Project 'sillyteg'
- Thread starter DreXeL
- Start date
It would never pass MOT in a million years though. I'm supprised that after all this work you are only planning to use it on the road anyway, I would have thought you would have tracked it a couple of times at least. There is no way in hell that a screamer like that is going to pass noise regulations 
Of course it'll be tracked, mainly at Castle Combe where they rarely have drive-by noise testing, and the wastegate won't open during a static test so it should be fine. Besides, it's only a 38mm wastegate, 38mm screamers aren't that loud.
As for the MOT, that depends on how friendly the tester is
As for the MOT, that depends on how friendly the tester is
Soldato
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Not sure about that manifold Drex!
Still, look forward to seeing it done
Cos its not JDM bling?
Ramhorns are awesome but I didn't want to lose my A/C and P/S. My manifold is an exact copy of the Blox cast manifold (which is proven to work well), but only cost me ~£100 shipped.
Cast manifolds aren't pretty, but they work, and give better spool characteristics than tubular manifolds. Sure, they don't ultimately give as much top-end power as a tubular items, but you can get over that by turning up the boost
Cast manifolds aren't pretty, but they work, and give better spool characteristics than tubular manifolds. Sure, they don't ultimately give as much top-end power as a tubular items, but you can get over that by turning up the boost
The energy of the exhaust gases (flow and heat) are contained better.
If you use a tubular manifold, you lose temperature and the longer primaries slow the gases, giving them less energy when they hit the turbo.
*n
Why not?
I know a guy who had a turbocharged Hillman Imp.
The exhaust was literally 8" long, came straight off the turbo and exited through the boot lid. The screamer ran parrallel to it.
That passed fine.
*n
By how much though, an actual noticable measurable amount?
Just not able to heatwrap it to get around this if it is a problem?
its still better to get it straight into the turbo as fast as possible.
loving this project
Yes.
Heatwrapping would keep the temps up but they'd still drop as they travel along the manifold.
The gases will also slow as they travel along the manifold; wrapping the primaries wouldn't help here.
Ultimately, you want the distance between turbo and engine (on both hot and cold sides) to be as short as possible.
*n
As penski said, it's not just about heat, it's about distance and total volume to fill before the gasses hit the turbine. In a small cast manifold the gasses have bugger-all distance and volume to fill before they hit the turbine.
Soldato
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Wow, youve changed your side on that one and sounds pretty similar to what i posted a while back
Yes those ramhorns things are total overkill for anything used on a road more than once a month. Minimal volume is far more preferable for anything involving transient engine load, not a 11 second 'pull' at a drag strip.
Tim, i know its not JDM, just wanted to understand the reasoning why you were'nt sure, the bling factor was the only reason I could think of. Turboing Hondas in Japan isnt as influential on the UK market anyway due to the language barriers compared to the huge market in the states.
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Have I? I seem to recall saying that a 'log' style manifold was preferred for most applications due to energy retention and low-volume design.
How is that contrary to what I've posted above?
*n
Wow, youve changed your side on that one and sounds pretty similar to what i posted a while back
Yes those ramhorns things are total overkill for anything used on a road more than once a month. Minimal volume is far more preferable for anything involving transient engine load, not a 11 second 'pull' at a drag strip.
Are you now saying I was right in this thread and it is in fact you who has changed sides...
:/
*n
Soldato
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Its a bit different when your comparing bike engines in a kit car to a road focus'd VTEC car. Preferable means you can based either choice on what you require, lag is agricultural traction control for a little RWD i guess.
Just those VTEC ramhorn things are massive, and the amount of heat in the engine bay is a big concern IMO. Not an issue on that kit car.
I must have got confused and not got confused, seems youve always been an advocate of a log manifold. Turbos work on pressure mainly rather than airflow... unless you have bike cams
That blox item is pretty good, central WG, high Nickel cast iron made at the same place they do the Nissan manifolds.
Just those VTEC ramhorn things are massive, and the amount of heat in the engine bay is a big concern IMO. Not an issue on that kit car.
I must have got confused and not got confused, seems youve always been an advocate of a log manifold. Turbos work on pressure mainly rather than airflow... unless you have bike cams
That blox item is pretty good, central WG, high Nickel cast iron made at the same place they do the Nissan manifolds.