EUDM miata square top

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AndreyB
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EUDM miata square top

Post by AndreyB »

I've honestly tried googing but still a bit confused.

Which years of EUDM 1.8 Miatas are the holy grail square top intake manifold?

I know in US we have NA8 -4-97 which is one head, NB8 99-00 are the NP4W with VICS and 01+ comes with a different intake I believe.

What about EUDM - which years of NB8 are the square top?

What about NB6 intakes - are these compatible with NA6 heads? I know NA8 and NB8 heads are not compatible in this regard.
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stefanst
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Re: EUDM miata square top

Post by stefanst »

Sorry- no idea about 1.6l interchangeability. But it doesn't matter. All money spent on the 1.6l is money wasted in short order. Focus on the 1.8l.....
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Re: EUDM miata square top

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Re: EUDM miata square top

Post by stefanst »

The attached picture is my turbo 1.8l '99 Miata with VICS (red) vs. Squaretop (blue) intake, running the '99 head.

Mods that may play a role here:
- Turbo
- +1mm valves all around
- Removed EGR
- 3" Exhaust
- Running Megasquirt 3

Both runs were on the same road, with the same timing map. I was running considerably more boost, as can be seen in the graph, with the VICS manifold. VICS was running just over 0.8bar, ST was 0.65bar. If I had run the same boost with the ST, I'm confident torque below 5500rpm would have been essentially identical.
The ST is just much, much revv-happier. It just keeps making power all the way up to redline and beyond.
I will never go back to the VICS intake, if I can avoid it.
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VICS vs Squaretop.jpg
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DaWaN
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Re: EUDM miata square top

Post by DaWaN »

russian wrote:I've honestly tried googing but still a bit confused.

Which years of EUDM 1.8 Miatas are the holu grail square top intake manifold?

I know in US we have NA8 -4-97 which is one head, NB8 99-00 are the NP4W with VICS and 01+ comes with a different intake I believe.

What about EUDM - which years of NB8 are the square top?

What about NB6 intakes - are these compatible with NA6 heads? I know NA8 and NB8 heads are not compatible in this regard.
Yes, EUDM has a few differences compared to USDM and JDM.

As for the 1.8 it is pretty straight forward:
EUDM NB '99-'00 runs the same VICS intake manifold as the USDM, no VVT
EUDM NB '01-'05 has VVT and squaretop intake manifold

The EUDM NB '99-'05 also has a better 4-2-1 exhaust manifold compared to the USDM
The EUDM NB '99-'00 also runs a return line, only '01-'05 is returnless

The 1.6 lived on in the EUDM till 2005. All EUDM 1.6's have the bigger diff starting from '94, so the "1.6 will blow their diffs" standpoint does not really apply to >'94 EUDM 1.6's
Also the EUDM NB received the 1.6, which had a few changes compared to NA 1.6: the CAS was ditched (NB 1.6 run same sensors / ignition as the NB '99-'00 system) and it runs solid lifters.
Intake manifold is also different (and I am pretty sure they will fit the head), but I do not think there is much between them.

For my own MX-5 I acquired a complete '02 1.8 VVT car (including engine and squaretop) from a wrecker (which took off all the body parts and soft top) for the price you guys pay for just the intake manifold :lol:
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Re: EUDM miata square top

Post by AndreyB »

DaWaN wrote: EUDM NB '01-'05 has VVT and squaretop intake manifold
Sweet, thank you for confirming this!
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