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

bw efr really worth it?

Old 04-11-15, 06:22 PM
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bw efr really worth it?

Im looking at building a street and occassional strip car. Looking at all these posts on the newer turbos im not sure where to go. My goal of 550whp seems attainable with so many different options. The s366 looks like it would work and is about 1/3rs the cost of the 8374. Any opinions are appreciated.
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Old 04-11-15, 06:58 PM
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if spool and response matters 8374 FTW.

if you can live with the lag of the s366.... then go for it.

IMHO you get what you pay for. Id personally go 8374.
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Old 04-11-15, 07:12 PM
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I know the spool is insane, but ive seen billet s366 spool quick too. Granted not as quick as the efr but it s $850 turbo vs $2200
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Old 04-11-15, 07:39 PM
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Originally Posted by teamafx View Post
I know the spool is insane, but ive seen billet s366 spool quick too. Granted not as quick as the efr but it s $850 turbo vs $2200

The benefit and cost comes with a standard milled billet compressor wheel and the Gamma Ti turbine wheel and shaft. You already have a wastegate etc.


Just to upgrade the s366 to a billet compressor wheel is an added $300. Not having to have a manifold to add wastegates etc. In the end you are not getting away with an $850 dollar uprgrade with an s366 anyway.

Last edited by chibikougan; 04-11-15 at 07:48 PM.
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Old 04-11-15, 07:54 PM
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I guess what I am getting at is with Turbo and all peripherals needed to run either Turbo with just a small search you are going to be quite close in price point yet quite far apart as far as overall performance.


Edit: There is also longevity to think about with the s366 you are going to have many peripherals and what is their longevity and increments of change of those items between turbos.

Last edited by chibikougan; 04-11-15 at 08:04 PM.
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Old 04-11-15, 08:07 PM
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Originally Posted by teamafx View Post
I know the spool is insane, but ive seen billet s366 spool quick too. Granted not as quick as the efr but it s $850 turbo vs $2200
It's all subjective and depends on your budget.
EFR is in a whole different league....s366 billet will be laggy and peaky....but still fun to drive. Just depends on your budget.
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Old 04-11-15, 08:09 PM
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Originally Posted by rx7srbad View Post
It's all subjective and depends on your budget.
EFR is in a whole different league....s366 billet will be laggy and peaky....but still fun to drive. Just depends on your budget.
Also highly dependent on the peripherals to run each turbo. Not just a matter of buying a turbo.


Edit: to the OP price the EFR you would want and Price the s366 you would want. Then put together a list of all peripherals needed. Price them together and you will have a much clearer picture as to what your real world costs will be not just a price of a Turbo.

Last edited by chibikougan; 04-11-15 at 08:15 PM.
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Old 04-11-15, 09:14 PM
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this^^

the efr comes with a bov and an IWG if you go that route. plus the manifold is cheaper. so overall the price difference isnt that dramatic.

By the time your done with the whole swap and everything needed i.e. ic, ecu, ignition, fuel, youre either at 10,500 or 11,000. Haha i think you get the idea.
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Old 04-11-15, 09:19 PM
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Also, you have to decide what you want. There is a member on here who tracks his car and mentioned the efr might spool a little too fast. His old td61 setup was more composed on the track. Thats really saying something. However, im sure with more seat time, a little tuning perhaps, the efr will outperform the td61 in most everyway.
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Old 04-11-15, 11:27 PM
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Just look at the multiple 8374 dyno charts on a 2 rotor. No other turbo provides apower band even close to it, period. Stop looking at peak power.
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Old 04-11-15, 11:56 PM
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Oh hell yes an EFR 8374/9180 is going to be worth the price premium.

I went from plain bearing T04B 60-1 to EFR 7670 and only gained 30hp peak with a whole bunch more boost, but the EFR on a rotary is in a whole 'nother realm in everything except peak numbers.

It reminded me of when I went from NA RX-7 to stock TII and I thought "this isn't any faster" and then looked at speedometer. That early torque makes it much faster in the real world and much easier to drive.
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Old 04-12-15, 07:50 AM
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I know the cost associated with everything. Ive owned 17 fds now. My last one I kept was a twin turbo t04e bb setup. Im looking at my options and was looking for opinions on people who currently own of have been in efr vehicles vs the s366 billet. Ive never been a peak power guy but I know after 15 years of owning these cars what I want to do just dont know if its worth the extra money to me.
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Old 04-12-15, 08:35 AM
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Originally Posted by silverTRD View Post
this^^

the efr comes with a bov and an IWG if you go that route. plus the manifold is cheaper. so overall the price difference isnt that dramatic.

By the time your done with the whole swap and everything needed i.e. ic, ecu, ignition, fuel, youre either at 10,500 or 11,000. Haha i think you get the idea.

Also add that you won't need a Electronic Boost Control..... My PFC controls two levels of boost.
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Old 04-12-15, 09:05 AM
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Originally Posted by teamafx View Post
I know the cost associated with everything. Ive owned 17 fds now. My last one I kept was a twin turbo t04e bb setup. Im looking at my options and was looking for opinions on people who currently own of have been in efr vehicles vs the s366 billet. Ive never been a peak power guy but I know after 15 years of owning these cars what I want to do just dont know if its worth the extra money to me.
I guess you already know everything then.


Or. If you had READ the responses fully before getting defensive on some made up slight, you would see they were not trying to inform you of the costs of everything else. Instead, they were saying that comparing just the price of the physical turbo is not a very good indicator or performance versus cost.

But after 17 FDs.... lulz
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Old 04-12-15, 10:05 AM
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We setup about 7 to 10 single turbo FDs a month, and have been for 10 plus years. I have done pretty much every combo you cab imagine. Our efr iwg kit is in an entire different league. Every single soul who has experienced one has been blown away.
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Old 04-12-15, 12:42 PM
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Originally Posted by Turblown View Post
We setup about 7 to 10 single turbo FDs a month, and have been for 10 plus years. I have done pretty much every combo you cab imagine. Our efr iwg kit is in an entire different league. Every single soul who has experienced one has been blown away.

Thats a good response. Thank you
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Old 04-12-15, 12:47 PM
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Originally Posted by Monkman33 View Post
I guess you already know everything then.


Or. If you had READ the responses fully before getting defensive on some made up slight, you would see they were not trying to inform you of the costs of everything else. Instead, they were saying that comparing just the price of the physical turbo is not a very good indicator or performance versus cost.

But after 17 FDs.... lulz
Wasnt defensive and your adding nothing to the conversation except making assumptions about what I meant and how I meant it. im fairly certain that I dont know everything otherwise I wouldnt have asked a question. I do no know what I want and for my needs and what I was asking was about performance of the turbo to warrant the cost difference not that the turbo comes as an all in one. I was strictly asking PERFORMANCE. but thanks for your input
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Old 04-12-15, 03:10 PM
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Originally Posted by teamafx View Post
Thats a good response. Thank you
Originally Posted by teamafx View Post
Wasnt defensive and your adding nothing to the conversation except making assumptions about what I meant and how I meant it. im fairly certain that I dont know everything otherwise I wouldnt have asked a question. I do no know what I want and for my needs and what I was asking was about performance of the turbo to warrant the cost difference not that the turbo comes as an all in one. I was strictly asking PERFORMANCE. but thanks for your input

Can I remind you that these threads are read by a community and we all need to keep that in mind. They are not just for you. Also you are being quite defensive and offensive you proved it by stating it


Have a great day!
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Old 04-12-15, 05:07 PM
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YES. The EFR's are worth it.

I have tested just about every single turbo in that medium frame size.

T04z
6766
6466
GTX42494
GTX4202
EFR9180

And i am not far from testing the EFR8374.

So far the EFR has been the turbo i have used.( I have used the 9180 on around 8 cars now in the past 6 months)

I will soon have dyno sheets for a back to back with a car going from the GTX4202r to a EFR9180 with 1.45 rear.
On the road I can already tell you which one spools faster, and its not a small difference. Im talking nearly 1000rpm if not more. 4202 would struggle to build 16psi in first gear let alone 2nd and the EFR is building 35psi in first gear. Let's see what they dyno sheet looks like.
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Old 04-12-15, 05:18 PM
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I appreciate everyones response. I was asking a question and then im accused of being defensive and offensive. This isnt the case. You cant defect tone on a forum or the way something is being said. I apologize for posting.....
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Old 04-12-15, 06:30 PM
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Originally Posted by teamafx View Post
I appreciate everyones response. I was asking a question and then im accused of being defensive and offensive. This isnt the case. You cant defect tone on a forum or the way something is being said. I apologize for posting.....
Proofs in the puddin and it is knee deep here.

You are very welcome and good luck!
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Old 04-12-15, 06:42 PM
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Originally Posted by teamafx View Post
You cant defect tone on a forum or the way something is being said. I apologize for posting.....
No need to apologize for someone else mis-interpreting your tone or attitude.

Seems like lately all across the board, club members are real quick to assume the worst about someone's attitude or tone.

And no, I'm not referring to anyone in particular, or attacking anyone, or being offensive or defensive.
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Old 04-12-15, 06:48 PM
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Old 04-13-15, 12:22 PM
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Op, if you want boost right now, then efr is the way to go based on some of the dyno charts I've seen. Power under the curve is how races are won. They damn near make the factory twins obsolete.

Last edited by t-von; 04-13-15 at 12:25 PM.
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Old 04-13-15, 08:15 PM
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turbo choice is usually a polarizing discussion on any forum... admittedly im pretty biased but I agree with most of the comments here

Originally Posted by teamafx View Post
Ive seen billet s366 spool quick too. Granted not as quick as the efr but it s $850 turbo vs $2200
Originally Posted by teamafx View Post
Ive owned 17 fds now. .. Im looking at my options and was looking for opinions on people who currently own of have been in efr vehicles vs the s366 billet. Ive never been a peak power guy but I know after 15 years of owning these cars what I want to do just dont know if its worth the extra money to me.
the s366 is a good turbo. They are affordable inconel wheel journal bearing turbos, easy to rebuild and get parts for. Response is good for a turbo of this size and power is also good. However the EFR is a completely different animal. I believe they are the most durable and reliable turbos available, from anybody.. the turbine wheel in the 8374 is literally less than half the mass of the s366 turbine wheel, that is h-u-g-e. The EFR can not be rebuilt by an end user and truthfully you should not ever need to -

Originally Posted by silverTRD View Post
the efr comes with a bov and an IWG if you go that route. plus the manifold is cheaper. so overall the price difference isnt that dramatic.
that is probably the most overlooked aspect of these turbos when comparing prices. the ability to ditch 2 wastegates/dumptubes/vbands/clamps/flanges/manifold ports/BOV etc is usually at least 1500$ savings. Plus less "stuff" and complexity is a benefit for most applications. For ultra-high power setups or full on race builds, external WG and large A/R has its advantages. However - I have not seen any advantages from a larger BOV compared to the oem EFR valve


Originally Posted by silverTRD View Post
a member on here who tracks his car and mentioned the efr might spool a little too fast. His old td61 setup was more composed on the track. Thats really saying something. However, im sure with more seat time, a little tuning perhaps, the efr will outperform the td61 in most everyway.
i can see how a twinscroll 7670 on a 13B might "spool a little too fast" -- thats why the 8374 has had such resounding feedback. I just got an email from a 13B customer in Brazil who owns a company "fueltech" made my day: "Hello Geoff, Im finally are able to say that the Borg EFR is so far the best turbo I ever used on my car! After many many turbos, I have my Mazda RX7 running with the EFR8374 and Full Race exhaust manifold, its amazing!! Thank you"


Originally Posted by rx7srbad View Post
It's all subjective and depends on your budget. EFR is in a whole different league....s366 billet will be laggy and peaky....but still fun to drive. Just depends on your budget.
Originally Posted by rx7srbad View Post
if spool and response matters 8374 FTW. if you can live with the lag of the s366.... then go for it. IMHO you get what you pay for. Id personally go 8374.
Originally Posted by chibikougan View Post
I guess what I am getting at is with Turbo and all peripherals needed to run either Turbo with just a small search you are going to be quite close in price point yet quite far apart as far as overall performance. Edit: There is also longevity to think about with the s366 you are going to have many peripherals and what is their longevity and increments of change of those items between turbos.
Originally Posted by BLUE TII View Post
Oh hell yes an EFR 8374/9180 is going to be worth the price premium.
Originally Posted by t-von View Post
Op, if you want boost right now, then efr is the way to go based on some of the dyno charts I've seen. Power under the curve is how races are won. They damn near make the factory twins obsolete.
agree 100%, you guys make great points.
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