My Porsche dealer has suggested that I can get another 60hp from installing the Porsche Motorsport's plenum and larger throttle body.

The are familiar with my car ('07 997tt) and know that I have a Ruf 550 upgrade and Europipe L2 exhaust.

At $2200 quoted for parts and whatever the cost of labor, this seems like a pretty inexpensive upgrade for 60hp.

Anyone gone this route? Any comments on this upgrade?

Thanks.

 

Thanks. I guess I should have done a little more research before placing the order with the dealer.

It just sounded so good and it didn't effect the warranty, which for me is one reason to not go with the turbo upgrades...yet.

 

I would be shocked if it gave you 60 crank hp. That would be more than a 10% increase for your car. I did the IPD pleunum with TB myself and got 4-5% average increase across the entire power band. If you look at the power delivery closely you could see that most of the increase came at higher rpms. More details in this thread:
https://www.6speedonline.com/forums/...e-plenium.html

Iam not saying the mod is not worthwhile. It actually is a very good mod. I just dont think its right to lead you to expect a massive gain. It will be a definite but incremental gain that you may need a device like a performance box to see the improvement.

 

The car will be dyno'ed before AND after the work is done and if we don't see close to the claimed difference I will have some serious words with the dealer.

 

I just bought a VBox Performance Box and should have it before the work is done so I will be able to do some comparisons that way as well.

 

my next mod

 

never saw this thing discussed, do those GT3 TB and plenums apply to the 997 gt2?

 

How big is the GT3 throttle body compared to the 77.64 mm Cayenne throttle body?

What are the differences in IPD Plenum 82mm, vs Agency Powers, Size?

 

82mm for the gt3 TB.

 

Have anyone installed any after market plenum/Y pipe/throttle body on a 700sh kit? I would love to do this modd, i just cannot find enough convincing information

 

During our rigorous development of our 750R kit, we found the stock 74mm throttle body to be a significant power restriction and pretty much capped us to 680 crank on safe boost levels.

Once we installed an 82mm throttle body, we were able to leap past the 700 crank hp level on pump gas. To mate this large of a throttle body, we had to create an adapter (commonly referred to as a "plenum" for some reason) and thoroughly rework the software with GIAC.

We then went back and revisited our stock turbo power kits and found that significant power could be unlocked when safely maxxing out the stock turbos with the addition of this throttle body assembly. Special software was required here, too, in order to keep the engine from stalling and to fix off idle throttle response.











Here is the power that our throttle body assembly adds to stock turbos:

 

i think 9ff uses the large TB in their packages above 650hp.

 

We just installed the IPD plenum and enlarged GT3 throttle body on a recent EVT-750 build. On the EVO packages, those parts are the difference between the 700 and 750hp kits.

We built two almost identical cars, both tiptronic cabriolets. One was a complete EVT700 and the other was an EVT750 (plenum and throttle body being the only difference in components). The 750 was noticeably faster.

 

If you could post some pbox times would be very helpful

 

Before you splurge on those components, take some time and call your tuner, Ruf. To get the most bang for the buck, you will need to dyno tune your car with those components...something you probably won't have access to here in the US as the ECU programming for your car occurs in Germany.

You will not see the hp your dealership is claiming with those components. Talk to the folks who did your conversion. Ask them what a recommended upgrade will be as the next step. I am fairly certain I know what they are going to say, and it won't be a plenum/TB.