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Old 09-25-2012, 05:29 PM   #205
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I've been told running without cats would only gain around 4HP peak so I figured I'd keep cats. The ZL1 with the muffler butterfly gets quite loud with headers and HF cats so I don't think I'd like the sound without cats. I draw a lot of attention simply passing someone quickly as it is.

On the 1 7/8 vs 2" primaries, I wanted to try 1 7/8 first and see how things look on the dyno, then I may try 2" later. I would rather have better torque across the power band vs the highest peak HP. If I do 2" primaries later, I may also go with larger diameter exhaust all the way to the mufflers but the sound will probably be nuts then! I'll need to wire the muffler butterflies on a switch so I can keep them closed all the time unless at the track.
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Old 09-25-2012, 06:12 PM   #206
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So, the larger the diameter of headers, the lower the torque? So you went with 1 7/8" into, what size merger collectors?
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Old 09-25-2012, 07:06 PM   #207
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Mine are 1 7/8" primaries to 3" collectors.

Every engine has a sweet spot of what it likes. You can go so large on the exhaust looking for high RPM flow that you start to see low rpm torque drop and the throttle response can start to feel soft off the line reducing the fun factor around town. Having said that, my experience is with NA engines. This is my first build of a supercharged engine and I know that changes things.

Will 2" primaries cause this problem on my combination? I don't know. I probably went a little smaller than I should have being worried about something that won't happen. I think KDi is running 2" primaries and 3" exhaust all the way to the stock mufflers on their ZL1 with ported supercharger, cam, and 102TB. I plan next year sometime to "experiment" a little with larger exhaust, higher ratio rocker arms, and maybe different CAIs for A/B comparison.
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Old 09-25-2012, 07:14 PM   #208
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Ok,thank you so much.
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Old 09-26-2012, 03:35 PM   #209
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Quote:
Originally Posted by Godsplumber View Post
So, then if i am understanding what is being said here, I dont really need the cats but it would be reccomended for the purpose of too much sound, and im not to hip on a gas smell.
if you don't like the gas smell run cats. cats cost money and a couple hp but they will cut down on the gas smell.

I will most likley keep cats for that purpose.
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Old 09-27-2012, 06:01 PM   #210
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Dyno on 10/10?


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Yup! Dyno on 10/10. I'll post the results. In the mean time, Installing a line lock so I should get some 1/4 mile runs in before November as well!
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Old 09-27-2012, 09:18 PM   #211
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yup,,no cats has a different smell, but I prefer the slightly fuelly smell compared to sulfer dioxide.. but I try not to sniff the exhaust for the most part. The biggest thing to be ok with isn't the smell, its the extremely loud exhaust sound. I like it, but its really really really loud.
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2.55 upper, 10" lower pullies, Innovators west billet hub and sfi balancer, solid blower drive isolator, 50 mm idler kit, full length S/S headers no cats, comp cams custom grind cam, comp roller rocker trunion kit, comp push rods,dual valve springs retainers and locks, Injector dynamics ID850 inectors, Rotofab ZL1 cold air kit, Lingenfelter 160 thermostat, Rotofab intercooler reservoir, stock plugs, LS7 90mm throttle body, GTO clutch reservoir mod, my own custom catch can, Tuning by Jannetty, install by me.
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Old 10-02-2012, 03:56 PM   #212
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are you staying with the factory H pipe, or going with an x-pipe?
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Old 10-11-2012, 12:12 AM   #213
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No Dyno today. Had to push it a week. :(

Sucks when ya gotta work to pay bills!
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Old 10-11-2012, 09:28 AM   #214
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Dang it.
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Old 10-12-2012, 11:10 AM   #215
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Quote:
Originally Posted by Godsplumber View Post
are you staying with the factory H pipe, or going with an x-pipe?
Were you asking me or op?
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Old 10-12-2012, 11:16 AM   #216
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Just an update on my progress, I have now ordered the 10" damper/pulley/idler combo to go with the 2.38" upper I have. Anyone know what belt length to use? I only see listings for the 10" lower with the 2.55" upper.
Also in the next month or so I should be ordering my injectors which is the last part I need before installing my cam. Should be interesting. I'm not looking forward to the junk in the way of the pan etc as the op described, but it is what it is...
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2.55 upper, 10" lower pullies, Innovators west billet hub and sfi balancer, solid blower drive isolator, 50 mm idler kit, full length S/S headers no cats, comp cams custom grind cam, comp roller rocker trunion kit, comp push rods,dual valve springs retainers and locks, Injector dynamics ID850 inectors, Rotofab ZL1 cold air kit, Lingenfelter 160 thermostat, Rotofab intercooler reservoir, stock plugs, LS7 90mm throttle body, GTO clutch reservoir mod, my own custom catch can, Tuning by Jannetty, install by me.
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Old 10-14-2012, 12:19 PM   #217
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Were you asking me or op?
The OP, but too late now
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Old 10-14-2012, 11:54 PM   #218
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Quote:
Originally Posted by Godsplumber View Post
The OP, but too late now
Oops. I thought the question was for 2012ZL1. Sorry bout not responding. My car is stock from cats back. It'll stay that way unless I go 3" in which case I'll go X pipe.

Not likely to change it though unless the performance really disappoints. Shooting for taking the car out Friday the 19th and see how it runs in the 1/4.

Got the drag radials ready to go, Line lock installed, and getting the race gas tune on the dyno this Wednesday morning. Hoping everything falls into place.
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Old 10-17-2012, 12:48 AM   #219
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1st gen, what line lock did you use?
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2.55 upper, 10" lower pullies, Innovators west billet hub and sfi balancer, solid blower drive isolator, 50 mm idler kit, full length S/S headers no cats, comp cams custom grind cam, comp roller rocker trunion kit, comp push rods,dual valve springs retainers and locks, Injector dynamics ID850 inectors, Rotofab ZL1 cold air kit, Lingenfelter 160 thermostat, Rotofab intercooler reservoir, stock plugs, LS7 90mm throttle body, GTO clutch reservoir mod, my own custom catch can, Tuning by Jannetty, install by me.
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Old 10-17-2012, 04:24 PM   #220
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1st gen, what line lock did you use?
Hurst kit for the 5th gen Camaro
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Old 10-17-2012, 04:25 PM   #221
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724HP and 677ft-lbs on pump gas!

Didn't do a race gas tune today as we ran out of time re-tuning for the Livernios dual fuel pump. Video and pictures will be uploaded tonight as I'm at work right now.

Even though we didn't do the race gas tune, I'm going to run the car at Firebird this Friday night and I'll share how that goes.

Right now real quick I want to thank Damon, Keith, and KDI and New Era, as well as the whole crew at Loud Pedal in Tempe, and David with Mast Motorsports in Texas. This car has really impressed me today and I'm loving it!

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