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

HKS kit with the GTIII-4R Turbo

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Old Feb 14, 2026 | 04:36 AM
  #26  
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Arrogant Wankeler
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Unless you use the intended turbo the downpipe will not fit.

One is plumb back the other is vent to atmosphere.

Honestly, either use a conplete kit with the correct turbo or get stuff fabricated to suit what you want.
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Old Feb 14, 2026 | 05:11 AM
  #27  
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Originally Posted by Staubkappe
So the Greddy kit or manifold will fit to a SXE or EFR turbo while the HKS would need some modification?
I am also highly confused because those two kits look very different to me; why does the HKS kit have this splitted front pipe?

HKS special set up kit
HKS special set up kit


Greddy TD06 kit
Greddy TD06 kit
greddy manifold and Efr turbo do NOT fit together. I highly doubt the SXE fits because its similar in size to the EFR.

Also, instead of a TD06, i would get a T78 manifold.. but you still need to put a spacer to make it work. I had used a 20mm spacer to move it as further away from the intake manifold as possible. It didnt need to move that much but i dont have the exact number handy.. i have used the t78 manifold - EFR8374 on many setups and it is an economical approach with robust results. i was running that manifold with different turbos including the 8374 for over a decade
Bare in mind, the T78 (and the TD06) manifolds have smaller runners.
While it will be very responsive, your EGTs will run high and it will choke on top if you boost it high (25+ psi)

On a different setup i have put together with a T78 manifold, the EFR 7670 fit without any problems

Last edited by R-R-Rx7; Feb 14, 2026 at 07:08 AM.
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Old Feb 14, 2026 | 07:17 AM
  #28  
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Originally Posted by R-R-Rx7
greddy manifold and Efr turbo do NOT fit together. I highly doubt the SXE fits because its similar in size to the EFR.

Also, instead of a TD06, i would get a T78 manifold.. but you still need to put a spacer to make it work. I had used a 20mm spacer to move it as further away from the intake manifold as possible. It didnt need to move that much but i dont have the exact number handy.. i have used the t78 manifold - EFR8374 on many setups and it is an economical approach with robust results. i was running that manifold with different turbos including the 8374 for over a decade
Bare in mind, the T78 (and the TD06) manifolds have smaller runners.
While it will be very responsive, your EGTs will run high and it will choke on top if you boost it high (25+ psi)
Thank you for the clarification, maybe i misread what FDAUTO meant and mixed up the replies. 25 PSI is more than i am aiming at; I want to be at reliable 400 hp with good response when everything is done, so i guess that should be around 18 PSI (?). I am new to this and i never converted an NA or TT engine to single turbo so i try to do as much research as possible. Would suck to wait 3 months for parts just to wait another 3 months because something didn't fit but i would like to avoid spending that much on taxes/tolls when buying the turblown kit.
What ECU are you using? Is the Power FC fine for this or would you recommend opting for something like haltech?
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Old Feb 14, 2026 | 07:28 AM
  #29  
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From: Limassol, CYPRUS
Originally Posted by Staubkappe
Thank you for the clarification, maybe i misread what FDAUTO meant and mixed up the replies. 25 PSI is more than i am aiming at; I want to be at reliable 400 hp with good response when everything is done, so i guess that should be around 18 PSI (?). I am new to this and i never converted an NA or TT engine to single turbo so i try to do as much research as possible. Would suck to wait 3 months for parts just to wait another 3 months because something didn't fit but i would like to avoid spending that much on taxes/tolls when buying the turblown kit.
What ECU are you using? Is the Power FC fine for this or would you recommend opting for something like haltech?
I was using the power FC with the 8374 at 30psi for many years with no problems. I have changed that setup since, i have been running a haltech elite 2500 and i really like it but the key ingredient is the tune. tune it right and everything will be fine for many years whether it is a power fc or a haltech or a motec ecu.
it all depends on your budget

For 400whp i would personally stick a 7670 and it fits with the t78 manifold just fine. you can find that manifold reasonably priced.
when they pop up on the yahoo auctions, they go for a few hundred dollars. Robust manifold, with steel flanges (as opposed to stainless steel) so there shouldnt be any deformation on the flange due to heat.
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Old Feb 14, 2026 | 07:53 AM
  #30  
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Originally Posted by R-R-Rx7
I was using the power FC with the 8374 at 30psi for many years with no problems. I have changed that setup since, i have been running a haltech elite 2500 and i really like it but the key ingredient is the tune. tune it right and everything will be fine for many years whether it is a power fc or a haltech or a motec ecu.
it all depends on your budget

For 400whp i would personally stick a 7670 and it fits with the t78 manifold just fine. you can find that manifold reasonably priced.
when they pop up on the yahoo auctions, they go for a few hundred dollars. Robust manifold, with steel flanges (as opposed to stainless steel) so there shouldnt be any deformation on the flange due to heat.
Thank you, sounds like a plan. Are you using an IWG? I am currently unsure what is the way to go since EWG sounds safer and more capable. I am not afraid by the 600/700€ it costs extra to go EWG but i am not allowed to dump into atmosphere, so i would have find someone to weld the exhaust manifold so i can reroute the EWGs into the exhaust.
Is this what the HKS set plans for with the red circled thing?

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Old Feb 14, 2026 | 08:14 AM
  #31  
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From: Limassol, CYPRUS
You will need a complete custom downpipe. You can re-route the wastegate into the downpipe like what you have circled. . With the greddy or HKS manifolds you have to run EWG unless you somehow modify them to make it work. Too much work if you are asking me.

i have always used EWG . The IWG is appealing because of the simplicity but i have yet to see an IWG without boost creep. I am not too experienced with the IWG so I dont want to repeat someone else’s experience since its not my own.


i know Germany is really strict with the TUV inspections so whatever you do make sure you wont get in trouble with the local authorities
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Old Feb 14, 2026 | 08:56 AM
  #32  
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From: Germany
Originally Posted by R-R-Rx7
You will need a complete custom downpipe. You can re-route the wastegate into the downpipe like what you have circled. . With the greddy or HKS manifolds you have to run EWG unless you somehow modify them to make it work. Too much work if you are asking me.

i have always used EWG . The IWG is appealing because of the simplicity but i have yet to see an IWG without boost creep. I am not too experienced with the IWG so I dont want to repeat someone else’s experience since its not my own.


i know Germany is really strict with the TUV inspections so whatever you do make sure you wont get in trouble with the local authorities
Yeah that's what i am afraid of.... then i guess i will go IWG with an EFR 8370 or something among that lines. Getting a proper TUV approval for the turbo kit alone is around 2.800€, wastegates and bov definietly will cost extra in this regard as well.
Cyprus felt a bit more laid back when it comes to TUV inspections lol, i was in paphos just last november
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Old Feb 14, 2026 | 09:34 AM
  #33  
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From: Limassol, CYPRUS
Originally Posted by Staubkappe
Yeah that's what i am afraid of.... then i guess i will go IWG with an EFR 8370 or something among that lines. Getting a proper TUV approval for the turbo kit alone is around 2.800€, wastegates and bov definietly will cost extra in this regard as well.
Cyprus felt a bit more laid back when it comes to TUV inspections lol, i was in paphos just last november

it was very laid back, now not so much but i am sure its still much more laid back than Germany… but it really depends who you know
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Old May 12, 2026 | 08:41 PM
  #34  
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Hey, any updates on this and refreshed thoughts?
Did you manage to get some dyno graphs from this car?

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Old May 12, 2026 | 09:56 PM
  #35  
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Originally Posted by dp-ped
Hey, any updates on this and refreshed thoughts?
Did you manage to get some dyno graphs from this car?
I have ordered the kit and some other parts, I ordered the kit itself then a separate GTIII-4R with A/R 1.00 WG instead, they also have their new GT turbos coming out in the same housing so that should be interchangeable to use in the future.

Kit is ready to ship but waiting on some of the other parts that are being manufactured - Intercooler, Radiator, Heat shield and Intake.

Hopefully will have delivery in the coming months and a Dyno by end of the year depending on how I go putting it all together.

Once done ill definitely post the results even if they aren't anything special its good to have the information available.
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Old May 12, 2026 | 11:19 PM
  #36  
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A little late to respond but for clarification, both variants of the greddy manifold DOES in fact work with an s300 sxe, sxr AND the regular airworks compressor housing..... the ugly one. I have not fit an efr on it but the 8374 looks to be physically smaller than the s300 frame and it's variants so I suspect it will fit just fine. I can verify in about a month or so.

No spacer, no mods to manifold, no mods to the turbo, stock lower intake manifold. They just bolt together and everything clears.
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Old May 13, 2026 | 09:50 AM
  #37  
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The car I mentioned earlier went home making ~20 (I think?) psi on e85 with too many small things going wrong to really continue, not the least of which was a wicked rear main seal leak. Since I wasn't the engine builder nor installer (too many cooks in the kitchen) I opted to have the owner take that up with the two of them. I think final numbers were in 478 range to the wheels - later today I'll post something up.
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Old May 13, 2026 | 10:55 AM
  #38  
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From: Limassol, CYPRUS
Originally Posted by FDAUTO
A little late to respond but for clarification, both variants of the greddy manifold DOES in fact work with an s300 sxe, sxr AND the regular airworks compressor housing..... the ugly one. I have not fit an efr on it but the 8374 looks to be physically smaller than the s300 frame and it's variants so I suspect it will fit just fine. I can verify in about a month or so.

No spacer, no mods to manifold, no mods to the turbo, stock lower intake manifold. They just bolt together and everything clears.
i have done it. It doesnt fit with the EFR8374 . The 7670 fits and its borderline
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