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Old 03-21-2006, 06:07 PM
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Adding supercharger to ZZ4

I have a GMPP ZZ4 engine in (The Vicrod) rated @ 355hp w/405 fp torque. With 3.90:1 rear and TH700R4 the car runs great.
I am considering adding a supercharger. I have looked at the Weiand pro-charger 177 w/inter cooling to get the engine up to about 550hp.
Some of the questions are.

Is it realistic to think that 550hp can be obtained with a carburetor?

How do I deal with the spark curve?

Compression ratio on the ZZ4 is 10:1. Will this be a problem?

Should I change the cam? The ZZ4 cam is -- lift .474I, 510E duration @.050:.208*I, .221*E.
Rockers 1.5

Will the mechanical pump provide enough fuel?

Appreciate any input from those with real experience in this conversion.

I can get a sales pitch elsewhere.

vicrod

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Old 03-21-2006, 06:45 PM
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You got a leaky spark tube...
 
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Generally speaking, people will tell you it's not a good idea to do so. However, I put a 142 ci Weiand on a 9.8:1 350 of mine about three months ago. It's only making about 4 psi of boost but it made a huge difference. I just run about an 80/20 mix of 92 octane and 114.

That said, Im sure any of the blower gurus will be along soon and share their expertise.

Last edited by Blazin72; 03-21-2006 at 11:08 PM.
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Old 03-21-2006, 06:58 PM
How fast is fast enough?
 
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Running that high of compression is a little risky when boosting- one idea that I think will help you in many aspects is to remove your heads and not only port the runners (especially the exhaust) but take off some material from the bowls and polish them to a miror finish. This will serve two purposes- it will reduce hotspots and will lower your compression. Also water injection is making a comeback- something to think about.
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Old 03-21-2006, 09:53 PM
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I wont sales pitch ya here(lol), but Id call BDS for a chat with the tech guys.
10-1 is high, but if yer really adding an intercooler, I think (think) that will aid a lot in the boost factor.
Overall you could stay at low boosts and still get good power.
As far as the carb goes. I think it was Super Chevy that done a big SBC Weiand 177 or 174ci blower and used a single carb and got like 615 horses outta it, so yea it can be done. HG
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Old 03-21-2006, 10:10 PM
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Here's the blower boost/compression ratio chart from BDS....
http://www.blowerdriveservice.com/techcharts.php
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Old 03-21-2006, 10:19 PM
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Thats there chart, but I still think the intercooler will allow for more boost. Hg
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Old 03-22-2006, 06:20 AM
Technical Support Barry Grant
 
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Quote:
Originally Posted by vicrod
I have a GMPP ZZ4 engine in (The Vicrod) rated @ 355hp w/405 fp torque. With 3.90:1 rear and TH700R4 the car runs great.
I am considering adding a supercharger. I have looked at the Weiand pro-charger 177 w/inter cooling to get the engine up to about 550hp.
Some of the questions are.

Is it realistic to think that 550hp can be obtained with a carburetor?

vicrod

Probabaly not

Whipple made a kit for the ZZ4 engines, and were able to safely get 518 HP, & 544 Ft/Lbs with a more efficient compressor. To get the type of power you're wanting you're going to add something a little better than a 177. You may be able to get there with a good 250, and an intercooler, as well as better fuel. But if you're actually going to drive it on the street without getting into the bottom end of the engine 500 is probably the highest you're going to safely get from that long block.

As far as you're timing goes you'll need to change the curve completely to work with the supercharger.
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