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View Full Version : Almost Stock Evo X: +51 hp & +43 ft-lb



Looney Tuning
04-12-2009, 06:33 PM
This Evo X belongs to Mizuvo. Its only power mod was a Works drop-in filter. Aside from that it is 100% stock. The last two Xs that I tuned had an AEM intake and a TBE. I wanted to tune an almost stock X and see how the tune differs. The car also did not have the factory re-flash done to it, so it was even a better candidate for a tune.

All runs were done in 4th gear and each chart contains 4 back-back runs. The numbers w/o brackets are averages and the numbers in brackets are peak numbers.

Because it was running the original flash, it ran extremely rich. I felt sorry for the poor oxygen sensor. Here is the before and after AFR on the car.

http://www.sr20deracing.com/EVO/Calvin/afr_before_after.gif

The stock AFR dips into the 9s the moment the car goes into WOT. It stays in the 9s all the way to 6000 rpm and then climbs back into the low 10s by redline. What a stupid-stupid tune. I had to massively lean out the car to get it back into the mid 11s. From 3500-4000 rpm I leaned out the car by 2 full AFR points; from 4500-5000 rpm by 1.8 AFR points; from 5500-6000 rpm by 1.55 AFR points; and from 6000 to redline by ~1.3 AFR points.

The boost was also adjusted. The stock boost peaked at 4000 rpm registering an average of 21.28 psi (21.90 psi max) and tapering to an average of 13 psi by redline (13.90 psi peak).

http://www.sr20deracing.com/EVO/Calvin/boost_before_after.gif

The tuned boost was not only higher by an average 2.6 psi at peak, it was also reached at 3500 rpm. By redline average boost was 4 psi higher than stock. Peak boost hit 18.30 psi in one of the runs whereas stock the car could not break the 14 psi barrier.

The best way to show the differences is in the following graph:

http://www.sr20deracing.com/EVO/Calvin/boost-afr_chart.gif

Notice how much leaner the car is than before. I suspect that the AFR meter flat lined because the car was so rich. It is entirely possible that the car ran richer than 9.60:1 when we logged it, but the meter could not go that low. Also note how boost peaks earlier than stock and holds better to redline than stock. The gain in boost in the mid-range is especially fat and meaty.

Below is the power increase that the car experienced from the tune. I averaged the last two stock runs and the last two tuned runs.

http://www.sr20deracing.com/EVO/Calvin/dyno_before_after.gif

The car made gains everywhere in the power curve. The biggest gains, though, were above 5000 rpm. The biggest average power gains were:

51 hp between 6000-6500 rpm
43 ft-lb between 5500-6500 rpm

The other power gains are noted on the chart.

The Evo X is begining to impress me. It makes for a great daily driver, something that I do not have in my Evo 9. There might just be a burnt orange Evo X in my driveway at the end of 2010.

1SiCkeVo
04-12-2009, 07:07 PM
wow thats really impressive. Car is stupid rich from the factory so a tune really helps out the X. Im glad your tuning Xs naji A+ work as always

EvoJoe
04-12-2009, 09:07 PM
Great results as always Naji. I kind of wish on owning a X MR as a daily driver but I'm still wondering if the transmission can last with some mods.

Looney Tuning
04-12-2009, 09:40 PM
Great results as always Naji. I kind of wish on owning a X MR as a daily driver but I'm still wondering if the transmission can last with some mods.


The SST tranny is fragile. It cannot handle wheel torque beyond 300. The thing I do not like about the 5 speed Evo X is that gear ratios are too short. The revs are high in 5th gear at 70-75 mph.

mangoes
04-13-2009, 12:22 AM
holy balls thats awesome. I am happy you did a tune on this car, my car is the same with just a works drop in =).

evazerone
04-13-2009, 02:40 AM
I didn't know the SST could only handle that little torque... makes me glad that I didn't bother considering it when I bought mine. Good to hear a simple drop-in and tune could give so much.

Looney Tuning
04-13-2009, 07:37 AM
holy balls thats awesome. I am happy you did a tune on this car, my car is the same with just a works drop in =).


Hit me up and let me tune it. At $240 for a tune, it is the best bang for the buck mod that you will ever do.

oxyi
04-13-2009, 08:11 AM
damn.. holy crap.. such a nice number. good job !

mr.4g63
04-13-2009, 09:10 AM
very nice! good job naji O0

silvrEVOIXn818
04-13-2009, 11:39 AM
congrats mizuvo. Well done Naji. O0

mizuvo
04-13-2009, 12:12 PM
Thanks Naji!