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INTRODUCTIONS
I'm just an IT guy that stepped into the world of Miatas in '19, just eager to get back into sporty cars after taking a 9 year hiatus. A nerd by trade and always in search of learning something new. Anyway, enough about me. Let's talk about the car!
THE CAR - Mazdaspeed Miata Production#2928
It's an '04 MSM in Ti with 100k on the body. Zero rust, perfect platform to build upon. Was originally a Redlands, CA car imported into Canada. Completely stock as far as I was aware when I took possession in 2019.
BASELINE
The car over the initial 2 years of ownership has gone through all the upgrades any typical thrill seeking owner would go through. It's got the whole nine yards, injectors, fuel pump, FM intake/inlets, intercooler upgrade, MS3, etc. After picking up the core concepts and fundamentals of MS3 and alongside my obsession with map tuning (I used to tune STI's), it's now at 13.5psi (14.2psi in cold temps) on the stock block + IHI using progressive PWM boost solenoid control. Pushing about 230whp+ on 94octane (no e85 here) with pretty aggressive timing for this street only build. Injector duty is at 83% at peak boost so needless to say I'm now turbo limited.
GOALS
Go fully forged block with VVT + EFR6758 and see what power levels pump gas would yield safely.
I'll be reserving some posts down below to break down the individual components and areas that I'll be building.
FYI - I run a 6758 on pump 93 (best we have here) with colder plugs and am detonation limited to 18psi, I do not think you will see 20-22psi safely on pump gas -- Though Andy Floyd here runs a similar garrett turbo around 20-22psi with 93 pump gas WITH octane booster. You will likely need bigger injectors, the PSI is not as important as how much air is flowing and an efr flows a lottttt more than the IHI, but again from my experience at 18psi I see around 60%duty on 1000cc injectors and a dw300 pump @60psi fuel pressure
FYI - I run a 6758 on pump 93 (best we have here) with colder plugs and am detonation limited to 18psi, I do not think you will see 20-22psi safely on pump gas -- Though Andy Floyd here runs a similar garrett turbo around 20-22psi with 93 pump gas WITH octane booster. You will likely need bigger injectors, the PSI is not as important as how much air is flowing and an efr flows a lottttt more than the IHI, but again from my experience at 18psi I see around 60%duty on 1000cc injectors and a dw300 pump @60psi fuel pressure
Interesting, thanks for chiming in. What compression did you go with for the pistons?
I deliberately went with the 8.5:1 Wiseco's so I will have some timing wiggle room with our fuel. But of course, the turbo psi is something I've just pulled out of the air. I won't know till I get everything in and start tuning to be sure!
Ordered the top mount Kraken EFR manifold and 3" DP.
The race is on to see whether Bulgaria will be faster than US to Canada.
DHL is amazing, my kraken order made it from Bulgaria to Rochester NY faster than a moss miata part from California that shipped a whole day before the kraken parts... took something ridiculous like 3 days total from when I received the shipping notification to wiping the drool off my freshly opened parts. Enjoy
DHL is amazing, my kraken order made it from Bulgaria to Rochester NY faster than a moss miata part from California that shipped a whole day before the kraken parts... took something ridiculous like 3 days total from when I received the shipping notification to wiping the drool off my freshly opened parts. Enjoy
That's great to hear.. too bad I actually need the off the shelf parts (pistons) from Fab9 first for the machine shop.
EDIT: VS855's are out of stock and went with ST dual heavy springs
Ordered a set of VS855 valve springs for the head and as well as OEM valve stem seals. Will start on the mild port and Polish as I'm waiting for parts to arrive in the coming weeks. Unfortunately no ETA or communications yet, but I'm hoping the head will be done by the time my Fab9 order comes in to get my block work started.
The reason I ended up deciding on heavier springs is because I will probably want a slightly higher redline to stay in boost longer from the lower compression (8.5:1). I do also like the idea of extra security with the stronger springs.
Plenty of threads I've read on here and miata.net on this subject. But I'll open up the question here for if anyone feels like sharing.
"What are your experiences with low compression, VVT + higher boost application?"
Kudos to FAB9 (thanks Bryan) - got my shipment out with an ETA in my hands sometime tomorrow. ARP main and head stud stock is no where to be seen, there looks to be a global shortage.
I will finally have my rods and pistons to get the bore, hone and decking onto my machinist's docket.
Massive update with the parts ordered and received.
ARP Main studs should arrive this coming week, then off to the machine shop.
I decided on, and ordered a set of Supertech double coil heavy valve springs (74lbs) in place of the out of stock VS855 Volvo springs. I figured I'd want that extra security from valve float as I'll be doing a lot of RPM to boost trim tuning with this setup. Last thing I want is to be close to my power goals and the stock RPM limit becomes the limiting factor.
ARP Head Stud Kit (218-4701) is still elusive and out of stock everywhere from reputable sources. I'll keep checking from time to time. Fingers crossed!
Just for kicks I've done some virtual dyno comparisons between different psi's on the stock MSM IHI turbo. I'd say it validates what I've been reading that around 240whp and at 5k RPM is right where the IHI falls short.
The plot below is with 94 octane gas running 17.8 timing in the higher RPM ranges without knock. I've had to really put in some aggressive wastegate duty to keep that little turbo hold consistent PSI in the higher ranges.
Can't wait to have a new turbo to tinker and play with!
DHL is amazing, my kraken order made it from Bulgaria to Rochester NY faster than a moss miata part from California that shipped a whole day before the kraken parts... took something ridiculous like 3 days total from when I received the shipping notification to wiping the drool off my freshly opened parts. Enjoy
Absolutely right Dr.Sep. Kraken shipped out my DP and Manifold on Tuesday and I got it today. My mind is still blown it got here in 2 days!
I'm in love with the Turbo to DP turn down welds (back purged). Absolutely beautiful.
FAB9 has been great as well.. ST valve springs arrived
First off I'd like to thank Kraken for dealing with me. Crazy honest guys over there and I must admit, they handled my neediness like a champ.
Quick update:
Ordered my Kraken 3" exhaust with the Simons muffler, looks like a great quality piece. Simons aren't common this side of the pond but from info I did find they fit the bill for what I'm looking for sound wise. I'll definitely add in some sound clips once my build is up and running.
I have been researching more on spark and fueling, and ended up ordering a new set of ID1050X injectors. The 255lph deatschwerks I have should provide what I need for my goals anyway. Worse case get an upgraded unit and regulator if there are any problems. I'm still not convinced that I need dual feed but if any of you out there have anecdotal experiences saying otherwise I'm all ears!
Build is coming together, the EFR6758 coming in the next week or so along with the turbo blanket. ARP Head studs are being "fulfilled" but I'm still hopeful.
At least the the FM spring compressor is coming in this week so I can at least finish the head work as I'm waiting for more parts to arrive. I'll post some update pics as I make some sort of material and tangible progress and not just a lighter wallet. Lol
06-21-2021 | 02:49 PM
EFR MSM that goes..... _oom?
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