Hey Guys,

Tariq here from RG Racing. Figured this would be an interesting comparison between these turbochargers on the EVO X.


Solid line:
EVO X GSR
BW EFR 7670 T4 w/internal wastegate gate 0.91 a/r
Full race T4 divided header for EFR turbo
Custom downpipe build by Racing Greed
Custom 3.5" intake built by Racing Greed
Injector Dynamics 1000cc injectors
Cobb Access port tuned by Racing Greed
3" catback exhaust

Dotted Line:
EVO X MR
FP BLACK Ball Bearing Turbocharger (bolt on Evo X)
Full race prostock EVO X twin scroll turbo manifold
ATP EVO X Downpipe
AEM Intake
Injector dynamics 1000cc injectors
Open Port ECU tuned by Racing Greed
3" catback exhaust

Enjoy!

 

what are you boosting the black to? less than 340hp with a black?

 

Not a good comparison between two different cars, let alone the GSR and MR.

I'd love to see a same car comparison on the same dyno with both setups being maximized because the black is far from it on this setup.

 

The black is spiking at 23 psi then tapering down to 20 psi. Yeah 340whp is the most we can get before it wanted to knock...

 

Yeah it would have been nice to compare a gsr to a gsr. As far is dyno & tuner, they're both the same on the comparisons.

We're installing cams on the one with the EFR 7670. Should be exciting!

 

What fuel is this on?

 

If one is octane limited then I am assuming it was not on a high octane fuel? I'd like to think both cars are on the same fuel as well.... if that EFR7670 is on 91-93 then that is impressive.

 

A black on 93 should make tons more than 340... 340 is stock turbo numbers.

 

Hi: Tariq thanks for all you guy's help with the build. The car is a dream to drive
Its like driving two different cars, in a really good way.
It is very tractable/drivable at low rpm (below ~4000 ) in traffic, standing start, up hills, but never feels weak or anemic. the feel is similar to the stock turbo but without the frantic rush when the stock turbo hits. We have moved to red line up to over 8k so it doesnt run out of power like the stock but just keeps spooling and when you link up a couple of redline shifts its frighteningly quick, it just keeps pulling, and pulling....

Both cars were on crappy canadian 94 octane pump gas (the 92 octane from across the line in the states is better in the testing RG recently did) on the same dyno at the same shop

we are installing a set of gsc s2 cams and beehive springs, but we are stalled waiting for new buckets as the clearance on the stock buckets with the new cams was too tight.

And the clutch cmc just went, English Racing put in a stage 2 competition clutch in last fall after the clutch went on their dyno.

It seems to be running a bit hotter so I am getting an oil temp gauge to see whats up with that


So the car is currently sitting in the shop awaiting parts...

 

Different dyno, different day, different weather, blah blah blah.

A plot of a stock car on this dyno would help clear up the picture. A typical dynojet number for a stock X would be around 240whp. It wouldn't surprise me if this dyno read about 210whp.

 

Even still, a black should make wayyyy more than that on 91/92 here.

 

This^

I don't even think ef4's and blacks wake up till over 25psi. They need high boost to shine.

 

No, not 'even still'. I have a car that will put down 250whp on one particular dyno and 210whp on another dyno. You can NOT compare between different dynos with much certainty, PERIOD.

This comparison is valid. The cars were tested on the same dyno with same fuel. Sure, weather conditions are a bit different I'm sure, but that can be taken somewhat into account by the correction factor. And besides, the difference is so huge that the variation due to temperature is insignificant.

What do these two graphs show us: at 7600rpm with the same boost, the EFR7670 is making way more torque and power. About 60whp. Why? Because the FP Black is stuck with the dinky *** stock turbine housing designed for a much smaller turbine wheel. End of story.

"oh, FP Black can make more power with more boost" blah blah. What, you don't think the EFR won't make more power too with more boost with better fuel?

 

While this is true, to an extent, I wasn't talking about the comparison specifically. I was referring to overall numbers. (I know, I know, a dyno is a tuning tool, not a number-peen tool). There's still a percentage that dynos should be within each other (unless they're horribly calibrated).

 

I dont have a plot of the stock un-tuned car. Tariq/RG does have plots of the stock car with a tune. I bought it third hand with about 50k miles on it, its a California car and Im up in Vancouver Canada. When I put it on the RG's MustangDyno it did 240 whp so we presume it had already been tuned, but we dont know where, when or by whom. The stock un-tuned evo X's they have seen dyno at 208 - 210 whp (though they had one that tuned up to 220whp, but it seems like a one-off). Using a correction factor of 13%, 210 MD whp =~240 DJ whp.


with intake, 3" TBE, 3" bell mouth down pipe, GS 3-port, and 100% meth I was putting down 310 whp (352 whp on English's Dynojet)
at about 28 psi

and as for weather its always raining and 15 degrees C.... (but its a dry rain...)