MKTurbo kit on a grenade motor - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-11-2018, 11:55 AM   #1  
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Default MKTurbo kit on a grenade motor

So i've been driving my car around on Grenade Motor v.1.0 for a year and a half (BP4W dingle berry honed, ebay vvt pistons slammed in, head shaved .025). The car ran 9.1's @ 74.something in the 1/8th and around 150whp on bias ply slicks with the 6 speed and a 4.3 torsen. Seeing how luck was on my side for how poorly that engine was built I decided to tempt the fates again and build Grenade Motor v.2.0 with a turbo kit that is a blatant plagiarism of Sonofthehill. Please read my words with your sarcasm glasses on, I built this iteration in my driveway in 2 weeks to troll my friends who never finish their cars.

Grenade Motor v.2.0 specs:
  • BP4W: China forged h beams, cheapest ebay 94-97 pistons with sealed power chromoly rings, clevite rod bearings, new OEM vvt oil pump. Still has .025 head shave. It's been dingle berried twice now. Nothing was measured. Crank has never been out of it in two 'rebuilds' now so the mains are... probably good. I wouldn't build a motor this way if it wasn't for comedy.
  • Stock head with 94-97 valve springs. BP5A intake cam. Vics intake
  • Nb1 6 speed, 949 racing 4 Puck sprung clutch, 3.9 torsen
  • Turbokit: MKTurbo. I'm fairly certain i'm running the same turbo as Sonofthehill (.63a/r exhaust, .60a/r compressor with 3" inlet) ~218kpa
  • ECU: Rev built MS2, non-sequential
  • Fuel stuff: DW200 pump, FF640's, stock fpr, 93 pump gas
Set up has about 700 miles on it now. Made 285/225 tq this morning. We didn't use an ignition pick up on the dyno so the rpm's are a bit goofy (my rev limiter is 7400 but car makes peak hp at 7600 on graph). I'm seeing 17psi by ~4300rpm (will try to log soon to give spool data). Ran 2 12.9's last night @ 110. Be gentle on my timing map, I'm still learning!



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Old 08-11-2018, 11:57 AM   #2  
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Old 08-11-2018, 12:19 PM   #3  
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Very nice, the best part is trolling your friends who never finish their cars

I would suggest that you could achieve the same power with the .48a/r turbine housing and have it on by 35 or 3600 rpm. I might be willing to part with my smaller housing since I don't think I am going back.
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Old 08-11-2018, 12:33 PM   #4  
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The man himself! Would I have to swap exhaust wheels as well to run a .48 exhaust housing? Also, how far did you push your car on 91? 20 psi if memory serves?
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Old 08-11-2018, 01:04 PM   #5  
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If the turbo is the same one I am currently running, the exhaust housing is interchangeable. Although the .48 housing is a restriction and will take more boost to make the same power.
I think you are pretty close to the max, I have run more boost on 91, but I have nice forged slugs.
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Old 08-11-2018, 01:17 PM   #6  
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This is what I've got for reference:

https://www.ebay.com/itm/CXRacing-T3...item20ccf1da87
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Old 08-11-2018, 01:21 PM   #7  
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That is what I am currently running. It makes more power with less boost than the .48 housing, but comes on lazier, 4300 or so, like you said.
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Old 08-11-2018, 01:32 PM   #8  
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I honestly don't mind it. I celebrate the old school turbo powerband. It doesn't hit the tires as hard so this rig dead hooks from a roll (205/50-15 Federal 595 RS-RR). I dig it.
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Old 08-13-2018, 12:39 AM   #9  
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Me too, I still get 5psi or so instantly in top gear on the freeway, which is plenty.
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Old 08-16-2018, 11:30 PM   #10  
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Took the car out to the 1/8th mile tonight on my new set of Mickey Thompson ET Street R's (225/50-15).

Cliff notes: Best pass: 7.72 @ 89.11 with a 1.66 60'. (Car should do 11.999999999999 1/4's at this point)

I'm pretty sure Lars should start offering this turdbo that Sonofthehill and I are running with his kit (And for sure call it MKUltra) for those that want 11sec miatas.

Timeslips. I'm car # 05. 8.x passes trying to figure out how to launch the car
My collection of 7.x passes
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Old 08-17-2018, 02:19 AM   #11  
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Good job! I am curious if those tires rub on anything at all?

I have been thinking about bending a couple of the hangers to eliminate my slight bump on hard launch, just haven't got around to it yet.
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Old 08-17-2018, 05:23 AM   #12  
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It's a snug fit, but they fit with rolled fenders on 15x7 + 30 Kosei K1's. On 15x8 +25's that I originally test fit them on they rubbed the sidewalls on launches. I had the launch control set to 5800rpm and was basically leaving with a clutch dump and the exhaust wasn't hitting anything. Most of my hangers have hose clamps around them though to trap everything in place.

Your car would definitely do wonders with a sticky tire (you know it, I know it, everyone knows it lol).

Last edited by tehzack; 08-17-2018 at 07:04 AM.
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Old 08-17-2018, 07:14 AM   #13  
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Probably 1.5 or less 60' with wrinkle walls. Very nice work, especially on a grenade, haha!
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