6.4 swap 2003 ram

[Jgress77]

I was wondering if anyone has done this with a pre vvt engine? Is there anyway to run a vvt 6.4 in a non vvt 5.7 hemi truck while using my oem accessories? I've heard the pre vvt 5.7 timing cover won't fit a 6.4 vvt at all. Then I've heard it will if I run the black bird timing kit? Im wanting to build the engine with a twin turbo setup it will be running on a holley ecu so thats not a problem. I would like to run all my oem stuff so it still works with the oem ecu and fuse panel but the holley will control the engine.

 

[Fast69Mopar]

I was wondering if anyone has done this with a pre vvt engine? Is there anyway to run a vvt 6.4 in a non vvt 5.7 hemi truck while using my oem accessories? I've heard the pre vvt 5.7 timing cover won't fit a 6.4 vvt at all. Then I've heard it will if I run the black bird timing kit? Im wanting to build the engine with a twin turbo setup it will be running on a holley ecu so thats not a problem. I would like to run all my oem stuff so it still works with the oem ecu and fuse panel but the holley will control the engine.

Yes, there is a way to control the VVT on a 6.4 HEMI. The Holley Dominator ECU and the Terminator X Max can control the VVT with a Holley Sub-Harness Part #558-131 for VVT and if you want to use the SRV (Short Runner Valve) in the intake manifold you will need
Part #558-132 to control the VVT and SRV.

 

[Jgress77]

Yes, there is a way to control the VVT on a 6.4 HEMI. The Holley Dominator ECU and the Terminator X Max can control the VVT with a Holley Sub-Harness Part #558-131 for VVT and if you want to use the SRV (Short Runner Valve) in the intake manifold you will need
Part #558-132 to control the VVT and SRV.

Is it worth running all that or should I just delete them? I plan to go twin turbos and forged rods and pistons

 

[Fast69Mopar]

Is it worth running all that or should I just delete them? I plan to go twin turbos and forged rods and pistons

I would ditch the plastic intake manifold along with the short runner valve for an aluminum aftermarket piece like the one from Brian Tooley Racing or even the Blueprint Engines manifold or the Jegs Fabricated Aluminum intake. These manifold will be much more suited to handle higher boost pressures over the stock manifold.

The 6.4 Apache cylinder heads are quite impressive out of the box in terms of flow numbers. If you are sticking in a set of forged pistons and rods and putting on a pair of turbo's I would take the time to perform some minor/major port work on the cylinder heads. As good as they are in stock form there is always room for improvement in the flow department.

There is power to be unlocked in the Apache cylinder head. This doesn't require thousands of dollars and a CNC Machine either. If you have a good understanding of how the air moves through the cylinder heads you can make some improvements that are easy on the pocketbook and good for your 60' times.

 

[Jgress77]

I would ditch the plastic intake manifold along with the short runner valve for an aluminum aftermarket piece like the one from Brian Tooley Racing or even the Blueprint Engines manifold or the Jegs Fabricated Aluminum intake. These manifold will be much more suited to handle higher boost pressures over the stock manifold.

The 6.4 Apache cylinder heads are quite impressive out of the box in terms of flow numbers. If you are sticking in a set of forged pistons and rods and putting on a pair of turbo's I would take the time to perform some minor/major port work on the cylinder heads. As good as they are in stock form there is always room for improvement in the flow department.

There is power to be unlocked in the Apache cylinder head. This doesn't require thousands of dollars and a CNC Machine either. If you have a good understanding of how the air moves through the cylinder heads you can make some improvements that are easy on the pocketbook and good for your 60' times.

Okay thanks what about the vvt is it worth keeping?

 

[Fast69Mopar]

Okay thanks what about the vvt is it worth keeping?

In my professional opinion I think the VVT is a great piece of equipment for the 6.4 HEMI especially if you are sticking with the stock camshaft or installing a very mild aftermarket bumpstick.

If you are serious about making big power then an aftermarket camshaft with big lift and big duration is more tailored to this type of application and locking out the VVT and disabling it in the tune would be the ticket.

Do you have a realistic power goal?

Is this motor being built to make reliable horsepower for a truck that is a daily driver or a track only truck?

 

[Jgress77]

In my professional opinion I think the VVT is a great piece of equipment for the 6.4 HEMI especially if you are sticking with the stock camshaft or installing a very mild aftermarket bumpstick.

If you are serious about making big power then an aftermarket camshaft with big lift and big duration is more tailored to this type of application and locking out the VVT and disabling it in the tune would be the ticket.

Do you have a realistic power goal?

Is this motor being built to make reliable horsepower for a truck that is a daily driver or a track only truck?

800hp possibly for a while then maybe boost to 1k maybe. I plan to keep either stock cam or just small cam for sound

 

[Fast69Mopar]

800hp possibly for a while then maybe boost to 1k maybe. I plan to keep either stock cam or just small cam for sound

I think 800HP from a 6.4 HEMI with a stock cam and stock heads is going to take about 20lbs. of boost to make that number. With an aftermarket camshaft you can probably bring the boost down to 15psi as long as you have the fuel system and intercooler setup to make this kind of power.

Personally, when I select a set of pistons for a 6.4 HEMI that's getting a pair of turbo's I bring the compression down a bit to 10.0:1. Then, a big set of injectors from in the 1000cc range for pump gas or 1350cc injectors for E85 or Q16. Don't scrimp on the intercooler. Get a quality cooler and cram as much cooler you can into the space you want it to go. I really like the ice water boxes with a water pump to circulate the chilled water.

 

[HemiLonestar]

If you go this route (even with a stock 6.4) you need to address the trans first.

 

[Jgress77]

Plan to go built 8hp70 or maybe 90 if I can get a t case to work correctly

 

[Jgress77]

I think 800HP from a 6.4 HEMI with a stock cam and stock heads is going to take about 20lbs. of boost to make that number. With an aftermarket camshaft you can probably bring the boost down to 15psi as long as you have the fuel system and intercooler setup to make this kind of power.

Personally, when I select a set of pistons for a 6.4 HEMI that's getting a pair of turbo's I bring the compression down a bit to 10.0:1. Then, a big set of injectors from in the 1000cc range for pump gas or 1350cc injectors for E85 or Q16. Don't scrimp on the intercooler. Get a quality cooler and cram as much cooler you can into the space you want it to go. I really like the ice water boxes with a water pump to circulate the chilled water.

Okay thanks how much hp can 1000cc injector push on 91? What pistons do you recommend? I've done some research and came across the ones from Brian tooley but theyre either 10.9:1 or 9.5:1

 

[Fast69Mopar]

Okay thanks how much hp can 1000cc injector push on 91? What pistons do you recommend? I've done some research and came across the ones from Brian tooley but they're either 10.9:1 or 9.5:1

1000cc injectors can support 800HP-1000HP on pump gas but you may find the duty cycle getting a little high under higher boost numbers. I would go for a 1200cc injector to give yourself some overhead for tuning purposes. 1200cc injectors aren't the easiest to tune for street driving but if you have a true Mopar tuner they won't be a problem. Make sure you have a fuel pump(s) that can support 800hp on the street. You will also need a quality wideband O2 for tuning. I like to use the two channel widebands so I can tune each bank individually. I recently installed a FAST Dual channel wideband in my truck and I was impressed with the quality of the kit and I really like the display. If you are using HP Tuners make sure that your wideband can be logged as a PID/channel in HP to make things easier for your tuner.

For twin turbo setups on the 6.4 HEMI I like the Manley Extreme Duty forged pistons as well as Wiseco and Ross. They all make a good, quality forged piston in my unprofessional opinion.