Longtube manifolds for GranTurismo (and QPV)

[A.S. Motorsport]

Our equal length exhaust manifold project for Maserati is now in finally stage of R&D.
These should yield good performance gains over the restrictive stock short dented headers.

We're testing on a 4.7 GranTurismo right now, and roll out to others.
These are equal length featuring billet flanges with velocity stacks in the ports towards piping, 3D printed stainless steel collectors.

All full stainless steel, these will mate up to the X-pipe. (factory, larini, etc etc)
Pictured version has no catalysts, we're going to offer that as a option later on.

As far as model applications
We've got a lot of test engines here and we've bench tested prototypes on

• 4.7 F1
• 4.7 ZF
• 4.2 ZF
• 4.2 Dry-sump (this will be a different version, flanges and oil-filter clearance differs in that photo)

Future we'll possible make a variant for the California

I'll post up more detailed pictures and information later on!

 

[Zep]

That looks great. Would be very interested in the version with cats.

 

[Oishi]

Will the 4.2 drysump ones fit a 4200?

 

[TimR]

Will the 4.2 drysump ones fit a 4200?

What he said.....

 

[Greek]

Will they be able to bolt up to the Larini high flow cats or stock cats?

 

[A.S. Motorsport]

Will the 4.2 drysump ones fit a 4200?

No they would only fit 04-07 Quattroporte drysump
For the 4200GT we're looking in to having new cat pipes made, as we can still get the original long manifolds there is no real market for making a equal-length one.

 

[A.S. Motorsport]

Will they be able to bolt up to the Larini high flow cats or stock cats?

These will bolt up to the X-Pipe, as the merge collectors are past where the stock/larini cats would sit, hence we're going to make a cat version later on

 

[midlifecrisis]

Interesting/interested.

What's the OP take on adding ceramic coating to reduce temperatures in the engine bay?

 

[Bebs]

Very interesting, but I suspect the vast majority of owners would want a cat option rather than straight pipe/decat.

 

[A.S. Motorsport]

Hence we'll be offering a cat version.
As for ceramic coating, yes I do prefer to keep the heat in the exhaust system versus radiating out (like the stock system does)
The stock cat radiates so much heat is very common to see burnt chassis rails on GT and QP.

 

[Bebs]

Hence we'll be offering a cat version.
As for ceramic coating, yes I do prefer to keep the heat in the exhaust system versus radiating out (like the stock system does)
The stock cat radiates so much heat is very common to see burnt chassis rails on GT and QP.

Look forward to further updates, good work!

 

[Felonious Crud]

Interesting/interested.

What's the OP take on adding ceramic coating to reduce temperatures in the engine bay?

Where does the heat go, in that case? I mean, it has to go somewhere. Further along the exhaust?

 

[Mr S]

Is the problem with containing the heat, is that it can cause issues with cracking welds etc, as the heat just builds up rather than escape?

 

[Gazcw]

Where does the heat go, in that case? I mean, it has to go somewhere. Further along the exhaust?

Heats up the boot to sauna levels

 

[A.S. Motorsport]

Where does the heat go, in that case? I mean, it has to go somewhere. Further along the exhaust?

Ceramic coating reflects heat into the exhaust system, it effectively increases the temperature which aids the flow of gas as the gas density reduces it needs to flow faster trough a collector/merger (thermal expansion)
That can aid flow, once the gasses cool, you loose air speed (gas becomes denser and you can fit more in a given size) hence stock mufflers in a 4.7 would be fine as the flow rate is much lower there

That said you do actually need to factor that in this is how Ferrari's constantly crack headers as you're creating hot spots at for example the collector flange welds.
In our design this is already eliminated.

The flange as you can see is a solid billet block of stainless machined, there are oval to round ports cnc'd in to the flange (to improve port exit gas flow) and the runner pipes actually are slide in to a machined groove in that flange to make them:

• Flush to the port
• Much bigger surface area for the connection to be made
• Better fitment

It's the best technical solution, it does add machining work and labor but we want to make a as good as possible product

 

[A.S. Motorsport]

Other detail shot, the stainless printed collector and it's central spike, to package this as tightly as possible with the best smooth transition it's a printed piece with the primary O2 sensor metering AFR in the collector merger, (sensor fitting is printed as well)

 

[midlifecrisis]

Thanks for the above answer, if you were to add ceramic coating to your exhaust to increase flow would there be any power gain by reduced engine bay temperature? Basically the inducted air would be cooler and marginally denser.

Also could heat sinks be utilised to get rid of heat further down the exhaust length. This would help reduce the heat radiating into the boot. The impact of this, is cooler beer.

Yours MLC, the amateur thermal dynamist.

 

[A.S. Motorsport]

Thanks for the above answer, if you were to add ceramic coating to your exhaust to increase flow would there be any power gain by reduced engine bay temperature? Basically the inducted air would be cooler and marginally denser.

Also could heat sinks be utilised to get rid of heat further down the exhaust length. This would help reduce the heat radiating into the boot. The impact of this, is cooler beer.

Yours MLC, the amateur thermal dynamist.

There would be certainly a flow increase and in my honest opinion not reliably measurable on a chassis dyno.
That said reducing engine bay temp would go a long way in stopping the coolant hoses failing and valve cover gaskets drying out.

That said intake air, this is already a highly effective ram cold air intake from factory on 4.7S (different airbox vs 4.2 and 4.7 QP)

 

[Cyclone1]

Great to have these options from a reputable source. I’ve followed the progress / development of these on IG with you guys and the manufacturer and am impressed.
Jules

 

[Tallman]

So the big question is, how’s much bhp and torque improvement can we expect from this, ceteris paribus - or do you need to do other stuff to make full use of the improved outflow?