Single Turbo RX-7's Questions about all aspects of single turbo setups.

Which turbo is right for me (FD3S)!

Old 08-24-12, 11:01 AM
  #26  
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With the Pfc get the EV-14's. Many different people offer fuel systems, gona be around a grand. At least 2200cc secondaries. Go bigger on primaries if you like, but with a td61 its not needed. If you can afford it do the 1000/2200 like fenada monkey suggested, its just way over kill.

Pfc will work fine but again limits you if you want to get crazy with the power, ie adding additional injectors, the processing speed, and what not.

Vmount- Use the search function and find one that suits your needs.

Clutch- If you have the cash, get a twin disc but they too are about a grand, as far as band I don't think it matters much...

With the coil overs, pay attention to the spring rates. I have 12kg all around, Many seem to like 12 front 10 rear, the RE Amemiya touge battle car runs 16kg front and 18kg rear.
Its up to you...

The Banzi stuff braces the ppf and doesn't remove it.

Some of this gets out of the scope of the single turbo talk. Go to the suspension, brakes, cpu and other threads to cover these topics. You do realize all the stuff you are talking here is like easily like $12,000 to $15,000 and thats just to buy the parts. Good luck man.
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Old 04-04-16, 07:07 PM
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Maybe you should consider a set of oem fitment
Bathurst sp hitachi twin turbo , the new improved version just got release .

Improvement on original is they have Larger turbine wheels
( std turbine wheel 45mm , new improved is 51mm)

Rated at 650ps ( standard twins 400ps)

Very responsive , but more top end ,
(19psi at 2800 all the way to 8600rpm )
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Old 04-04-16, 07:22 PM
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you bump wrong 4 year old thread>
https://www.rx7club.com/new-member-r...pump98-936875/
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Old 04-04-16, 08:42 PM
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Originally Posted by lastphaseofthis View Post
This is the New improved Bathurst sp twin version , that's the old Bathurst sp twins .
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Old 04-05-16, 04:11 PM
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Efr 8374!!!
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Old 04-05-16, 08:06 PM
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8374!
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Old 04-05-16, 09:11 PM
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7670x2.. or 3
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Old 04-05-16, 09:20 PM
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trump!
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Old 04-06-16, 03:22 AM
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The 8374 is really nice but really expensive. You could always look into the S300SX-E 8376*it shares the same compressor as the efr, however it is a journal bearing and much less than 1/2 the price of the efr
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Old 04-06-16, 06:22 AM
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^^^ Also doesnt have the GammaTi turbine wheel, that's a big part of the incredible spool these turbos have since GammaTi is 40% lighter than inconel which is traditionally used in turbine wheels
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Old 04-06-16, 06:26 AM
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Anyone can bolt on oem fitment Bathurst sp twin, no need for any fabricating or
Modifications .
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Old 04-06-16, 06:30 AM
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And the premium u type intercooler kit with carbon ducting

Ultimate high powered street package .
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Old 04-06-16, 07:26 AM
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More info on upgraded Hitachi twins.

1-2 years ago Hitachi released an updated version of the HT12 turbos (the 280ps "99-spec" ones) called the HT12-3KAI. Apparently they can handle much more boost than standard twins reliably (between 15-20 psi) as they are made with stronger bearings, stronger shafts, have a larger wastegate and adjustable actuators.

They cost a pretty penny at about 2,100 before customs and VAT charges but are apparently the best twins around. They come with a 12 month warranty too although that sounds kinda short to me.

There are no modifications required to fit them either.

For those that know their turbos and compressor maps what do you think? I imagine the top end wouldn't be much different than standard twins but the low-to-mid range could be quite a lot beefier.












280ps HT12 turbos






HT12-3KAI




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Old 04-06-16, 08:49 AM
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Info is not 100% correct
They only can flow 15 psi at 7300rpm from standard ht12
15psi at 7000 rpm

They make 13kw from the wheel more than standard ht12 with is
Std ht12 240rwkw and high flow ht12 make 253kw.

The only reason they can only run 15psi up top end ,cause actuators are only
Standard ( no pre load opening at 0.45 bar ).

With pre load they open at 0.65 bar , like standard ht12.

Bathurst sp twins have the actuator made by hitachi special order with 0.85 bar opening with no pre load .
You can adjust the pre to 1bar .

This allows for the factory boost solinoide to run high boost with the Apexi Ecu .
Also the Bathurst sp version compressors covers are remanafactured like limited Bathurst sp version , they have larger A/R than the std ht12 3ka version , this allow for top end flow

The Bathurst sp turbine wheels are 51mm x 56mm,

Std new ht12 turbine wheel are 45mm x 50mm

Compressor wheels (43.2 mm x 57mm ht12 -3ka)

Bathurst sp compressor wheels( 47m x 68mm)

This allows Bathurst sp twin version to flow to 8600rpm at 19psi

Bathurst sp twin have a 360degree thurst bearing support plate , for high reliable boost .
Good for 350rwkw e85 or high octane unleaded ( eg vp fuel ms 100)
Or 300rwkw on pump 98 fuel

Last edited by THE DOCTOR; 04-06-16 at 05:38 PM.
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Old 04-06-16, 08:52 AM
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Thanks for the additional info. I pulled most of this information from various posts from Ric Shaw in Australia as I can't read Japanese so couldn't verify what was different on these twins.
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Old 04-06-16, 03:29 PM
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i dont get it, the fd left production in 2002.. why they make these new turbos? any dynos yet??
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Old 04-06-16, 04:33 PM
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same...so where does one actually buy these "new" turbos??
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Old 04-06-16, 04:43 PM
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The three places I know of for the Hitachi HT12-3KAI are:

Ric Shaw Racing - Australia

http://www.ricshawracing.com/

Under "Parts & Suppliers"

AUD 4,400

GCG Turbos - Australia

Mazda : Hitachi HT12-2KAI RX-7 FD3S Upgrade Turbochargers

AUD 4,500

GCG Turbos Japan

GCG TURBOS

JPY 330,000

PDF (page 33 but lots of cool graphs and info in this pdf) - http://www.gcgturbo.co.jp/uploads/pdf/gcg_0320.pdf


Psst...cheapest from GCG Japan directly (before shipping and customs of course).

Last edited by cib24; 04-06-16 at 04:46 PM.
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