Great! I like the data logging how are you getting the data via laptop? Can't wait to see the basline figures.

 

Hey Dog: What check valve are you talking about on the vacuum line? There should be no check valve between the manifold and MAP sensor or gauge. If your talking about a variance in boost reading while partially accelerating, then that is normal in all cars and is reflecting what IS and is not inaccurate. Remember that the engine is a pump and will fight between vacuum and boost at certain throttle positions. However, if you accelerate at WOT, there should be a jump in boost immediatley and no fallback at all with a steady increase in boost until you go less than WOT. If the gauge reflects anything other than an increase in boost while at WOT, look for a leak somewhere. Even the cheapest boost gauge, which may not display the correct absolute pressure, will not jump around but display a steady increase. The only other cause of a drop in boost reading would be a slipping belt, which you would certainly hear, or a loose elctrical connection between the MAP and gauge. Is this a dial or digital gauge?

 

How much boost are you running? Just curious 'cause of the 3.5 bar MAP.

 

Deputy correct me if wrong just assuming here, but just before this check valve closest to the manifold distributor in the picture is where the pickup would tap into. The gauge he said he was using is digital- 1999Porsche911. Hope I did'nt step on his toes here.

 

just installed my evo supercharger Mike from evo came up to Toronto to do the install. can't wait to drive it. just a quick question about headers and high flow cats. Mike says that the fabspeed headers and cats don't work well with the evo setup. something about back flow. does anybody have any comments. I'm ready to install the headers and cats.

JUNG

 

Yep, it's a digital sensor and gauge. The car is still at the shop, but it looks like the spot mother has in his pic. I'm about 99 percent sure that it's placed before the check valve. My installer said the MAP sensor would more or less take the place of the check valve now, and that they would probably seal the check valve off. That's if I understood him correctly.

I haven't driven the car yet, so I'm not really sure what it's doing. My installer described it as hitting 4.5ish psi under full throttle, and then immediatley dropping off. I'm assuming reading of less than 6psi is due to some loss with the intercooler plumbing, etc...

Viper: We're only running 6 psi at the blower.

 

DeputyDog, I have no expertise or experience in 911 s/c installs but in my other s/c install experiences, running a TEC2 ECU, I was using a two bar MAP sensor that was capable of reading 14.5 pounds of boost. A 3.0 bar is capable of reading 29.0 pounds of boost. By using a 3.5 bar MAP sensor you are likely losing a lot of resolution. You might see if you can drop back to a 2.0 bar MAP, assuming that your ECU can accomodate the change in signal. Just a thought.

 

Dog: You compressor is generating much higher boost that 6 psi. Depending how how Todd set you up, you should have 5 - 6 PSI AFTER the after cooler as measured from the intake manifold. If you are only showing 4.5 psi on the gauge, something is wrong. Personally, a prefer mechanical vacuum and boost gauges for accuracy.

 

Viper may be on to something there regarding the resolution. That had crossed my mind when I purchased this unit. Not sure if I can change that though. That's what comes with the unit. Maybe we'll hook up a mechanical one and run it into the passenger compartment for comparison. If we use the same vacuum hose that I'm currently hooked into, that should make for a good back to back comparison. I'm commited to this one now unfortunatley. Have too much money tied up into it

 

heheh that musta been fun

 

Hmm what pulley do you have? You might have a larger pulley than you should

 

Jungzilla,
I went with AWE's headers, hi-flo cat (300 cell) and fabspeed's mufflers on my SC 997S and my car must have picked up another 30 horses easily. Maybe fabspeed cats are not as effective since they are 100 cell. Have fun with the new animal!!

 

panos: did you dyno it? 30HP to the wheels is a pretty strong statement.

maybe i'm wrong, but i always thought that the lower the cat cell count, the better the flow? wouldn't a 100 cell cat flow more air than a 300 cell cat.

Sharky: I'm putting down about 402 to the wheels, so I'm making the HP that I should be. I can only assume it's the right pulley.

I asked Zeitronix about the accuracy of their map bar sensor and if they had a lower bar sensor. They replied that it was one of the most accurate sensors on the market and that the fact that i'm running such low boost on a high boost sensor would have no effect on it's accuracy. They also said that mechanical boost guages will read much differently than their digital sensor and that mechanical gauge will respond much slower than their digital setup. This may account for the rapidly changing boost numbers on the display.

 

bpanos: thanks for the info. I don't see how less exhaust resistance will hinder the performance of the supercharger in anyway. I'm gonna ask around alittle more but I think I'm gonna install it anyways.

 

2