Whats the typical thickness of a nitrous plate?

 

Just had a look, those are pretty pricey. Some of the designs would cause a restriction.

My thinking is to extend the TB out to allow the flow to become more laminar as it enters the intake. The TBS would do that however it would also cause a restriction and would need to be cut down to match the output of the 70MM TB.

 

What size is the opening into the intake manifold? You don't want a 'step' there, as that would make for some turbulent airflow...... which seems to be what you are trying to avoid.

 

Not sure, just getting the wheels turning on ideas on this... not sure if I will ever do anything on it with the project list as full as it is. It would be off quite a bit in the future if I dove into it. To many lower hanging fruits to leverage 1st.

 

Forget screwing around with a spacer. Find an early 00's 4.7HO manifold (harder to find) or the 08+ intake manifold (easier to find but requires a TB adapter since the 08+ was FBW) and bolt that on. Automatically superior to your stock manifold.

 

I dont learn anything by not experimenting... you dont know what you dont know until you figure it out. Remember, would not be using it as shipped, would be extending the throttle body out an inch and adding volume to the IM.

The 08+ manifold and most likely the HO manifold may not work for my objectives. The shorter runners moves the power up the RPM range, I want it lower. I am after peak torque down around 1800~2000 rpms.

 

But we already know that tb spacers don't do squat. You can play with it, but, pretty sure it's just a waste of time.

 

1. You aren't going to achieve that goal with an extra long TB neck (which is what you're doing).
2. You aren't going to achieve that goal with that particular engine without more extensive changes because it isn't designed that way. You want peak torque that much lower on a 4.7? You need custom cams and the needed PCM recalibration to go with them. That whole engine family (the 3.7 and all variations of the 4.7) has always been that way.
3. You want peak torque that low with the same approximate power? Swap in a 4.0L Jeep I6.

 

So your saying a TBS does not change anything in the way a motor performs? There are the same commenters on the intake horn on the cummins motor. The IH does nothing for performance... my 1st hand experience tells me otherwise relating to the stock IH & the ATS Arcflo.

What will an extra long TB neck to do performance? I have not found anything on the web that shows me what would happen to lengthening the area behind the TB. I did find info that tells me what happens in front of the TB though, but not behind.

The HO manifold vs the '99-'03 (?) manifold... what did they do to make it an "HO" manifold, shorten the runner length which moved the power up the rpm range...


https://dodgeforum.com/forum/3rd-gen...ml#post2812024

That post indicates that they shortened the runners as the years went on, then a lot of folks jumped on the band wagon and swapped over to the shorter runner manifolds. Most of those from what I have read are looking for top end power.

This mod... https://www.cumminsforum.com/threads...od-v3.2550392/ one of my favorites... I didnt wake up one day and decide to do this, first was the CAI and the loss of approx 1 mpg that came with it. Then came the return to the stock air box and the return of the 1 mpg lost. Then came the V1 version with an $8 vent on the bottom of the air box. Open gave the benefit of the CAI (with the drop in mpg because of the tq peak moving higher up in the rpms... enough to see the mpg drop)... Closed gave me the current mpg's. Then came V2 at a cost of close to $300, where I put an electric exhaust cutout on it... I get the best of both worlds at the flip of a switch. Finally came V3 at a cost of about $100 because I used parts from V2, automatic control over the boost controlled cut out. The best of both worlds on the fly, every throttle event every day. It did increase mpg's but it was also combined with another mod (i forget which one) so it was hard to say which did what. V3 of the air box mod... one of my favorites.

The point is, just because a lot of people say one thing, does not mean it will apply in all cases. You can continue to stay inside the box and go with the herd but I prefer to stay outside the box and learn what I can.

Thanks to both of you for motivating me... I will go spend the $ and learn what I can from it, I will see 1st hand how it can be used.

 

LMAO....yes that's all very nice. What you are failing to realize is that there is a reason (probably several) both the factory and aftermarket basically ignored this engine beyond anything stock. You have fun, bubba. I'm sure you'll show us 🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣��🤣