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Old 04-09-2021, 08:17 PM   #15
Dathomas94
 
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Am I missing something.... I am a first time new 2021 ZL1 owner but aren’t these supposed to have 650 hp and similar torque ?
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Old 04-09-2021, 08:20 PM   #16
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Originally Posted by Dathomas94 View Post
Am I missing something.... I am a first time new 2021 ZL1 owner but aren’t these supposed to have 650 hp and similar torque ?

Thats the power rated at the flywheel, not the wheels.


Theres about a 15% drive loss to the wheels.
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Old 04-09-2021, 10:06 PM   #17
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I don't trust the dyno results because they are done with the hood up. That allows the open element to suck air from all around the top of the open box, a much larger area, whereas, with the hood down as when the car is driving around, there's a lot more restriction and air can only come from the inlet through the grille. That is the same for the factory closed box - it's taking air in from the inlet through the grille, without the benefit of the open box/hood up scenario. That's why I think these "CAIs" might show gains on a dyno, but when the hood is down, I bet most of the gains are negated.

I'd have to see a closed hood dyno to consider this a fair comparison. That, or a couple of back to back 60-130 runs in the same conditions to really compare performance gains. Do 3 runs stock and 3 runs w/ the rotofab and average the times for a fair comparison.
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Old 04-10-2021, 07:49 AM   #18
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Quote:
Originally Posted by Idaho2018GTPremium View Post
I don't trust the dyno results because they are done with the hood up. That allows the open element to suck air from all around the top of the open box, a much larger area, whereas, with the hood down as when the car is driving around, there's a lot more restriction and air can only come from the inlet through the grille. That is the same for the factory closed box - it's taking air in from the inlet through the grille, without the benefit of the open box/hood up scenario. That's why I think these "CAIs" might show gains on a dyno, but when the hood is down, I bet most of the gains are negated.

I'd have to see a closed hood dyno to consider this a fair comparison. That, or a couple of back to back 60-130 runs in the same conditions to really compare performance gains. Do 3 runs stock and 3 runs w/ the rotofab and average the times for a fair comparison.
Not to argue your point about the hood open, because it's just one test, but RPM did a little dyno test on this and found no real difference if I recall. I'm not suggesting this single dyno is absolute, but it was a RF. At any rate...

The car will take time to learn. Logging air/fuel trims would indicate changes in the respective systems, and likely show if the car is actually processing more air. However - I bet the TM kicks in because it seems like these cars like closing the throttle around peak torque STOCK, so just adding the potential of more flow without better tuning, makes for an improved blower whine more than realizing much power potential of the CAI. If you watch and read enough dyno runs, you might come to a similar conclusion, if you haven't already. I can tell you TM and torque tuning is real and makes a difference. And it's complex, and why you pay good money for a good tuner.
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Old 04-10-2021, 08:44 AM   #19
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Originally Posted by Idaho2018GTPremium View Post
I don't trust the dyno results because they are done with the hood up. That allows the open element to suck air from all around the top of the open box, a much larger area, whereas, with the hood down as when the car is driving around, there's a lot more restriction and air can only come from the inlet through the grille. That is the same for the factory closed box - it's taking air in from the inlet through the grille, without the benefit of the open box/hood up scenario. That's why I think these "CAIs" might show gains on a dyno, but when the hood is down, I bet most of the gains are negated.

I'd have to see a closed hood dyno to consider this a fair comparison. That, or a couple of back to back 60-130 runs in the same conditions to really compare performance gains. Do 3 runs stock and 3 runs w/ the rotofab and average the times for a fair comparison.
It won't make a negligible difference with the hood open or closed.
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Old 04-10-2021, 10:48 AM   #20
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I am a little suspicious of these dyno results because it shows a very low torque reading. But, it does show a sizable gain from the roto fab, so here you go. My dyno results showed zero gain, but I am sure that when I added other mods and was tuned, the increased airflow from the rotofab probably contributed to higher dyno numbers and more usable power at that point. In any event, I think the rotofab is at least a good gateway mod to more real world power as other mods are added. It does look cool and increases blower whine. To those who noticed better dyno numbers or increased power from the rotofab alone, congrats and enjoy!
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Old 04-10-2021, 10:57 AM   #21
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Originally Posted by Z OH 6 View Post
It won't make a negligible difference with the hood open or closed.
You saying that doesn't make it true. Do you have actual data to back that statement up? 60-130 runs, closed hood dyno runs, etc.?
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Old 04-10-2021, 11:05 AM   #22
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Originally Posted by Idaho2018GTPremium View Post
You saying that doesn't make it true. Do you have actual data to back that statement up? 60-130 runs, closed hood dyno runs, etc.?
It is true, many places dynoed open/closed made no difference.

It’s amazing the amount of armchair scientists we have on this forum.

You can be the first one to do a 60-130 pull with your hood off too... funny man


Actually let me edit this...


Its possible to actually lose a bit of power with the hood open with a RF.... IF you've got no fans/airflow around the intake because IAT's would go up as its sucking in hot engine air.. Stock box is pretty much opposite of this, sealed gets air from bottom. Now of course everyone who runs a dyno uses fans, but i just wanted to throw that out there because that will be the next question asking for scientific proof. Unless you want to be like Idaho2018GTPremium and do some 60-130 pulls with hood open, that be cool too. The weakest link is pretty much the stock air filter itself, not the actual intake.



Also, the RF was designed to run with the hood down and of course moving.

Last edited by Camaro1973; 04-10-2021 at 11:27 AM.
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Old 04-10-2021, 11:07 AM   #23
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Originally Posted by Camaro1973 View Post
It is true, many places dynoed open/closed made no difference.

It’s amazing the amount of armchair scientists we have on this forum.

You can be the first one to do a 60-130 pull with your hood off too... funny man
Now that would be funny.
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Old 04-10-2021, 11:09 AM   #24
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Originally Posted by Camaro1973 View Post
It is true, many places dynoed open/closed made no difference.

It’s amazing the amount of armchair scientists we have on this forum.

You can be the first one to do a 60-130 pull with your hood off too... funny man
I never said do a 60-130 with the hood off. I said do some 60-130 runs with the stock box, then runs w/ the RF and compare times, under the same DA conditions. You're the only one that thinks I implied doing 60-130 with the hood off.
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Old 04-10-2021, 11:12 AM   #25
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yes someone post stock ZL1 60-130 so i have something to compare with.
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Old 04-10-2021, 11:20 AM   #26
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Quote:
Originally Posted by Idaho2018GTPremium View Post
I never said do a 60-130 with the hood off. I said do some 60-130 runs with the stock box, then runs w/ the RF and compare times, under the same DA conditions. You're the only one that thinks I implied doing 60-130 with the hood off.

It was a joke... Great Scott we need more plutonium.
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Old 04-10-2021, 11:33 AM   #27
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It was a joke... Great Scott we need more plutonium.
OK. It's difficult to tell just by looking at some text on a screen.
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