4.8l gt45 ls9 cam to triple 12 cam change what a difference!
Thread Starter
Staging Lane
Joined: Mar 2007
Posts: 52
Likes: 0
4.8l gt45 ls9 cam to triple 12 cam change what a difference! just swapped cams in my 4.8l gt45 wrangler from a ls9 to a triple 12 from stock48
what a difference!
way more driveable out of boost, spools faster, pulls harder
before traction was a slight issue
now it is >THE< issue
vehicle specs
2003 jeep wrangler body/ wheelbase stretched 15"
2009 4.8l 4l80e circle d billet single disc 3400,gt45,e85
3.73 gears 33 x 12.5 Firestone destination a/t tires (hooked surprisingly well before the cam change probably due to turbo lag)
ran a 11.99 @ 119mph last fall on the ls9 cam
have not made it to the track yet with the triple 12
i highly recommend a triple 12 cam on a turbo 4.8l
what a difference!
way more driveable out of boost, spools faster, pulls harder
before traction was a slight issue
now it is >THE< issue
vehicle specs
2003 jeep wrangler body/ wheelbase stretched 15"
2009 4.8l 4l80e circle d billet single disc 3400,gt45,e85
3.73 gears 33 x 12.5 Firestone destination a/t tires (hooked surprisingly well before the cam change probably due to turbo lag)
ran a 11.99 @ 119mph last fall on the ls9 cam
have not made it to the track yet with the triple 12
i highly recommend a triple 12 cam on a turbo 4.8l
On The Tree
Joined: Oct 2012
Posts: 171
Likes: 9
I also went from a stock cam like matt did and the change was huge. The driveability is the main thing though it is night and day different around town as far as spool and out of boost power. So happy i went with the jfr cam.
Teching In
Joined: Sep 2015
Posts: 4
Likes: 0
Yea On my 20k mile gen iv 4.8 the ls9 cam dot to dot only had 135psi cranking compresson(5-7% leakdown so motors fine) and was a dog pre boost and slow to spool. Changed cam and went to 175 cranking and soooo much better all around.
Thread Starter
Staging Lane
Joined: Mar 2007
Posts: 52
Likes: 0
here are a few pic's of the jeep in case anybody is interested
shown finished and a couple in progress
note that i stretched the body/frame/wheelbase by 15 inches (you can see the tub in 2 pieces in the in progress)
shown finished and a couple in progress
note that i stretched the body/frame/wheelbase by 15 inches (you can see the tub in 2 pieces in the in progress)
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Just curious, what kind of RPM were you turning with the LS9 cam? I ran both as well on a 5.3 and had similar results. The triple 12 really wakes up the lower RPM on the smaller LS engines.
That said, I don't think many people rev the 4.8/LS9 combo's high enough. Loose converter and LS9 revving to 7400 or so would be a great setup I'd think. My LS9 cam really picked up at 6k+. More so than the trip 12 I think.
That said, I don't think many people rev the 4.8/LS9 combo's high enough. Loose converter and LS9 revving to 7400 or so would be a great setup I'd think. My LS9 cam really picked up at 6k+. More so than the trip 12 I think.
Last edited by Forcefed86; Jun 11, 2016 at 10:47 PM.
Thread Starter
Staging Lane
Joined: Mar 2007
Posts: 52
Likes: 0
jeep has 4l80e/np231 transfer case customer driveshaft w/1310 solid trunion u-joints and a 31 spline 8.8 explorer rear axle with a Artec truss kit (truss kit is the embodiment of the word "stout" )
was running 6900-7100 wot shifts with the ls9 cam
the powerband used to start at 4500 rpm
now the powerband seems to be everywhere
having to re-do my shift points now as it hits the rev limiter (7200) while shifting with the tires broke loose
the next step is to wire in a electronic boost controller that references front wheel speed (using an abs sensor) so i can limit the boost(hp) to the max that the tires can handle
right now i can achieve wheel/tire spin at 45+ mph on a wot kickdown
was running 6900-7100 wot shifts with the ls9 cam
the powerband used to start at 4500 rpm
now the powerband seems to be everywhere
having to re-do my shift points now as it hits the rev limiter (7200) while shifting with the tires broke loose
the next step is to wire in a electronic boost controller that references front wheel speed (using an abs sensor) so i can limit the boost(hp) to the max that the tires can handle
right now i can achieve wheel/tire spin at 45+ mph on a wot kickdown
TECH Fanatic
Joined: Oct 2015
Posts: 1,280
Likes: 28
From: Pittsboro, IN
I have only had my 4.8/LS9 cam combo up to 6800 or so. It doesn't do much below 4000 RPM but as soon as it hits boost it pulls pretty strong until I want to shift. My converter is probably a bit tight.
This is with the 83mm S475.
This is with the 83mm S475.
