tfbmiata

So this is probably going to sound ridiculous, but such is life. Any thoughts or ideas on ways to run a turbo'd miata without boost for track days without causing damage etc? I currently have a mildly turbo'd miata and I do track days with my friend and while the boost is fun, I've lost something with track days not being able to go around the track with him competitively (he doesn't have boost). Without doing anything major for hours on end each track day, can anyone suggest any way to safely run my setup with out the power?

My current thoughts are:

1. Bypass the cold side from the intercooler and just have boost being built dump under the car or something while setting up an air filter on a small short ram intake on the throttle body.
   1. Flaws would be that this would probably still build up heat like I was boosting, but I'm already setup to handle that.
2. Some kind of block or bypass on the exhaust manifold
3. Remove the wastegate and let exhaust go through that tube?

TurboTim

iTrader: (9)

Do you have an external or internal wastegate? You can wire open the wastegate to limit the amount of boost you make. This would be the simplest solution.

Do not disconnect the turbo from the intake unless you also add a restrictor to the outlet on the turbo (and thereby create a hell of a whistle), or else you will quickly exceed the maximum turbo shaft rpm.

I remove my turbo completely when I want to go turboless, but that's easy & quick for me with my vband turbine inlet and outlet.

sshamrockk

Not necessarily true. Without the added boost it's unlikely the stock motor can move enough air to overspin a turbo. But it can vary setup to setup and best to test yourself.

Greg tests this myth on his setup and deems it safe for his car.

34:21

TurboTim

iTrader: (9)

Yeah i guess it also depends on the size of his turbine.

My 1.6 destroyed my greddy mitsu turbo with the IWG flapper disconnected from the actuator on a short drive from my dad's shop to my house.

tfbmiata

did you just have a pipe made to fill the gap of the turbo between the exhaust and downpipe? What did you do with the coolant and oil feed/return lines? I suppose I could make an AN6 and AN8 straight line for each of those and loop them. That wouldn't be easy, but I also wouldn't call it hours and hours of work.


Its an EFR6258 which i think greg uses on his car and then upgraded to a 6758.

sixshooter

iTrader: (12)

I wouldn't take Greg's word for anything. He doesn't keep s*** long enough to know if it works or not. Yes you can over speed a turbo without any back pressure.

curly

iTrader: (25)

But if it's on YouTube, it must be right, right??

EFR wastegates can hit the turbine wheel or nut when completely open, so I'd suggest a solid rod to lock the wastegate wherever your current wastegate opens too, and no further.


Source: https://www.miataturbo.net/diy-turbo...carnage-88736/

Alternatively, you could remove the turbo/mani/downpipe and install a header. However if your exhaust is a little loud now, it'll be crazy loud without a turbo. There are solid AN caps and plugs you can buy to plug oil feed/drain, and if you have -6 water lines, buy a -6 union or bulkhead to loop the two, and throw a filter on the end of your hot charge pipe. I've heard bad things about trying to run an intercooler on a naturally aspirated car (bad like it doesn't make a lotta power), but haven't actually tried it. It's fine for driving around, not a full track day I would think. My friends charge pipe recently blew off on the dyno. Made 110hp, later made 510hp through the same setup.

sixshooter

iTrader: (12)

I love it when you talk dirty

curly

iTrader: (25)

Don't get me started on blow off valves.

sshamrockk

I did add in "his car/his setup" "test yourself"

Most of us have had Intercooler pipes pop off, myself included, that probably being worst case scenario. I feel like if you aren't doing WOT pulls or redlining you'd most likely be in safe.