LS4 / F40 swap - fieroguru (Page 33/216) dobey SEP 19, 08:25 AM quote Originally posted by fieroguru: DoD lifters are stock, but the springs came with the cam kit. Remember, this cam was specifically designed for DoD engines, so the lifters should last a while, especially since it will start out with the lifters locked until I can get DoD to work with the manual. The other LS4 guy running the same cam in his DD with functional DoD hasn't had any lifter issues and he is nearing 2 years since his install. But yes, the DoD lifters are definitely the weak link. Once the thing is running I am planning to do some MPG comparisons and see what benefit DoD has for my application. Depending on what that shows me, I might purge the DoD hardware and upgrade to the VVT hardware and play with it. Right. But the GP guy is also still on the 4t65e, and I'm not sure the programming in that combination will let him go past 6000. The lifters get weak at just over 6000, around 6200, and you had mentioned wanting to rev past that before. That's why I mentioned it as the only real issue I see with your setup. I haven't seen any dyno results of his GP either. Does anyone know what the HP/TQ gains are with only that cam in a stock LS4? You've got the benefits of having the LS7 headers, LS2 intake, and aluminum flywheel with the F40, so should be able to put down more WHP than that GP does anyway, since he's basically stock+cam. iluvsd619 SEP 19, 10:52 AM Thank you for the info Fieroguru. That is some nice power! fieroguru SEP 19, 11:06 AM quote Originally posted by dobey: Right. But the GP guy is also still on the 4t65e, and I'm not sure the programming in that combination will let him go past 6000. The lifters get weak at just over 6000, around 6200, and you had mentioned wanting to rev past that before. That's why I mentioned it as the only real issue I see with your setup. I haven't seen any dyno results of his GP either. Does anyone know what the HP/TQ gains are with only that cam in a stock LS4? You've got the benefits of having the LS7 headers, LS2 intake, and aluminum flywheel with the F40, so should be able to put down more WHP than that GP does anyway, since he's basically stock+cam. He has upgraded to something in the 3.6x range of final drives, bumped his rev limiter, and taken the engine up to 7K rpm... it was what started the whole discussion about the installed intake centerline being way too retarded (pun intended). He also was running the LS1 intake and either ported manifolds or DT headers. If all one did was install the cam with an otherwise stock LS4... probably would be a dog. The cam will give up lowend TQ to make upper RPM power, but the LS4 intake/exhaust will be a significant restriction to any upper RPM power increases... The key to the cam swap on the LS4 is to improve the intake and exhaust flow at the same time. dobey SEP 19, 12:28 PM quote Originally posted by fieroguru: He has upgraded to something in the 3.6x range of final drives, bumped his rev limiter, and taken the engine up to 7K rpm... it was what started the whole discussion about the installed intake centerline being way too retarded (pun intended). He also was running the LS1 intake and either ported manifolds or DT headers. If all one did was install the cam with an otherwise stock LS4... probably would be a dog. The cam will give up lowend TQ to make upper RPM power, but the LS4 intake/exhaust will be a significant restriction to any upper RPM power increases... The key to the cam swap on the LS4 is to improve the intake and exhaust flow at the same time. OK. I'd be very interested to know what his TQ/HP curves look like on the dyno then. If he's revving to 7K consistently, I'd also be very surprised he hasn't blown a lifter or 8. I skimmed through his thread looking for the important bits, but didn't see any dyno numbers anywhere. Do you know if he ever got it dynoed? Rickady88GT SEP 22, 02:18 PM quote Originally posted by fieroguru: He has upgraded to something in the 3.6x range of final drives, bumped his rev limiter, and taken the engine up to 7K rpm... it was what started the whole discussion about the installed intake centerline being way too retarded (pun intended). He also was running the LS1 intake and either ported manifolds or DT headers. If all one did was install the cam with an otherwise stock LS4... probably would be a dog. The cam will give up lowend TQ to make upper RPM power, but the LS4 intake/exhaust will be a significant restriction to any upper RPM power increases... The key to the cam swap on the LS4 is to improve the intake and exhaust flow at the same time. I got a free LS1 intake and will do some exhaust mods (not sure what yet) and get rid of the DOD. For me I dont see a big enough boost in mpg to keep it. I would rather rev it to 7000g and swap to a 6 speed. I would guess that the DOD would not see better mpg stock v modified. dobey SEP 22, 04:14 PM quote Originally posted by Rickady88GT: I got a free LS1 intake and will do some exhaust mods (not sure what yet) and get rid of the DOD. For me I dont see a big enough boost in mpg to keep it. I would rather rev it to 7000g and swap to a 6 speed. I would guess that the DOD would not see better mpg stock v modified. Nice. Do you have all the info you need to drop the DOD? Does CARB not consider the DOD as "emissions equipment" for inspection? If you need some info about dropping the DOD, send me a PM or ask in my thread. I'm also deleting it on my LS4 (have everything, engine is just still disassembled). Rickady88GT SEP 22, 04:45 PM quote Originally posted by dobey: Nice. Do you have all the info you need to drop the DOD? Does CARB not consider the DOD as "emissions equipment" for inspection? If you need some info about dropping the DOD, send me a PM or ask in my thread. I'm also deleting it on my LS4 (have everything, engine is just still disassembled). Yes the DOD would need to be functional, but I think they would notice the 6 speed manual first? I was just going to drop the DOD by using an LS6 valley cover and cam/lifter set. I want a 6500+ rpm V8 6 speed. For no other reason than the sound and fun of shifting. I never wanted to build a race car, just a fun to drive car. dobey SEP 22, 05:17 PM quote Originally posted by Rickady88GT: Yes the DOD would need to be functional, but I think they would notice the 6 speed manual first? I was just going to drop the DOD by using an LS6 valley cover and cam/lifter set. I want a 6500+ rpm V8 6 speed. For no other reason than the sound and fun of shifting. I never wanted to build a race car, just a fun to drive car. You'll want to change the lifters also, and the oil pump and pan. I'm using an LS2 pump, and LS2 Vette pan/pickup/windage tray on my LS4. The LS2 Vette pan has better baffling, and the DOD's need for oil can result in starvation with the stock LS4 pump when you get rid of the DOD hardware. The Vette pan is also shorter, so you get a bit more ground clearance. You'll need an GenIV/LS2 valley cover actually. The LS1/LS6 cover is different. So don't waste your money on it. I got a new LS2 cover complete with new gaskets and bolts for $129, if I'm remembering correctly. Rickady88GT SEP 22, 08:04 PM quote Originally posted by dobey: You'll want to change the lifters also, and the oil pump and pan. I'm using an LS2 pump, and LS2 Vette pan/pickup/windage tray on my LS4. The LS2 Vette pan has better baffling, and the DOD's need for oil can result in starvation with the stock LS4 pump when you get rid of the DOD hardware. The Vette pan is also shorter, so you get a bit more ground clearance. You'll need an GenIV/LS2 valley cover actually. The LS1/LS6 cover is different. So don't waste your money on it. I got a new LS2 cover complete with new gaskets and bolts for $129, if I'm remembering correctly. Good to know, thanks. Syn SEP 26, 02:02 PM haven't heard anything in a while, hows it coming?