Gotta say...WOW! Nice numbers though! Once you get this all sorted I would think that you'll be pretty happy... Especially if you can reproduce those numbers! Best of luck bud!

Very nice engine bay BTW!

 

Thank you for the compliments and the replies. The BOV is a Turbosmart 50mm. I went the BOV route because I don't think the bypass valve the kit comes with would be able to handle the boost I was going to make, so I was really just trying to avoid compressor surge. The intake was custom fabricated by the shop I had install it. Because of where he mounted the BOV, a new one had to be made because the filter would have been hitting it.

Since the most seem to believe that overtensioning the belt could be the issue, how do you know when tight is tight enough? Or when it is too tight or not tight enough? The directions only say "tighten the belt until there is minimal play in the belt".

So IMO that leaves a lot of interpretation of what is not tight enough and what is too tight.

 

I couldn't agree more that the instructions are unnecessarily vague.

Here is what I have done, partly out of guessing and partly out of my experience over the years with belts in various applications. There are 3 major methods typically used to confirm belt tension. Belt deflection, belt twist, and belt resonance.

Deflection doesn't work well in this case because there isn't a very long unsupported length of belt, and it's also difficult to access for measurement.

Belt resonance would probably be the best, but you need a sound meter to measure the frequency when you "twang" the belt, and we also have no reference for what we should be aiming for. I saw someone mention there is a smart phone app for this now, but without a target # it isn't very useful.

Belt twist may be the least accurate, but is very easy to use. You simply twist the middle of longest unsupported length (in this case, right next to the tensioner), and see how much rotation you achieve with a firm but not excessive amount of force. If it were a longer unsupported length, I would probably aim for 90 degrees of twist, but with such a short unsupported length I have decided to go with 45 degrees.

So far this seems to be working out well for me, but I'm not an expert and have only about 1000 miles on my kit so far.

 

Awesome, Habit, thank you for the tips for the belt tension. I really want to get this right on the second go round to avoid this happening again. So all information I'm gathering here will definitely be told to the installer.

 

The instructions call for 75Hz

 

I have a C38-91 that I am installing on my car too. I only have 91 octane so I won't get your numbers, but these are really great. I like your intake piping. It should get you lower IATs on the passenger side near the opening that comes from in front of the wheel instead of just behind the radiator as the kit has it.

Also, it appears that the top of your oil tank is above the level of the compressor shaft. The Rotrex instructions say to mount the tank such that the cap is at the same level or lower than the compressor shaft. You should be able to loosen the mounting rings for the tank, slide it down a bit and retighten the rings.

 

Where in the instructions do you see 75Hz? Also, in looking at the instructions and pictures they provided and comparing it to my engine bay, the oil bottle looks to be in the exact same position height wise.

 

Where do you see the 75Hz mentioned? I never saw anything like that, and poured over all the KW documentation quite a bit over the last 6 months.

The KW instructions show it the reservoir how yours is mounted, but the Rotrex instructions that were packaged with the blower specifically call for what beech said. I would have the shop lower it as much as possible (there are a few brackets and bits in the way, so you can only go down so far). I spoke with KW about this and they assured me it's fine, but I still think it's better to follow the Rotrex instructions.

 

Damn man so sorry to see that! What a bummer!! Awesome numbers though! Once that issue gets resolved it's going to be a beast!

Let me know if you need any assistance with kraftwerks or any order info etc.

 

Thanks Ryan! I should be good as far as that goes because he had to deal with them over the bracket issue, so they should have all the info they need.

Oh that's where he was getting it from Habit. I thought it was out of the KW directions. I will advise the installer of this as well, thank you.