60 replies to this topic

[speedster]

Best exhaust manifold for an itb'd NA? I currently have a regal manifold. 

[Mike (Cliffie)]

Vocky's.

[slindborg]

Best for what, mid range, peak, packaging, etc

[oakmere]

TMS or Tullet are the only options available really. Make your own is the best option though, or a custom builder.

Edited by oakmere, 16 September 2013 - 09:51 PM.

[Sticky]

Vocky's.

^ that coupled to the rest of his exhaust system

[Exmantaa]

At least a decent 4-2-1 manifold, or a long primary 4-1. And probably not too big a bore, as you need the exh gas speed for scavenging effect... 

(Only nothing readily available what comes close to this... )

 

 

 

[speedster]

Best for what, mid range, peak, packaging, etc

Are you wearing slippers?

[oakmere]

My Tusudo has worked well for the price but it dose require mods to the 2-1 section and the bodywork.

[speedster]

TMS or Tullet are the only options available really. Make your own is the best option though, or a custom builder.

 

This is what I'm thinking. What type of weld should I skill up on?

[speedster]

Vocky's.

 

Is vocky's a 4-1 or a 4-2-1?

[FLD]

 

TMS or Tullet are the only options available really. Make your own is the best option though, or a custom builder.

 

This is what I'm thinking. What type of weld should I skill up on?

 

 

TIG.  Easy enough.  The only tip I'd give is not to put too mcuh heat in.  Most stainless systems are welded not quite through the full thickness.  If you weld through fully you get furring unless you back gas.  I learned this the hard way

[oakmere]

Vocky's.

  Is vocky's a 4-1 or a 4-2-1?

Vockys is a 4-2-1 and it is looped after the manifold to increase the system length by over 1M. This is to improve midrange I think.

[oakmere]

A good place to start with manifold dimensions is as follows: 490mm long primaries - 44mm, 490mm long secondaries - 55mm, collector 64mm.

[davemate]

 

 

TMS or Tullet are the only options available really. Make your own is the best option though, or a custom builder.

 

This is what I'm thinking. What type of weld should I skill up on?

 

 

TIG.  Easy enough.  The only tip I'd give is not to put too mcuh heat in.  Most stainless systems are welded not quite through the full thickness.  If you weld through fully you get furring unless you back gas.  I learned this the hard way

 

 

The chap that makes mine back gased the lot. Mine is loud, but it is a true 2.5" system and the primaries are as large as possible, but it is a manifold and downpipe section all in one to save joints and compromising on the design.

[speedster]

 

 

 

TMS or Tullet are the only options available really. Make your own is the best option though, or a custom builder.

 

This is what I'm thinking. What type of weld should I skill up on?

 

 

TIG.  Easy enough.  The only tip I'd give is not to put too mcuh heat in.  Most stainless systems are welded not quite through the full thickness.  If you weld through fully you get furring unless you back gas.  I learned this the hard way

 

 

The chap that makes mine back gased the lot. Mine is loud, but it is a true 2.5" system and the primaries are as large as possible, but it is a manifold and downpipe section all in one to save joints and compromising on the design.

 

mandrel bends?

[davemate]

 

 

 

 

TMS or Tullet are the only options available really. Make your own is the best option though, or a custom builder.

 

This is what I'm thinking. What type of weld should I skill up on?

 

 

TIG.  Easy enough.  The only tip I'd give is not to put too mcuh heat in.  Most stainless systems are welded not quite through the full thickness.  If you weld through fully you get furring unless you back gas.  I learned this the hard way

 

 

The chap that makes mine back gased the lot. Mine is loud, but it is a true 2.5" system and the primaries are as large as possible, but it is a manifold and downpipe section all in one to save joints and compromising on the design.

 

mandrel bends?

 

 

Yep, some of them are quite complex due to the space. I have a twin silencer single exit pipe exhaust now.

[speedster]

 

 

 

 

 

TMS or Tullet are the only options available really. Make your own is the best option though, or a custom builder.

 

This is what I'm thinking. What type of weld should I skill up on?

 

 

TIG.  Easy enough.  The only tip I'd give is not to put too mcuh heat in.  Most stainless systems are welded not quite through the full thickness.  If you weld through fully you get furring unless you back gas.  I learned this the hard way

 

 

The chap that makes mine back gased the lot. Mine is loud, but it is a true 2.5" system and the primaries are as large as possible, but it is a manifold and downpipe section all in one to save joints and compromising on the design.

 

mandrel bends?

 

 

Yep, some of them are quite complex due to the space. I have a twin silencer single exit pipe exhaust now.

 

 

Was it manufactured from drawings or by expertise and skill? or both

Got a photo?

[BAre]

If you are aiming for Hp you need to pulse tune Your hedder. Use the opening time BTDC for the exhaust cam. Determend primary length and use that number to make out the ID for tubing.

 

Here is my numbers 233 rwhp! 4-1 hedder,  3" Down to the catalyst, and 2,5" the rest. Primary is 2" tubing.

 

42 mm AT Power TBI.

 

[BAre]

Forgot the hedder pic....

 

[speedster]

Forgot the hedder pic....

 

 

Nice! Where did you get the manifold, bends and the collector?

 

Pulse tuning..... NA tuning is so much more fun than boosting