Hello, so I have a 95' NA Miata that I have just purchased an AVO turbo kit for, my car already has a Haltech elite 1500 ecu so the electronics side is good to go and I have already purchased (but not installed yet) my supporting upgrades like clutch and fuel system. However I am now having second thoughts, my original idea was to go big on the fuel system so I could future proof myself when I eventually want to rebuild the engine and make it flex fuel, however now I am second guessing myself and I am wondering if I went waaayyyyy overkill, the following fuel upgrades I have bought (Mind you I am based in Australia)

MX5 Mania
- Deatschwerks 1000cc Injector Kit - Injectors Set (NA/NB 1989-2004)
- e85 Fuel Pressure Sensor 3-Wire 1/8 NPT
- Radium Fuel Pressure Regulator With 3.0 Bar Bosch Top - (NA 1989-1997)
- Radium Fuel Rail (NA8/NB 1994-2004)

Car Mods Australia
- Deatschwerks Fuel Pump Hardwire Upgrade Kit
- AEM 340LPH E85-Compatible High Flow In-Tank Fuel Pump - Offset Inlet

I understand that obviously the car still needs to be tuned however have I messed up and gone too extreme or do I need to buy more that is less extreme? My current goals are around 200ish hp while still on stock internals, I just wanted to future proof myself for the long term.
Thankyou

 

Welcome, fellow Aussie!

Here you will find two 'stickies' that you should read and comprehend. What part of the country are you in - might help if you completed your profile, there are a few of us here.

Did you talk to David before you ordered, he would have steered you right. Mania built my engine, I'm happy with what they did.

You haven't said what you will be using the car for, nor the power level you are chasing - though those injectors may hint at it. That is useful information for anyone reading your post.

Pending that info, I will only remind you about the first point of failure boosting in these engines - the weak rods.

 

Hello, I probably should have read the sticky but I did some basic research, I have also talked to the person who is going to tune the car and I showed him the list of what I wanted before I bought everything. I did originally have 700cc injectors however he suggested to go for 1000cc if I wanted to future proof myself for a flex fuel setup. (I just have this dreadful feeling inside of me that it's still too much so I wanted some more opinions is all I guess) im aiming for around 200whp atm before I eventually do some more upgrades and go ethanol. I am based in North QLD so it's only a small community up here with little support but it is doable. The car is I guess a half daily with the option to still have some fun drives or road trips (I also have a motorbike on the side that I use regularly and options for more cars if anything goes wrong). Also my dad is an ex mechanic so we were going to install everything ourselves and just get the tuner to do his thing aswell as a quick lookover to get things good and running. Cheers

 

There are a few bananabenders here, but maybe not so much up your way.

For road use, and not-insane power, you may have gone a bit overboard. Flexfuel is hugely dependent on the availability of the stuff, without having go to absurd lengths to find it. With all the sugar cane up there, you are probably better off than we down here.

The only suggestion I would make is either an oil pump, or a crank damper - or both! For road use I'd throw a damper on it and call it done - the extra vibration from the bigger bangs when it fires can lead to oil pump problems, and the damper addresses that issue. I did both but my use-case is more demanding: high power and track use.

As will see from reading here, boosting the BP is pretty well formulaic these days - follow the menu and drive away happy!

Oh, photos ir it didn't happen! And maybe think about starting a build thread?

 

E85 is pretty easy to find here, not too expensive either so that's a plus in that sense. With Australian Consumer Law being pretty damn good, I should be able to return what I bought and trade down. What would you suggest I get instead if I was to go that route? Still somewhat being a future proof but more adaptable to road use / on​​​​​​ly on 98 for the time being

 

Having basically just done this whole thing twice...

Is the current setup overkill? Mostly likely.
Is it going to hurt anything? Probably not.

The setup you've outlined is probably good up to nearly 500 WHP on E85 and much more on pump gas. IMO it's worth spending a bit of time figuring out what your power goals are and then build the car based on that. I just added flex fuel and see no reason to run 91 (US) aside from E85 being hard to find here.

First limiter power wise is the engine and then the transmission (assuming a 6 speed). It sounds like you're planning to build an engine at some point so assume 250+ WHP. If you're not planning on swapping/building a transmission then keep your power goals around 300 WHP or so which is plenty.

Aside from spending more money than you need to, I don't see an overdone fuel system as a concern considering you have all the right parts..

 

Currently I have an Aus delivered 1.8L NA8 and everything is stock internal wise, the transmission is also currently a 5 speed and I have the 1.8 Torsen dif. I know that these are currently the weak points however after awhile (and some money saved) I'll upgrade the trans and dif when I rebuild the engine (Might as well go all at once). I talked to MX5 Mania today where I sourced my fuel related parts from and they are happy for a return in exchange for store credit (or 15% restocking fee on a cash refund). So should I downsize given the option or should I stick where I am currently?

 

Nobody's going to tell you if you should downgrade without knowing what your goal is.

Over 300 WHP? Stick with what you have. Under 300 WHP and need some money for other stuff? Considering downgrading. At this point downgrading is going to be a chore it sounds like, so consider what that's worth to you.

Personally I would probably get the turbo kit before the fuel system. The stock fuel system on an NA can probably run a 2560 to wastegate pressure without issues. Upgrade the injectors (with something future proof like the 1050's) and you should get to ~200 WHP on pump.

You've thrown a lot of money at a fuel system that you won't benefit from for a long time. That's not a bad thing necessarily, but it's probably not how most people would go about it.

 

Would it be an idea to possibly add just the injectors and tune for that and keep other fuel items stock for now until I eventually need them?

 

DW200 and 700cc injectors will support 300whp on pump 98, E85 better go with 1000cc

 

Yeah, I don't think you are so far out of the ball park that sending stuff back is required. You just may have purchased more headroom that you need immediately, and given the almost universal tendency to chase more power you are well placed for the future. But if funds are an issue, listen to the advice above, read those stickies, and then decide. Remember you still have the weak rods in there, and you want to deal with that before they take the matter into their own hands - my build thread describes my experience with them, and getting away by the skin of my teeth from a possible destroyed engine.

No need to worry about the diff you have, it is the little NA6 diff that is the weak one, and the torsen is fine - maybe not the bees knees on the track or really aggressive 'mountain driving', but in 20+ years of fast road and tracking MX5s I have only ever used torsens. You may want to play with ratios, and there are a few available, but I'd suggest leaving that until you start experiencing the limitations of whatever you have in there now.

The 5-speed will need careful handling - I'd make that my first non-engine-related mod. But that will then be the next limiting factor as you ramp up the power - again, put the 6-speed in, keep the power out of the danger zone for that box, and you will still have a bloody fast car.

But most of all, do the research so you are not totally dependent on what internet randoms like me say. Read the stickies, read the build threads, talk to your tuner, talk to Mania (David). Get a feel for what you want, what that means in hardware, what are the weak/problem points, and how do you deal with them. The info is here - the stickies - and search - are your starting point.

 

Thankyou <3