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Old 04-17-2014, 12:16 PM   #1
Scooby Newbie
Member#: 379979
Join Date: Jan 2014
Default Stage II Low RPM reliability

Just wanted to poll some tuners to see if my line of thinking is reasonable.

Just picked up a 15 STI and am for sure going Stage 1, however I do like idea of a little more response on the low end of the tach, so a stage II tune is also a possibility.

However, what I have heard is that low RPM with lots of throttle is pretty hard on these cars, and am wondering would stage II make that even worse?

For example. In daily driving I picture leaving the car in 3rd and pulling out from a corner at 2000rpm, give it some throttle and ride the nice torque surge up to 4000rpm or so. But is it easier on the car to take the same corner in second and pull from 3000rpm up to 4500?

Really high numbers aren't my goal with the car, and the Stage 1 tunes I have seen satisfy the power I want ( for now), so though it would be nice to get the better power delivery of stage II, if its harder on the car with the way I usually drive I would be better to stay away from it.
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Old 04-17-2014, 12:53 PM   #2
Back Road Runner
Scooby Guru
Member#: 60082
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Minnesota
2004 Forester STI


Don't think too hard about this. The car will be fine either way just as long as the car's tuned properly and doesn't knock. It's that knock that kills engines. Sorry, I'm not a tuner, but I do think your over thinking this. The engine won't care that you're at 2k with the throttle plate wide open. You can't do damage without an excess of boost & timing for the fuel type, aka generating knock and excessive forces.
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Old 04-17-2014, 01:14 PM   #3
Scooby Newbie
Member#: 363436
Join Date: Jul 2013
Chapter/Region: MAIC
Location: VA
2011 WRX Cobb Stg 1
WR Blue Pearl


I can't say for sure how vast the difference is between my '11 WRX and your '15 STI, but I'm currently Cobb Stage 1 and I know that if I punch it from 2000 in 3rd, I will be met with a good bit of lag before I notice any torque surges. The bogging sound is loud and shakes the whole car. After someone once asked me if I had a 15" subwoofer in my car (I don't), I now always heel-toe or rev match into 2nd when taking a spirited corner.

Edit: I drive a 5-speed and yours is a 6, so I've left my above comment visible only to showcase how easily one can sound stupid on the internets.

Seriously, though. I imagine anything that increases the low-end will also make it easier to pull from that lower RPM. Kinda makes sense. I can't see how Stage 2 would hurt you.

Last edited by flat4banger; 04-17-2014 at 01:19 PM.
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Old 04-17-2014, 01:24 PM   #4
Scooby Newbie
Member#: 321598
Join Date: May 2012
Chapter/Region: Tri-State
Location: Somerville Nj
2012 WRX
Obsidian Black Pearl


As per my personal experience and research, it is a good idea to avoid WOT before 2500rpm. Especially in 3rd gear and up.

Put 1000 niles on the car, do your first oil change and then upgrade to stage 2... You'll find yourself driving with a huge grin
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Old 04-17-2014, 03:25 PM   #5
Scooby Newbie
Member#: 361325
Join Date: Jul 2013
Chapter/Region: E. Canada
Location: Ontario
2010 STi
Dark Gray Metallic


Low RPM with lots of throttle is hard on most cars: high-cylinder pressures promotes detonation which can damage pistons and buffet rod bearings. The good thing about the EJ is that it has a pretty low compression ratio so there's not as much of a chance of detonation under these conditions (especially before boost builds) but it can happen.

It's generally good to avoid lugging any engine, but especially these ones.

Take advantage of the close-ratio 6-speed and keep engine RPM up -- or stay in higher gears and keep your foot out of it.
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Old 04-17-2014, 05:36 PM   #6
Scooby Specialist
Member#: 316415
Join Date: Apr 2012
Location: Elk Grove, CA
2006 WRX


^^^ yaaaaap

Drive it, you'll continue to adapt how your car acts, you'll feel sluggish down that low in third gear and you'll change your driving habits. When you feel the slug you won't like it, thus knowing your car doesn't like it.
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Old 04-17-2014, 06:59 PM   #7
Big Ron
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
on car parts so PM
me b4 j00 buy


1. The 2015 has been out for 15 maybe 20 minutes and we know know zero about it other than it is likely like past years' models so don't put the cart in front of the horse.
2. There is no such thing as Stage II or Stage I as those are both marketing terms and, in fact, the WRONG marketing terms as they go by 1, 2, etc. and not Roman numerals.
3. As in item 1 above, there are ZERO stage 1 or 2 tunes from ANY maker so quit wishing and wait.
4. What you have "heard" so far is 100% wrong so that means you have not researched enough. Read the sticky threads at the top of this forum....fill out your profile....talk to locals via your local regional forum....PERFORM SERIOUS RESEARCH and wait for tuning companies/tuners to start working on the 2015.
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