EFR 7670 IWG VS 6265 Dyno comparison
 

Recently Lucky7Racing picked up an EFR 7670 IWG & one of our T4 Shorty IWG turbo manifolds for their shop roadcourse FC3S.

Changes made between runs to keep in mind;

6265 T4 .84 DBB
3" exhaust system straight through
Greddy Cast FC manifold ( EWG- open dump WG)

EFR 7670 T4 .92 IWG( 5761 ) for sake of wheel size comparison)
3.5" exhaust
Turblown IWG Shorty Welded Manifold

Video & more data( boost plots etc) to come as they are currently still tuning this right this moment.

Red is EFR 7670 & blue is 6265

Those EFR's really are something else..

I can't wait to get my 7670! :D

What kind of ports on this engine?

Same boost pressure?

I am not sure if peak boost pressure is the same or not.

Down low where most of the gains are the previous blue setup cannot reach any more boost pressure. It is WAY below its full boost threshold( what a lot of people refer to as lag). Without adding nitrous there is no way to improve power on the low/midrange substantially to the blue powerband.

The red powerband I am sure is running a lot more boost in the low & midrange.

I requested the video overlay the boost pressures between the two setups.

The point of this post is to show there is potential for a lot more power under the curve with an EFR turbo system. I bet they will have to relearn how to drive this car, because its going to feel like an animal compared to before.

It is a streetported engine by Lukcy7Racing. Keep in mind it is a FC engine, and in my experience FD motors make more power and usually have better boost response( at least over the S4 motors).

Looking good so far.

They should be able get it to spool better once its tuned, looks like almost identical set up as my TII (I don't know if they have 8.5:1 rotors like I did).

Looks like they are running lowish boost so far? Like 21psi? They will gain 50ftlbs + torque 3-5,000rpm once they up the boost.

awesome graph...just awesome!

*blink*

*blink*

This is the part where peejay wonders if you can get EFR turbos with Grand National 3-hole inlets, because DAAAAAAAMN.

I would love to get my car on a dyno.

my car is seeing positive pressure at 1250 rpm in all 1st 2nd 3rd and 4th

Yes, dyno it. Please!

My EFR was making 300rqtq by 3,000rpm and 400rwtq by 3,750rpm.

Just in case others hadn't seen this yet. 26psi to 5,000rpm fading to 21psi by 6,500rpm.

https://cimg8.ibsrv.net/gimg/www.rx7...4b57fc2cf3.jpg

I know someone can make more low end because I wasn't surging it, a basic ass T4 style manifold and .... ran out of injector duty cycle.

Don't make me do it, I want to move on to a more responsive turbos (couple 7163s)

Here is from the tuning on Dyno Dynamics-
You can see from the Blue line here where there was no line on the wastegate if I had more injector I could have made a lot more torque 3,200-4,000rpm.

https://cimg4.ibsrv.net/gimg/www.rx7...95ba69c3ee.png

Mmn, just ran the #s off that 28psi run that netted 28.7hp @ 4,000rpm on the Dyno Dynamics.

That was 369ft/lbs torque Dyno Dynamics whereas my 26psi runs were 349ft/lbs Dyno Dynamics or 401tq on the Dyno Jet.

So would have been 424ftlbs torque Dyno Jet at 4,000rpm at 28psi boost. Not actually that much more epic than 401ftlbs...

Edit- actually I see peak boost before the Exhaust Manifold Pressure caused VE crash from WG not opening was closer to 3,800rpm. If peak HP was with with peak boost then torque was 447ftlbs Dyno Jet at 3,800rpm which is pretty epic after all...

Here is a small update( its still not done yet).
https://cimg3.ibsrv.net/gimg/www.rx7...d052426a01.jpg

Do I spy another engine that likes to run rich like mine?

I am not sure, I didn't tune it!

I did speak with the owner of the shop, and he told me its incredible. He cannot believe how fast it is. He agreed with me that it feels like a 20B.

https://instagram.com/p/8pQeCSjYEW/?taken-at=227384556

The post above shows AFRs flat lined a tad leaner than 10:1 AFRs 2,500-7,000rpm in the bottom of the pic in the Boost and AFRs section.

I meant I am not sure if they tried a leaner tuner and if it made more or less power.

We just got a 7670 FD running here, and are wrapping up another this week. I would love to run one to 28 plus psi, but we do not have enough pump on either car..

If 1 EFR could make a 13b feel like a 20b.. What would a couple of nicely matched pair EFR's make the 20b feel like..

i wonder.. :ponder:

Pump fuel?

If 1 EFR could make a 13b feel like a 20b.. What would a couple of nicely matched pair EFR's make the 20b feel like..

i wonder..

If they were sequential it would feel like a Viper V10.

If parallel it would feel like a 13B because you have to half the flow per boost and that works out like poop on the surgelines.

I have the same question. This isn't pump gas, is it? 400 seems like a lot for a 7670 on pump gas.

E85.

Wouldn't a better comparison be a 5862 compared to the 7670. Seems to me a 6265 would be 8374 competitor.

Yes an 6265 is the same size as an 8374, and would be a more fair comparison. The customer already had this 6265 and it was not intended from the get go to make a comparison dyno run. They were just shocked with the difference and decided to overlay it.

I recently did a more " fair" comparison test between our TDX57 turbocharger and our cast EFR 7670 kit. However it was not exactly apples to apples( E85 vs pump, no cat, vs cat, and ported vs non-ported, all else equal). As suspected the EFR responded a LOT faster, and was actually faster during roll racing.

I think it's more to illustrate that, despite being a smaller turbo that reaches boost threshold much faster, it still puts down just as much power. It flows better than you'd expect for the given size wheels and housings.