Z/28 Air Intake Kit - Page 8 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Camarotobeornottobe · 03-10-2015, 07:43 AM

Reference the hood closed vs. open argument, I think everyone needs to keep in mind the reason for the dyno here: We want to know the increase in HP over the stock intake.

So, keeping the hood closed will ensure each has the SAME airflow, i.e. that the air comes from whatever it can suck from the lower inlet. Underhood temps should be the same, so each is at the same advantage/disadvantage.

If you run both open hood, the Z28 is going to have an unrealistic advantage because it is going to suck from the top . . . something it can't do in real life when running the car on the street. The stock intake would not get an air inflow increase since it is closed on the top.

If we cared about doing a Z28 vs. Rotofab, then you could leave hood open for both since both would be drawing from the top.

Camarotobeornottobe · 03-10-2015, 08:09 AM

For those who have the Z28 intake, how confident are you that it seals 100% against the SS hood and hoodliner?

CreeperRS · 03-10-2015, 08:35 AM

Quote:

Originally Posted by Camarotobeornottobe

Reference the hood closed vs. open argument, I think everyone needs to keep in mind the reason for the dyno here: We want to know the increase in HP over the stock intake.

So, keeping the hood closed will ensure each has the SAME airflow, i.e. that the air comes from whatever it can suck from the lower inlet. Underhood temps should be the same, so each is at the same advantage/disadvantage.

If you run both open hood, the Z28 is going to have an unrealistic advantage because it is going to suck from the top . . . something it can't do in real life when running the car on the street. The stock intake would not get an air inflow increase since it is closed on the top.

If we cared about doing a Z28 vs. Rotofab, then you could leave hood open for both since both would be drawing from the top.

I agree! We want to know the increase in HP over the stock intake. That is the point. In this case it makes sense to keep the hood closed for a real comparison over stock.

Mikamaro · 03-10-2015, 09:07 AM

Quote:

Originally Posted by Dropspeed

The reason cars are dynoed with the hood open is that there are no public dyno facilities that can duplicate the airflow of a car at speed. Sticking 5 foot fans or multiple small fans around the car does not replicate the airflow the car will see in the real world. They also do not have variable speeds. IE when the car is at 20mph on the dyno it receives the same air from the fan as when it is at 100mph on the dyno. With that said, the hood should be open as underhood temps are not realistic with the hood closed.

hood closed or you will will never be able to compare with the oem air box.
First baseline test with oem hood close, second test Baseline with new CAi hood close.
Having fans or not will only get lower Hp/TQ numbers but the difference in % of gains or loss with be the same.

cdb95z28 · 03-10-2015, 02:19 PM

Quote:

Originally Posted by Camarotobeornottobe

For those who have the Z28 intake, how confident are you that it seals 100% against the SS hood and hoodliner?

100% confident. I wet the seal on the Z/28 CAI and closed my hood, then reopened to see the reference mark. It completely transferred the water onto the hood liner.

Camarotobeornottobe · 03-10-2015, 03:38 PM

Quote:

Originally Posted by cdb95z28

100% confident. I wet the seal on the Z/28 CAI and closed my hood, then reopened to see the reference mark. It completely transferred the water onto the hood liner.

Thanks. Had there been any question, I was thinking that it would be easy to install a piece of clear plexiglass across the top, using the ridges just inside and below the rim. Would create an effect similiar to the CAI. Might look pretty darn cool . . .

CreeperRS · 03-10-2015, 04:44 PM

Quote:

Originally Posted by cdb95z28

100% confident. I wet the seal on the Z/28 CAI and closed my hood, then reopened to see the reference mark. It completely transferred the water onto the hood liner.

Thanks for the info.

jim's2ssrs · 03-10-2015, 09:14 PM

Do you plan on recording and reporting AFR and fuel trims for the stock intake and the Z28 intake?

CreeperRS · 03-10-2015, 10:14 PM

Quote:

Originally Posted by jim's2ssrs

Do you plan on recording and reporting AFR and fuel trims for the stock intake and the Z28 intake?

I was not aware I could see fuel trims, sounds interesting. How can I do it?

Nick S · 03-11-2015, 07:29 AM

Fuel trims can be scanned and logged using any of the full tuning packages like HP Tuners or EFI Live. I would think the Dyno shop you are taking the car to would have a scanner that could log fuel trims.

An important note though since your dyno run will likely be done at full throttle the ECM will ignore fuel trims anyhow so I'm not sure what good it does to log fuel trims at WOT. At WOT the car goes into open loop anyhow with fuel enrichment. The wideband O2 sensor would be the most valuable tool for monitoring any fueling affects the new intake has on the engine.

For AFR you would need to use the wideband O2 sensor that the dyno shop should also have available if they do any tuning at all.

Mgizzle · 03-11-2015, 07:43 PM

Quote:

Originally Posted by cdb95z28

100% confident. I wet the seal on the Z/28 CAI and closed my hood, then reopened to see the reference mark. It completely transferred the water onto the hood liner.

Dang, didnt think about this I removed my hood liner.

CreeperRS · 03-11-2015, 07:55 PM

Quote:

Originally Posted by Nick S

Fuel trims can be scanned and logged using any of the full tuning packages like HP Tuners or EFI Live. I would think the Dyno shop you are taking the car to would have a scanner that could log fuel trims.

An important note though since your dyno run will likely be done at full throttle the ECM will ignore fuel trims anyhow so I'm not sure what good it does to log fuel trims at WOT. At WOT the car goes into open loop anyhow with fuel enrichment. The wideband O2 sensor would be the most valuable tool for monitoring any fueling affects the new intake has on the engine.

For AFR you would need to use the wideband O2 sensor that the dyno shop should also have available if they do any tuning at all.

Will check with them the day of. They should, they tune cars all the time. After all it is JBA.

CreeperRS · 03-11-2015, 07:56 PM

Quote:

Originally Posted by Mgizzle

Dang, didnt think about this I removed my hood liner.

DOH!

jshaf · 03-11-2015, 09:39 PM

been reading through this thread and I have this intake setting in my garage and plan on installing it tomorrow afternoon. since I don't have the Oil separator on my L99 then I don't need any extra parts like the 1LE folks right? no need to buy anything extra?

03-11-2015, 07:29 AM	#108
Nick S Drives: 2013 Camaro 1LE Join Date: Jul 2012 Location: Verona, WI Posts: 1,932	Fuel trims can be scanned and logged using any of the full tuning packages like HP Tuners or EFI Live. I would think the Dyno shop you are taking the car to would have a scanner that could log fuel trims. An important note though since your dyno run will likely be done at full throttle the ECM will ignore fuel trims anyhow so I'm not sure what good it does to log fuel trims at WOT. At WOT the car goes into open loop anyhow with fuel enrichment. The wideband O2 sensor would be the most valuable tool for monitoring any fueling affects the new intake has on the engine. For AFR you would need to use the wideband O2 sensor that the dyno shop should also have available if they do any tuning at all. __________________

03-11-2015, 09:39 PM	#112
jshaf Montani Semper Liberi Drives: 2011 Black 2SS/RS w/ IOM stripes Join Date: Feb 2010 Location: Masontown, WV Posts: 4,841	been reading through this thread and I have this intake setting in my garage and plan on installing it tomorrow afternoon. since I don't have the Oil separator on my L99 then I don't need any extra parts like the 1LE folks right? no need to buy anything extra? __________________ Stainless Works 1 7/8 Long Tude Headers, Stainless Works High Flow Cats, Stainless Works Retro Chambered Catback, Z/28 Air Intake, RDP Tuned, FR41 Chrome Rims, 1100W stereo, 35% Tint

03-10-2015, 07:43 AM	#99
Camarotobeornottobe Drives: 1LE Join Date: Feb 2013 Location: East Coast Man Posts: 550	Reference the hood closed vs. open argument, I think everyone needs to keep in mind the reason for the dyno here: We want to know the increase in HP over the stock intake. So, keeping the hood closed will ensure each has the SAME airflow, i.e. that the air comes from whatever it can suck from the lower inlet. Underhood temps should be the same, so each is at the same advantage/disadvantage. If you run both open hood, the Z28 is going to have an unrealistic advantage because it is going to suck from the top . . . something it can't do in real life when running the car on the street. The stock intake would not get an air inflow increase since it is closed on the top. If we cared about doing a Z28 vs. Rotofab, then you could leave hood open for both since both would be drawing from the top.

03-10-2015, 08:09 AM	#100
Camarotobeornottobe Drives: 1LE Join Date: Feb 2013 Location: East Coast Man Posts: 550	For those who have the Z28 intake, how confident are you that it seals 100% against the SS hood and hoodliner?

03-10-2015, 09:14 PM	#106
jim's2ssrs Drives: 2011 2SS RS LS3 Rally Yellow Join Date: Jan 2011 Location: Ottawa, KS Posts: 32	Do you plan on recording and reporting AFR and fuel trims for the stock intake and the Z28 intake?