The only connection to the BOV/bypass valve on both kits is a line from the intake manifold. When the manifold is at less than ambient pressure (the throttle is not fully open) the bypass is releasing pressure so you are running NA.

As soon as you open the throttle the pressure in the manifold equalises with that in the intake, the bypass closes and the SC is boosting.

The biggest kick you can get from the SC is to drive partial throttle at 5-6000 rpm and then mash the go pedal. Because at partial throttle you are pumping heaps of air but just circulating it in the intake. When you hit the throttle and the bypass closes you have an instant boost that throws you back in the seat.

In the standard SC kits fuel tuning is simply controlled by increasing fuel pressure proportional to intake pressure. And on the Comptech at least it errs on the safe/rich side. As X says, if you only use the standard kit there is little requirement (or facility for that matter) for tuning. It's only when you go above and beyond that tuning becomes necessary.

 

XViper, I took the plunge and wrote the check for a Comptech setup; we'll be installing the first Saturday/Sunday in October.

What I'm wondering about now is BOV's. Laugh if you like, but I absolutely love the way a turbo BOV sounds when you shift. Would it be possible to put an externally vented BOV on the Comptech? Doesn't it mount on the IC? If the replacement BOV operates at the same pressure, would there be any need for additional tuning? And finally, what does a BOV sound like with an SC? (Now I'm the curious one. )

 

 

LOL, not quite the same thing.

 

Thanks X and Aus. I am very familiar with turbo functionality and I have always thought of superchargers to be inferior forms of forced induction. That is until I joined this forum a few months back. Strange, but now I am convinced that supercharging is the way to go for a substantial increase in horsepower while retaining relative engine safety and longevity. At least for me. I think I'm sold. Once I put on the Fujitsobo and get the Comptech kit, not only will my car be significantly more powerful, but it should sound rediculous too

 

Comptech SC is a "BOLT ON KIT" no tuning necessary. Unless you WANT to use a piggy back system or EMS and tune the air/fuel out a little leaner to get a few more horses. Otherwise......install the kit and your done! If you want to upgrade in boost and get smaller pulleys then you can do so safely by getting a piggy back device or the complete EMS. Upgrade the injectors, adjust the air/fuel ratios and get it tuned and your done.

With a SC you still need to be selective of what gear you are in if you want to be able to move quick.... If you get caught at 3000rpms and go WOT...you aren't going anywhere fast.... But if you down shift 2 gears and are anywhere around Vtec....you will pull hard to redline.

BOV questions.... The stock kit is a bypass/bov which vents back to the stock air intake elbow. You can disconnect this and let it vent to the atmosphere.

I had a Turbonetics Godzilla BOV and in VTEC it is a very loud "swoosh" sound. Lower RPM shifts it just sounds like air under slight pressure.
At cruising it is a noticable venting of air just pumping out. As soon as you get on the throttle it will "thwip" close and you feel immediate boost.

I currently have the Greddy type S BOV that I had welded to the SC flange. I was going for the whistle sound.... and I got it! Now it sound like "swoosh...tweeeeeeeeeet".... High pitch whistle. It's nice!

I have pictures of both the Godzilla and the Type-S.

Tim

 

The Greddy type S BOV sounds like the ticket. Do you have any pictures of your install? Any audio files of the sound(s)? Any pricing info? Any links?

 

[QUOTE=RED MX5,Sep 29 2005, 01:03 PM] The Greddy type S BOV sounds like the ticket.

 

It's a "saying" - a colloquialism. He means that it's exactly what he wants. It has nothing to do with the police.

 

Man......I'm getting old...