I will make an official thread later tonight with my dyno graph, but yes, almost a 70hp gain at the wheels with an EF3.

I mentioned this a few posts back, but you probably missed my whole EF3 build list. It wasn't just an EF3 I upgraded to from the stock Evo 8 setup.

In a nutshell, I installed:

EF3 w/anti-surge housing ..... previously Evo 8 turbo
Buschur Ported & Coated manifold ....... previously stock manifold
MAPerformance 02 dump housing ........ previously stock 02 housing
FIC 1050 injectors ....... previously stock 550s
Removed EGR system
GReddy diverter valve .... previously a stock Evo 9 valve
Running almost 30psi, up from 24psi I was making on the stock setup.

So, it was a big upgrade. I went from 330hp/299tq to 396hp/343tq on the STM dyno. Roughly 70hp and 40tq.


EDIT> And yes, this was on 93octane.

 

I think bitterchild was implying that seems like a low gain, not a high one.

 

this....

 

That's a pretty low gain, tbh. Should be more like a 100-130 whp gain. On my Evo 8 stock 10.5 turbo to the EF2.5 I went from 370 whp to 450 whp, and it's still not the max that I'm going for on this turbo/fuel setup. Maybe it's because it's such a low reading dyno...?

 

I did a ton of stuff at once, basically went from stock with a tune to almost full bolt on and got about 120whp with the EF3

 

Ready to eat crow? Here, have a plateful.

Here's tonight's run with 3 half-turns of preload vs the previous dyno I posted up with zero preload.

Attachment 333919

It made 8-9 psi more at 3900 RPM (19 psi at 3900 RPM with zero preload, 28 psi at 3900 RPM with 3 half turns)

So who still thinks the EF2.5 spools lazily? Look at that difference in torque/spool...

Zero preload @ 4078 RPM = 266 wtq
3 half turns of preload @ 4078 RPM = 326 wtq

I will test 4-6 half turns of preload and see if I can get it to spool even faster (within safety margins, of course.) But these results are even better than I expected considering 3 half turns is very light preload!

 

Here is my EF2.5 as of right now vs. my Evo 8 10.5 stock turbo via Virtual Dyno, done on the same road, same time of night:

Attachment 333918

 

That is much improved! Looks like it spools faster than my EF2.

 

Your EF2 needs more preload and your MIVEC needs to be adjusted. An EF2 on an Evo 9 should spool about the same as the stock turbo. You should be outspooling me by 500-600 RPM.

 

You guys must not be familiar with STM's Mustang Dyno.


Remember, this was a real dyno. Not simulated dynojet numbers. I'm also not trying to squeeze every last horsepower out of this setup - it was a fairly conservative tune.

 

You realize a mechanical dyno is just a rolling simulated calculation too, correct? And that it doesn't simulate the load/aero/airflow realistically like a road/virtual dyno does?

Virtual Dyno has been proven to be within 1-3% of mechanical dynos when calibrated correctly. Mine is calibrated correctly on the same perfectly flat, smoothly paved, neutral grade road.

If anything, you should be throwing up Virtual Dyno numbers too so that you can get your own results with real airflow and load that the car encounters.

That being said, if you're 396 whp on STM's dyno, I am going to estimate you are at 450 whp on an average dynojet, which is very impressive for 93 octane! And also in line with what I'd expect from doing a big upgrade like EF3, intake manifold, etc. So on second thought, your numbers aren't that low at all.

 

well the point of my post was that your numbers seem reasonable... not low. I was trying to add more data to the assumptions

I made 120whp more with tons of stuff done at once. Basically every part between the exhaust ports and the intake ports on the head was changed at once...

 

Does anyone know what size the compressor wheel is on an EF3 turbo?

 

76mm

 

55.5mm inducer and 76mm exducer