EFR8474
https://www.full-race.com/store/borg...o-12747100019/
EFR9274
https://www.full-race.com/store/borg...o-12747100023/
EFR9280
https://www.full-race.com/store/borg...o-12807100005/

 

Depending on how spool is affected, that efr8474 looks very tempting. R/Ternie posted some results on his FB and he said the spool was minimally effected but I'm interested in other's experiences when it hits the dyno.

 

Posted a dyno comparison or just said something about it? He blocked me on FB so I cant see it...lol. If he posted a dyno comparison save the pic and post it here.

 

He didn't post an overlay, but definitely a plot - it looked no worse at all than the old EFR8374 but made >800whp.

 

Interesting that they gave up the efficiency in the center of the island on all of them to stretch the efficiency threshold as far right as possible. I guess they know their client base, and have options for two different types of competition.

 

Could you please ask him to share the dyno plot here too. I am probably not the only one here without a facebook account

 

Full Race has comp map overlays on their site. To me it looks like they really just stretched the map to the right, but didn't give up too much on the left side.

 

Someone snagged the dyno plot for us.

This is R/TErnies car. IIRC it's a 4g64 based 2.2L with Mivec and with his own custom T4 twinscroll turbo kit.

 

 

The above is the EFR8474, and it's running the 1.05 housing which was on the EFR8374 it replaced.

Here is the EFR8374 result "all in" - everything else the same.

 

So the 8474 spooled faster too.. that is awesome.

 

As usual, these dyno tests far apart are not representative of back to back testing, apples to apples.

According to Borg Warner, and Full Race, 8474 "should" spool about 200rpm later than 8374.
Faster not, but hopefully not too much later.

I attended a leisurely dyno-tuning session of an 8374 on 2.3 pump 91 California fuel and E85. Owner/tuner is not interested in pushing limits.
The 8374 spooled to 27psi in 3rd gear by about 4200-4300rpm on pump fuel.
In 4th gear it achieved 27+psi by 4000rpm.
On E85 in 5th gear 8374 was able to make 20psi by 3400rpm.

The tuning is continuing, using 4 port boost solenoid for example, and larger injectors.

Back to 8474, its a great answer for the 9174 crowd for sure.
But if it indeed spools 200rpm later than 8374, that will put it outside the taste-limits of those like me who like a super driveable car on street and are more backroad and track oriented drivers. 8374 is truly impressive, has made on Mustang Dyno on 91 California fuel about 475whp safely - 0 knock.
On E85 it can go to 625-635whp on Mustang, which reads 15% lower than Dynojet, proven.

 

Maybe we'll eventually see more results, but sometimes turbo's yield results that engineers don't expect.

For example, the English Racing Drag X with a Gen2 Precision 6785 has an identical torque curve to a 5858 car, until it massively exceeds the 5858 past 4800rpm or so.

 

If the temperature and air density numbers on the screen are correct, the 8474 was dynoed on a much colder day. The AIRDENS number differs by about 12% between the two charts. If those numbers are true, that could account for some of the differences.

Regardless, the 8474 is performing extremely well given the size. If R/TErnie says it's faster without giving much up to the 8374, I believe it.

 

IIRC he uses the dyno at APR where he works, given the reputation of APR I'm sure all the data on the screen is accurate.