JoshP5

Mine came with a free tissue.

Shasta

I average 600 + km's per tank.

_Kansei_

that's how it always was for me pre-turbo, and on a tank that is mostly city.

now I still get that highway, but I don't do nearly enough highway driving.

I need a quick-disconnect wastegate actuator so I can have boost when I want to, and none when I don't

JoshP5

I get about 530km/tank (I go deep into E before refueling). Mostly highway, mostly assertive, mostly traffic-y.

I used to get 35mpg at 90mph in the Miata. But that was at 8000ft on the Colorado Plateau. Altitude sucks power but does wonders for gas mileage.

TheDirtyGoatee

That is exactly why I love Atlanta GA. It is very low altitude so I can haul ***. Plus, I am gonna replace my stock turbo and get it tuned.

Quick question though. My wastegate broke so the whole turbo is crap. What would you guys do... replace it with stock and tune it, or get a bigger one that fits the stock application? Prices?

_Kansei_

What of the wastegate broke.. the actuator or the actual wastegate valve? If the actuator broke and you weren't careful you'd blow the engine because it would never open the valve. If something else broke, the wastegate could just be open.. meaning you'd never really have boost.

Either way it's just basically bolted onto the turbo so just because it broke doesn't mean the turbo is toast.

The stock turbo is a good unit (it's like 1000-1200 new from discount garrett dealers), and basically all there is in terms of an upgrade that fits the stock application is the Garrett GT28RS. The GT28R isn't dual ball bearing (GT25R is though.. that's the stock MSP turbo) so IMO that would be a downgrade though it is larger. Our engines don't flow enough to quickly push a larger turbo.. you'd have lag lag lag then OMG BOOOOOSTTTTTTTT!!!!

Either way though.. the stock turbo is more than enough to shoot a rod right through your block so an upgrade is pointless unless your turbo is totally dead and you can't find someone selling a good condition used unit.

JoshP5

Smaller turbo, less inertia, less lag. Can you get an even smaller turbo for the FSDE? Like, smaller than the GT25R? I hate turbo lag and don't care as much as your typical tuner about top end.

_Kansei_

the GT25R is the smallest dual ball bearing turbo made. There are smaller T25s to be had but they'd have more lag.

There's seriously barely any lag at all. Trust me, I'd hate it if it was laggy.

I dunno if this video helps visualize how it is.. the actual accelerating part doesn't come until 40 seconds or so into the vid though:
http://youtube.com/watch?v=1qMN9Rr6Xtc

this was in the 'related vids'.. wow I didn't realize automatic p5s were that slow, yikes!
http://youtube.com/watch?v=LzZ7upGPA1E

TheDirtyGoatee

Ok, well I knew the stock turbo could be tuned. All I know is that I was told the wastegate just stays open so I am making zero boost. I was also told that the because the wastegate is a part of the turbo, it must all be replaced.

Also, what would the benefits of a BoV be? Hinder, Help, or just add cool sound of hiss?

TheDirtyGoatee

I just watched that second video. To prove that my turbo is clearly not working, that's about the speed at which I go... ok maybe not that slow but I definately am not making turbo power to my wheels.

Also, as I asked in another part of this site, they didn't make an Automatic MSP did they? I was watching a video where some dude in an MSP killed an SRT-4 (the guy in the SRT was talking big **** about all his upgrades vs. this stock MSP). It was on streetfire.net and someone made the comment that the guy was driving an automatic Mazdaspeed so that's why he won. I didn't think they made them auto. (It was because the guy was so skilled he was smoking with one hand.) That also shows how horrible SRT-4's are.

_Kansei_

BOV - adds a cool sound (I find it annoying, and I have one), isn't emissions legal, etc

If it is just staying open it's probably just a dead actuator. ATP Turbo sells an MSP replacement 7psi wastegate that can fix that. It really depends on how it is dead. If something with the wastegate flapper is f-ed up, a new actuator won't help.. but the actuator is a very common thing to break on the MSP, so that's probably what it is.

It's also a $75 fix vs multiple thousands of dollars for a new turbo.

_Kansei_

Well, the SRT-4 is a very potent drag car.. like WAY, waaaaaaay faster than an MSP on stock internals.

You can spend 1k on an SRT-4 and make it so fast you would need to drop like 5000 on an MSP to get near that same level of performance. It's kinda sad, blame Mazda for using an ancient engine (but not good ancient like the Mitsu 4G63) in our cars. As for auto or not.. well I responded in that other thread but absolutely no automatic. There's no such thing as a Mazdaspeed car and if there ever is, I'll have to reconsider my brand loyalty.

TheDirtyGoatee

Yeah, if Mazdaspeed's ever turned soft and went auto, I'd go and sell mine I do believe. Thanks for reposting on both then.

Also, about the $75 fix. I appreciate that. However you said it is a replacement for the stock 7 psi. What happens if I decide to crank it up to say 10 psi or 12 psi? On top of that question, is there a tuned sweet spot for the stock GT25 or is the stock setting the best?

JoshP5

Watch out for flying engine components.

TheDirtyGoatee

You think that that kind of increase would seriously make the engine get tore up? My buddy (who is a VW guy anyhow) who works at a body shop was telling me that my engine could probably support 20 psi (though it would be highly not recommended). So you think 10 would blow 'er up? If so, what could I do to increase hp a bit? Cold air intake? Upgraded front mount intercooler?

I would like to get my MSP up to at least 230-240 hp. Is that going to be too costly for what it's worth or can that be done reasonably?