Bigger is not always better
03-17-2013, 08:18 PM
#1
Bigger is not always better 02 5.3, king bearings, arp 2000 rod bolts, arp mains (60ftlb) and ebay head studs.(65ftlb)
ls9 gaskets copper coated, hand prorted 241s, prc 650 springs, ls2 intake, 108lb injectors on e85. pt88 turbo. 4l80e/proyank, midwest chassie 9" 3.50 gear. short torque arm. umi complete tubular front end. Afco T2 DA front coil overs, and strange DA rear coil overs.
First off I had a stock 06 gto cam in this engine, put about 200miles on it getting some base tuning down got it up to 16psi and this thing would move... at our local hwy/1/4 mile the car would trap about 142ish out the back door.
I ended up cutting the filter apart and found some bearing material in it so decided to pull the engine and check it out.... basically wasted my time as it really didnt look bad at all... good enough I was going to reuse the bearings but for $70 I bought another complete set..
I had new cam just sitting there from another build I started speced for a F1r build, so while the engine was out I decided to put that cam in 239 252 623 623 114
ya that was the big waste of time again, the thing would take forever to make any boost and when it did it was 1/8 mile out, and half the time the turbo would surge its *** off and it would never make more then 3psi of boost
so last night I pulled that cam back out and the stock 204 211 525 525 116 went back in, got the base tune down today and I feel like there is 150-200hp difference at the same boost level. going with this small cam.
LIVE AND LEARN.
Just thought I would share.
ls9 gaskets copper coated, hand prorted 241s, prc 650 springs, ls2 intake, 108lb injectors on e85. pt88 turbo. 4l80e/proyank, midwest chassie 9" 3.50 gear. short torque arm. umi complete tubular front end. Afco T2 DA front coil overs, and strange DA rear coil overs.
First off I had a stock 06 gto cam in this engine, put about 200miles on it getting some base tuning down got it up to 16psi and this thing would move... at our local hwy/1/4 mile the car would trap about 142ish out the back door.
I ended up cutting the filter apart and found some bearing material in it so decided to pull the engine and check it out.... basically wasted my time as it really didnt look bad at all... good enough I was going to reuse the bearings but for $70 I bought another complete set..
I had new cam just sitting there from another build I started speced for a F1r build, so while the engine was out I decided to put that cam in 239 252 623 623 114
ya that was the big waste of time again, the thing would take forever to make any boost and when it did it was 1/8 mile out, and half the time the turbo would surge its *** off and it would never make more then 3psi of boost
so last night I pulled that cam back out and the stock 204 211 525 525 116 went back in, got the base tune down today and I feel like there is 150-200hp difference at the same boost level. going with this small cam.
LIVE AND LEARN.
Just thought I would share.
03-17-2013, 10:00 PM
#5
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yes i would that cam is a little big for that set up you dont need alot of cam when your turbo and it being 5.3 that cam is stupid big i would think about changing that cam bleeding off alot of boost
03-17-2013, 10:27 PM
#7
Yea just a tad. I use the 239 intake lobe on the nastier 6.0 and mild 400+ cube stuff alot.. BUT it gets installed on a 110 intake centerline. On the 114 the intake valve closed so late the motor wasnt buidling any static compression. The overlap that thing had was killing it too.
Ideal cam for me for your setup.... its about 230/234 on a 115+5
Use the wallace racing cam calc to convert that into actual valve events... do both cams and look at the differences.... mainly in where the intake valve closes. Post up the events and we will discuss it more mfrom there.... i could spoon feed you the answers... but i want ya to learn more about the why than just cause I said so.
Ideal cam for me for your setup.... its about 230/234 on a 115+5
Use the wallace racing cam calc to convert that into actual valve events... do both cams and look at the differences.... mainly in where the intake valve closes. Post up the events and we will discuss it more mfrom there.... i could spoon feed you the answers... but i want ya to learn more about the why than just cause I said so.
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03-18-2013, 07:33 AM
#9
HERES what i came up with.
big cam...
IVO is 5.5 ° BTDC ( - indicates ATDC)
IVC is 53.5 ° ABDC
EVO is 60.0 ° ATDC ( - indicates BTDC)
EVC is 12.0 ° BBDC
Overlap is 17.5
lil cam... that liljohn posted 230/234
IVO is 5.0 ° BTDC ( - indicates ATDC)
IVC is 45.0 ° ABDC
EVO is 57.0 ° ATDC ( - indicates BTDC)
EVC is -3.0 ° BBDC
Overlap is 2 °
STOCK 06 gto cam thats in it now.
IVO is -14.0 ° BTDC ( - indicates ATDC)
IVC is 38.0 ° ABDC
EVO is 41.5 ° ATDC ( - indicates BTDC)
EVC is -10.5 ° BBDC
Overlap is -24.5 °
big cam...
IVO is 5.5 ° BTDC ( - indicates ATDC)
IVC is 53.5 ° ABDC
EVO is 60.0 ° ATDC ( - indicates BTDC)
EVC is 12.0 ° BBDC
Overlap is 17.5
lil cam... that liljohn posted 230/234
IVO is 5.0 ° BTDC ( - indicates ATDC)
IVC is 45.0 ° ABDC
EVO is 57.0 ° ATDC ( - indicates BTDC)
EVC is -3.0 ° BBDC
Overlap is 2 °
STOCK 06 gto cam thats in it now.
IVO is -14.0 ° BTDC ( - indicates ATDC)
IVC is 38.0 ° ABDC
EVO is 41.5 ° ATDC ( - indicates BTDC)
EVC is -10.5 ° BBDC
Overlap is -24.5 °
Last edited by 9sectruck; 03-18-2013 at 08:13 AM.
03-18-2013, 07:51 AM
#10
Good post man.
You cant tell people that their cam or their turbo, etc is too big though. they wont listen. this is a lesson that people have to spend money learn.
like the guy who wants to run a 106mm turbo with a junkyard 5.3 hahaha. that cracks me up just thinking about it.
You cant tell people that their cam or their turbo, etc is too big though. they wont listen. this is a lesson that people have to spend money learn.
like the guy who wants to run a 106mm turbo with a junkyard 5.3 hahaha. that cracks me up just thinking about it.
03-18-2013, 08:18 AM
#14
wicked69 just ran a 6.07 with a 224/228 cam on a 6.0 at 3600 lbs on 10psi. and thats on a 6.0
just enjoy the cam you have. but if you decide to sell it, Ive got first dibs lol