Hi guys

I have 2007 997 tt and i dont feel that the engine give me the whole power i got only 0.8 - 0.9 bar i saw 1.0 only once ! Btw My car is stock and i think that the stock 997 tt most reach 1.2 bar

Any one can help / advice to increase the bar

 

When i was stock that is the same as what i saw without sport mode. Sport mode would consistently boost 1.0-1.1.

Do you have sport chrono?
Are you actually driving correctly to activate overboost?

 

I got 0.9 only with sport mode !

 

Sounds like you have an issue. Either sticking actuator rod(s), or boost leak somewhere. I would take it in and have it checked....With sport mode, you should be spiking to 1.2 bar (~17.5 psi).

Assume you know this? But you have to quickly mash the gas pedal to the floor and you will see a small up arrow next to the boost gauge on the dash. That is how you can tell you have activated overboost.

Either way, you should see 1 bar (!14.5 psi) without sport mode. It will likely not stay there, but should spike there.

DC

 

Great info! I never knew this

 

It doesn't accidentally go into overboost...you have to ask it

 

Great advice from members above. Highly suggest getting a means to datalogging your car. Durametric is one way of logging it cheap but it can drop connections and it isn't really great. It also requires a laptop connected in the car while logging. Another way is to run a boost gauge to a vacuum line going to your diverter valves on either one of the turbos and looking at the gauge in the car. Last but certainly not least and highly recommended is to get a Cobb Accessport. You get full datalogging functionality, diagnostics and ability to work with a protuner to custom tailor a tune for your car/modifications/octane needs.

Dzenno@PTF

 

A thorough datalog and professional evaluation of said data is probably a good call.

 

Hi Guys,

This is a new to me car. 2007 997.1 Turbo with a mild Switzer ECU tune to 600HP on 93 octane. The car was in the stereoscope and when I picked it up it seemed like it has been neutered. Only makes 15# of boost instead of 20. It's been in the shop for 10 days for Leak Tests, valve tests, CAM tests, etc.. All good. No codes. We did replace the MAF sensors... After speaking to Tym at Switzer, he thinks for some reason the ECU is limiting the boost to 1bar or 15#. I explained all the tests we have done and he said it COULD be bad gas. If the ECU sees any pinging or detonation, it will not allow full boost. When I picked the car up form the stereo shop it was out of almost out gas. I have since filled it up and ran thru that tank (93) and it still throttling itself at 15#. So, my question is, "what else would the ECU see that would make it hold back boost"? Thanks much... -Dan

 

Dan, I also have a 2007 model 997tt and had a custom tune by Keven at UMW which made the car run like it was designed. To begin I purchased the data logger from UMW and logged a couple pulls with the best gas i could find locally which is 91 octane without ethanol. the timing retard under WOT pulls was in the minus 8-11 degree ranges and the boost was never above .9 bar. After emailing the logs to Keven we decided the gas was just not going to support much of a tune so what i did was start experimenting with Torco Accelerator to boost my octane level and at 1.6oz per gallon I reduced the timing retard to 4-5 degrees per cylandar and at 2.4 oz per gallon it completely elimingated the timing from being retarded and boost is now at 1.2-1.4 bar with the tune that Kevin wrote. While doing this i also installed the 997.2 inter coolers which drops the inlet air temps which also makes the air able to handle more fuel and therfore make more boost and power. I know this is a slippery slope I have headed down but I am very happy with the results and really just want to get the HP these motors were designed to make with the better fuels we used to have.

 

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Thanks Rodey. Will try that today... Intercoolers are next up!