Saab 92 Forum : Saab92x.com / turbo boost & lag?

subifan12 · 2012-07-03 13:26:05

on the 9-2x aero, automatic, what rpm's should the turbo lag & boost?

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Homyality · 2012-07-03 14:41:28

Well, there is always turbo lag, especially with all the piping the Boxer engine needed to get to the turbo. It's just, about how long the airflow takes to get to the turbo. So, for that, as long as there is boost coming in, there will be turbo lag. In the new Boxer in the BRZ/FRS, they fixed this issue by putting the turbo in a spot where there is next to no piping.

The boost kicks in around 2.5-3k RPM, with the stock turbo. Well, with the manual at least. I would assume the automatic would be the same.

Homyality · 2012-07-03 15:17:49

On the new engine design that has the turbo. Let me find a picture.

Edit: Found it.
http://carrolodex.com/tag/gt-86/

Last edited by Homyality (2012-07-03 15:22:43)

subifan12 · 2012-07-03 15:23:38

itsnotmeitsyou wrote:
Homyality wrote:
Well, there is always turbo lag, especially with all the piping the Boxer engine needed to get to the turbo. It's just, about how long the airflow takes to get to the turbo. So, for that, as long as there is boost coming in, there will be turbo lag. In the new Boxer in the BRZ/FRS, they fixed this issue by putting the turbo in a spot where there is next to no piping.

The boost kicks in around 2.5-3k RPM, with the stock turbo. Well, with the manual at least. I would assume the automatic would be the same.
What turbo? I am missing some obtuse reference?

2500-3000rpm's is about right, I was just curious, I excpected the boost to be more on demand, but I guess with a few modifications to the exhaust/turbo/intake/computer managements....I can get more power, but then again I might as well just go buy a new wrx if I'm going to spend that kind of money.
I'm quite dissapointed with the specifications on the newly released BRZ/FRS, I was told months ago that there was going to be an option of awd and a turbo depending on the brz or frs, give it 5-7 years, the brz will be priced under 10k and everyone will be turbocharging them.

Last edited by subifan12 (2012-07-03 15:27:54)

Homyality · 2012-07-03 15:38:02

Well this first year was just a feeler kind of, getting it introduced to the market. Next year they are releasing a "STi" version with a turbo in it, refer to the picture above. I believe early estimates put it around 270whp.

The purpose of the FT86 project was to make a RWD, compact car that was as low to the ground as possible, which was accomplish able with the Boxer design. Personally, I'm not bothered that it does not come in AWD. At the weight of the car, if you ask me, it would probably be better off as a FWD, but that's just my opinion.

When you consider the car has a 2.0l engine in it, without turbo, and making 230hp, it's really not bad. Think of it as making as much power as your Aero is now. The turbo version will have more torque in the low RPMs, allowing bigger turbos that spool higher (but start spooling later) to become more relevant.

As per doing mods to your car, keep in mind the Saab 92x Aero is, by all means, exactly the same car as the 2005/2006 Subaru WRX. You have the same engine, the same turbo, the same exhaust and suspension.. All essential parts are the same. The only difference are in some of the exterior parts and the interior is much nicer. Doing turbo prep and upgrading the turbo isn't a horrible idea. The EJ205 can handle a 16g/18g turbo with the right mods done to the car to handle them. With about 5-7k to spend, you can get your car up around 400whp without too much effort.

Disturbance · 2012-07-03 17:46:34

Homyality wrote:
Well this first year was just a feeler kind of, getting it introduced to the market. Next year they are releasing a "STi" version with a turbo in it, refer to the picture above. I believe early estimates put it around 270whp.

The purpose of the FT86 project was to make a RWD, compact car that was as low to the ground as possible, which was accomplish able with the Boxer design. Personally, I'm not bothered that it does not come in AWD. At the weight of the car, if you ask me, it would probably be better off as a FWD, but that's just my opinion.

When you consider the car has a 2.0l engine in it, without turbo, and making 230hp, it's really not bad. Think of it as making as much power as your Aero is now. The turbo version will have more torque in the low RPMs, allowing bigger turbos that spool higher (but start spooling later) to become more relevant.

As per doing mods to your car, keep in mind the Saab 92x Aero is, by all means, exactly the same car as the 2005/2006 Subaru WRX. You have the same engine, the same turbo, the same exhaust and suspension.. All essential parts are the same. The only difference are in some of the exterior parts and the interior is much nicer. Doing turbo prep and upgrading the turbo isn't a horrible idea. The EJ205 can handle a 16g/18g turbo with the right mods done to the car to handle them. With about 5-7k to spend, you can get your car up around 400whp without too much effort.

According to Subaru's site, the BRZ makes 200 HP, not 230. Granted its not a massive difference but I've never seen a reference to 230 HP aside from speculation before the specs were released.

Homyality · 2012-07-03 23:05:48

Oh, well, I'd read somewhere a few days ago that mentioned 230.

I stand corrected, thank you. Either way, for a 2.0, that's a pretty good number.

phillipj · 2012-07-03 23:39:46

Homyality wrote:
On the new engine design that has the turbo. Let me find a picture.

Edit: Found it.
http://carrolodex.com/tag/gt-86/

Thanks for the pic/info. That's really cool from a tech perspective. And, yes, the current BRZ is def. n/a

It will be interesting to see that car in turbo form. I really like the brz concept turbo or not though.

Homyality · 2012-07-03 23:45:46

Hell yeah! Definitely a step in the right direction for Subaru. Plus, it's our sister car smile

JimH · 2012-07-04 09:36:46

Going Stage 2 is inexpensive and will reduce the turbo lag. Buy a used Cobb AP and a shorty downpipe. And for reliability, gut the uppipe or change it.

subifan12 · 2012-07-04 10:12:11

I also noticed on my 9-2x aero that the exhaust seems to be deeper & louder than most factory wrx's, I have a few wrx's that drive by the house on a daily basis and they sound alot quiter, my exhaust/muffler doesnt apear to have been gutted and there are no leaks, from the header/downpipe to the muffler tip is all subaru so maybe the 9-2x aero's have a different exhaust setup then the wrx? I'm not complaining, I think it sounds awesome and better than any factory wrx. My uncle who is a lifetime mechanic and car enthusiast came over to the house the other day to see the 9-2x, and he asked "why is it so loud?" biggrin I said "It's supposed to sound like that, it's a street legal race car" roxor