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

EFR 8474's and 9274's

Old 11-05-18, 11:56 AM
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EFR 8474's and 9274's

Saw them at SEMA and talked to the reps a bit about them.

The compressor map looked very different (flow more at lower pressures), even though both the comp and turbine wheels are the same physical sizes, they have a very different characteristics.

The key take-away is that they are less diesel focused (e.g. 50 PSI) and more oriented for the street/gas performance applications.

@Turblown, any info on availability and more details?
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Old 11-05-18, 02:01 PM
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Saw something about them also available on the SXE platform, and that the compressors were a dark color?
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Old 11-05-18, 07:57 PM
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I'll be doing a write-up for them later this week for Full-Race.com.

Essentially the compressor ratio itself from Inducer and Exducer are dramatically changed, but they are still B2 Frame Turbochargers.

9280 vs. 9180 = Same 91mm Exducer, but 9280 has 74mm Inducer and 9180 has 68mm Inducer.
9274 vs. 9174 = Same 91mm Exducer, but 9274 has 74mm Inducer and 9174 has 68mm Inducer.
8474 vs. 8374 = Same 84mm Exducer, but 8474 has 68mm Inducer and 8374 has 62mm Inducer.

I can get more into details later, but that's the gist of it. The effects, we'll wait and see.
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Old 11-06-18, 01:07 AM
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More shaft speed required (before approaching choke flow) for the same boost but significantly more flow. Should be slightly less responsive but allow more power on the same frame size for the boost levels most people are running on street/track/standing half/mile events.

Be interesting to see 9280 vs sxe369 & sxe372 for the guys who wanted a touch more than the efrs could provide previously. Still a big price difference.

Last edited by Slides; 11-06-18 at 09:24 PM. Reason: Clarification
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Old 11-06-18, 04:24 PM
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Originally Posted by Slides View Post
More shaft speed required for the same boost but significantly more flow. Should be slightly less responsive but allow more power on the same frame size for the boost levels most people are running on street/track/standling half/mile events.

Be interesting to see 9280 vs sxe369 & sxe372 for the guys who wanted a touch more than the efrs could provide previously. Still a big price difference.
That is my best guess too based on the wheel sizing. I haven't seen any maps yet, I've been waiting on them.

BW takes a long time usually to put stuff on the shelves, so I wouldn't hold your breathe for any real world results anytime soon..


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Old 11-06-18, 05:08 PM
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I haven't seen the compressor maps, but typically the larger inducer on the new EFR 8474 would fix the compressor surge issues the EFR 8374 has from spooling so hard in the 3,000 to 3,5000rpm range and above 15psi.
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Old 11-06-18, 07:35 PM
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what are the symptoms of the compressor going past the surge line?
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Old 11-06-18, 08:07 PM
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The car/drivetrain shakes as the engine shutters and makes a chh-chh-chh-chh sound and the boost needle bounces.
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Old 11-06-18, 08:48 PM
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Originally Posted by BLUE TII View Post
The car/drivetrain shakes as the engine shutters and makes a chh-chh-chh-chh sound and the boost needle bounces.
Which is more of an issue on a stock, or stockish port car that is running 20+ psi by 3-3400rpm range.

I just ran a street-ported 8374 on the dyno a couple days ago with zero surge( OEM medium actuator, 3" exhaust, E85, seeing 20 psi by 3400rpms).
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Old 11-06-18, 09:17 PM
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I have all of the compressor maps... They're in my brochure right here in front of me. I guess I could snag a few pictures for y'all.
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Old 11-06-18, 09:19 PM
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Yup, anything you can do that improves overall engine flow (porting, less restrictive intake/IC, add a rotor) will move the engine operation Right on the compressor map away from the turbo surge line.

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Old 11-07-18, 08:00 PM
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instead of using 8474 or 9274 which i imagine would increase lag, wouldn't it accomplish the same thing by using one of the similarly sized SXE turbo? those have abit more lag but have a wider compressor map area interms of the surgeline.


My 2nd question for the experienced tuner, if let's say you went with a EFR8374, and you experienced surge at low rpm, would you be able to tune the boost control to remedy that?
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Old 11-07-18, 09:15 PM
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^^
Yes, if you have any form of electronic boost control (a solenoid) in your turbo system you can easily tune around the surge prone area.
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Old 11-07-18, 09:17 PM
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I predict the EFR 8474 will just simply be the new hot **** for the 2 rotor in the 400-550rwhp range.
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Old 11-08-18, 01:00 AM
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D: Shows what I know.

Larger inducer with same size exducer on the compressor actually makes the turbo more prone to surge...
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Old 11-08-18, 01:20 AM
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EFR 8474 compressor map in Red overlaid on 8374 compressor map in Black


EFR 9274/9280 compressor map in Black overlaid on 9174/9180 compressor map in Red



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Old 11-08-18, 03:34 AM
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If they give this treatment to the 7670 I'll be very interested
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Old 11-08-18, 02:46 PM
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Full catalog download FYI;

file:///C:/Users/turbl/Downloads/bwts_performanceturbosgeneral_1920_2169.pdf

Very happy to see they kept the same turbine wheel sizes, as all of these will fit our new turbine housings..

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Old 11-08-18, 03:32 PM
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Originally Posted by Turblown View Post
Full catalog download FYI;

file:///C:/Users/turbl/Downloads/bwts_performanceturbosgeneral_1920_2169.pdf

Very happy to see they kept the same turbine wheel sizes, as all of these will fit our new turbine housings..

You pointed to a local file FYI.
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Old 11-08-18, 04:03 PM
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Turblown

Very happy to see they kept the same turbine wheel sizes, as all of these will fit our new turbine housings..
Tease!

Whats the deal? Did you integrate exhaust manifold and turbo exhaust housing into one unit for rotary?
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Old 11-08-18, 04:33 PM
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Originally Posted by BLUE TII View Post
Tease!

Whats the deal? Did you integrate exhaust manifold and turbo exhaust housing into one unit for rotary?
Variable a/r


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Old 11-08-18, 04:48 PM
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Ah, that should lead to some compressor surge on the EFRs if people don't get the switchover point low enough

Nice work! That will be nuts on the rotaries.

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Old 11-08-18, 05:42 PM
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Originally Posted by BLUE TII View Post
Ah, that should lead to some compressor surge on the EFRs if people don't get the switchover point low enough

Nice work! That will be nuts on the rotaries.
It definitely requires tuning, which is why we also cast EMAP bungs into the turbine housing, and recommend using the shaft speed sensors.

We've also changed the turbine discharge to be interlocking, so people can use the Tial downpipe flanges. We've made other additional changes like removing excess material, and smoothing out areas inside etc.

Seeing as these new EFRs will be laggier, this should help compensate.
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Old 11-09-18, 06:27 AM
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I think bigger the inducer to exducer ratio then more that it flows at the lower pressures. The idea is that these will make a lot more power in the 15-25psi range where most people run these.

Originally Posted by RGHTBrainDesign View Post
I'll be doing a write-up for them later this week for Full-Race.com.

Essentially the compressor ratio itself from Inducer and Exducer are dramatically changed, but they are still B2 Frame Turbochargers.

9280 vs. 9180 = Same 91mm Exducer, but 9280 has 74mm Inducer and 9180 has 68mm Inducer.
9274 vs. 9174 = Same 91mm Exducer, but 9274 has 74mm Inducer and 9174 has 68mm Inducer.
8474 vs. 8374 = Same 84mm Exducer, but 8474 has 68mm Inducer and 8374 has 62mm Inducer.

I can get more into details later, but that's the gist of it. The effects, we'll wait and see.
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Old 11-09-18, 06:33 AM
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@Turblown, cool innovations as always.. These may not necessarily be much "laggier", since they will be delivering more air at lower pressures, but rather a more linear power delivery which is what we can hope for. Thanks for pitching in!

Originally Posted by Turblown View Post
It definitely requires tuning, which is why we also cast EMAP bungs into the turbine housing, and recommend using the shaft speed sensors.

We've also changed the turbine discharge to be interlocking, so people can use the Tial downpipe flanges. We've made other additional changes like removing excess material, and smoothing out areas inside etc.

Seeing as these new EFRs will be laggier, this should help compensate.
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