[Z06] AFR 205's and C6Z exhaust
07-26-2014, 09:23 PM
#1
AFR 205's and C6Z exhaust - 400whp stock cam!
Hey guys.
I've got a yellow '03 z06. I've had it about a year and a half and use it as my daily driver. I've put about 25k miles on it since I've bought it.
I live in California so mods are a little tricky.
I'm getting really close to finishing up the first major mods I've done to the car.
AFR 205 heads w/ 62cc chambers
SLP 1.85 rockers (600 lift with stock cam)
Smith Bros 7.45 and 7.50 pushrods
Ls7 exhaust manifolds and cats
Corsa 3" x-pipe mated to OEM titanium axle back
K&N intake
Ported throttle body
160 thermostat and a good tune
I'm excited to hear the difference between the stock H pipe and the X pipe.
And one of the car after I plasti-dipped the lower valence.
I've got a yellow '03 z06. I've had it about a year and a half and use it as my daily driver. I've put about 25k miles on it since I've bought it.
I live in California so mods are a little tricky.
I'm getting really close to finishing up the first major mods I've done to the car.
AFR 205 heads w/ 62cc chambers
SLP 1.85 rockers (600 lift with stock cam)
Smith Bros 7.45 and 7.50 pushrods
Ls7 exhaust manifolds and cats
Corsa 3" x-pipe mated to OEM titanium axle back
K&N intake
Ported throttle body
160 thermostat and a good tune
I'm excited to hear the difference between the stock H pipe and the X pipe.
And one of the car after I plasti-dipped the lower valence.
Last edited by ls404fd; 10-30-2014 at 07:49 PM.
07-27-2014, 12:29 AM
#3
Thanks man! I will. I'm super stoked. I just looked back and I bought the c6 exhaust a year ago. Watched a sale thread on the AFR's for about 6 months and picked them up for a steal. Been thinking about this for a long time. I am thinking I may hit around 400whp and be able to trap low 120's with the stock cam.
The AFR's are badass btw. Not like they need any more promotion, but they flow just as advertised.
They flow more at 400 lift than the production heads with the same runner volume
600 lift on the intake hit a weird spot on the flow bench. No doubt that it hits just a touch over 300 cfm on the intake.
The AFR's are badass btw. Not like they need any more promotion, but they flow just as advertised.
They flow more at 400 lift than the production heads with the same runner volume
600 lift on the intake hit a weird spot on the flow bench. No doubt that it hits just a touch over 300 cfm on the intake.
Code:
Uncorrected Flow For AFR 205 Heads Intake Flow (4" bore) Exhaust Flow (no pipe) Lift (Inches) CFM Lift (Inches) CFM 100 67 100 56 150 10 150 83 200 13 200 109 250 178 250 132 300 209 300 152 350 234 350 173 400 255 400 184 450 272 450 194 500 286 500 201 550 296 550 207 600 289 600 212
07-28-2014, 02:45 AM
#6
I'm in the inland empire. I just opted to delete the air injection. That may be a sticking point later, but I don't think smog techs will look that close at a very stock appearing engine bay. Won't throw any codes and honestly not needed with the new cats being so close to the engine.
The chambers are 62cc. They're 2-3cc smaller than stock. In California we only have 91 octane so I'm glad they weren't cut any more than that. I can't remember exactly what I calculated, but I think its about 10.8:1.
I've got it together and been doing some driving today. First of all...it sounds amaaaaaazing. Its a bit higher pitched, much smoother, and has a more exotic? sound to it. Still growls like before, but has all these fun new subtle sounds it makes.
First drive on the same tune as before and it pinged pretty bad. It pulled 2-3 degrees of timing but couldn't stop the pinging. It did ping before the head swap as well so I think the K&N intake may be making it run a bit too lean. Won't be a problem after tuning.
I pulled a bunch of timing out and threw some fuel at it for now. Feels strong in the midrange but definitely not at its max potential at WOT. Only running about 16-18 degrees of timing right now. I've seen logs on the stock timing table giving it 24 degrees.
Need to get the wideband hooked up and get to work on the tune. There isn't really much to do except dial in the timing and fuel. I should be able to get it really close on the street. Maybe some small tweaks on a dyno later to get it fully dialed in.
There's a street legal drags at Fontana next weekend...maybe!
The chambers are 62cc. They're 2-3cc smaller than stock. In California we only have 91 octane so I'm glad they weren't cut any more than that. I can't remember exactly what I calculated, but I think its about 10.8:1.
I've got it together and been doing some driving today. First of all...it sounds amaaaaaazing. Its a bit higher pitched, much smoother, and has a more exotic? sound to it. Still growls like before, but has all these fun new subtle sounds it makes.
First drive on the same tune as before and it pinged pretty bad. It pulled 2-3 degrees of timing but couldn't stop the pinging. It did ping before the head swap as well so I think the K&N intake may be making it run a bit too lean. Won't be a problem after tuning.
I pulled a bunch of timing out and threw some fuel at it for now. Feels strong in the midrange but definitely not at its max potential at WOT. Only running about 16-18 degrees of timing right now. I've seen logs on the stock timing table giving it 24 degrees.
Need to get the wideband hooked up and get to work on the tune. There isn't really much to do except dial in the timing and fuel. I should be able to get it really close on the street. Maybe some small tweaks on a dyno later to get it fully dialed in.
There's a street legal drags at Fontana next weekend...maybe!
07-28-2014, 01:48 PM
#8
Race Director
You threw me with the "Inland Empire" location. 
That's what we call the area east of the Cascades, in WA. and OR. You could have passed CA smog with a lot better cam combo, than the stock with 1:85 rockers, IMO. A 224-228@114 is said to pass emissions in CA, and would have given you much better results, with stock rockers. The increased geometry is believed to increase valve/guide wear as well.
That's what we call the area east of the Cascades, in WA. and OR. You could have passed CA smog with a lot better cam combo, than the stock with 1:85 rockers, IMO. A 224-228@114 is said to pass emissions in CA, and would have given you much better results, with stock rockers. The increased geometry is believed to increase valve/guide wear as well.
07-28-2014, 02:43 PM
#9
Better is really dependent on your goals. A cam swap was never really considered. It didn't really fit my objective. I wanted more power without any indication that anything had been done to the car. That is what interests me more than just peak power results. Having a stock acting car with about 15% more power... That just seems cool to me.
Driving it around right now you can't tell it's been modified other than some slight sound changes. I'm also hoping for similar or even improved fuel economy. A more aggressive cam isn't going to give you that.
Valve guides? Well.. We'll see. The car sees about 15k miles a year lol.
Were you down for the one earlier this year?
Driving it around right now you can't tell it's been modified other than some slight sound changes. I'm also hoping for similar or even improved fuel economy. A more aggressive cam isn't going to give you that.
Valve guides? Well.. We'll see. The car sees about 15k miles a year lol.
Were you down for the one earlier this year?
07-28-2014, 04:59 PM
#10
Race Director
Better is really dependent on your goals. A cam swap was never really considered. It didn't really fit my objective. I wanted more power without any indication that anything had been done to the car. That is what interests me more than just peak power results. Having a stock acting car with about 15% more power... That just seems cool to me.
Driving it around right now you can't tell it's been modified other than some slight sound changes. I'm also hoping for similar or even improved fuel economy. A more aggressive cam isn't going to give you that.
Valve guides? Well.. We'll see. The car sees about 15k miles a year lol.
Were you down for the one earlier this year?
Driving it around right now you can't tell it's been modified other than some slight sound changes. I'm also hoping for similar or even improved fuel economy. A more aggressive cam isn't going to give you that.
Valve guides? Well.. We'll see. The car sees about 15k miles a year lol.
Were you down for the one earlier this year?
The cam I listed is barely noticeable, except when you accelerate.
08-03-2014, 08:49 PM
#12
Well I've been tuning the car all week. I've got it dialed in to 12.5 at WOT and commanding 22 degrees of timing. Its getting 21.5. I also turned off the long term fuel trims and got my MAF table dialed in. The K&N intake has been causing intermittent CEL due to LTFT being out of range. I'm +/- 3% average now cruising around in all kinds of conditions.
Only gremlins right now is that the car will go rich on decel under some conditions. I haven't pinpointed it yet. Tweaked some injector data and it may have gotten a little better. I'm not the only one who has encountered this with the GTP/ASA injectors. Maybe needs some VE table work...not sure.
I still want to get it on a dyno and make sure its pulling hard to redline. It feels and sounds good, but even with dual springs those are some really aggressive ratio rocker arms. I also don't want to butt dyno street tune for fuel. I'll keep it at 12.5 or richer for now.
Only gremlins right now is that the car will go rich on decel under some conditions. I haven't pinpointed it yet. Tweaked some injector data and it may have gotten a little better. I'm not the only one who has encountered this with the GTP/ASA injectors. Maybe needs some VE table work...not sure.
I still want to get it on a dyno and make sure its pulling hard to redline. It feels and sounds good, but even with dual springs those are some really aggressive ratio rocker arms. I also don't want to butt dyno street tune for fuel. I'll keep it at 12.5 or richer for now.
08-03-2014, 08:54 PM
#13
Had a test and tune day today at California speedway. Its known for being a very slow track. These were probably the worst conditions of the year.
I was pretty depressed until I talked with a CTS-V coupe owner who runs his car often. He couldn't go any faster than 12.9@109mph...with the supercharged 6.2L.
Turns out my tune was just about optimal pulling into the track today. I tried bumping it up to 24 degrees and didn't get any knock retard, but I didn't gain any performance. I may have heard some pinging, but its hard to tell with a helmet on.
I just drove off the line since I was mostly here for MPH. Unfortunately I don't have any baseline testing from when the car was stock. My expectations were a bit higher, but with the conditions it just wasn't there today.
Temp 85*
Humidity 55%
Baro 28.70
DA 4000 feet
I was pretty depressed until I talked with a CTS-V coupe owner who runs his car often. He couldn't go any faster than 12.9@109mph...with the supercharged 6.2L.
Turns out my tune was just about optimal pulling into the track today. I tried bumping it up to 24 degrees and didn't get any knock retard, but I didn't gain any performance. I may have heard some pinging, but its hard to tell with a helmet on.
I just drove off the line since I was mostly here for MPH. Unfortunately I don't have any baseline testing from when the car was stock. My expectations were a bit higher, but with the conditions it just wasn't there today.
Temp 85*
Humidity 55%
Baro 28.70
DA 4000 feet
08-03-2014, 09:34 PM
#14
Le Mans Master
4000' DA is pretty damn bad.. There is 2-3 mph right there from 0'. Driving it out of the hole easy will hurt the 1/8 mph, which in turn will hurt the 1/4 mph. You gained 25 mph on the back half which is what it should be doing..just the front half is soft. 2.2 60' and worse then that the 5.67 330' killed it.
I'd be willing to bet it would have gone 116-116.5 on some drag radials and a 1.80 60'. Then in good air probably 118-119. Not bad at all for stock cam, no headers and thru cats.
Fwiw, many moons ago, I went 117 mph in +500' DA, on drag radials and only a vararam. It took 5-6 passes to get that. Most were 116, not power shifting.
Get it on the Dyno and make sure the power is there, then run it again. I like the combo you have on it.
I'd be willing to bet it would have gone 116-116.5 on some drag radials and a 1.80 60'. Then in good air probably 118-119. Not bad at all for stock cam, no headers and thru cats.
Fwiw, many moons ago, I went 117 mph in +500' DA, on drag radials and only a vararam. It took 5-6 passes to get that. Most were 116, not power shifting.
Get it on the Dyno and make sure the power is there, then run it again. I like the combo you have on it.
08-04-2014, 12:44 AM
#15
Yeah I feel ya. This is my home track and we see upper 4000's DA's in the summer, but usually with 0-10% humidity. We run okay in the heat just not when the air is thicker than mud. On any given day Pomona would be .10 to .15 quicker. Sonoma .15 to .20.
On the launch I just don't want to abuse the car. I was trying to do my normal launch from the street. 2500 rpm and slip it out...tires start to slip, clutch comes out, and everything is great. On the track the VHT just kicks my ***. 2 or 3 hops and a bog is all I can get out of it at my limit of what I'm willing to put the car through. At that point I just gave up and drove out soft. I just fixed my leaking differential...really don't want to do that again!!!
I agree with your estimates. In January with a strong tail wind I think I could see 12.30's at 119 with a less pathetic 60 foot.
Really want a dyno day just to verify fueling and spark for best power and to make sure powerband is smooth and clean. Its not urgent at this point as the car runs and drives great, but it should happen all the same.
On the launch I just don't want to abuse the car. I was trying to do my normal launch from the street. 2500 rpm and slip it out...tires start to slip, clutch comes out, and everything is great. On the track the VHT just kicks my ***. 2 or 3 hops and a bog is all I can get out of it at my limit of what I'm willing to put the car through. At that point I just gave up and drove out soft. I just fixed my leaking differential...really don't want to do that again!!!
I agree with your estimates. In January with a strong tail wind I think I could see 12.30's at 119 with a less pathetic 60 foot.
Really want a dyno day just to verify fueling and spark for best power and to make sure powerband is smooth and clean. Its not urgent at this point as the car runs and drives great, but it should happen all the same.
08-21-2014, 06:51 PM
#18
Le Mans Master
Member Since: Dec 2005
Location: Port Arthur, Texas 77642
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With several mods at once it's hard to tell which part contributed how much. Has your rpm range been extended much beyond before the mods? Did you ever do a "before" dyno run?
08-21-2014, 08:02 PM
#19
Didn't dyno it stock.
I don't want to wind it out any higher than the 6600rpm cutoff stock. I would guess it is peaking around 6200. I don't really think there's a need to rev it more. Last thing I want to do after all this work is hurt it lol.
I don't want to wind it out any higher than the 6600rpm cutoff stock. I would guess it is peaking around 6200. I don't really think there's a need to rev it more. Last thing I want to do after all this work is hurt it lol.
08-24-2014, 09:44 AM
#20
Race Director
Member Since: Mar 2006
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VERY VERY NICE!!!! Gorgeous MY C5Z ripping through the gears... I say you get 