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The (boring) tale of OGK goes back to the founding of our company 18 years ago. Originally conceived as a lightweight, N/A time attack car (stupid idea), it has morphed into a roofless BP turbo HPDE toy. Now on the second tub, we dragged it out from under the tarp, cleaned out the rat poop and started bolting expensive parts to it. New goal is to have it ready for Miata Reunion at Sonoma in October, which I give a 15% chance of achieving. Nonetheless, we're working on it again and it will get built as Hustler is my witness.
Thanks to customer Derrick Major who finished and dialed in his roofless NB Kswap a while back @trackdaddy_ . Pics and videos from that build lit a fire under my ***. It is street registered in California so Cars and Coffee, KINOD and stuff like that should be fun. Should also be a hoot in auto-x.
Current outline, due to change at the drop of a hat, or few shots of whisky
SCCA/NASA legal open car cage with removeable main hoop front supports
Seam welded
2 seat
BP6D turbo with an EFR6258 tuned for maybe 400whp or so
fancy AZ6 from Walters Motorsport
SPM twin disc clutch
15x10s with 245/40 soup du jour
3.6 OS Giken
Xida Race 1100/500
lots of dry carbon and a few frp panels
minimalist console, Aim MXS dash
GT-1000 64" dual element APR wing
6" alumalite splitter with end plates
Singular spicy new fender vents
metallic orange paint, of course
interior, engine bay will be dove gray. Cage tubes painted body color
shorty polycarbonate windshield thing roughly the shape of OEM but cut down to about 8"
No hood vents because no radiator. I know, weird right?
Bits we're still missing
3.6 R&P but those are floating around
OMP HTE-R 400 seats
Engine. Shopped around a few builders and decided to have Keegan build this, assuming he's still building BP engines.
Kraken hotside bits. Michaels seems to a busy guy. I've been trying to send him money for a few months now. Anybody got a BP lowmount hotside for EFR F/S?
A odd few details
Radiator is rear mount just behind the rear bulkhead. Radiator is a low cost generic stock car radiator off Summit. The original idea was a custom nose with downforce producing features where the radiator support would normal be. Decided to simplify, expedite and reduce expense by sticking with a stock nose. Might still hack our radiator support to save weight though it has no airflow benefit since the radiator is in the back now. Rear of tub opened up to exhaust radiator airflow. Not sure what will weigh but a gutted NB2 HPDE toy with stock panels and no aero usually weighs around 2000 dry. All our bolt on panels weigh 22lbs total, no windshield, no front hoop on cage, no top, big chunks of tub cut out. Entire steel rear qtr panels replaced with frp junk off ebay. So maybe 1800lbs dry, 2000 with driver and some fuel. That'll give it a power/weight of around 5 on the high boost map. Last time I checked, that's pretty good. Anyway, enough blabbing, here are some images of its current state.
Primered a few years ago to stave off rust. Still rusted dang it. Loop on cage on LR is new filler pipe location.
Hood, trunk, doors are dry carbon and crazy light. From a dude in Australia about 12 years ago.
Rear qtrs are ebay chopper gun frp. Not light, but still lighter than steel and about 20mm wider
front and rear bumper skins are OEM but we'll hack away a good portion of them. Rear will eventually get some sort of diffuser. Front gets a traditional Crusher style HDPE air dam with only a small hole down low to feed the I/C.
This is a brace we designed years ago but never put into production. Weld in steel brackets, bolt in aluminum brace. Had a proto laying around so in it goes.
ebay panels in the fitting process. Gosh they are crap. Perfect for this build
Please please please add MK60 ABS, for funsies. You'll love it, even if all it does is save you from flat-spotting some expensive rubber. Heck, since you're not building to a ruleset, go for the MK60e5, though I'd need to check a few things to ensure it'll work with the Miata tone rings...
Please please please add MK60 ABS, for funsies. You'll love it, even if all it does is save you from flat-spotting some expensive rubber. Heck, since you're not building to a ruleset, go for the MK60e5, though I'd need to check a few things to ensure it'll work with the Miata tone rings...
Would be sweet but it's not within the scope of this project. We're doing quick n' dirty and on a budget. I've gotten pretty good at dialing in perfectly balanced brakes with great feel so ABS function in the dry is not critical. No plans to race it, just HPDE shenanigans.
Alex Renderos (Renderos Racing) is just finishing up his year long personal project car, an LM4 swapped 240Z on an NC chassis with Xidas. Motor is a honey. 5.3L all aluminum LS with stage 2 cams, tune, headers the usual. Probably making 450bhp and sounds perfectly nasty.
Since its an NC, it has the full NC dash. Interior is super clean. 6pt roll bar.
Carbon Miata FRP fenders. Little bit of GT style. Only composite fenders I could find that were a bit wider than stock. 245's clear stock NB fenders but just barely. These are +20mm IIRC
Kraken low mount and DP arrived. Mating to the standard iron CHRA .64 EFR6258.
Will send turbine housing and hotside bits off to get coated. Our experience has been that the thermal Coatings go a long way towards reducing the meltage of other goodies nearby, like my shoes.
Kraken low mount and DP arrived. Mating to the standard iron CHRA .64 EFR6258.
Will send turbine housing and hotside bits off to get coated. Our experience has been that the thermal Coatings go a long way towards reducing the meltage of other goodies nearby, like my shoes.
Dash just about done. Alex had to do some fiberglass patching to get the fenders to fit with the headlight, bumper skin and hood. Wing looks huge. It'll still be a miracle if we have it running for Sonoma but we'll keep plugging away regardless. Motor just about done. Cams didn't arrive in time so we're running stockers. Still enough for 425whp so not a big deal.
Motor just about done at Keegan. We skipped coatings in the motor to reduce costs a bit. Thermal management less critical on E85 anyway.
BP6D
CNC head
K1 rods
ACL bearings
Wiseco 83.5 9.0:1 pistons
Fluidampr
Supermiata 36-2 trigger wheel
Boundary oil pump +7psi
+1 O/S SS intake valves
+2 O/S Inconel ex valves
Supertech light double valve springs
Balance reciprocating bits
Circuit Sports oil pan baffle
stock cams
stock lifters. redline will probably be 7700
-10 & -6 AN bungs on oil pan for Radium oil separator and turbo drainback
Kraken hotside
EFR 6528, turbine housing and DP coated inside and out by Embee in Santa Ana
Qmax reroute
AMP EFI Maxspark IGN1A coils
#7 NGK Ruthenium plugs (I think)
The hotside already at Renderos, engine shortly. He needs it to build the custom 3" exhaust, fab the coolant hardlines coming from the back and a few other bits.
We have run similar engines and made and easy 400whp at around 22-25psi, which is what we're targeting with this one. Hope the Walters AZ6 will hold up since we sold the Quaife (which I regret).
It'll be interesting positioning the I/C and piping since there is no radiator in the way (its in the trunk). Which reminds me, I need to get a set of Moti's lowered engine mounts..
Still not likely to make Miata Reunion but I will say this.. it's still possible
Just got an email from Maruha. Cams/Subs ready sooner than expected. So, yay, we get cams. Only other F/I BP we ever built with cams was the 300whp BP6D 1.9L, CNC head, big valves and prototype C30-74 Rotrex.
I remember the crazy torque that motor had despite being a "torqueless" centrifugal blower. Word on the street is that some are putting 300whp through Walters 5 spds so fingers crossed the all -the-bells-and-whistles AZ6 will handle 400whp. If not, we would either do a G-Force dog box or start scouring the interweb for another Quaife.
The Maruha (Tomei) are 33mm base circle. OEM is 36mm. Anything past .370 (stock NB2 intake lift) required notching the lifter bores and clearancing the cam box. The smaller base circle allows .425 lift to fit a stock head. Duration is still relatively short. We have used these same cams in a bunch of N/A BP's and they deliver a great powerband without needing main bearing killing revs to make power. Woot.
06-06-2023, 05:23 PM
Resurrection?
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