PTUNING Turbo Kit Owners Topic

[andrew20195]

Originally Posted by bjun

And wouldn't straight pipe mess with back pressure?

Originally Posted by Sportsguy83

For turbo, you want the LEAST amount of backpressure possible so removing the cat is actually a great thing.

For NA you also want the least amount of backpressure. It's all about pressure wave tuning, backpressure happens to be an undesirable side effect of pipe size in some (most? all?) applications.

With turbo you want essentially no exhaust behind the turbo (really a conical diffuser for best performance), with a good pressure differential across the turbine. That's why turbo cars usually run smaller exhaust runners than NA versions of the same displacement. In the particular case of our cars with stock header/PTuning turbo, there is likely a pressure drop across the catalyst, so it would make sense going to a catless header would improve performance. You ideally want the pressure drop across the turbine, not before it.

[rb6freak]

Hey @bjun I'm going to have to agree with others. The stock cat will be fine for some time. just don't know how long. @Sportsguy83 is right about the sound. The turbo is a giant sound diffuser / resonator whatever you want to call it. I wouldn't worry about it being more than a few decibels higher, maybe 10ish? Just a guess.

I'm planning on replacing my stock exhaust manifold too. If you're worried about smog (not sure the requirements there), you can simply reinstall manifold and load your current tune file before you go. If you're worried about blowing smoke and getting ticketed, well... racecar...

Yes you can install a cat post-turbo. You'd have to take that big 3" pipe after the turbo and have muffler shop cut it and install.

My vote - PTuning header ;-)

[rb6freak]

Oh, and you'll need a retune to get the most power. I'm assuming your car will still be drivable and still perform relatively well. But yeah tune for sure. PTuning should eTune you since they have all your data already and you went with their recommended setup.

[bjun]

I'm not worried about smog but just wanted to keep it legal for convenience. It doesn't matter either way though. And I'm just worried about the tune since I do not want to drive 25-30 hours back to VA. but since you mentioned that I can get etune I will buy the header when it comes out. That was my only real question whether or not I can get etune lol. So thank you for answering that. Oh and I've read on several threads that straight pipe sounds awful on the 86 so avoid it if you can :p

[JerryMichaels7]

normally a straight pipe is after the header or in your case the turbo. Getting the header with no cats doesn't make it a straight pipe imo. My guess is you got their 3 inch Duel wich has mufflers and a resonator, so therefore 100 percent not a straight pipe

[sw20kosh]

So we have one rear-mount turbo car that blew out the main cat while pushing 18 psi on a built motor? Are there any other cases?

I am hopeful that it turns out 6-10 psi and a proper tune don't grenade the cat. It would be great for @ptuning to chime in here.

I would like to run around with the stock manifold for a while but if a few track events are not an option with the stock manifold in place...

[SmsAlSuwaidi]

Originally Posted by sw20kosh

So we have one rear-mount turbo car that blew out the main cat while pushing 18 psi on a built motor? Are there any other cases?

I am hopeful that it turns out 6-10 psi and a proper tune don't grenade the cat. It would be great for @ptuning to chime in here.

I would like to run around with the stock manifold for a while but if a few track events are not an option with the stock manifold in place...

It's doable I think, but I wouldn't be comfortable doing it Especially on a track. You stated you want the stock manifold, well maybe just gut the cat out to stay safe?

[ptuning]

Originally Posted by sw20kosh

So we have one rear-mount turbo car that blew out the main cat while pushing 18 psi on a built motor? Are there any other cases?

I am hopeful that it turns out 6-10 psi and a proper tune don't grenade the cat. It would be great for @ptuning to chime in here.

I would like to run around with the stock manifold for a while but if a few track events are not an option with the stock manifold in place...

Sorry guys, I've been pretty busy with dyno tuning recently and haven't been able to chime in here as much. I'll try to answer some of the other questions tonight though. In regards to running the stock catted header, I don't foresee it being a problem, and here is why:

- Most people will eventually replace their header at some point in time, assuming they don't already have an aftermarket header in place from their days dabbling with NA mods.

- Since we don't have Subaru or Toyota corp money to test the limits of the stock cat, we do tell owners to look into running an aftermarket header should they decide to run high boost with E85, race gas, WMI, or built lower compression motors.

- I don't see any issues arising when running the stock header on pump gas. I feel you'll reach the detonation limits of 93/91 pump gas way before you reach the limitations of the factory cat.

- Some will argue that the pre-cat on the EJ20 motors were a problem. Truth be told, some cars saw 100K+ miles without issues. Others probably died from abuse, etc. Bug eye owners don't all necessarily take care of their cars. The EJ20, being a factory turbo motor ran pig rich and used a tiny turbo that ran very high EGTs....things not friendly to cats.

- We do not run pig rich with our turbo setup, since we advise dyno or ETuning after installation. Also, we definitely do not have issues with high EGT's, not with the GT3076R turbo we're using. We generally tune for 6-9.5 psi on pump gas, since this is where I feel we'll see diminishing returns with the addition of boost.

Hope this helps to clear things up. Oh, and Kanundrum tracked his car about a month ago at Summit Point Raceway (Main). Granted, his HPDE level with the particular organization didn't allow for open passing during the 30 minute sessions, he was still able to easily see 120+mph down the back straight.

We'll have a lot more track info on our turbo set-up in the coming weeks and months. Many of our customers will be tracking their cars over the summer. We'll also be putting our very own shop car through it's paces at local track events too. We need to put our Ohlins R&T coilovers, huge StopTech brakes, and R888's to good use.

- Toan

[bjun]

Ah thank you Toan @ptuning! I plan on tracking starting May so I just wanted to be a little cautious. I will also post my experience with the kit on the track as well.

[sw20kosh]

Lol how does this kit have such good low end grunt? I am enjoying this. Once 4.5k hits though... vroom

[sw20kosh]

Originally Posted by mkivsoopra

and the rear top is pushed farther into the engine bay, so you can't use the intake shroud pieces that come with the turbo kit. You can make it work... I'd just rather not.

I have the robispec radiator and the ptuning intake shroud does fit just fine although a bit snuggly. =)

[WhiteCar]

Will there be a RHD version of this at all?

[kanundrum]

Video of More Autocrossing Inside the car. Turns out I had a bad set of tires and I had Justin (Master Tech at Ptuning) @Blown_xa Test drive the car to make sure my skillz were not subpar. Turns out we had the same results and the tires were crap.

[ame]http://youtu.be/DxowkG6JDMQ[/ame]

[ptuning]

Originally Posted by WhiteCar

Will there be a RHD version of this at all?

There is a very good chance that we'll be able to develop a RHD turbo intake system to work with our existing set-up. Once we've completed production on our header, oil cooler, and WMI system, we'll definitely revisit the RHD models.