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Old 04-15-2012, 05:56 AM   #126
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Wink Go figure!

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Originally Posted by 2ndCamaro79 View Post
If getting power is that easy why did GM, just not do these things from the start?? Or why don't the 2013s come with a pully change and better cold air unit so you don't have to loose the warranty on a 60K car??
Shhh...don't let the cat outta the bag!There is a reason it was almost called the panther because panthers ate mustangs! And how else are they going to suprise us to bump up the performance on the ZL1 with the new GT500 2013 stats.
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Old 04-15-2012, 06:07 AM   #127
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I think 130 is plenty and in race car terms knocking on 10 zero's. For ET they need to launch the heavy car with gear or low end torque. Gear is the easy answer for that and 4.10's will still not hit the limiter in 4th at the stripe at 130.
With 3.70s I hit the revlimiter in the last 100' and needed to bump it up to 7000 to make it without shifting into 5th. Mine is an auto though so not sure whot it would be with an manual.
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Old 04-15-2012, 06:14 AM   #128
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Arrow Reaction time...

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Originally Posted by Pgoldston View Post
I like what I see. 10s should be easy with that mph. Are the 60' ft's limited by the tire or testing? As well will a 17inch rim fit on the back with a slick and can you hit the car any harder? I may have missed it manual or auto?

If you dont mind me asking did you get any air temp data?

Sorry for all the questions more interested in data than the actual run, but the run is nice and shows that once time is given the zl1 will be able to kill at the strip and the road course with out affecting each other.
The reaction time looks pretty slow to me as well...
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Old 04-15-2012, 06:45 AM   #129
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Thumbs up LMFAO...

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I hope you are talking about a bull because 8 seconds with anything other than a car or a bull is embarrassing no matter what the circumstances are
Thats not what SHE said...
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Old 04-15-2012, 06:57 AM   #130
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Exclamation Opinion...

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Originally Posted by 2012ZL1 View Post
more hp to go faster, more gear to go quicker...(in this case) I agree with the 4:10 observation, unless of course you are aiming for real low 10's high 9's in which case more power to the level of needing a forged rod/piston combo I think.
If you go with a 4.10 in the rear don't plan on doing well in autocross with that setup...
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Old 04-15-2012, 07:02 AM   #131
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The reaction time looks pretty slow to me as well...
R/T has no effect on ET.
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Old 04-15-2012, 07:22 AM   #132
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Originally Posted by Pgoldston View Post
I figured that.

What do you guys think the hp limit will be on the zl1 with pump gas? Or is that a wait a see thing?
The power curve at the start of the thread, shows a safe number for 93 oct, with cat protection still enabled. If we ran leaner with no cat protection it would easily surpass 600 rwhp.

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Old 04-15-2012, 08:10 AM   #133
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Originally Posted by Graham Behan View Post
The power curve at the start of the thread, shows a safe number for 93 oct, with cat protection still enabled. If we ran leaner with no cat protection it would easily surpass 600 rwhp.

Graham.

So what I am reading is Non-Emission state ZL1's have more potential....... Im going to be registering this thing in New mexico anyways.
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Old 04-15-2012, 08:14 AM   #134
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So what I am reading is Non-Emission state ZL1's have more potential....... Im going to be registering this thing in New mexico anyways.
Yes, sir, this car was completely stock exhaust and cats and if we leaned out the AFR from the low 11 high 10:1 where its at, 600 rwhp is no problem, without resorting to headers.

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Old 04-15-2012, 08:48 AM   #135
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Yes, sir, this car was completely stock exhaust and cats and if we leaned out the AFR from the low 11 high 10:1 where its at, 600 rwhp is no problem, without resorting to headers.

Graham.

I had a feeling the AFR was that low. Thats good to hear.
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Old 04-15-2012, 09:05 AM   #136
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Graham,
My planned mods were a 2.55 upper, cai, LT headers,no cats, and a cam like an ls9 or similar.
With a tune, how much rwhp should I expect on 93 octane? race fuel?
Do I need a fuel pump or injectors?
Is it possible to send you my ecm for tuning, and how much is a tune?
Considering the boost drop from the LT's should I consider a 2.38 pulley instead?
Thanks, Mark
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Old 04-15-2012, 09:19 AM   #137
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Quote:
Originally Posted by 2012ZL1 View Post
Graham,
My planned mods were a 2.55 upper, cai, LT headers,no cats, and a cam like an ls9 or similar.
With a tune, how much rwhp should I expect on 93 octane? race fuel?
Do I need a fuel pump or injectors?
Is it possible to send you my ecm for tuning, and how much is a tune?
Considering the boost drop from the LT's should I consider a 2.38 pulley instead?
Thanks, Mark
Hi Mark,
If you plan headers and a cam the 2.38 will probably be the best solution, you definitely need injectors and probably a fuel pump, we have tested to 20 volts of boosting of the stock pump and although it will deliver enough fuel, we would not advise this for a long lasting solution. Yes it is possible to send the ECM but we do offer an Autocal that can do this, or if you have EFI Live we can E-mail it.

I would estimate 630-640 rwhp could be reliably achieved with these mods, but we will test this configuration early next week, sans headers and let you know. I have no idea on sale price of tune, I just get to do the engineering, oh and like today, build an engine in a yellow car

Graham.
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Old 04-15-2012, 09:29 AM   #138
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Graham

What type of fuel system is on the zl1? All my time is on the ford side of things and I havent been keeping up with GM. Is this a modulated returnless system or a return setup?
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Old 04-15-2012, 09:30 AM   #139
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So just so I understand, to run toe to toe in the HP/TQ numbers with the overpriced '13 Shelby how much do you have to spend on the ZL1? I thought I heard negative comments about having to add track pack and such to the Shelby to get the best out of it? I'm confused...
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Old 04-15-2012, 09:37 AM   #140
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Quote:
Originally Posted by Fenderaddict2 View Post
So just so I understand, to run toe to toe in the HP/TQ numbers with the overpriced '13 Shelby how much do you have to spend on the ZL1? I thought I heard negative comments about having to add track pack and such to the Shelby to get the best out of it? I'm confused...
cold air and pulley does it. My guess less than 500 bux.
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Old 04-15-2012, 09:39 AM   #141
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I just noticed the pics of the yellow cars engine! AM I RELIEVED!! It looks like you can actually work on this car unlike the previous gen cars.
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Old 04-15-2012, 09:39 AM   #142
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Quote:
Originally Posted by Pgoldston View Post
Graham

What type of fuel system is on the zl1? All my time is on the ford side of things and I havent been keeping up with GM. Is this a modulated returnless system or a return setup?
Its a PWM system and unlike the CTSV system it varies the fuel pressure at WOT, cadillac is full on at that point.

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Old 04-15-2012, 09:44 AM   #143
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oh ok, Im guessing that it has a delta pressure sensor for the injectors, and has a modulator? When the car is ran hard has there been any issues with the modulator getting hot and shutting off mid run? Just asking as this was a issue with some of the ford setups requiring to run 2 modulators or other changes.

Thats odd that the CTS-v doesnt modulate at all. I would figure that would lead to fueling issues, or fuel pressure spikes unless I am missing something.
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Old 04-15-2012, 09:47 AM   #144
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Quote:
Originally Posted by Fenderaddict2 View Post
So just so I understand, to run toe to toe in the HP/TQ numbers with the overpriced '13 Shelby how much do you have to spend on the ZL1? I thought I heard negative comments about having to add track pack and such to the Shelby to get the best out of it? I'm confused...
I honesly would not want the SVT track package because I would not be road racing it. If I got a 13 GT500 I would be just 1/4 mile racing it. I would want the base 13 GT500. At the right dealer you can get one for under MSRP. Invoice plus dealer holdback is 49k. Yeah, ive been looking..................
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Old 04-15-2012, 09:51 AM   #145
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oh ok, Im guessing that it has a delta pressure sensor for the injectors, and has a modulator? When the car is ran hard has there been any issues with the modulator getting hot and shutting off mid run? Just asking as this was a issue with some of the ford setups requiring to run 2 modulators or other changes.

Thats odd that the CTS-v doesnt modulate at all. I would figure that would lead to fueling issues, or fuel pressure spikes unless I am missing something.
I didn't say the CTSV does not modulate at all, just that it does not at WOT. So far we have seen no issues with the PWM controls that are employed in the GM vehicles we have modified over the years.

Graham.
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Old 04-15-2012, 09:55 AM   #146
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I didn't say the CTSV does not modulate at all, just that it does not at WOT. So far we have seen no issues with the PWM controls that are employed in the GM vehicles we have modified over the years.

Graham.
I got that it doesnt modulate at WOT only, just seems odd to me.
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Old 04-15-2012, 09:55 AM   #147
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Graham,
Your thoughts on using an upper/lower pulley combo instead of a real small upper?
Do you know at this point if the lower pulley/damper set up for CTS-V will work on the ZL1 considering the lack of belt driver p/s on the ZL1? Also as far as rwhp estimates go, my car is a manual trans if that makes a difference. What cam are you using in the yellow car? the GT9?
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Old 04-15-2012, 10:12 AM   #148
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Quote:
Originally Posted by Fenderaddict2 View Post
So just so I understand, to run toe to toe in the HP/TQ numbers with the overpriced '13 Shelby how much do you have to spend on the ZL1? I thought I heard negative comments about having to add track pack and such to the Shelby to get the best out of it? I'm confused...

My guess is that these cars are much more comparable than people like to think. Add some stuff to the Shelby, and it will be on the heels of the Z in the twisties, and add some stuff to the Z, and it will be on the heels of the Shelby at the strip.
I'd assume a good pulley, cold air, and tune will get the Zl1 close to the Shelby. The shelby runs a bigger blower with alot more boost though, so it may take a bit more considering the weight difference.
I'm not sure how easy it is to put real slicks on the Z, as the brakes are huge.
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Old 04-15-2012, 10:21 AM   #149
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Originally Posted by 2012ZL1 View Post
cold air and pulley does it. My guess less than 500 bux.
I'd at least double that estimate, so as to include a tuner + tune and possibly a puller for the pulley (I can't see how it is attached to the SC).
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Old 04-15-2012, 10:24 AM   #150
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Originally Posted by 2012ZL1 View Post
Graham,
Your thoughts on using an upper/lower pulley combo instead of a real small upper?
Do you know at this point if the lower pulley/damper set up for CTS-V will work on the ZL1 considering the lack of belt driver p/s on the ZL1? Also as far as rwhp estimates go, my car is a manual trans if that makes a difference. What cam are you using in the yellow car? the GT9?
Cam is GT9, 8.66 lower with 2.55 upper gets you 23771 supercharger speed at 7000 engine rpm, 2.38 pulley with 8.66 gets yo 25469 sc rpm at same pointand 2.38 with 8.25 lower gets you 24274 sc rpm, we will let you know which works best soon

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