TXsilverado

iTrader: (19)

For down low torque the only mods that will make a sizable difference is gears, cubes, blower or nitrous. I don't suggest the nitrous route for towing.

zz454Chevelle67

2500 HD trucks with 4L80 used to come with 4:10 gears for a reason, you need more gear or a roots supercharger, both would make it a towing ****.

RDF1

I know what your wanting. Not sure if you understand the suggestions provided.

Gm claims 325hp @ 5200 rpms and 365tq at 4000 rpms.
Does it downshift everything your trying to go uphill?

Your mostly cruising at ~2000 rpms at 70mph. Going to a lower gear gets you more rpms which gets your higher in the torque curve instead of being at the very bottom of it.
The reason a supercharger was suggested is that it will make boost at your cruising rpms and increase torque quite a bit with only 6psi. It will let it stay in 4th gear with torque converter locked while towing. Sure it's not cheap by any means, but you could be just towing in 3rd gear instead of 4th to help.


Saying all that, I use to tow a lot with a stock LQ4 and a turbo. It made a huge difference with only 5-6psi at 1800 rpms. Turning it up to 10psi got me in trouble by towing substantially more than truck was rated for and I had helper bags so I'd just air them up to level the truck and go. Ended up bending the frame but it would chug on along like a diesel and make whistle noises.

thebrain

1st off I haven't towed w/ the RV yet however it feels much weaker than the 03 1500 express w/ it's 5.3. and RV has half the milage at 116K.
I'm not opposed to a blower I like low end torque.w/ surporting mods minus exhaust (to little ground clearance and to much plumbing underneth for decent exhaust) how much torqure can I expecpt a blower would be a easy bolt on for me however I'm not sure it would even fit under the dog house (inside hood). it was also mentioned that the frame could be in the way of LTs, would a stock exhaust seriously limit the
blowers power?
I'm thinking w/ 6psi injectors size wound need to be increased and also fuel pump.
please provide some #s and parts + prices used blower and new fuel stuff. + none dyno tune w/ HP tuners
type of blower like could I use a LSA reject (warrenty) blower thats been rebuilt I kindof found out about these blowers right when everyone else did just when the prices went up).( I believe there's a different type of ports on the heads on the LQ4 but there are adapters to compensate a LSA) size of injectors & FP.more importantly torque #s.

I believe I have 3-73 gears w/ a10.5 14 bolt full floating axle GT4 Axle Rear (Dup of 5X1) 3.73 I think is LSD not sure what Dup of 5X1 is, images of options code and similar axle minus the drum brakes.thanks

strutaeng

Yes, 3.73. If you have 14 bolts on the diff. cover, then that's the 14 bolt. I believe the Dana 70 variant had 10 or 12 bolts. I don't see the G80 for the rear axle, so it looks like you have an open differential.

The reason why the 3500 feels slower than the 1500 is because the 3500 is simply a much heavier, more robust vehicle: heavier frame, heavier brakes and much heavier axle, heavier transmission too. Then you have the extra weight of the mini-RV. And the 3.73 are not really ideal for that. A 2500/3500 is never going to be faster than anything 1500 in stock form (unless it's a V6); they were built for towing hauling, not much for speed.

Yeah, I've never seen a turbo stuffed into an Express van. We have a '20 3500 passenger van and everything in there seems pretty tight. I'm sure it can be done with time and money. There's plenty of room back underneath the rest of the body, and they sit really high. Maybe a remote turbo setup? Have you looked into an LSA? Seems like those are much low-profie on the engine side?

arthursc2

iTrader: (5)

https://www.performancetrucks.net/fo...-8-van-539084/

silentbravo

iTrader: (1)

If you go with LSA, I think they are taller than a Magnuson TVS 1900, and if you use the intake adapters with an LSA that's even more height that you might not have. I don't think the Magnuson are really all that much taller than a stock truck intake though, and if you are looking for the simplest bolt on, then it's probably the way to go. The LSA involves a bit more accessory finagling which you may not have room for either.

thebrain

will the 6.6L L8T engine swap be a direct swap?I'm thinking the heads intake ports are a differnt shape and I couldn't reuse my intake and fuel injectors?

I believe this engine has the DOD an AFM.

please recommend a cam swap for the L8T to get rid of the DOD stuff an add low end torque. or where to get kit w/ all needed parts.

thanks

RDF1

It would fit but it would need some trickery to get it to work (L8T is 58x crank reluctor - 4x Cam Reluctor. Yours is a 24x crank - 1x cam). Plus the L8T is a Direct Injected engine not Port injection like yours.

strutaeng

I've seen some of those L8T cranks swapped into Gen III (or IV?) and it looks pretty sweet. I don't remember what they did for heads or intake? 🤔

I think another video shows how to convert from L8T direct injection to port injection?

I think they are 58X, so you would need a 58X ECU?

Apparently those OEM cranks are forged and "affordable" compared to an aftermarket forged crankshaft?