Maggie issue, bypass valve?

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Aug 20, 2006 | 03:30 PM

Third Gear

Thread Starter

Burning Brakes

Joined: Jan 2004

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From: Inland Empire CA

Maggie issue, bypass valve?

Okay, so here's the deal, the past few times that I've taken the vette out, I've noticed that it seems like the supercharger isn't "kicking" in some times.

Ex. I'm in 2nd gear on a freeway onramp. I nail it and nothing is really happening. The rpms are climbing slowly and then it seems like it isn't boosting until about 4.5-5k. So I'm wondering is there an issue with my bypass valve? Because that would explain it acting like a turd - no boost and a way too fat AFR for NA power.

Am I right on this? Because having no throttle responce is annoying as hell.

Aug 20, 2006 | 04:16 PM

itchynackers

Pro

Joined: Aug 2004

Posts: 651

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From: Janesville WI

Thats what it sounds like, the bypass is sticking maybe?

Aug 20, 2006 | 04:54 PM

Warp Factor

Le Mans Master

Joined: Oct 2005

Posts: 7,088

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From: Metro Detroit Michigan

Could be a lot of things.
Bad gas causing the engine to pull timing, high IATs causing the same thing.........
Is this intercooled?
What's the boost gauge say?

Aug 20, 2006 | 05:02 PM

Third Gear

Thread Starter

Burning Brakes

Joined: Jan 2004

Posts: 933

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From: Inland Empire CA

Hmm... I suppose it would be a good idea to do some logging with HPT and see what's going on. I know the IATs are high - it's non intercooled. They're probably in the 190 range with the weather now.

I still haven't gotten around to installing the boost gauge and pillar. I hooked it up temporarily about 2 months ago and it does boost the full 5psi.

I'm going to call Magnacharger Monday and ask them if that sounds like the bypass valve acting up.

Aug 20, 2006 | 05:10 PM

Warp Factor

Le Mans Master

Joined: Oct 2005

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From: Metro Detroit Michigan

I don't believe you'd have full boost if the bypass was the problem.
Or is the boost gause no longer hooked up?

Aug 20, 2006 | 06:12 PM

Third Gear

Thread Starter

Burning Brakes

Joined: Jan 2004

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From: Inland Empire CA

yes, as of right now there is no boost gauge....

Aug 20, 2006 | 06:43 PM

Warp Factor

Le Mans Master

Joined: Oct 2005

Posts: 7,088

Likes: 1,829

From: Metro Detroit Michigan

Quote:

Originally Posted by WickedC4

yes, as of right now there is no boost gauge....

Well then, do like I've done (I have no pride). If you don't want to install it right now, duct tape the sucker to the outside of the windshield and drive it. See what's up with the boost.

Aug 23, 2006 | 12:34 AM

S/CZ06

Advanced

Joined: Jun 2006

Posts: 59

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From: Marysville Ohio

I do know of people having belt slip with maggies. Maybe the belt is slipping just a little bit until it heats up and gets a little tacky? Just a guess.