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Old 01-28-2012, 01:41 AM   #1
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Default 95R street car project

My daily driver and testbed for new widgets. The goal was to take our completely stock, high mileage and rough looking 95 R package we picked up in 2010 for $750 and turn it into a clean daily driver that should pass emissions testing in every state. The car will be autocrossed and used for HPDE (Miata Challenge) now and then. I was after a very clean, OEM look. No wild aero, pretty stock looking under hood. Scaled out at about 2180lbs with a splash of fuel.






IMAGES
http://949racing.com/95R/95R_2.jpg
http://949racing.com/95R/95R_engine_bay_1.jpg


Suspension
We fitted Xida-S with 700/400 rates. RB 1.125" #54105 front sway bar. Rear is the OEM 12mm with urethane bushings. Prothane control arm and diff bushings, SuperMiata end links. Diff is the stock 4.1 type 1 Torsen.

Brakes are OEM Sport Brakes with our two piece rotors and XP10's up front, XP8's in back, stainless lines all around with Motul RBF600.

The car has an NB front subframe and depowered steering rack.

Engine
We blueprinted an NB2 motor with Supertech 11.0:1 83.5mm pistons that were shaved down to create 10.5:1 compression. Supertech valve springs, SCAT forged rods and ACL race bearings. The rest is 100% OEM parts. We filled it with 5W30 Amsoil OEM street oil. Since this car has a metal core cat, we couldn't run a high zinc race oil without contaminating it. Exhaust is a custom built 2.5" stainless with a resonator and 16" Magnaflow muffler out back. ECU is a special Adaptronic 440 ECU configured just for this type of conversion. Thread on the ECU here http://forum.miata.net/vb/showthread.php?t=403239

Phase one - Emissions compliance
As an experiment, we initially built the car with an EUDM header and heatshield to retain a full OEM appearance and functionality. We also kept the OEM NA8 airbox and NB2 MAF. With all that OEM hardware and a cat, we squeaked out 126whp on CA91. Guessing another 2-3whp with 93 octane fuel as we were det limited when tuning for 126whp.

Phase two - make a little power
Next we added a K&N CARB legal 57-0348 intake kit. With that kit installed we made 131whp. Next we added a Racing Beat 56008 header and made 139whp. With the header, our emissions compliance went out the window.

We found however, that intake temps were still very high. The culprit turned out to be the plastic crossover tube. Plastic has high thermal inertia. It soaks up heat slowly but also releases it very slowly. Basically it heat soaks and stays hot regardless. We wrapped the OEM tube in foil tape and that slowed the heat soak noticeably. The next step was to replace the crossover pipe with an aluminum piece to try to get rid of heat a bit better. The only CARB legal intake we could find was a K&N 69-6000TP for a 99-05. This kit was a huge improvement in design over the questionable efficiency and safety of the snorkel intake of the 57-0348 NA8 kit.

The aluminum pipe helped a bunch. We went a step further and applied self adhesive thermal barrier wrap to the crossover pipe. Since the Adaptronic ECU doesn't actually use the MAF, we deleted that as well. It hasn't gotten on the dyno with the revised intake but I'm expecting about 145whp which was our project goal from the start.

For now the car has no oil cooler but we'll add a very small Setrab with -10 push on hoses and Mocal thermostatic sandwich plate. Koyo 37mm radiator and Koyo cap with M-Tuned reroute. It runs a bit to cool unless it's very warm out so we may add some block off plates for the radiator like we had to do with Crusher at T25.

Drivetrain
6 speed trans running Amsoil MTG. Clutch is a clutchnet stage 2 for 1.6 (200mm), organic sprung hub. Lightweight 8.8 lb Cr-Mo flywheel. 15x9 6UL's on 225/454 RS3's running about 26psi. I painted the wheels Ford tungsten gray code T8.

Miscellaneous bits
Harnesses are G-Force 5 pt camlocks. Seats are OMP Grip with custom made fixed brackets. Bar is a Hard Dog HC DD. Wheel is a Momo 350mm mod 78, NRG 2.5 QR and Momo hub.

We added V8 Roadsters subframe braces for added torsional rigidity. We'll some E-Code 55/65 halogen lights so we can actually see where we are going once the sun goes down.

John did a partial wire tuck under the hood. The relay box and ECU are behind the pax airbag cover.

Driving it
It's a hoot! The tuning and bit of compression give it excellent throttle response and torque way down low. The gearing and light flywheel let it zip through the gears like a kart. The ride with the 700/400 Xida-S is very firm but not harsh at all. Feels a bit lumpy at very low speeds but smooths out and begins to glide once you start hammering it. Exhaust is a bit too loud now so we're going to try a larger, heavier muffler. Brakes feel amazing. Super sensitive, tons of power. The XP's dust quite a bit but that's typical. That's it for now, I'm headed off to KINOD. SOCM Meet tomorrow night. Miata Challenge round 1 Sunday at BRP. Kind of a Miata thing going on..

Last edited by emilio700; 02-01-2012 at 11:25 PM.
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Old 01-28-2012, 01:48 AM   #2
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Nice write up, looking foreword to hearing more for sure.
How does the extra 20 or so horsepower feel? Have you done 0-60, 1/8 mile, 1/4 mile or anything like that?
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Old 01-28-2012, 02:07 AM   #3
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Quote:
Originally Posted by Gearhead_318 View Post
Nice write up, looking foreword to hearing more for sure.
How does the extra 20 or so horsepower feel? Have you done 0-60, 1/8 mile, 1/4 mile or anything like that?
Dyno and lap times are the only measurements I make. The rest is of no real interest to this driver.
Stock 95 weighs about 80lbs more and makes about 102whp. This makes about 145whp so more like 40whp gain. It's nothing like a stock R package to drive.
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Old 01-28-2012, 02:12 AM   #4
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Sounds awesome, pictures aren't working for me though.
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Old 01-28-2012, 02:24 AM   #5
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Originally Posted by emilio700 View Post
Dyno and lap times are the only measurements I make. The rest is of no real interest to this driver.
Stock 95 weighs about 80lbs more and makes about 102whp. This makes about 145whp so more like 40whp gain. It's nothing like a stock R package to drive.
Well sh*t, thats even more impressive. How much would these 40 horsepower set a person back?
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Old 01-28-2012, 03:27 AM   #6
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Well sh*t, thats even more impressive. How much would these 40 horsepower set a person back?
Any number of ways to find 40whp. I didn't add this one up but you can go through
the first post and get an idea.
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Old 01-30-2012, 02:30 PM   #7
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Default It's fast

Just got back from Miata Challenge round 1 at BRP. We dyno'd there at the track and weighed it on our scales. 142whp and 2180# with half a tank of fuel. With Rs3's we went almost 2s under the existing lap record. I consider than a full win for the project. Full interior daily driver with a cat and street tires running well under SM records with essentially a stock motor. Really pleased with the way this thing has turned out.

As the title sponsor of the series, I don't run for points. The car, without a fire bottle, was 11.75 pts so just squeezed into Mod. It would have won mod by about 4s and Super Mod by .1s.
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Old 01-30-2012, 02:54 PM   #8
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Cool, this is the same route I'm going with my 1994 daily driver, but 2550-2625lb with driver, lol.
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Old 01-30-2012, 03:17 PM   #9
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Cool, this is the same route I'm going with my 1994 daily driver, but 2550-2625lb with driver, lol.
The extra 250# should be cost you about 1.5s on a typical 2.5mi road course. So running NT01's instead of RS3's and you're still under SM records.

TSE's "Rover" is also a full interior, uns-stripped DD style HPDE car. It's making 130-135whp, 5 speed 4.3, 225 NT01's. We scaled it yesterday too and it's comp weight would be around 2450#. It was nearly as fast as the 95R, doing 2:03.6's IIRC. So still under SM records.

I think Rover still has almost all of it's A/C hardware. So a mildly breathed on N/A build making closer to 145-150whp and NT01's would still get you well under SM records while maintaining some creature comforts.

We figure the 6 speed in the 95R was worth some speed as much as the extra power and reduced weight from Rover.

Bottom line is is doable. Simple N/A power, full interior, A/C, <SM lap records.
Whoulda thunk.
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Old 01-30-2012, 04:24 PM   #10
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I hate you Emilio. I was perfectly happy with my 94 A package with Illuminas/FM springs that I drive around on the weekend, but now you have me wanting more. I already have too damn many projects.

The car sounds like a very well balanced, capable machine. I'm jealous.
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Old 01-30-2012, 04:31 PM   #11
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Quote:
Originally Posted by emilio700 View Post
Just got back from Miata Challenge round 1 at BRP. We dyno'd there at the track and weighed it on our scales. 142whp and 2180# with half a tank of fuel. With Rs3's we went almost 2s under the existing lap record. I consider than a full win for the project. Full interior daily driver with a cat and street tires running well under SM records with essentially a stock motor. Really pleased with the way this thing has turned out.
Quote:
Originally Posted by hustler View Post
Cool, this is the same route I'm going with my 1994 daily driver, but 2550-2625lb with driver, lol.
Quote:
Originally Posted by emilio700 View Post
TSE's "Rover" is also a full interior, uns-stripped DD style HPDE car. It's making 130-135whp, 5 speed 4.3, 225 NT01's. We scaled it yesterday too and it's comp weight would be around 2450#. It was nearly as fast as the 95R, doing 2:03.6's IIRC. So still under SM records.
First, very cool concept and execution.

I can't see the pictures here either, but I found the link on M.net. I can see that the engine bay is pretty spartan but no real shots of the interior. I assume the race weight was with no top of any kind? I'm guessing 2180 is about ~100 - 120 pounds light of an average NA8?

Quote:
Originally Posted by emilio700
Bottom line is is doable. Simple N/A power, full interior, A/C, <SM lap records.
Whoulda thunk.
Funny to see different interpretations (probably rooted in skill sets and resource availability). Emilio sees "essentially a stock motor" and "simple N/A power." I see "engine swap, built motor and standalone ECU."
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Old 01-30-2012, 04:39 PM   #12
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Actually, what I took from Emilio's post is that there is a lot of normally aspirated power to be found on these cars with some simple bolt ons. Sure, the engine is built for reliability, but that's not where the power is coming from. Clear description of mods + step-by-step dyno results FTW.

Robert, I just gave you some money (thanks for the parts, BTW), so you don't have any excuse. More projects!!

Thanks for the post, Emilio.
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Old 01-30-2012, 04:58 PM   #13
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How does the car feel in comparison to a turbo car with similar power? I like the idea of being able to build a car one piece at a time. And how'd you get the weight down?
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Old 01-30-2012, 05:05 PM   #14
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Jealousy consumes me!
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Old 01-30-2012, 05:07 PM   #15
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Quote:
Originally Posted by hornetball View Post
Actually, what I took from Emilio's post is that there is a lot of normally aspirated power to be found on these cars with some simple bolt ons. Sure, the engine is built for reliability, but that's not where the power is coming from.
There's another example.

I'm sure Emilio will clarify, but I don't think he would suggest you will see ~140 whp on 91-93 octane pump gas with a K&N intake and Racing Beat header on an otherwise stock NA8 nor will you see 2180 pounds in a mildly lightened NB2.


I think the beauty is in the integration of all the different elements and the success of accomplishing the original goals of a fun street car that puts down sub-SM record laps at his local tracks (likely with very high durability).
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Old 01-30-2012, 07:38 PM   #16
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Quote:
Originally Posted by Scrappy Jack View Post
First, very cool concept and execution.

I can't see the pictures here either, but I found the link on M.net. I can see that the engine bay is pretty spartan but no real shots of the interior. I assume the race weight was with no top of any kind? I'm guessing 2180 is about ~100 - 120 pounds light of an average NA8?

Funny to see different interpretations (probably rooted in skill sets and resource availability). Emilio sees "essentially a stock motor" and "simple N/A power." I see "engine swap, built motor and standalone ECU."
Quote:
Originally Posted by Gearhead_318 View Post
How does the car feel in comparison to a turbo car with similar power? I like the idea of being able to build a car one piece at a time. And how'd you get the weight down?
Interior is stock. Other that part swaps that save some weight like Xida < OEM dampers, etc. the car has no significant lightening. It's light because it's a R package = No P/S, A/C, C/C, P/W, radio. OEM top. Only significant lightening mod was removing front and rear bumper supports which is about 25 # combined.

FIA seats and brackets are about 7# lighter each than OEM seats and rails. We added V8 Roadsters frame rail reinforcements so the weight savings on the seat is about a wash. Added a 45# roll bar. Stock dash. You get the idea, the car is not stripped or significantly lightened. This 95 R left the factory weighing about 2200 dry I'm guessing. It was just never heavy to begin with.

You'll make the same power with a healthy junkyard NB2 motor, I/H/E and ECU. Falling off a log simple and maybe $3500 total assuming you do the labor. Less if you have some parts laying around like an exhaust or intake parts.

$1200 NB2 junkyard motor
$400 Square top intake manifold
$550-800 ECU
$180 Wideband
$425 Racing Beat Header
$450 Exhaust
$150 Intake, DIY
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Old 01-30-2012, 08:05 PM   #17
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This sounds a lot like the silver NB rental formula. Nice build, pics broken though.

Last edited by EO2K; 01-31-2012 at 01:09 PM.
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Old 01-30-2012, 08:10 PM   #18
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This sounds a lot like the silver NB rental formula. Nice build, pics broken though.
Yup. Same sorta notion as the old rental but with greater attention to cosmetic detail and overall cost.
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Old 02-01-2012, 02:02 PM   #19
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Default MT.net inline images not displaying?

Quote:
Originally Posted by EO2K View Post
This sounds a lot like the silver NB rental formula. Nice build, pics broken though.
Broken links are MT.net issue. I embed images hosted on my server.
img tag - my server / dot jpg - img tag

MT.net vBulletin software saves those as attachments and puts them on their server. Now they don't display. If I re-embed images, they display for a while then disappear. Nothing I can do about it on this end.

I'll embed them here again as inline images and see if it sticks.




http://949racing.com/95R/95R_2.jpg
http://949racing.com/95R/95R_engine_bay_1.jpg
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95R street car project-95r_2.jpg   95R street car project-95r_engine_bay_1.jpg  
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Old 02-01-2012, 02:35 PM   #20
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Nice car Emilio, I like seeing these NA power builds.
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