Looking to upgrade from my JRSC... - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-13-2009, 09:32 PM   #1
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Default Looking to upgrade from my JRSC...

The car is a '95 R with Track Dog I/C, Miata Link ECU, FM Happy meal clutch kit, RC 550 High Imp injectors, AEM Wide band, Walbro 225 (I think) fuel pump, Koyo radiator, Raacing beat exhaust, I run NO PS, but want to put my A/C back on. Currently the JRSC has the boost up kit at @ 6psi after the I/C...I estimate a 1 psi drop. I basically want the car to be a canyon KILLER...I already give the bikes and most cars a run for their money. I also use the car for track days, so I am sure the same tune and build would work for both. I am thinking some where around 12-ish psi with a flat curve is where I want to be. I am not a high rev driver, like to short shift...but the JRSC lends itself to that, so I may have to retrain myself to let the r's go. Since I have the ECU, I/C, fuel pump and injectors I figure a DIY is my best route. So I am looking for suggestions for the rest of the needed bits...intake, turbo, fpr (if needed), exhaust, etc. I have had several turbo cars in the past Toyota Alltrac, 240s, etc.

Thanks in advance

Last edited by Lincoln Terns; 04-13-2009 at 10:10 PM.
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Old 04-13-2009, 10:28 PM   #2
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you have a lot of good go-fast parts for a turbo build. Those injectors, the WB, ECU, clutch, radiator, and possibly the intercooler will all go great with a turbo kit. The easy route would be to buy a turbo/manifold/downpipe package from either FM or BEGI ($1500). Once you do that, all you'd need to do is route your pipes, do a good tune, and you'd easily have 180-250hp, depending on which turbo you bought, how much PSI you'd run, and how good your tune is.

However, this is most definitely not the cheapest route. One option is a china charger from BEGI, which can be had with a manifold and downpipe for about $1000. Cheapest would be to make your own manifold and downpipe, with a used turbo off ebay. Some would argue that this is not worth the effort and possibility that it fails, including me.
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Old 04-14-2009, 05:22 PM   #3
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$1500 is in the budget for sure (with a little wiggle room for all the random **** you never factor in). I sold my shop equipment (TIGs, plasma, etc) so making intake and exhaust is a little more of a hassle for me right now.

What turbos would yous guys recommend for my desired use and power goals? I would certainly prefer to spend a little extra now to save either going bigger later OR having to repair a cheaper part.

Thanks
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Old 04-14-2009, 05:45 PM   #4
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You can do 12 psi with just about any turbo. In order to recommend a turbo for your goals, we need a specific horse power range OR need to know if the torque curve is the be all end all.
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Old 04-14-2009, 06:04 PM   #5
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Stephanie...250hp would be a nice number to hit, but I certainly want to keep a nice flat torque curve. As I mentioned earlier I am kind of a short shifter, so boost low works better for me. If I could mimic the curves of the JRSC but up them by 25-30% I would be shittin' in tall cotton.
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Old 04-14-2009, 07:05 PM   #6
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The only other piece of the pie is MONEY! How much of it do you have? Don't forget to account for the $1500 or so you'll get from selling off your entire SC build+exhaust.

You're a prime candidate for a BEGi S4 w/GT2560 and Enthuza 3"exhaust. I've done the cost comparison of all the parts on the kit... you can delete the IC that comes with it and just fab up (or have BEGi fab) a hot-side charge pipe to mate with your TD intercooler, and be really set. You can buy the major hardware of the S4 and save a little money doing your own water/oil lines, skip the airbox and scooper, and be way ahead.

You don't mentin anything about tires... if you intend to track 250whp, I hope your tire/wheel choice is appropriate and substantial.

And where exactly are you in SoCal?
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Old 04-14-2009, 07:22 PM   #7
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Grab yourself a gt2560, and hit up turbotim on this forum. Let him fab you up a downpipe/manifold (ala absurdflow), and then just head over to a local exhaust shop for a 3" exhaust/magnaflow muffler cheap as you can get it.

All your other stuff sounds legit, add a bov to the list

You should have no prob clearing 200whp with the responsiveness you want
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Old 04-14-2009, 07:59 PM   #8
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I pretty much got the wheel/tire thing hooked up...street tires are Azenis AT615 on Konig Heliums, track tires are Proxis RA1 on Team Dynamics both sets are 205/50/15. I want to stick with 15s but I am seeing a brake upgrade in my future...hope to make it clear the wheels I have.

I am off the 101 near Valley Circle.

Thanks for all the input so far. It has been years since I was last into turbos and the technology is leaps and bounds ahead now. Again, I appreciate the help.
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Old 04-15-2009, 06:32 PM   #9
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I wrecked my lower control arm being a "canyon killer". I would build your car for the track and track only.

As for track duty, I think you may want to run more timing retard in boost for extended track days.
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Old 04-15-2009, 07:32 PM   #10
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Quote:
Originally Posted by Chris_Himself View Post
I wrecked my lower control arm being a "canyon killer". I would build your car for the track and track only.

As for track duty, I think you may want to run more timing retard in boost for extended track days.
Thanks for your concern. Getting over zealous in the canyons can certainly cause havoc on your car...especially if you leave the driving surface.

I am sure (have not looked into it yet) that my ECU will adjust for that. It has full 3-D mapping for boost, fuel, timing...although I still have not looked at the turbo maps, only the SC ones.
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