Jakee's 4.0 SOHC Build up discussion and motivation thread

[Jakee]

Work In Progress Y-pipe Pics

I wastn't gonna post these but what the hey. It's ugly right now but you can see some of the changes being made to this y-pipe.

 

[CDW6212R]

That's very nice, good collector, joints, and the ball connection. Where did the 2-into-1 collector come from? I wonder if versions are available for 2.5" and 3.0" pipes, I'm thinking of pieces to make crossovers for my V8. Regards,

 

[Jakee]

Thansk. That collector is hand made by my dad. He's pretty skilled with this sort of thing and could do a lot better with the right tools. I think he's doing pretty good for what he has but it's time consuming as heck.

The actual y-pipe primaries are 2-1/4". the bigger pipe is a 3".

You can get a 4" pc of pipe and work this into shape but like I said, time consuming.

 

[CDW6212R]

That looked promising for me, I am planning on 2.5" cat pipes to start with, and may end up going to 3" if it would really help any later. The real problem with crossovers is their very poor transitions of exhaust flow. "H" pipes are horrible and "X" pipes purposely slam exhaust flow together, crossing each other's path. Good collectors merge the exhaust, and do not force the flow together drastically. That's what I noticed imnmediately about that picture above. Night,

 

[Jakee]

CDW6212R - I'm not sure I understand completely. What exactly are you wanting? Are you talking 2.5" primaries into a 2.5" single?

What you can do is buy a flowmaster reducer. Say a 3.5" to 3.0" and then oval the 3.5 side. Beat the rest of it in shape.

I have materials ready to build these things if anyone wants.

The reason why I'm asking is because I've tried just about every combination you can think of. I pretty much know what does what and may be able to help more. The 3" single is not to big for our engines, exspecially when you're going into a 3" cat. My goal for this is hit right in the middle, and aimed more for torque.

 

[jah81592]

Got the headers on today but haven't finished the exhaust.

The headers were actually pretty easy to install and everything lined up pretty good. Just had to bend the EGR tube a bit and had one heck of a time with a couple of bolts on the passengers side. Other than that, not to bad.

I'm ready to hear what this thing is gonna sound like...and what it's gonna do.

The sound will be a bit deeper and smoother on the topside. Less rasp!

 

[Jakee]

The sound will be a bit deeper and smoother on the topside. Less rasp!

that's just what I'm looking for!

 

[Xan]

Xan, is there anyway I can get you into a ExCal2 and away from the Hypertech?

Actualy i was gonna PM you about that. Hit me up with the cost and what the benefits of it would be and you probaily will be making a sell

 

[Xan]

I wastn't gonna post these but what the hey. It's ugly right now but you can see some of the changes being made to this y-pipe.

View attachment 40809

Wow thats some nice work, 3 inch pipe for your whole exhaust will work really good. Props to your dad man that y into 3inch looks really professional

 

[CDW6212R]

CDW6212R - I'm not sure I understand completely. What exactly are you wanting? Are you talking 2.5" primaries into a 2.5" single?

What you can do is buy a flowmaster reducer. Say a 3.5" to 3.0" and then oval the 3.5 side. Beat the rest of it in shape.

I have materials ready to build these things if anyone wants.

The reason why I'm asking is because I've tried just about every combination you can think of. I pretty much know what does what and may be able to help more. The 3" single is not to big for our engines, exspecially when you're going into a 3" cat. My goal for this is hit right in the middle, and aimed more for torque.

I'm thinking of changing from 2.5" pipes to twin 2.25" pipes, a collector to merge 2.25" pipes into one 2.5" pipe. I haven't done the math yet, the 2.25" size may be better for use with a 3" pipe, which is what you have done.

 

[Jakee]

The 2.25" pipe will fit in 3.5 but it will have to be stretch a bit.

2.25 * pie (3.14) = 7.065 + (2.25 + 2.25) = 11.565

3" = 9.42 Won't work
3.5 = 10.99 Have to stretch
4" = 12.56 Perfect.


Just cut a triangle out of it and squeeze one end done. Do a seam weld and presto.

That's why I suggested 4" pipe. However, we used a 3-1/2" to 3" header reducer. Go to the flowmaster website and you'll see what we started with.




By the way, I'm not going 3" all the way. I'm going 3" to right before the Muffler (Stock location) and then reducing to a 2.5" pipe, muffler, and out the truck. I think 3" all the way out might be to much. I'm gradually reducing as the distance from the engine grows.

 

[CDW6212R]

If you are running the 3" pipe to near the muffler, I'd run it straight into a 3" muffler. The reduction to 2.5" would be more restrictive than if you do it in the muffler, or after it.

BTW, the area of a circle is pie times the square of the radius. Comparing two pipes ignore pie, compare just the two radius' square numbers. The 2.25" pipe results in a 1.265 figure, doubled is 2.53. Take the square root of that gets the figure 1.59, which is the radius of the single pipe needed to equate to two 2.25" pipes. That OD of 3.18 is closest to a 3" pipe size. I couldn't remember the actual results from years ago, but 2" pipes I think are still almost the same as a 3" pipe. I may see how 2" pipes work for my crossover then.

 

[Jakee]

You are correct. I was getting the circumference of the 2.25 pipe (OD), and you'd actually dived by 2, then add the distance from the center line twice and, add the other half circumference which tells you what the ID of the pipe needs to be in order to fit into.

OO <-- two pcs of 2-1/4" pipe against each other. Get the circumference of one and dived by 2. get the circumference of the other and divide by 2. (equals one circumference) then the distance between center line twice, and you arrive at the estimated length you need. Then convert that to a circumference...okay, okay, this is the redneck way of doing it but it works.

Or, just wrap a tape measure around the darn pcs and call it a day!

 

[Jakee]

Yeah, I realize it would probably be better to do the reduction in the muffler, but I've already got the muffler. It probably won't make much of a diff.

 

[CDW6212R]

Gotcha, I thought that you might, it's no biggy. I've redone the exhaust in my head enough that I've saved a lot of money. I have a friend or two here that change exhausts regularly.
I just wasted good money on a pair of Brembo calipers that turned out to be too small, now I have to try to return them. Night,

 

[Jakee]

Gotcha, I thought that you might, it's no biggy. I've redone the exhaust in my head enough that I've saved a lot of money. I have a friend or two here that change exhausts regularly.
I just wasted good money on a pair of Brembo calipers that turned out to be too small, now I have to try to return them. Night,

If it makes you feel any better, I've wasted a BUNCH of money trying to figure things out for myself. It's all learning for me, and if I can help someone out, I don't mind doing it.

 

[Jakee]

Got to drive the truck, finally! Here's what I think so far:

The performance side of things is great. There is a distict improvement over what I had. It feels strong thuout the entire RPM range, and exspecially the MID to High RPM range. The truck pulls good and really good in the high RPM'S. There is no loss in lowend at all. Actually, it feels stronger there as well. I love the performance and If your looking for EVERY thing you can get from your 4.0 SOHC then headers are worth it. However, if you plan to buy a set of JBA headers, I would buy the Steel chrome plated version. If you didn't know, I went with the stainless titanium coated headers. There great but I'm not sure the extra dollars you pay for them are really worth it.

Now, the bad part. I'm not really fond of the sound I'm hearing when at WOT. It almost sounds like a supped up motor boat? Hmmmm, I may get use to it, or a my change the muffler again? Anyways, all and all, i'm pleased with the results. Now, I'm curious to see the numbers from a dyno.

 

[aldive]

When are you going to the dyno?

Good luck ....

 

[Jakee]

I cannot say a date. Everytime I do that, something comes up and I can't come thru. The only thing I can say is I will get some dyno numbers before I go turbo.

I will be doing a "remote" tune with James after I get a wideband. There will be a thread about it.

 

[Xan]

another thread other then this one? Thats insanity