Looking at the data from turblown...the 8374 def looks like the better midrange/high rpm turbo.....big plus point is the lower egt's and Spools almost as fast as the 7670.

lmao.....:lol::lol::lol::icon_tup:

Where are the EGT number comparisons. Missed those.

Very tempted by the 7670 IWG 0.92 as my car is 90% road, but with the potential of more track work the 8374 1.04 EWG does appeal too, despite the additional expense of the EWG setup.

How would the turbo work on a 20b roadrace car? My rules states 600rwhp as a maximum so this would be perfect, but how would the backpreassure be? External gate is a must ofc. ....why dont anyone sell 8374/9180 hybrids :-(

I do not think anyone has done that yet. 99% of the kits we sells are the 8374.

As soon as the engine is back together on our roadcourse car I am doing an entire dyno comparison days( back to back tests between 7670, 8374, 9180, iwg vs ewg, shortly vs long etc). I have all of the turbos, and manifolds finished sitting here ready for it.

Rotors are on their way back from balancing on the engine...

On a 20B I would just run a 9180( with the 3" vband inlet option we carry).

No reason to run a 8374 mated to a 90mm turbine wheel found in the 9180....

:drool: :icon_tup:

I would use a 9180 if the rules allowed me....do you think the 8374 is to small for 500-550 hp on a 20b? Will it choke to death by backpressure?

if you are restricted on compressor inducer to an EFR8374, my suggestion would be the 1.45 a/r. that is an outstanding combination. invest in a turbo shaft speed sensor.

agreed 100%. the fact is a larger turbine wheel :compressor wheel ratio will increase turbo shaft speed for a given boost level, not worth the tradeoff when you have the 1.45 a/r available

you and me both! EFR 8374 is *that* good. I pulled my 8374 off my evo, to try some other turbos.. but now I think its going back on.

Brilliant, look forward to that comparison :icon_tup::nod:

What could one expect with a similar setup but pump gas 91 with water/meth injection instead of e85?

Also, what's the reason behind the 1.5" runners on the manifold? Is the larger 2" just not needed? Just wondering.

Interested to see what results Turblown is able to achieve.

I will have a GTX4202 vs EFR9180 with 1.45 rear comparison coming soon.
Back to back on the same car.
Just sorting out some issues with the car so hopefully not long.

any updates?:):icon_tup:

yes, go look at the raceonly facebook page.

Awesome result! :)

Sorry should have been more specific....any updates/results on the above turbos being tested on the ported motor? :):icon_tup:

Wow, I was 100% on the 7670... but the 8374 is interesting. I'd like to know what's the power you can get from each on 91 octane, subscribing to this for dyno shootout! :)

I didn't tune this one, it was on a PFC in England(FD3S chassis)

7670 IWG @ 1.1 bar, pump gas, stock ports, stock ignition( 9s), 3" exhaust, vmount, bosch 044 etc..

Whoa, 400 whp on pump? Have you seen that with the 7670 in the states? On 91 octane?

I have made 440rwhp on the airwerks 7670 on pump only(22psi).

Am running the 8374 with 1.05 hot side fully divided short manifold and twin external gates on my mildly ported 13BREW. Is running E85 fuel. Was chasing area under the curve and response as opposed to peak number as it is a tarmac rally car. Car is running 20psi, is hitting that at approx 3200 rpm and making 442 ATW. Am very happy with the results. Great initial spool up and power, epic midrange and top end and great transient response on and off the throttle. Spool is just always there. The minute you breathe on the throttle its making boost.

I would have considered the IWG for simplicity but they were an unknown quantity as to whether the internal gate could cope with rotary flow when we were at that stage of the build so we erred on the side of caution with the ext gate setup.

Attachment 626347

Attachment 626348

great result Blaise, would love to see the back to back reference to the Tdx61 as well you had :)

Also what gearing are you running? Or did you stop at 6K rpm?

Unfortunately never actually ran the tdx61r. Made the manifold and everything but once I saw the reports of what the EFR was doing I gambled on it being the best way forward. Would definitely be interesting to see how the TDX61 stacks up though.

What is the rpm spread in this graph above? The torque curve looks excellent! All these efr threads are making want to ditch the 6266 :icon_tup:.