Lower pulley 18% vs 23% - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Travis104 · 02-05-2016, 05:43 PM

Hello,
Getting ready to do some mods to the car, and I am struggling with which to go with. I have read a bunch of threads regarding the 2 and some reccomend the 18%, while many others go with the 23%. I have not had the car on a road course, but would like to at some point, but it's more likely to see a drag strip, and some autox action. Here is a list of the mods I have/planned.

CAI
Kooks LT 1 7/8 catless
Rotofab I/C Reservoir
ID850
New plugs and wires
Possibly 90mm throttle body
Dyno tune after mods

Any help with one way or the other would be great. Also, on the ligenfelter chart, it shows that you don't need an idler relocation for the 18% lower, then on the next line it shows you need one? Which is correct?

Thanks,
Travis

Harley01 · 02-06-2016, 06:08 PM

Travis,

If your going to run an 18% remember to get the Id850 injectors or it will run too lean and damage your motor. I had an 18% on mine with almost the same mods you have listed and was told by Ted Jennetty (one of the very best tuners on this forum) that without a cam anything bigger would not be beneficial. Now when you go to a cam with the mods you are planning a lot of guys change the top pulley to a 2.5" with either a 10% or 18 % lower pulley. Check this chart out and note the goal is not to exceed 23000 RPM on the supercharger pulley. And remember that boost is a restriction reference and does not necessarily correlate to more power. You do need the re-location bracket with and 18% lower pulley, however if you change your supercharger pulley to a 2.5" use the relocation bracket to assist in more wrap around the pulley. If you go to the 23% you will need it for sure because your idler pulley located just above the crank pulley at the 11 o'clock position will have to be moved up a little because of the size of the 9.55 (23%) crank pulley. Hope this helps. There's a lot of guys on here who really know there stuff so comb the threads for more info!!

http://www.lingenfelter.com/PRI2014s...heet%201.1.pdf

Sepulvadoss · 02-07-2016, 09:18 AM

I just emailed Jannety and he said that you just need a 50mm idler pulley and it will allow you to install the 9.55 pulley. Didn't meant ion anything about a relocation bracket.

JANNETTYRACING · 02-08-2016, 09:04 AM

Quote:

Originally Posted by Travis104

Hello,
Getting ready to do some mods to the car, and I am struggling with which to go with. I have read a bunch of threads regarding the 2 and some reccomend the 18%, while many others go with the 23%. I have not had the car on a road course, but would like to at some point, but it's more likely to see a drag strip, and some autox action. Here is a list of the mods I have/planned.

CAI
Kooks LT 1 7/8 catless
Rotofab I/C Reservoir
ID850
New plugs and wires
Possibly 90mm throttle body
Dyno tune after mods

Any help with one way or the other would be great. Also, on the ligenfelter chart, it shows that you don't need an idler relocation for the 18% lower, then on the next line it shows you need one? Which is correct?

Thanks,
Travis

Hello Travis, I recommend the 18% with your mods.

When you move to a cam you will go with the 23% pulley.

Ideally you want to keep IAT to a minimum and not exceed the knock threshold of your octane.

Especially in a road coarse situation.

My 125 RWHP package is what I run on my ZL-1 on the road coarse, it uses the 18% pulley.

Ted.

Travis104 · 02-08-2016, 05:38 PM

Would the 23% lower pulley have any adverse effects, and would it provide more power for a drag racing/autox car? I don't plan to do any road racing with it. My biggest concern was not being able to get it to run on 93 octane.

Stephen12ZL1 · 02-09-2016, 08:27 AM

23% (9.55") for drag racing will not have any adverse effects with the appropriate tune, Travis. I will call you. For road racing, 23% is too much as I tried it at VIR. 93 octane is not an issue and the tune can be easily adjusted for the extra boost. Honestly, if you are road racing with the stock cam, 5-10% is about all that should be used after my experimentation. This is with an upgraded radiator and heat exchanger with reservoir.

Travis104 · 02-09-2016, 10:27 AM

So I may be better off going with the 18% since I would like to autox it and drag race. I plan on a cam a 2.55 upper maybe next year.

JANNETTYRACING · 02-09-2016, 10:29 AM

Quote:

Originally Posted by Travis104

So I may be better off going with the 18% since I would like to autox it and drag race. I plan on a cam a 2.55 upper maybe next year.

Yes and No.

22.5 or 28% next year with cam.

Ted.

Stephen12ZL1 · 02-09-2016, 04:34 PM

Quote:

Originally Posted by JANNETTYRACING

Yes and No.

22.5 or 28% next year with cam.

Ted.

agree 100%

rjs2010SS · 03-08-2016, 06:59 AM

I ran the 23% without a cam for a few months, no issues. But once the cam comes in NIGHT AND DAY! Good luck, The people chiming in know what they are talking about. I have dealt with Ted on many occassions and have nothing but good things to say!

Travis104 · 03-24-2016, 11:42 PM

Would a BAP be needed for my mod list above?

nighttowl · 03-25-2016, 03:11 PM

I would say yes; my car with 10%, ID850's and stock pump shows that fuel pressure starts to drop around 5500 RPM, but not enough that I need to worry.
HP tuners is a great tool to keep an eye on these cars.

02-05-2016, 05:43 PM	#1
Travis104 Drives: 2014 ZL1 Join Date: Sep 2012 Location: West Virginia Posts: 591	Lower pulley 18% vs 23% Hello, Getting ready to do some mods to the car, and I am struggling with which to go with. I have read a bunch of threads regarding the 2 and some reccomend the 18%, while many others go with the 23%. I have not had the car on a road course, but would like to at some point, but it's more likely to see a drag strip, and some autox action. Here is a list of the mods I have/planned. CAI Kooks LT 1 7/8 catless Rotofab I/C Reservoir ID850 New plugs and wires Possibly 90mm throttle body Dyno tune after mods Any help with one way or the other would be great. Also, on the ligenfelter chart, it shows that you don't need an idler relocation for the 18% lower, then on the next line it shows you need one? Which is correct? Thanks, Travis Last edited by Travis104; 02-05-2016 at 05:54 PM.

02-06-2016, 06:08 PM	#2
Harley01 Drives: 2015 Camaro ZL1 (red hot) Join Date: Dec 2014 Location: Troy, Idaho Posts: 91	Travis, If your going to run an 18% remember to get the Id850 injectors or it will run too lean and damage your motor. I had an 18% on mine with almost the same mods you have listed and was told by Ted Jennetty (one of the very best tuners on this forum) that without a cam anything bigger would not be beneficial. Now when you go to a cam with the mods you are planning a lot of guys change the top pulley to a 2.5" with either a 10% or 18 % lower pulley. Check this chart out and note the goal is not to exceed 23000 RPM on the supercharger pulley. And remember that boost is a restriction reference and does not necessarily correlate to more power. You do need the re-location bracket with and 18% lower pulley, however if you change your supercharger pulley to a 2.5" use the relocation bracket to assist in more wrap around the pulley. If you go to the 23% you will need it for sure because your idler pulley located just above the crank pulley at the 11 o'clock position will have to be moved up a little because of the size of the 9.55 (23%) crank pulley. Hope this helps. There's a lot of guys on here who really know there stuff so comb the threads for more info!! http://www.lingenfelter.com/PRI2014s...heet%201.1.pdf Last edited by Harley01; 02-06-2016 at 10:46 PM.

02-09-2016, 08:27 AM	#6
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,824	23% (9.55") for drag racing will not have any adverse effects with the appropriate tune, Travis. I will call you. For road racing, 23% is too much as I tried it at VIR. 93 octane is not an issue and the tune can be easily adjusted for the extra boost. Honestly, if you are road racing with the stock cam, 5-10% is about all that should be used after my experimentation. This is with an upgraded radiator and heat exchanger with reservoir. __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

03-08-2016, 06:59 AM	#10
rjs2010SS Drives: 2013 AGM ZL1 BELLA* Join Date: Jan 2011 Location: VA Posts: 370	I ran the 23% without a cam for a few months, no issues. But once the cam comes in NIGHT AND DAY! Good luck, The people chiming in know what they are talking about. I have dealt with Ted on many occassions and have nothing but good things to say! __________________ Roto Fab CAI, Roto Fab Big Gulp, Jokerz ported SC/Snout, LS7 TB ported, ATI Balancer, 28%(10") Lower Pulley, 2" Headers, No Cats,Forza 3way, E85 Flex Fuel sensor , ID850 injectors,, BTR Stage 3, Ron Davis HX, Mighty Mouse CC, APR Splitter, Aero Sports Concepts Splitter Kit, Showstoppers CarbonFiber wicker bill, MRR Wheels. 720rwhp/690tq on 93, 762rwhp E85. 2013 AGM ZL1 Bella* 2010 MGM Toyota Tacoma 2010 CGM SS (Traded) 1996 Black SS (Sold)

03-25-2016, 03:11 PM	#12
nighttowl Sarcasm loading -------- Drives: 2018 ZL1 1LE Join Date: Dec 2011 Location: TX Posts: 1,913 View My Garage	I would say yes; my car with 10%, ID850's and stock pump shows that fuel pressure starts to drop around 5500 RPM, but not enough that I need to worry. HP tuners is a great tool to keep an eye on these cars. __________________ "The salesman actually told me to stop getting it sideways during the test drive" 2018 MBM ZL1 1LE - 652 rwhp, 588 rwtq SAE 2014 CRT ZL1 574 rwhp, 537 rwtq - SOLD 2010 IBM SS Camaro VVT L99 w/ TR6060 swap, 489 rwhp, 444 rwtq - SOLD

02-07-2016, 09:18 AM	#3
Sepulvadoss Drives: 2013 zl1 a6 Join Date: Aug 2012 Location: Louisiana Posts: 47	I just emailed Jannety and he said that you just need a 50mm idler pulley and it will allow you to install the 9.55 pulley. Didn't meant ion anything about a relocation bracket.

02-08-2016, 05:38 PM	#5
Travis104 Drives: 2014 ZL1 Join Date: Sep 2012 Location: West Virginia Posts: 591	Would the 23% lower pulley have any adverse effects, and would it provide more power for a drag racing/autox car? I don't plan to do any road racing with it. My biggest concern was not being able to get it to run on 93 octane.

02-09-2016, 10:27 AM	#7
Travis104 Drives: 2014 ZL1 Join Date: Sep 2012 Location: West Virginia Posts: 591	So I may be better off going with the 18% since I would like to autox it and drag race. I plan on a cam a 2.55 upper maybe next year.

03-24-2016, 11:42 PM	#11
Travis104 Drives: 2014 ZL1 Join Date: Sep 2012 Location: West Virginia Posts: 591	Would a BAP be needed for my mod list above?