I went to the tuners this morning and I did not likr the news I got. The first run I did on the dyno I got 251 HP in 4th gear but I only hit like 3.5 psi. So I was like what the hell. So he figured there was some kind of leak some where so he adjusted the BOV and worked with the tune to lean things up at the top and I ended getting a max of 307 HP but only at like 4.5-5 psi. We tried to tighten all the fittings but from what we found they were all tight. He then did a 5th gear pull and ended up getting 332 HP at like 6-6.5 psi. It was better than before but I can't understand why I am getting different psi in different gears. Since the supercharger is controlled by the belt should'nt I get the same boost in all gears. I tried calling Vortech but they had no idea what was going on and didn't seem very helpful. Also the way he adjusted the BOV when I let off the pedal if flutters as the air is let out. Anybody have some ideas what is going on? I am going to take it back to my friends shop where we installed and we are going to look around but we are not exactly sure what we are looking for. Any help is welcome.

 

Check all the connects. Sounds like a boost leak.

 

Boost is built up as the SC spools up. The higher the RPM, the more boost the Vortech (centrifugal) supercharger can put out. It doesnt matter what gear you're in, as long as you have the RPM's the boost should be there. If you're getting more boost in higher gears, it probably has to do more with the duration of time than what RPM you're in. If this is the case, you more or less have a leak and or the SC is defective (turbine/impeller inside bent, or not aligned, or the housing has clearence issues). Another thing to look into, sometimes it throws people off, are you getting enough fuel? Is the fuel supply OK? Pumps are running, pressure is there? Check that as well. I doubt your problem is in the "tunning" end of the installl but more so a mechanical / delivery (air or fuel) problem. If the connections are all tight, check the actual unit. A simple (just use EXTREME caution) way tos ee if you may have a vac leak is to spray some quick start or like carb cleaning in and around the throttle body, intake, supercharger and its piping. If you see a sudden increase in idle (sometimes even a drop), you have a leak. Like I said though, do it with caution and a little common sense. Last but not least, the blow off valve you're using, try a run without it, if you can bypass it, or just block its inlet off. That will eliminate a faulty valve unit, which by the way, is not uncommon. Good luck with your ride! I hope you find the problem and get it fixed without much hassle.

 

After preasurizing my system , Pipes , intercooler , motor ,and exhaust ,with air preasure from my air compressor . I found that the BOV and pipe fittings are not likely to be the problem . I put in 25 psi in it and my gauge read 18.5psi . I had leaks on my plenum [ aftermarket ] I doubled up the gasket and its better but still leaks a little . Was going to put a third one on today , but cant get one till tomorrow , hope I can get it in before the tuning session in the afternoon .
Your BOV shouldnt be tightened down , to where you get flutter . Back it out alittle at a time till it goes away . I have 7 threads showing on mine .
You either have a belt slipping or a leak . And the really only way to find a leak , other than what you already have done . Is by preasurizing it .
You have to cap off the exhaust [ not easy ] Undo the fitting right before the BOV and have a pipe made , that is capped off with a male air compressor fitting hook up to the end of it .Clamp that pipe to the the pipe right before the BOV . You'll find the leak then

 

The reason why I said its a leak is because I saw your other post where you said the intercooler wouldnt line up because of the MAF sensor pipe. That right there tells me it might be on wrong. Flip the pipe around that goes down past you AC line and try and line things up a bit.

 

Thats what I was thinking but from the top of the engine bay we checked all the fitings and even took of the front bumper and tightened everything. But what I don't understant is why I am boosting more in 5th gear than in 4th at the same rpm's. Here are the dyno charts.

 

from the looks of the third dyno . The shop leaned the A/F out to much trying to make power . Try what ducatiguy suggested . And at last straw what I suggested . I wouldnt get on it till you get that A/F down some and find the leak , or bad SC ?

 

Well from what we could tell we couldn't find leak. We tightened all the clamps and I even put my hand around all of them to see if I could feel anything including the bov and I didn't feel any leaks. I also started to notice that the charger itself was making a high pitched noise at idle not like the whine of the charger but like the sound of when a radio station tests its emergency system sound. Not sure if this was normal so I figured I would ask. I also called Vortech and I told them what was happening and they said I was loosing boost b/c of the test pipes and exhaust. I figured I could loose maybe a pound or two but he said thats why I could be missing upwards of 5 PSI. He also said it was normal that the blower would produce more boost at higher gears and I wasn't sure of that either. I also asked if something could be wrong with the blower itself and said it clould be a possiblity and that I could send it back to them. But I rather leave this as a last case scenerio. What do you guys think?

 

did you stick with the main serp belt the kit came with? If so, I bet that's your problem. I was only making 4.5 lbs of boost my first tune...tightened the belt and BAMMM, 9lbs, with an 8lb pulley. After a week, I was back to making 5lbs...found out the belt the kit comes with stretches, so, with the help of Booger, i upgraded to the Gates belt and viola! No more slippage...you;re gonna hurt something with those AF's...fix the belt and you'll be fine.

 

btw, have your tuner run your dyno's in 5th...1 : 1 ratio

 

boost is also dependant on load!!!

Rev your engine in neutral. You'll make some boost, but not alot. That is beqcause there is no load on the engine. By having the engine in 5h (1:1 ratio), you have more of a load on it than in 4th gear. chassis dynos (like a dynojet) don't load the engine the same way as if you were really driving on asphalt.

 

I am running the Gates belt that yous guys recommended. If forget the # but its like K0...... not sure. I don't think its slipping, it is pretty tight and can barely be moved up and down. As for the air fuel #"s I thought at wide open throttle you should be around 11.5-12. If not, let me know.

 

Yeah it was on a Dynojet, so I guess I am at arould 333 to the wheels but still only getting like 6-7 psi at peak on the 3.12" pulley

 

I had headers , RT cats , and Stillen dual exhaust on when I first installed the Vortech . I could only make 7lb's of boost .When I changed to Crawford cats , the boost went to 9psi . This stuff cant be a pain in the a$$ ti figure it out

 

The guys that are saying they had had a loose belt at first, was it loose to the touch or even though it was slipping it still tight to the touch. Mine is tight to the touch but I guess I could still be loose according to what you guys are saying. I just started up my car to move and it squealed f it or like 15 seconds but yet feels tight. As for the belt it is Gates #K060935. What do you guys think?