quick boost calculation question - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

bigassogre · 07-07-2015, 02:22 PM

ok, so im gettin ready to buy a metco balancer with a 10" pulley which is supposed to yield a +5.5 increase in boost, im also going to be doing a set of 2" primary headers and 3" exhaust probably with slp lm2 mufflers. ive read that when you do headers and delete the cats you will have a little loss of boost, so my question is how much boost ahould i expect total when adding a 10" crank pulley and headers at the same time? any help would be greatly appreciated.

mrvenicess · 07-07-2015, 04:01 PM

You will probably lose 1 lb of boost with the headers and exhaust so you should have a net increase of 4.5 lbs.

crazydave · 07-07-2015, 04:20 PM

I have a hair under 13lbs with a 9.55",LTs no cats for comparison.

Stephen12ZL1 · 07-07-2015, 05:45 PM

14ish is my guess

bigassogre · 07-07-2015, 08:45 PM

thanks guys, i appreciate the input. i didnt really want the 10" pulley, i wanted a 9.1", but i got such a smokin deal that i couldnt pass it up!

mrvenicess · 07-08-2015, 08:57 AM

I have a 2.55 upper and a 9.55 lower. With ported heads and blower plus cam and headers we are making 15.4 lbs of boost.

JANNETTYRACING · 07-08-2015, 01:11 PM

Quote:

Originally Posted by bigassogre

ok, so im gettin ready to buy a metco balancer with a 10" pulley which is supposed to yield a +5.5 increase in boost, im also going to be doing a set of 2" primary headers and 3" exhaust probably with slp lm2 mufflers. ive read that when you do headers and delete the cats you will have a little loss of boost, so my question is how much boost ahould i expect total when adding a 10" crank pulley and headers at the same time? any help would be greatly appreciated.

You didn't mention anything about injectors, You will need ID-850s to support any pulleys larger than 8.86

You will lose about 1 psi boost from stock manifolds and cat to LT headers and off road pipes.

Ted.

bigassogre · 07-10-2015, 03:11 PM

Quote:

Originally Posted by JANNETTYRACING

You didn't mention anything about injectors, You will need ID-850s to support any pulleys larger than 8.86

You will lose about 1 psi boost from stock manifolds and cat to LT headers and off road pipes.

Ted.

thanks for the input Ted. im planning on probably getting id1000s or something similar due to me having several other parts stashed back. my initial setup will be:
102mm tb/ported snout and blower
4.5" intake
brian tooley stage 2 positive diplacement blower cam
brian tooley springs/titanium retainers
probably texas speed 2" primary headers
3" xpipe and custom stainless exhaust
2.5" metco upper pulley, metco balancer 9.1" pulley
and im workin on a custom heat exchanger cooling system.
car will be dyno tuned by tick performance i guess since theyre closest

anybody have a guess on dyno numbers?

Emvici · 07-10-2015, 05:00 PM

I only have an upper 2.55 pulley and I am making 15 lbs of boost. I have some other small mods, but I don't think they are directly contributing to the boost. I was only making about 12.5 lbs of boost until I did a simple Modification I heard about on here; it took only 10 minutes and I gain nearly 3lbs of boost. I don't know how to find the post, or I would include the link, but it a mod. you do to the boost shut off valve. there is a stop plate that allow boost to bleed by and it comes from the factory with a small gap, if you close the gap, of the boost stop plate you will get some easy fast boost gains. someone else on here will know what I am talking about. glta.

WSSICK · 07-10-2015, 05:21 PM

Is this the mod you were referring to?

http://www.camaro5.com/forums/showth...ght=Free+Boost

bigassogre · 07-10-2015, 06:04 PM

yea ive read about this mod, just havent done it yet

Emvici · 07-12-2015, 01:50 PM

yes that is the Modification I was talking about. I am not a mechanic, and I did it myself in 10 minutes with nothing other than a 10mm socket. I spend a lot of cash to get 3 lbs of boost between upper pulley and injectors, and to think you can get 2-3 lbs of boost in under 10 minutes for Free!!. Seriously the first mod everyone should do, because apparently this setting almost never comes correctly adjusted from the factory.

07-07-2015, 02:22 PM	#1
bigassogre Drives: 13 blue ray zl1 Join Date: Apr 2015 Location: United States Posts: 82	quick boost calculation question ok, so im gettin ready to buy a metco balancer with a 10" pulley which is supposed to yield a +5.5 increase in boost, im also going to be doing a set of 2" primary headers and 3" exhaust probably with slp lm2 mufflers. ive read that when you do headers and delete the cats you will have a little loss of boost, so my question is how much boost ahould i expect total when adding a 10" crank pulley and headers at the same time? any help would be greatly appreciated. __________________ stock for now blue ray 13 zl1 m6 04 cts-v. cammed, headers, exhaust, intake, suspension 92 lexus sc300. singled 2jzgte swapped 07 tbss basically stock 00 built z28. 520 rwhp, 5.7, no power adders

07-07-2015, 05:45 PM	#4
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,824	14ish is my guess __________________ '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)

07-07-2015, 08:45 PM	#5
bigassogre Drives: 13 blue ray zl1 Join Date: Apr 2015 Location: United States Posts: 82	thanks guys, i appreciate the input. i didnt really want the 10" pulley, i wanted a 9.1", but i got such a smokin deal that i couldnt pass it up! __________________ stock for now blue ray 13 zl1 m6 04 cts-v. cammed, headers, exhaust, intake, suspension 92 lexus sc300. singled 2jzgte swapped 07 tbss basically stock 00 built z28. 520 rwhp, 5.7, no power adders

07-10-2015, 05:21 PM	#10
WSSICK Drives: 2014 Red Hot ZL1 Join Date: Jan 2010 Location: Arizona Posts: 147	Is this the mod you were referring to? http://www.camaro5.com/forums/showth...ght=Free+Boost __________________ *2014 Red Hot Camaro ZL1* 2002 Victory Red Trans Am WS6 2000 Lt Pewter Metallic Silverado Z71 1996 Metallic Gray Ford Taurus GL Last edited by WSSICK; 07-10-2015 at 08:16 PM.

07-10-2015, 06:04 PM	#11
bigassogre Drives: 13 blue ray zl1 Join Date: Apr 2015 Location: United States Posts: 82	yea ive read about this mod, just havent done it yet __________________ stock for now blue ray 13 zl1 m6 04 cts-v. cammed, headers, exhaust, intake, suspension 92 lexus sc300. singled 2jzgte swapped 07 tbss basically stock 00 built z28. 520 rwhp, 5.7, no power adders

07-07-2015, 04:01 PM	#2
mrvenicess Drives: 2013 CRT ZL1 auto Join Date: May 2010 Location: Venice Fl Posts: 1,443 View My Garage	You will probably lose 1 lb of boost with the headers and exhaust so you should have a net increase of 4.5 lbs.

07-07-2015, 04:20 PM	#3
crazydave Drives: 2013 Camaro ZL1 M6 Join Date: Jun 2012 Location: Belleville, Il Posts: 270 View My Garage	I have a hair under 13lbs with a 9.55",LTs no cats for comparison.

07-08-2015, 08:57 AM	#6
mrvenicess Drives: 2013 CRT ZL1 auto Join Date: May 2010 Location: Venice Fl Posts: 1,443 View My Garage	I have a 2.55 upper and a 9.55 lower. With ported heads and blower plus cam and headers we are making 15.4 lbs of boost.

07-10-2015, 05:00 PM	#9
Emvici Drives: 2014 ZL1 White Convertible Join Date: Aug 2013 Location: St Pete Fl Posts: 682	I only have an upper 2.55 pulley and I am making 15 lbs of boost. I have some other small mods, but I don't think they are directly contributing to the boost. I was only making about 12.5 lbs of boost until I did a simple Modification I heard about on here; it took only 10 minutes and I gain nearly 3lbs of boost. I don't know how to find the post, or I would include the link, but it a mod. you do to the boost shut off valve. there is a stop plate that allow boost to bleed by and it comes from the factory with a small gap, if you close the gap, of the boost stop plate you will get some easy fast boost gains. someone else on here will know what I am talking about. glta.

07-12-2015, 01:50 PM	#12
Emvici Drives: 2014 ZL1 White Convertible Join Date: Aug 2013 Location: St Pete Fl Posts: 682	yes that is the Modification I was talking about. I am not a mechanic, and I did it myself in 10 minutes with nothing other than a 10mm socket. I spend a lot of cash to get 3 lbs of boost between upper pulley and injectors, and to think you can get 2-3 lbs of boost in under 10 minutes for Free!!. Seriously the first mod everyone should do, because apparently this setting almost never comes correctly adjusted from the factory.