Turbo Upgrade????
Dec 1, 2009 | 08:22 PM
#12
The next step up for you with your current kit is probably a PT88. But I think your biggest problem is that cam. I think that's what's really hurting you since it has 1 degree of overlap and a 6 degree exhaust bias. Before you go switching turbos I would put in a 220/220 114 cam and see what it does. That turbo should be good to 700-750 rwhp on a 6.0.
So you think it is wrong?
Dec 1, 2009 | 08:37 PM
#13
Do a google search and try to do some reading on it. I did this a couple days ago and learned a lot in just 15 minutes. You can also search this site about turbo cams and what has and hasn't worked for people. A 215/215 114 is working wonders for Stock48 and his 6.0 with tc76. He made low 700 something to the wheels and is running 10s with that cam. 01Thunder felt his 220/220 cam was too big in his turbo 408. Parish also felt his 234/232 was too big in his turbo 408. Personally, I'm just boggled that someone would spec a cam of those specs to someone with a 4500 lb truck. In my reading I found the quote that is it VERY hard to beat a stock cam for turbo'd setups. Why? Because stock cams have very small amounts of overlap - the time the exhaust and intake valves are open simultaneously. For example a factory Z06 cam (very popular for FI) has somewhere around -24 degrees of overlap. Your cam has +1 degrees of overlap. That overlap is bleeding off your cylinder pressure you are generating. You also have to take into account how restrictive (or not) your exhaust is leading up to the turbo. Log manifolds are more restrictive than tubular headers, so a reverse split cam with 6 degrees of intake bias i.e. 220/114 will help. With the ideal setup, a single pattern camshaft is usually preferred i.e. 215/215.
So, in sum, I'd say if you'd be comfortable trying a different cam that may be a better first step than changing your entire setup. 580 rwhp out of a tc78 on a 6.0 seems very low given what I've seen similar setups on this website and others.
So, in sum, I'd say if you'd be comfortable trying a different cam that may be a better first step than changing your entire setup. 580 rwhp out of a tc78 on a 6.0 seems very low given what I've seen similar setups on this website and others.
Dec 1, 2009 | 08:55 PM
#14
GMCtrk- i think you won the essay post of 2009...lol, u might change you cam. im running the same 228-232, it made great power on the radix and the turbo...370 and 408...hell it made good power in on the nitrous setup...lol, but i did not pick it. call up texas speed talk to john and hell tell you whats up...
Dec 1, 2009 | 09:14 PM
#16
Do a google search and try to do some reading on it. I did this a couple days ago and learned a lot in just 15 minutes. You can also search this site about turbo cams and what has and hasn't worked for people. A 215/215 114 is working wonders for Stock48 and his 6.0 with tc76. He made low 700 something to the wheels and is running 10s with that cam. 01Thunder felt his 220/220 cam was too big in his turbo 408. Parish also felt his 234/232 was too big in his turbo 408. Personally, I'm just boggled that someone would spec a cam of those specs to someone with a 4500 lb truck. In my reading I found the quote that is it VERY hard to beat a stock cam for turbo'd setups. Why? Because stock cams have very small amounts of overlap - the time the exhaust and intake valves are open simultaneously. For example a factory Z06 cam (very popular for FI) has somewhere around -24 degrees of overlap. Your cam has +1 degrees of overlap. That overlap is bleeding off your cylinder pressure you are generating. You also have to take into account how restrictive (or not) your exhaust is leading up to the turbo. Log manifolds are more restrictive than tubular headers, so a reverse split cam with 6 degrees of intake bias i.e. 220/114 will help. With the ideal setup, a single pattern camshaft is usually preferred i.e. 215/215.
So, in sum, I'd say if you'd be comfortable trying a different cam that may be a better first step than changing your entire setup. 580 rwhp out of a tc78 on a 6.0 seems very low given what I've seen similar setups on this website and others.
So, in sum, I'd say if you'd be comfortable trying a different cam that may be a better first step than changing your entire setup. 580 rwhp out of a tc78 on a 6.0 seems very low given what I've seen similar setups on this website and others.
Also remember, 582 was on 13 psi and 15deg, I wonder what 2 more degs would of done
Dec 3, 2009 | 08:38 AM
#20