Hi all,

my car curently is not going up to 0.7 max boost as it should....


how much Hp loss can 0.1 cause?
how much torque?


harris

 

Stock is .6 or .7 depending on climate and fuel. You are not losing anything, unless you have an X50 then you are a little down on power...

 

I know that stock is 0.6 or 0.7....

depending on fuel and weather conditions it should be 0.7 since temperature was -1 Celcius and fuels was shell V-power racing 103 octane


but the question is if there is any difference in power between 0.6 and 0.7


harris

 

Harris,

That is a question with many facets. It's not just the amount of boost that determines HP. You could be producing just as much HP at .6 with timing not retarded as at .7 with the timing be retarded a little. Your ECU decides how much boost based on all the inputs like air temp, throttle body opening, etc...

But obviously if you are talking all the same exact parameters from one day to the next then of course there is more power in higher boost. You just don't know that all those parameters are exactly the same.

 

slant911,

thanks a lot for the answer...

I am totally new with turbo engines....forgive me


I have a feeling though that something is wrong with the car and it can't boost up to 0.7...

car has extended porsche warranty so I am not that anxious in order to sort out the prob...

they told me they will do a leak test???? or something like this to find out the prob...


will keep you posted...


harris

 

Further to the above, for -1 Deg C, at such a low temperature the air mass is high and the ECU will tend to "ask" for less boost to hit the targeted air mass needed to hit the programmed DIN power levels...

 

Well said on the explanation. Colder air requires less boost to make same power. Until you can try it in warmer weather I would not worry about it. Also you could try the wastegate tweak that might give you and extra .1 bar most of the time. Not sure it works on unchipped car but do not see why it would not.

 

1st question: How are you achieving your max boost reading? You should be in 4th or 5th (possibly 3rd) at WOT...not spikes, but held boost.
2nd: How does the car feel? Same as usual or slugish?
3rd: Have you hooked up a code reader and read any possible codes stored in the DME?
4th: Do not play with the wastegates....this will only confound the problem and likely cause more.

 

answers:
1: in any gear I do not get 0.7 ( as I did same days ago when I bought tha car)

2: I have a feeling that It does feel a bit less lazy...(but this might be cause because I might have been used to this kind of power. may be the car is ok according to what said but I feel I am not going that fast or I am not geting the big punch at my back) - I doubt I can feel the difference of 0.1....

3. NO. car will be in an OPC next tuesday and they will check it for me

4.ok I will not....

 

You need to talk with Kevin,

I had this same problem and now thanks to Kevin I constantly see...


1+ Bar.

 

Hey Harris, replace your diverter valves. The stock ones are crap. The same thing happened to my car. Are you getting any cels? And by the way the extended warranty does not cover DV`s so when they change them for you, thet will charge you $800 and you will still have the crappy DV`s. So change them yourself now.

 

what make of DV should I go for?

harris

 

There are a ton of choices. I have the Forge valves from UMW. One thing I would insist on after having installed several sets of these things is that the top vacuum nipple go out the side or at the very least be a 90 degree bend out the top. Straight out the top like a lot of them are designed is going to be a royal PITA to install. There just isn't enough room above those things. I feel also that it would invite pinched lines having them go straight out.

 

Forge makes a great DV and they come with different springs and shims for varying levels of spring pressure to match boost. From stock to 1.5 bar+....