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-   -   Installing a 2.7l engine in a Boxster S of the same year... (http://986forum.com/forums/performance-technical-chat/82551-installing-2-7l-engine-boxster-s-same-year.html)

elgyqc 09-17-2022 11:07 AM

Installing a 2.7l engine in a Boxster S of the same year...
 
If all goes well I will be buying a 2000 Boxster S with an engine problem. I have a spare 2.7 engine, also from a 2000, that I plan on installing, as long as there are no major complications. I see the 2.7 engine as a temporary solution, I want to test the 2.7 engine anyway. Once the 3.2 is out I can have a look at it to see if it can be repaired. Supposedly it has a failed IMS bearing, based on the fact that there is metal in the oil filter. If the 3.2 engine can be repaired it will go back into the car. If not I will sell off any useful parts and put them towards buying a used 3.2.
According to the article in the 101 projects book and on the Pelican site the 2.7 should be compatible, but a re-map of the DME would be needed. I assume that the transmission would bolt right on. Would the clutch be a problem? I will have both the 2.7 and 3.2 clutches available.
Also, what exactly is involved in remapping the DME?
Any help appreciated, thanks in advance.

ike84 09-19-2022 05:19 PM

You actually will not need to remap the dme, so long as you keep the maf housing the same. The dme cares not the displacement, it just needs accurate measurements of air coming in, so that it can deliver the proper amt of fuel and then have it check out on the exhaust size. If you change your maf housing, however, you will need a new map. PIWIS II is what you'll need - I wrote up a diy on flashing procedure a few years ago.

I don't think that the 6 speed bolts to the 2.7. Someone check me on that, but I'm pretty sure the patterns are different.

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elgyqc 09-20-2022 02:42 AM

Quote:

Originally Posted by ike84 (Post 648771)
You actually will not need to remap the dme, so long as you keep the maf housing the same. The dme cares not the displacement, it just needs accurate measurements of air coming in, so that it can deliver the proper amt of fuel and then have it check out on the exhaust size. If you change your maf housing, however, you will need a new map. PIWIS II is what you'll need - I wrote up a diy on flashing procedure a few years ago.

I don't think that the 6 speed bolts to the 2.7. Someone check me on that, but I'm pretty sure the patterns are different.

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Thanks, good to know that the remap is not necessary. I did some searching and can't find any suggestions that the bolt patterns differ.

78F350 09-20-2022 04:03 PM

One of the cars I bought was a 2000 S with a 2.5L (1997) installed with the 6-speed transmission. No issues with bolt pattern.

ike84 09-22-2022 07:27 PM

I seem to remember that from a 6 speed conversion thread. I could definitely be wrong though.

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Quadcammer 09-23-2022 04:30 AM

Quote:

Originally Posted by ike84 (Post 648771)
You actually will not need to remap the dme, so long as you keep the maf housing the same. The dme cares not the displacement, it just needs accurate measurements of air coming in, so that it can deliver the proper amt of fuel and then have it check out on the exhaust size. If you change your maf housing, however, you will need a new map. PIWIS II is what you'll need - I wrote up a diy on flashing procedure a few years ago.

I don't think that the 6 speed bolts to the 2.7. Someone check me on that, but I'm pretty sure the patterns are different.

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Not necessarily true. The dme can adjust only so much to remove fuel to get the smaller motor to a reasonable a/f, so you may hit correction limits

ike84 09-28-2022 09:22 PM

Quote:

Originally Posted by Quadcammer (Post 648865)
Not necessarily true. The dme can adjust only so much to remove fuel to get the smaller motor to a reasonable a/f, so you may hit correction limits

I have read the same thing about the correction limits, and I've seen both 20% and 25%.

My 2.7 runs on a 3.4L tune at-17% long term fuel trim without issue and afr is spot on.

I would assume that if all other components are left stock (intake and exhaust), a 2.7 would run around -15% on a 3.2 tune.

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subieworx 10-04-2022 04:34 AM

It's only going to be spot on when cruising though in closed loop fueling. Once it enters open loop fueling it will ignore the oxygen sensor for the most part and run programmed values. The primary oxygen sensor is not a wideband sensor and is not used for full time close loop control as I understand it in this car.

elgyqc 10-04-2022 05:47 AM

Thanks for the remarks... even though I don't really understand what all that means. What I take away from this is that the car will run well enough to test out the car and the engine, but will not be at its most efficient.

elgyqc 10-11-2022 04:15 AM

The 3.2 engine and 6 speed transmission are now out of the car. When installing the 2.7 I am assuming that I can use the original 2,7 flywheel with the 3.2 clutch disk and pressure plate. Any other parts that must be switched?
The other difference I see is the backup light switch wiring. If I remember correctly on my base boxster the connector is different and I don't see the wire on my 2.7 engine so I suspect that it goes to the cars wiring harness not the engine's.

ike84 10-14-2022 07:40 PM

Quote:

Originally Posted by subieworx (Post 649013)
It's only going to be spot on when cruising though in closed loop fueling. Once it enters open loop fueling it will ignore the oxygen sensor for the most part and run programmed values. The primary oxygen sensor is not a wideband sensor and is not used for full time close loop control as I understand it in this car.

This is not correct. This is the entire point of ltft adaptations. My afr at wot is 10.5-12 depending on load and slope.

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Quadcammer 10-17-2022 06:56 AM

Quote:

Originally Posted by ike84 (Post 649141)
This is not correct. This is the entire point of ltft adaptations. My afr at wot is 10.5-12 depending on load and slope.

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thats insanely rich. You'd want to see closer to 12.8. 10.5 is like pig rich. Power would be down a lot.

blue62 10-17-2022 09:21 AM

Quote:

Originally Posted by ike84 (Post 649141)
This is not correct. This is the entire point of ltft adaptations. My afr at wot is 10.5-12 depending on load and slope.

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How your you arriving at your "AFR" figures?
AFR gauges?.... Dyno runs?

elgyqc 10-22-2022 06:07 PM

The 2.7l engine is ready to go into the car. Engine 2.7l, 6 speed gearbox and flywheel, clutch and pressure plate from a 3.2l. As others suggested there is no problem with the bolt pattern.

http://986forum.com/forums/uploads02...1666490795.jpg

ike84 10-30-2022 11:11 AM

Quote:

Originally Posted by elgyqc (Post 649274)
The 2.7l engine is ready to go into the car. Engine 2.7l, 6 speed gearbox and flywheel, clutch and pressure plate from a 3.2l. As others suggested there is no problem with the bolt pattern.



http://986forum.com/forums/uploads02...1666490795.jpg

Nice work!

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ike84 10-30-2022 11:12 AM

Quote:

Originally Posted by blue62 (Post 649184)
How your you arriving at your "AFR" figures?

AFR gauges?.... Dyno runs?

Yes, i have an afr guage installed.

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elgyqc 11-03-2022 09:10 AM

The engine is in the car and it runs, although it is a bit rough. I am assuming that it will take awhile for the ECU to come to grips with the engine change. The more I drive it the better it runs.
So the answer to my original question is: yes the 2.7l engine can be installed without major problems. If the ECU is able to adapt to the engine the only other (minor) incompatibility is the backup light connection.
I will continue to update my experience on the thread for the car at:
http://986forum.com/forums/boxster-general-discussions/82558-bought-2000-boxster-s-project.html#post649383

ike84 11-04-2022 05:31 PM

Some tips at this point...

Let it even out the idle before you drive. It will take 60 seconds or so to adapt. This is important though because it tunes the base of your ltfts.

When driving, go easy so that it stays in closed loop operations. This will fine tune your ltfts over about 50 miles of driving so that the dme can adjust to new maps. Don't push it into open loop until after your ltfts have settled out (somewhere around -15%).

You really shouldn't have any rough running as you're gonna be rich if anything. If you haven't already, clean your MAF sensor really well.

Btw, job well done [emoji106]

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