Would love to know how the TDX61 stacks up! I've been dreaming of a TDX61 on my FC for like 2 years now :lol:

Apologies. Dyno charts without rpm on the x axis make baby Jesus cry :)

Rough conversion based on my gear calc spreadsheet using my gear ratios (os giken close ratio box and 4.8 final drive) is 82 is approx 3200, 93 is 3600, 104 is 4200, 115 is 4600, 126 is 5000, 137 is 5500, 148 6200, 159 6800.

I have ridden in an EFR7670, and I have a GT3574R (everything done for earlier spool (.84 AR, long intake, velocity stack, V-mount, 3" open exhaust, tuned with slight retarded timing in spool area, little richer AFR in that area, etc), except small street port), similar to your 6266.

There is no comparison between the two. The EFR7670 is a superior turbo or EFR8374. The EFR turbo's spool so early that they are much easier to drive. you can peddle it, its also easier as the EFR7670 starts to lose a little power at redline, drops off a little, I actually like this as a driver as you aren't holding your steering wheel white knuckled as the car is making almost max power with other turbo's up there.


Since I am at higher altitudes I would choose the EFR7670 for what I like. the power hits soon and its easy to drive. great autoX turbo and you could track it if wanted. There is NO way a larger turbo is going to even hold a candle to the EFR7670 on the AutoX track. you can turn the corner and BAM power, torque, its all there, you can finesse it if needed. A larger turbo won't spool quick enough to do really anything. The larger turbo's IMO are a big waste as they aren't streetable, they are slow to boost unless very high in the rev range, and I am willing to bet that a 350WHP EFR7670 against a 500-600WHP larger turbo couldn't beat this turbo on the majority of smaller tracks or street or canyon roads out there because you can peddle around a corner in the middle of the rav range and the power is there. you can take a gear higher and smoothly get through a corner and BAM power when you roll back on.

Sorry, I have a crush on the EFR turbo's;) I wish I had one.


Danny Popp won the ultima challenge last year with high 550 or so WHP corvette going against much more WHP cars. He won because he has power in the lower rev range and its there BAM! The EFR7670 turbo is like this, it will make you faster, especially if you aren't a great driver.

Great results Blaise ! The 8374 is a better turbo than our TDX61(TDX62 has same wheel dimensions as 8374 fyi). High nickel content SS turbine housing, better turbine and bearing tech, not to mention built in bov, speed sensor port and ebc solenoid. 8374 really shines with the iwg in terms of simplicity. The journal bearing tdx series is a very good bang for buck for those who cannot afford a EFR.

What's the latest on running the IWGs hard?

thats a great post... people forget we dont race dyno-charts

Unless you're targetting boost levels above 2bar i think IWG is the way to go. the key is to use an appropriate WG actuator spring

:icon_tup::icon_tup:

any updates on the above?:nod:

We have out fitted a t4 iwg 9180 and building the engine...going to try near 40psi with shaft speed sensor.

sounds good. will be interesting to see how the 9180 spools as compared to the 8374.

A kind request if you can please do some 15psi/1bar runs on the 7670, 8374 and 9180... before you gents turn up the boost to insane levels :nod::icon_tup:

Problem there is those e85/race-fuel numbers won't correlate very well to pump gas numbers. I would be interested to see it, though.

We are doing a flex fuel tune too guys
Low and high boost on both pump and e85...

We have 2 9180 and 2 8374 projects coming up soon so well have more results to come
ill keep posting up for the people who care.

Exciting data to come! I'm already sold though, just have to find the time to swap out the 6266 for an EFR counterpart.

Wow cant wait....awesome news :nod:

Though its not an IWG, I posted a video of my footwork at the track which really does a good job demonstrating how nice the response of the 8374 is.

https://www.rx7club.com/racing-kills.../#post11914061

Hopefully this will be on the dyno somewhere soon... p.s.: Why are forum attachments coming in upside down?

Here you got Peter..

Looks really good! We are excited to see how it turns out of for you.

I have had several more people install and run the kit, but no one has dyno tuned it( just street tuned).

I have confirmed the kit clears the RHD cars also( for other people reading)..

I'll throw in my own little teaser. managed to get my car running and boosting with the EFR 8374.
This is just the rough map to get it on the road, now its time to start tuning. The surprising thing is that it holds peak boost at 6psi with the waste gate plumbed straight to boost pressure. I'll hopefully get to checking for boost leaks tomorrow but it didn't sound like there were any major leaks.

This is on a stock port engine with a recent rebuild(15K km's or so).

Any updates?

Found a big boost leak, did one small pull and it went up to 7psi before I let off. I have to solve some idle tuning issue before I get into street boost tuning, then I'll report back with the actual minimum boost possible and other details.

my 8374 holds about 9psi from my testing today with no control solenoid. when I set that up I'll probably set it to 10 so that the boost should stay nice and flat, I'll probably go up to 15psi or so and that's as high as I would want to go on my current setup.

this is stock port
3.5" downpipe and resonated midpipe
3" catback

shorty manifold that is pretty similar to turblown's but home made.
550 primaries 1680 secondaries
horrible temp intake setup
greddy front mount

This info is real cool, because my next engine build will have higher compression rotors and I want to run low boost for 91 octane. What compression are you running? You said stock ports?

the engine is from a stock 1992 jdm FD, I rebuilt it myself with the Atkins kit. I might look into porting the wastegate on the turbo a little as I still plan on freeing up the exhaust flow a little so it will creep a little higher.

here is a video of one of my pulls, this is with the wastegate attached straight to a boost source.
https://www.youtube.com/watch?v=XQJV...ature=youtu.be

Is everyone having success with retaining the air conditioning?

I believe it doesn't matter just like with any other single turbo. Your intercooler and rad setup is what interferes with the air conditioning and that is independent of the turbo choice.