I just bought a boost gauge for the S/C. Which line is the vacuum hose that I need to "T" into?

 

Is it the rubber line going into the brass fitting on the FPR?

 

Anyone?

 

Yep, that line will show the boost and the vacuum that is inside the manifold.

 

Just tee into the line run to the FPR.

 

Is this the same mod we were talking about at the meet?

 

Let me know how much boost you're getting after you get the gauge installed. My S/C gets 3.5 PSI max.

 

this thread is useless for me.. it's as if you guys are speaking chinese

 

3.5 psi? i thought the s/c gave like 6 psi of boost... 3.5 seems a bit low

 

As per CompTech, 3.5 PSI is the stock max. boost. It's plenty of boost and makes 305 WHP/262 TQ as dyno'd at CompTech. Any more boost and there would be issues with the cheap ass Calif. gas.

 

About 4 PSI for many at the peak. At the lower revs it is about 3.0 - 3.5. The HBP (3.275ALT) just it up to about 5.5 PSI.

It is low boost but does a great job with the engine. A little more boost and you get even more power out of it.

 

I wouldn't say that for sure. There are some running the HBP in CA without a problem.

 

You think so? Wouldn't I also need a different belt with the HBP. And if I were to order a HBP, does CompTech sell one?

Oh, now you've do it!!! You've got me thinking about it now.

 

Nope, the same belt works just fine and yes, Comptech is the supplier of it.

 

Steve the stock s/c belt that comes in the kit can be used if you swap in the HBP pulley? I was under the impression you'd need a new belt.

 

Nope, same belt is used. Heck, I have had at leat the HBP since April of 2003 and it is the same one. Meaning, I am stull using it with my current set up.

 

So how many Calif. people running the HBP, how long and any issues? I would appreciate your feedback because I'm seriously considering the HBP.

thanks...

 

I don't know totals but at least one and for several months. Others will need to chime in though.

 

I was inquiring with a local installer about the HBP, and whether or not to get it. He called CT directly and 5 minutes later called me back saying, 'ya they sell it, costs $80. But it also completely voids the warranty on the S/C kit'.

That's a big risk to take unless you're able to fix/repair any problems yourself.

 

The only real thing to worry about is the SC. These Eaton/Magnuson blowers are not something to worry about. If the system is working fine at the beginning it will be fine with the HBP and there are no warranty concerns.

 

Scalbert:

Do you know what the torque specs are on the HBP and belt? I swear I'm still getting slippage at the higher RPM's. I'll know for sure once I get the gauge installed. I'm off to find a "T" filling.

 

Same specs as with the base pulley. In fact, since the HBP is a larger diameter unit there should be less chance of slipping.

 

I was told just the opposite by Shad at CompTech. The larger HBP (alternator pulley) could cause more belt slippage if belt isn't tightened properly.

 

That goes against any conventional thought on pulley contact. A larger pulley will have more contact area with the belt. Think of the contact patch of a tire; more area increases the grip level.

That is unless the change of the pulley changes the position on another pulley. The only way I could see this being an issue is if the larger diamter of the ALT pulley (HBP) adjusted the tensioning point to where the SC pulley had less contact. That might be the case here but after what I have seen it is not an issue.

And I have had on at least five different pulley combinations.

 

I'm glad you have had contact with him. Several voice mails and now an email go unanswered spanning nearly a month period.

 

What I was told by CompTech was that the larger alt. pulley (HBP) increases the angle of attack on the small blower pulley which lessens the belt contact area on the small blower pulley.

 

I think i'm getting close to going HBP I'd probably have it done at the dealer. I'm also looking to order some 100 unleaded gas to mix in with our pitiful 91 crap. What octane do you think i should go with Scalbert ??

 

I have a can of Motorsport 103 sitting in my garage with your name on it! It's unleaded as well.

 

What are you gonna do ??

If you do, will you have Comptech or the dealer install ??

 

I spoke with him a couple of months ago when I had them fix my ESM/ECU wiring problem. Also, he's been pretty good about returning my voice mails. But sometimes he's out of town for weeks at a time on CompTech business.

 

Are you guys sure the 6-speed comes with a 3.5psi pulley? That's a lot of whp for 3.5psi!

 

That is what I was thinking they would say and what I referred to in the 2nd paragraph.

But, by adjust the position of the tensioner pulley towards the SC pulley a small amount can get you back at near the same overlap.

 

If I do go with the HBP, I'll probably have CompTech do the install and dyno. That's assuming there are no blower warranty and/or CARB issues.

 

It is more like 4 PSI. Remember, at this low of boost the parasitic loss is much less as is the loss through temperature increases. Probably not too far off from a turbo system. It is as the boost goes up that a turbo really starts showing it's superiority.

 

When CompTech dyno'd my car, they also checked how much boost it was getting. It had a max. boost of ~3.495 PSI where the outside temp was in the mid 60s. I also have the CompTech headers and full catback exhaust.

 

Makes sense then as I was seeing about 4 PSI with the factory exhuast. When I opened the cut-out I see about 1+ PSI less.

 

I'd be interested to hear what the response is when you ask about warranty. As I said earlier, they already told a local aftermarket shop here (who has a good relationship with CT... Shad has been in the shop a few times...etc), that it voids the warranty on the "kit". I don't know if this differs from the warranty on the actual blower itself, but either way, regardless of the relative risk assocaited with it's use, it seems CT has a hands off policy once its installed. This susprises me considering they sell it themselves...

Any other past stories or current info would be appreciated.

 

Maybe they are waiting to see how some of us are fairing after a while with it on. I have nearly 1.5 years with at least the HBP.

 

I just called CompTech and they confirmed that the warranty would be voided with the HBP as previously stated by derelict; even if they did the install. However, after the two year warranty is up on the blower, they said that would be a good time to consider the HBP; as a number of people have done. Since I already had one blower unit replaced back in May and have another 17 months left on my warranty, I think I'll wait. However, I may go ahead and buy the HBP now so I have it on hand when it comes time to do the install. Or would that be too tempting?

 

Why not just do it? If the blower goes, take off the HBP and install the pulley that came with the kit. How is Comptech going to know? Unless, you are having Comptech do all the install work.