were setup correctly.

jhandy · 02-22-2010, 07:20 AM

i have a nieve question.

When they are doing these conversions, do they not take the entire setup and transplant it?

take the motor, intake, headers, wireing harness, DME and transplant the entire system so that there are no issues with fittement.

Adam · 02-22-2010, 12:30 PM

Quote:

Originally Posted by eclou

Exactly. 2 big questions marks for me:

1)upgrading the exhaust headers and piping but retaining the stock cats and muffler = probably net gain of zero

Perhaps he retained the stock cats because he needs it to pass emissions. And he used a factory muffler because he didn't want something real loud. He probably only swapped out the headers because the exhaust ports on the 3.4L heads are too big for 2.5L manifolds and the bolt locations may be different as well. Is that right Jaay?