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Question Exhaust headers for 3.2 SS - Diameter?

What exhaust header diameter would you recommend for a 3.2 SS engine with ITBs and EFI?

I currently use the car with a ratio of about 70% track and 30% road and the weather is warm enough that I don't need heating.

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Old 11-24-2020, 07:47 AM
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Exhaust headers for 3.2 SS - Diameter?

39mm ID
3.2 SS, ITB, EFI, near RSR camspec.

This is torque at the wheelhubs:





Last edited by Classic 911; 11-24-2020 at 08:04 AM..
Old 11-24-2020, 07:58 AM
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Probably an 1 5/8” O.D.
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Old 11-24-2020, 09:28 AM
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Quote:
Originally Posted by winders View Post
Probably an 1 5/8 O.D.

Thats correct.


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Old 11-24-2020, 11:48 AM
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For a track car 3.2L SS with ITB's I'd recommend 1.63/1.75 step headers, F1 collectors w/ tuned equal length primaries. Muffler choice is also important.
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Old 11-24-2020, 02:03 PM
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Quote:
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For a track car 3.2L SS with ITB's I'd recommend 1.63/1.75 step headers, F1 collectors w/ tuned equal length primaries. Muffler choice is also important.
If the OP wanted to go that route, I would recommend contacting Mark Robles at SCarGo to make custom headers for him.
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Old 11-24-2020, 02:24 PM
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1-5/8" would be my suggestion as well.
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Old 11-24-2020, 04:08 PM
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What would wall thickness typically be for these 1-5/8 headers be?

I have 42mm OD/39mm heat exchangers on mine. No back to back comparison, or even dyno results, but the motor is a delight......

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Old 11-24-2020, 06:05 PM
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Typical wall thickness used for headers made with 304 stainless is 0.065". If you want a lighter stronger (more expensive) alloy such as 321 stainless the wall thickness can be reduced to 0.049".
We've built a lot of headers for 3.2L street cars and track cars, gathering a lot of data along the way. In a few weeks there will be a comprehensive comparison released by a 3rd party showing exactly the difference between our tuned for Carrera 1.63" long tube headers vs SSI on the 3.2L Carrera engine in a street car. The only change made will be the headers. I was contacted by him after the fact to get my permission to publish the data. I don't know what it shows (but have a really good idea, ha!) so patiently waiting with my box of popcorn.
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Old 11-25-2020, 07:22 AM
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while waiting, can you tell us if the data is engine dyno or just a toad dyno?
Old 11-25-2020, 10:55 AM
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I would expect any 1 5/8" headers to easily produce more power than SSIs...
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Old 11-25-2020, 11:31 AM
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Toad dyno? I'm told testing will be done using the same dyno. I have no idea what type it is as my involvement is only to supply the headers.
Yes just about any 1.63" headers should out perform SSI on a 3.2L engine, unfortunately not everyone knows that. The fellow doing the test apparently did not as he purchased SSI for his Carrera before being told by his tuner about our approach to optimizing header design based on application. SSI sells the same basic exchangers labeled for anything from 2.2L to 3.6L, which obviously isn't going to perform the same for all on that broad a range. The test really isn't about if the 1.63" headers will be better, but by how much and at what RPM. Lots of data on peak HP and peak torque, it's good to see the entire range.
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Old 11-25-2020, 01:35 PM
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For reference of typical wall thickness for header material..

Exhaust Tubing Stainless Steel - www.spdexhaust.com
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Old 11-25-2020, 01:41 PM
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Awesome discussion. Thanks everyone!

Quote:
Originally Posted by RarlyL8 View Post
SSI sells the same basic exchangers labeled for anything from 2.2L to 3.6L, which obviously isn't going to perform the same for all on that broad a range.
Do you know what the header diameter of SSI's is?
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Old 11-25-2020, 03:39 PM
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awesome discussion. Thanks everyone!



Do you know what the header diameter of ssi's is?


1.5" od 1.375 id
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Old 11-25-2020, 04:08 PM
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1 1/2" O.D. with 35mm I.D.
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Old 11-25-2020, 04:09 PM
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Lol Scott a minute apart.. Just to note 1.375 vs 35 mm is written 1.378 for those wondering. Also important to note when John was building ssi's they were not using metric tubing.. They maybe now though
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Old 11-25-2020, 04:19 PM
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Quote:
Originally Posted by RarlyL8 View Post
Toad dyno? I'm told testing will be done using the same dyno. I have no idea what type it is as my involvement is only to supply the headers.
...

I call Road dynos Toad dynos due to the variance in results.
Old 11-25-2020, 04:28 PM
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I just quoted what I saw on the Cargraphic web site. Technically, tubing does not have a specific I.D. measurement. They have an O.D. and a wall thickness.....
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Old 11-25-2020, 04:39 PM
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Quote:
Originally Posted by winders View Post
1 1/2" O.D. with 35mm I.D.
Quote:
Originally Posted by winders View Post
I just quoted what I saw on the Cargraphic web site. Technically, tubing does not have a specific I.D. measurement. They have an O.D. and a wall thickness.....


Correct pipe up to 12" is measured ID and all tubing is measured OD with wall thickness as you stated.. I was just messing around a bit.. Have a great turkey day

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Old 11-25-2020, 04:41 PM
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