2.7 swap

[ike84]

Originally Posted by truegearhead

Thanks for reaching out over IM. As you know I put a 2.7l in my 2.5l car. You need to use the 2.7 intake manifold, and the 2.5l crossover and throttle body and the 2.5l wiring harness. The vacuum port for the second cross over can just be blocked. I used the factory 2.5l ecu. It dyno’ed at more power to the wheels then a 2.7 is supposed to make at the crank and ran great. If you need anymore help let me know, happy to help

Edit: I also used fuel rail and return system from the 2.5

I find this fascinating - any idea where the power came from? Did you get any afr readings? Maybe it was running lean and that's where the power came from? Maybe the resonance flapper is actually a handicap (the idea, while I understand the intended purpose, just seems absolutely ridiculous) and deleting it provided a smoother intake flow?

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[JFP in PA]

Originally Posted by ike84

I find this fascinating - any idea where the power came from? Did you get any afr readings? Maybe it was running lean and that's where the power came from? Maybe the resonance flapper is actually a handicap (the idea, while I understand the intended purpose, just seems absolutely ridiculous) and deleting it provided a smoother intake flow?

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You need to read up on Helmholtz resonance technology before call that device a handicap.....................

[ike84]

Originally Posted by JFP in PA

You need to read up on Helmholtz resonance technology before call that device a handicap.....................

I'm not sure I understand what you mean - Helmholtz resonance refers to dynamic resonance inside of a closed container with a single point of entry.

I understand the purpose of the valve - it is porsche's version of a variable length intake that utilizes in the concept of longer length results in smoother flow which increases velocity into the valves for enhancement of midrange torque, and but utilizing shorter intakes at low rpms and high rpm in order to decrease overall resistance of the system.

My use of the term handicap simply is a reflection of my doubt about the system's ability to accomplish this task. There would need to be a standing wave whose frequency rises in correspondence with the motor rpm or else the system could actually work in reverse and be pushing air away from the open valves. This would be exceptionally difficult to accomplish since we're talking frequency in the 100hz range. Anything other than perfect synchrony would hurt performance. Hence...handicap.

You seem to be one of the most experienced people in the forum in regards to the form and function of these machines. What do you think about the increased torque output of running a 2.7l on a 2.5l tune without a resonance flapper?



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[truegearhead]

Originally Posted by ike84

I find this fascinating - any idea where the power came from? Did you get any afr readings? Maybe it was running lean and that's where the power came from? Maybe the resonance flapper is actually a handicap (the idea, while I understand the intended purpose, just seems absolutely ridiculous) and deleting it provided a smoother intake flow?

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We did check AFR during the dyno run, if I could find the damn graph the AFR readings are plotted on the same graph as the power curve. I was completely surprised by the addition HP, I was only swapping the 2.7 in because my 2.5 blew up (failed accusump) and I had a cheap line on a 2.7.

[Dllrd23]

Progress today: Had high hopes of getting a lot done on the 2.7 as my first Pelican shipment has arrived. Water Pump, T-stat, 4 camshaft seals, Pelican "good-as-new" IMS bearing, tensioner o-rings and seals, and new AOS. I fabricated some camshaft holders out of a piece of stock and they worked better than expected. Pulled the tensioners and nothing moved. Went to use my homemade IMS bearing puller and discovered that the threaded shaft on the center blank was smaller that that on the 1999 2.5l boxster that I made the tool for. you can see video of the tool and the results from the 2.5 here: https://youtu.be/3WvianmKEAg Anyway, I'm going to have to make some corrections to the tool tomorrow at work and then hopefully pull and install the bearing tomorrow. I videoed the whole thing and will be posting to You Tube as well as pics/Narrative here. If you want to follow progress, please subscribe to the channel associated to the link above or check back here for updates. I'm really enjoying this project and excited to share with anyone interested. Again, thanks for following and I hope to have some pics up this week.