650 hp vs down pipe

[Ernie GN]

On a engine pumping 650hp at crank.
3 inch down pipe ok?

Or 3.5 ?

 

[Mr.Spool]

On a engine pumping 650hp at crank.
3 inch down pipe ok?

Or 3.5 ?

3 inch 650 easily

 

[Ernie GN]

Thank you
The rest of the duel exhaust using a 2.5 with Magna flow mufflers ( they are basically straight pipe with packing )
2.5 should be good then ?

 

[Mr.Spool]

Thank you
The rest of the duel exhaust using a 2.5 with Magna flow mufflers ( they are basically straight pipe with packing )
2.5 should be good then ?

In my testing I have only ran 3 inch,3.5 and bigger stuff.you could always have a dump tube on your setup and test on your car and see. I don't like to guess giving guys advice but if you were to twist my arm I would think duel 2.5 should be fine with 650hp.

 

[Ernie GN]

In my testing I have only ran 3 inch,3.5 and bigger stuff.you could always have a dump tube on your setup and test on your car and see. I don't like to guess giving guys advice but if you were to twist my arm I would think duel 2.5 should be fine with 650hp.

I was guessing the same.

I’m a plumber, I know that two 2.5 inch pipes will out flow one 3 inch at any distance.
But that has nothing to do with cars.

I’ll leave that part alone since I already did it.

 

[marleyskater420]

I was guessing the same.

I’m a plumber, I know that two 2.5 inch pipes will out flow one 3 inch at any distance.
But that has nothing to do with cars.

I’ll leave that part alone since I already did it.

Hey Ernie, Mr.Spool had a solid suggestion about running a dump pipe on your car.

Here is a link to a 3" electronic dump pipe that comes with the motor, y-pipe, and the switch to turn it on and off. For $100 it is pretty hard to beat!
http://www.siliconeintakes.com/dsm-intercooler-piping/3.0"-electric-exhaust-cutout-_-bypass-valve-p-9577.html?osCsid=6256cf5049e2c0252b403588a5cf2c20

 

[Ernie GN]

Yes it a good idea.
I can add it in. I only have the 2.5 duel set up finished. I need to down pipe still,still gives me time to add in.

I have different question.

The guy building my engine says he needs pistons before he bores out my block.

I had talked to Brian (bison performance) a while back and he told me he first bores then gets pistons.
( this makes sense to me)

Can this go both ways?

 

[dank GN]

Yes it a good idea.
I can add it in. I only have the 2.5 duel set up finished. I need to down pipe still,still gives me time to add in.

I have different question.

The guy building my engine says he needs pistons before he bores out my block.

I had talked to Brian (bison performance) a while back and he told me he first bores then gets pistons.
( this makes sense to me)

Can this go both ways?

You can go about that both ways I personally like to order the pistons and then do the final finish hone when the piston arrives

 

[Nick Micale]

............The guy building my engine says he needs pistons before he bores out my block.

I had talked to Brian (bison performance) a while back and he told me he first bores then gets pistons.
( this makes sense to me)

Can this go both ways?

We have built hundreds of turbo V-6 engines and ALWAYS do the machine work including the cylinder bores before ordering pistons.

Boring the cylinders may show small rust holes, or even other defects in the block like a crack in the bore or the main web?

This is not an opinion, but what we have encountered over many years.

 

[Ernie GN]

We have built hundreds of turbo V-6 engines and ALWAYS do the machine work including the cylinder bores before ordering pistons.

Boring the cylinders may show small rust holes, or even other defects in the block like a crack in the bore or the main web?

This is not an opinion, but what we have encountered over many years.

I’m with you on this.
I had a sbc that had a line down the hole. I had it done at 20 over. Well 20 over was not enough, it still showed.

 

[Ernie GN]

I don’t know if I should make him do it the way I like it .
I’m too nice sometimes
I don’t want to offend him or piss him off.

I would imagine that the deck must be done.
How else is he going to know the deck height.

I need to talk to him about my concerns.
I would hate to order the Pistons and then have him call me saying It needs to be bored a little bigger .

 

[Ernie GN]

You can go about that both ways I personally like to order the pistons and then do the final finish hone when the piston arrives

This I would still be comfortable with because at least you have the rough bore done and just needs the final hone.

I got to talk to him.

 

[Chuck Leeper]

How else is he going to know the deck height.

He shouldn't have to set up, to measure the deck....

 

[Ernie GN]

He shouldn't have to set up, to measure the deck....

Makes me feel better.
I haven't talked to him but at least I'm more informed

 

[dynoman]

On a engine pumping 650hp at crank.
3 inch down pipe ok?

Or 3.5 ?

I have a 3" down pipe & 2 1/2" ATR duel exhaust with NO cut out and my motor makes 767 hp / 787 ft lb torque ! I don't believe you will be limited with that exhaust combo .

 

[Ernie GN]

I have a 3" down pipe & 2 1/2" ATR duel exhaust with NO cut out and my motor makes 767 hp / 787 ft lb torque ! I don't believe you will be limited with that exhaust combo .

What connection does the downpipe have?
I need a stock style 4 bolt

 

[dynoman]

My down pipe is an ATR , Terry Houston style with internal waste gate .

 

[Ernie GN]

My down pipe is an ATR , Terry Houston style with internal waste gate .

I’m new to this I’m sorry
Is that like a stock bolt pattern ?
Well I’d be interested in the down pipe.
The rest of my exhaust is finished

 

[Ernie GN]

My down pipe is an ATR , Terry Houston style with internal waste gate .

Send me a picture too please

 

[dynoman]

Yes , like stock .
ATR is out of business years ago , but many of the vendors on here could help you with your decision on what DP would best mate up with your exhaust system .
Everybody was new to this at one time , so keep asking questions and reading posts . Sam