Robert Im-Glück

Hi I'm new on this forum, my name is Robert I'm from germany, and sorry my english is not the best as it was sometime before..
Im driving a 93 NA 1.6 115PS Miata and i bought an 99 bp4w nb 140ps engine. i brought the engine to an engine builder, i allready have oversized valves(1mm and 0,6 longer then the originals from supertech), he resurfaced the head and the engine block, "bored" out the valve seats, to the new valves, i ported and polished my head by myself, took away alot of material at the exhaust side. and he balanced my crankshaft So my plans are are fully rebuild engine like every part.

High compression pistions 11.1 + new rings( dont know which company)
H-Camrods ( dont know which company)
Every bearing stronger in my engine.(very bad english I'm sorry..)
double valve springs(supertech)
race hydraulic valve lifter(super tech)
High cams (Adjustable)
light flywheel
boundary oil pump
Toyota COP's
brake upgrade
BC Racing suspension
15' or 14' jr wheels
6speed
cooland reroute
now the most important and difficult of the part : ITB's..

So pretty much every part will be made new.

Now my questions are maybe littl bit stupid bit i dont know anybody in germany how did an itb build on a miata..

- How high can i get on my cams so it will idle "well" for itbs( nb is original about 250 degrees i think?)
- itbs i think its best to go for 40 mm?
- the valves are 0.6 longer then the originals how to get this done? miata is a engine which will not get destroyed if the cam belt flips over so how to adjust it?
- how to degree cams? unfortunatly i dont know anybody if i search in the internet its hard to understand.
- which is the best side to buy engine parts for the miata in the states? or in britain, in germany you pay double the price. i found fab9 and i think that would be fine but maybe there's a better one.
- the rotation angle sender(hope you understand this one.. the one of the back of the valve cover to adjust the timing) is on the bp4w on the left side, on the miata on the right. could i just fit the na in the nb engine and get it on the ecu? how to adjust that?
- how light can i go on my flyweheel too keep it streetable?
- which exhaust manifold would you prefer?(katalysator will be deleted and 2,5' exhaust would be the best i think)
- which companys are good for the camrods and pistions.. thought on supertech + carillo
- would you prefer 14' or 15' wheels for such a setup, im driving more like canyon runs i think 15'
- street clutch maybe stage 1 or 2 would be better i think but i better ask. its not that much horsepower.
- is there any information how to set a doubler weber carburator? i will make it at a pro shop but will learn it by myself.

So thank you for answers, I read a lot in this forum about itb's but i never found pages about full engine rebuilds unluckily, maybe my english is just too bad..
I know its a lot of work for maybe only 40-50 realistic real hp, but i love it to work on cars and engines and i think its more than just turbo cars its getting to mainstream.
I love the agile manner of the mx5 you dont need to have that much hp in this car i think.

Have a nice Day

NiklasFalk

iTrader: (1)

45mm Jenveys and 305/295 cams here.
The longer valves is a help since you grind cams with a smaller base circle.
11:1 is a little low for NA, my builder asks for about 12.7:1 for our 98 pump gas. 100 or 102 is available near you iirc.

My idle is not bad at around 1100 rpm, but without idle control it feels really old-school at the street (like a tuned Opel from the 70s).

albumleaf

iTrader: (7)

Skip the garbage BC Racing suspension and buy Xidas.

What ECU are you going to be running?

15" wheels will give you a much better choice in tires, so I'd stick with 15x8s or 15x9. 949 Racing 6ULs are a popular choice. Cheap & light.

sixshooter

iTrader: (12)

Robert, Wilkommen!

Wo wohnen Sie? Put the city and country in your profile so it shows under your name when you post so people answering your future questions will understand. There are differences in the MX5 in other parts of the world.

So many questions...

You do not want hydraulic valve lifters. You want "shim under bucket" mechanical valve lifters. They have less weight and will be better on larger camshaft lifts.

As Niklas said, Jenvey makes the ITB system for electronic fuel injection. Weber makes the carburetors if you are thinking "oldtimer", but there will be worse idle and fuel mixture will be less good when you change altitude in the mountains. Electronic is better.

949 Racing (California) has a lightweight flywheel which is very light for naturally aspirated quick revving and is OK for street. Miata Flywheel BP

949 Racing also has big brake kits in different sizes. Miata Big Brake Kits

As Albumleaf said, the best suspension for performance in the Miata is Xida. The GS is the street version. Coilovers

The most common ECU for Miatas is the Megasquirt. The latest version is the MS3. They can be sourced in Europe from MS Labs (a vendor on this forum, check the paid vendor section) and custom built to your needs. MS Labs is in Greece.

I don't have time for your other questions right now, but viel gluck! (no umlaut on my keyboard)

Robert Im-Glück

Hi thank you for your answers.
Im going to buy and jenvey kit, the german name is only popular as weber I'm sorry, and yes ofc i will buy sub lifters thought i wrote that.. from supertech.

On the ecu im really bad. wanted to buy a ms2, but i really dont know which is a good ecu to tune, and im not able to tune it by myself, exept i would go into that and try to learn it..

Xida? never heard of that, okay thank you very much.. in germany its said bc racing would be the best suspension for miatas!

Where to buy 305 degree cams?? the highest i found was maruha about 280's..

Thanks alot!

sixshooter

iTrader: (12)

MS2 is not bad but the MS3 is even better. I learned to tune it myself, starting with a base tune and making changes as I learned. This forum can be very helpful with the tuning. And we have members here from Germany who may be helpful auf Deutsch.

I lived in Augsburg for two years when I was a younger man. Lovely place.

albumleaf

iTrader: (7)

I think once your colleagues have sampled Xidas (assuming you buy them), they will change their minds.

Regarding ECU, if you don't plan on tuning it yourself, find out what has the best support locally for the Miata application and just buy that. There's a fair amount of reading involved to learn how to tune/set up a Megasquirt, and given that most of it is likely in English it's going to be a bit of a pain for you.

Cheers & welcome.

Robert Im-Glück

Okay thanks than i will try to learn it by myself! Yeah i know augsburg ist very beautifull.. i live near munich
so and the 0,6 mm longer valves will that be a problem how to adjust that?
and which pistons and conrods would you prefer?

sixshooter

iTrader: (12)

You can get the supertech Pistons Hand Forged connecting rods from 949 racing if you want to buy everything from one location. But if you are looking for very high compression then you may need to get custom pistons.