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Old 09-28-2017, 01:11 PM   #1
KC2013ZL1
 
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Do these numbers match up to the mods?

Hey guys, question for you all. Bought a 2013 ZL1 a few weeks ago and had a couple questions. Supposedly the car has longtubes, Cold air, Corsa catback, catch can, and tuned. Dyno number said 587rwhp. Do these mods match up with the numbers ?
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Old 09-28-2017, 01:21 PM   #2
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Hello KC2013ZL1......Is your ZL1 auto or manual? Those numbers seem a little high for the mods you listed. Any way you can contact the tuner? Where did you get those numbers from?

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Old 09-28-2017, 01:28 PM   #3
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What dyno?

I think those numbers are attainable.
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Old 09-28-2017, 01:34 PM   #4
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That sounds high to me. My buddy did 543whp with his 2015 ZL1. M6 car, 2" primary long tubes, catless mids, NPP exhaust, 160*F T-stat, and a RotoFab intake. His tuner, whom has tuned many, many LSA cars, said that was a very very good number. It's hard to imagine being 50whp ahead of what's considered a very good number with similar mods.

The other thing is, the stock injectors are pretty well maxed out with bolt-ons. The aforementioned 543whp ZL1 is around 95% duty cycle with stock injectors, which is already really on the edge of safety envelope. Figure that 570whp would be 100% duty cycle, it's hard to imagine getting all the way to 590whp with an even remotely safe A/F ratio.

Maybe with a pulley and injectors... or the worlds friendliest dyno.
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Old 09-28-2017, 01:40 PM   #5
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It's a M6. Officially I can't say and the shop can't really tell me because it wasn't me that had the work one. But the Dyno sheet was from RDP. I'm more or less just curious if there might be something else that wasn't mentioned. I need to go home and crank her out. See how many lbs I'm pushing. Should help me figure out if there is a pulley I don't know about. Although, i can't hear any whine to it when get into it. Exhaust is pretty loud lol.

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Old 09-28-2017, 01:44 PM   #6
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Quote:
Originally Posted by KC2013ZL1 View Post
It's a M6. Officially I can't say and the shop can't really tell me because it wasn't me that had the work one. But the Dyno sheet was from RDP. I'm more or less just curious if there might be something else that wasn't mentioned. I need to go home and crank her out. See how many lbs I'm pushing. Should help me figure out if there is a pulley I don't know about. Although, i can't hear any whine to it when get into it. Exhaust is pretty loud lol.
Post pics of the two pulleys and we can tell you if they're not oem.
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Old 09-28-2017, 01:47 PM   #7
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Correction : 578rwhp. I'll definitely take some pictures when I get home and post them. Still learning about these cars. This forum has been unbelievably helpful. Thanks to all you in advance lol.
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Old 09-28-2017, 01:57 PM   #8
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Quote:
Originally Posted by KC2013ZL1 View Post
Correction : 578rwhp. I'll definitely take some pictures when I get home and post them. Still learning about these cars. This forum has been unbelievably helpful. Thanks to all you in advance lol.
Definitely more believable - still a pretty high number.
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Old 09-28-2017, 06:01 PM   #9
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99% impossible to hit that without a pulley change. My guess is it has a 10% or 18% pulley. As noted, get us a picture and we'll tell you real quick. Also you could probably tell yourself, aftermarket crank pulleys will have a separate damper with logos on it for ATI or IW with a pulley ring likely by Lingenfelter or similar. Upper pulleys will also be different if it's changed, it'll have a logo and likely a part number on the front of it. If it has a green belt, it's pulleyed.

RDP is a good shop. I'm sure if you call and explain that you bought it and you're looking for a build sheet so you have something to go off of they'll give you the low down.
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Old 09-28-2017, 06:16 PM   #10
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Hope these worked. Plus a pic of the car lol
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Old 09-28-2017, 09:16 PM   #11
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Just took it for a drive to the gym. Not exactly sure what the boost is. On the factory boost gauge, it is dead on with the PRESS mark if that is any indication.
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Old 09-28-2017, 09:47 PM   #12
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2013 ZL1 6-SPEED: Stainless Works Cat-Back; Pulleys, 90 lb Injectors, 14 lbs Boost, Dyno Tuned 553.20 HP & 561.64 TQ. The dyno pulls were made in 95 degree temps.
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Old 09-28-2017, 11:02 PM   #13
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The upper pulley is stock, and from what I can tell it appears the lower pulley is also stock (judging by what looks like a drill hole you can see at the top of the pulley).

It's hard to believe 578 at the wheels in my opinion, unless there is some stealth cam hiding in there. I'd think more like 540-550 based on the known mods and the seemingly stock pulleys.

Maybe you had a spike at the end of the dyno run when the limiter kicked in? What was the smoothing factor shown on the dyno graph? Was it 5 or something else? Also, was this STD or SAE?

OR- maybe you just have a really strong one!

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Old 09-29-2017, 12:44 PM   #14
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Just wanted to get an update. With some conversations I was able to have earlier, the mods I was told are exactly what I have on 93 octane. No pulleys, cam etc. Just what I stated earlier. Not sure the difference between regular longtubes and stepped headers would make that much of a difference. Something did. I'm gonna just go with a bad ass tuner that I will be traveling 3.5 hrs to go see here in the near future lol.
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