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Just been knocking out little things step by step, started on the exhaust making a 3" downpipe (extreme noob)
FPR and fuel system complete, mounted on the overflow tank, never even seen a drop of coolant in it Looks pretty good here, prepare your eyes for the welded version Clears the wall nicely First time welding pls dont make fun of me hahaha
My welds were getting a little bit better at the end when I realised I didn't have to drown the puddle with filler rod
Back at it again after being overseas and coronavirus letting me finish what I started here. Got the exhaust 95% complete, just have to add some hangers and swap my bumper out for a cut one I have.
This week I'll route the intercooler piping and go for the first start soon!
Quick update here, after testing oil pressure to the turbo feed I found coolant mixing with the engine oil! Not too much but even after a couple engine flushes there is still coolant mixing with the oil... I've ordered a new OEM head gasket hoping this fixes the issue otherwise im thinking the turbo is internally leaking
I'm Not an engineer, but I think you'll be fine with that turbo at 350whp. I have a Garrett 2876R and my motor is low compression at ~8.5:1
The build was intended to make 350whp on 93 octane pump gas. To do that and have fairly quick spool was the goal.
It does what it was intended to do and makes 350 whp on 93 pump gas with VERY low timing. Boost is at 28psi to do this. Full boost is around 3800. If already cruising at higher rpm and flooring it, full boost is very quick. I drive the car at 10/10ths at some point every time I drive it. I take very good care of it and maintain it but I drive it hard. It has been dead reliable and has not broken anything to date.
six speed trans, flyin Miata stage 1 happy meal. (So far so good at 328wtq) and Torsen 4.10
I like your build direction...I think you'll be very happy with it when done..
I ended up changing that headgasket to OEM and it fixed my problem.
I redid the downpipe and routed an external wastegate dump and... Got it tuned! (sort of)
I got it remote tuned by Yianni @merlotmx5, and it idles great, just need to dial in the autotune.
The car is ROWDY! I need to actually turn the boost down, max boost I've logged is 280kPa ... 26PSI
I don't know how much power its making, I have yet to truly plant my foot and let it rip through the gears.
The butt dyno tells me its about as fast as my 135i, when I change the wastegate spring and get boost control going I'll be sure to get a virtual dyno run in. For now its too risky I just have no clue if its gonna send all the boost if I put my foot down 🤣
It makes some beautiful noises, it has scared me a couple times when the intercooler pipes blow off. My girlfriend has some good clips in the passenger seat Ill link
sorry for the lack of pictures I'll be sure to get some content when i fix the boost "problems"
I drove the car up to Brisbane , Australia last weekend to meet up with all the other mx5 degens. I was extremely nervous as this was the first time I was driving out of a 20km radius (I can get a free tow within 20km). To my relief it drove great and temps were perfect, which was a huge confidence booster. Logged the whole drive too so got lots of good data.
fingers crossed over Easter I can get it into the paint shop for a respray
This whole time I've been running an NA6 alternator with the NB8A pulley. TBH I never had any problems with it, my voltage with the na6 alternator was around 13.2v running, maybe a little bit low? what's your thoughts? anyways to the point!
60A wasn't doing it for me, I managed to find an EL series ford falcon alternator for $70 usd rated at 110Amps. I had to change the stock positive terminal eye connector to a larger size, and one of the pulley ribs is unused, but other than that its plug and play.
I say I never had any problems with the NA6 alternator because I thought it was the cause of my weird idle problems. Sometimes I start up the car and fuels lean, or sometimes its rich, even sometimes driving it just decides not to idle. I've had the thing tuned and thought it was due to inconsistent battery voltage. I now suspect its the DW700 injectors I chose... I've heard hundreds of bad things about these injectors and I'm ready to finally give in.
Theres a set of 640cc flow forces up for sale for $220 usd and I'm gonna grab those! I simply cant justify spending $500 usd for IDX1050s even though I really want them. I also would rather be safe than sorry, especially with how hard it is to get my hands on another 6 speed if this one blows. I suspect with the flow forces and my fuel pressure to be able to hit maybe 300whp. I hope you all still love me, and I'm gonna max out the flow forces regardless. Im looking forward to some drivability because tbh I dont like taking the car trips more than 20kms at the moment!
Last edited by skuse; 07-21-2022 at 05:09 AM.
Reason: added content
Fully sending it today with 100% throttle full boost tuning. Man the thing builds boost like a monster once the turbo starts spooling!
Hit a new (personal) record of 303kpa (29 PSI?) without any boost duty at 70% throttle. I better swap in a smaller spring before I blow the engine up LOL. Either the spring in there is just crazy stiff, or im getting some crazy boost spike (Ebay wastegate BTW). I'm still conservative on ignition timing until I get fuel and boost dialled in. I'd rather mess with that on a dyno, but good lord she gets down.
Heres how I've been going about tuning my fuel table at high boost. I start with something obviously rich, hit auto tune, it'll touch the rich cells and it acts like a little rev limiter lol. It will take some fuel out, enough for me to interpolate the cells around it, and eventually creep up from 10AFR to my target ~ 11.2 AFR. It's tedious but I am running stock pistons with some OEM piston rings.
At this point I'm still running the DW700 injectors, DW300LPH fuel pump and my fuel pressure is 5 bar or 72.5psi. Idle is rough, inconsistent and hard to tune.I'm waiting to bite the bullet on the FF640cc and I'm also looking into building a trubo kitty MS3X instead of mspnp2. Some luxuries like sequential ignition and table switching would be really nice as I already have en ethanol sensor and COP setup.
Smaller things I have planned first are:
Fixing the annoying exhaust rattle caused by the eBay 3 inch exhaust cutout -> just apply high temp gasket maker to where the shaft seals (not perfect but stops the metal on metal rattle, 80% good enough)
Tinting all windows with ceramic tint (I've had it unopened in the box for 3 years so hopefully it's still good)
Havent got it painted yet, I will probably end up wrapping it myself when I get some time
Taco taco is still holding up fine, never had any issues with it
The clutch is really light, amazing while driving, but needs revs to get it going. The lightweight flywheel adds a bit of complexity to the mix as well. I would buy it again for the pedal feel and how it feels while driving. (pedal weight it like stock maybe even lighter)
painted valve cover wrinkle black new wheels - konig hypergrams 15x9 wrapped in 225/45 rs4s
New wheel and tyre setup
I loved the RPF1s but I was getting a little bored so bought these 15x9 konig hypergrams, +35 from memory.
pokes out a little further than the 15x8 +25 setup but didn't need a re roll - full steering lock, highly recommend
These are wrapped in 225/45 hankook rs4s, initially impressions are it hooks up waaay better really happy with the wheel and tire setup
wheels: $1300AUD (~$850 usd)
tyres: $750AUD (~$500 usd)
Got a catch can setup to address the crank case pressure.
Before this i was running an open air breather on the hot side and the gtx turbo valve on the cold side.
Now I have a catch can intercepting the cold side and still running the breather on the right (the clear tube is temporary was just curious if anything was coming out)
So far so good with this setup, if needed I'll widen the holes and plug some AN fittings in.
Gave the car a much needed polish
looks a lot better and hopefully it'll last for at least a couple months
I think I'm going to try wrap it myself, starting with the roof which is in terrible condition
01-16-2020, 08:40 PM
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