Precisely today, I went to the Dyno to check what did I gained with the following mods:
1. aFe Takeda Stage 2 CAI
2. xForce with Varex cat-back
The results were a little disappointing.
View attachment 87644
Looking for the pics, I found a ridiculous coincidence. Last year precisely on June 3, 2021, I tested the car with only one mod, the RaceChip piggyback chip. With these results:
View attachment 87645
From 192 to 236 hp and 214 to 281 lbs torque.
Today (yesterday) June 3, 2022, I only got from 236 to 243 hp and 281 to 296 lbs. torque.
RaceChip GTS gained 44 hps (23%) and 67 lbs torque (32%) for less than $500.
CAI + cat-back gained 7 hps (3%) and 15 lbs torque (5%) for about $1,400 plus some $400 additional installation charge.
Both mods gained 51 hps (27%) and 82 lbs torque (38%) for about $2,300
Now one for those "turbo heads" in the forum, the dyno operator pointed me to see how rich the mix is, and checking the last dyno test, I found the same behavior. I believe I know the answer to my question. The car's computer must be tuned to accommodate the mods. And my problem is that I didn't want to do that kind of tweak to the engine. So now I must decide to keep down the rabbit hole or take the blue pill and stay with what I got so far. 🤔🧐
Don't get me wrong, I'm a happy camper so far. The difference I felt driving the car, I believe, was the improvement in torque and not hp.
Cheers!
There is no "tweaking" involved, but hold on a second.
Are you saying all you did was install the Racechip and using the base map that it's set on when you bought it? I find that highly unlikely.
What exactly have I done to tweak the JB4? Nothing!
All I have done which is what a few people have a problem with is install the JB4, that's it. No intake, exhaust, plugs, etc, etc.
The car picked up 4 hp with lighter wheels.
Map 0 = 195 (91)
Map 1 = 211 whp (91)
Map 2 = 216 whp (91)
Any higher than that no power was made, the knock limit of 91 is right there and applies to using "all the boost" on other devices such as the Racechip.
All I did was change the fuel.
I mixed pump E85 up to 40% with 91, that isn't ideal at all and not for the reasons you typically think like concentration of ethanol.
Map 1 = 222 whp
Map 2 = 232 whp
Map 3 = 240 whp
Map 4 = 246 whp
Map 5 = 251 whp
Map 7 which is WMI made 227 whp
The only torque numbers I remember the highest which is 271 ft lbs.
In discussions I often have with Olszewski is the template of Tune, Intake, Exhaust, Downpipe is very 1990's.
You need far less if the time is taken to optimize each part you have invested in.
The reason why your gains are low with cat-back exhaust means that there isn't much restriction with the stock exhaust, what you wanted was more noise, not more power.
Same with the intake, early on looking at the AFe and comparing that to the intakes I've had on other vehicles, I knew this was the best intake for power production, the others are for intake noise.
The main cork in the exhaust is the tiny turbine housing of the stock turbo, nothing you do will reduce the back pressure to psi ratio to 2:1 still not 1:1 (ideal), which is often 3:1 in factory production cars other than replace the turbo, I said replace not add larger wheels. That middle step does help but for the price I am not so sure; If I can figure out an affordable cast manifold option the rest of it is easy, higher gains at all boost levels.
If the base boost is 18 psi, you want ideally 11-12 hp or more per pound from there. If max is 25-26 psi, then you see the problem I see with my dyno results.
The main gain from E85 is the oxygen added. It has more oxygen per pound than a gasoline period. You don't see it with the stock turbo on this car, the gains are good but not like a aftermarket turbo.
With a much bigger turbo the gains over pump gas are ridiculous.
The focus should be improving how much power you can make above the stock boost levels. When knock is eliminated as far as ignition advance goes, power from 4+ psi is 222 whp (Map 1).
You can gain more than that, but the focus needs to shift -
How cool can you get the air coming into the turbo, reduce turbo exit temps AND reduce intercooler exit temps.