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Nine81's Silver Wiener Build

Nineeightyone

Autocross Champion
Location
Pennsylvania
Car(s)
20 CX5 19 GTI 10 MZ3
Over the weekend we made a big and weird change. 2020 Mazda CX-5 Grand Touring with GT Premium package, so it's got all sorts of fanciness that I've never seen before. Heated & cooled seats, heated steering wheel, power folding mirrors, power moonroof, and the snazzy lighting. 24.5k OTD with ~14,000mi on the clock, not too shabby IMO. It's funny because it drives unexpectedly nicely for being an SUV. NA 2.5 so not a ton of power, but it's fine for what we need; a support vehicle to continue doing fun car things.

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Nineeightyone

Autocross Champion
Location
Pennsylvania
Car(s)
20 CX5 19 GTI 10 MZ3
Installation was EZPZ, I'm not sure what other people were running into but this is a Schroth Rallye3 using the supplied hardware, no weird cutting/drilling required on the Corbeau RRX and Corbeau brackets. It looks like it would work fine with the stock seats as well, though I'm not sure how the shoulder belt spacing would be. The tail strap is bolted to the rear seatbelt receivers behind the driver's seat, which as far as I can tell is an approved mounting point. The outside lap belt is affixed using the same spot that the factory seatbelt resides (and run up through the trim), and then the inside is bolted to the same point as the receiver for the factory seatbelt.

The harness is FMVSS certified, and puts the lap belt in a far better position than the factory four door receiver with these seats, something that made me a little nervous since day one. I'll put a passengers' side belt in at some point as well, because I like symmetry. I've retained the factory seatbelts as well because there's definitely a limitation to how thicc of a human will fit in these safely.

I will say there was definitely an order of operations here -- I had to run the harness through each of the seat holes from the back, then install the outside lap belt connection (using vise grips to keep the belt from retracting excessively). Once that was in place I disconnected the tail strap from the shoulder belts and unbolted the seat, allowing me to rotate it sideways and access the seatbelt receiver so that I could install the inside lap belt. Once those were in place I removed the rear seat cushion and fastener for the rear seatbelt receiver, bent the tailstrap bracket to ~80° near the larger hole to allow it to sit correctly, and then installed it and reinstalled the fastening hardware. From what I could find online, it seems the fasteners are all torqued to 30 ft-lbs, and to the best of my knowledge everything is secured and will hopefully never need to be tested.

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19birel

Autocross Champion
Location
Pittsburgh
Car(s)
MK7.5 - MK4 - B8.5
I like this, if it's tech compliant at HPDE I'm putting that my list
 

Nineeightyone

Autocross Champion
Location
Pennsylvania
Car(s)
20 CX5 19 GTI 10 MZ3
I like this, if it's tech compliant at HPDE I'm putting that my list
While it's got FMVSS certification, I don't know if it's HPDE compliant. Definitely something to ask about beforehand. I know for AX our local club is fine with them, but I've not run any HPDEs.
 

19birel

Autocross Champion
Location
Pittsburgh
Car(s)
MK7.5 - MK4 - B8.5
While it's got FMVSS certification, I don't know if it's HPDE compliant. Definitely something to ask about beforehand. I know for AX our local club is fine with them, but I've not run any HPDEs.
Just occurred to me that it was 3 point and HPDE usually requires 5 :p Still a neat piece of kit though!
 

Nineeightyone

Autocross Champion
Location
Pennsylvania
Car(s)
20 CX5 19 GTI 10 MZ3
Just occurred to me that it was 3 point and HPDE usually requires 5 :p Still a neat piece of kit though!
Ah, yeah that could be an issue then. I believe the Quickfit Pro is what other folks were running, BUT there was some uncertainty about that being usable with bolt fitment/needing to modify the hardware, which is ultimately what steered me away from a more aggressive solution of that nature. I've also heard that the bolt-in harness bars aren't a great idea, so the Rallye3 was my move. Thanks! I like it for what I want/need, which ultimately is to not get my thighs broken by a poorly landing stock lap belt with the aftermarket seats installed.
 

19birel

Autocross Champion
Location
Pittsburgh
Car(s)
MK7.5 - MK4 - B8.5
welp we've come full circle, starting to consider MPI for E85 and valve cleaning purposes again. Not immediate as there are other things to address, but it's definitely a beneficial mod. E85 + IS38 just sounds like a fun time.
I've had the same thought haha- valve cleaning was actually how I justified meth injection on my A4 lol (obviously the meth is less effective but still helps)
 

Nineeightyone

Autocross Champion
Location
Pennsylvania
Car(s)
20 CX5 19 GTI 10 MZ3
I've had the same thought haha- valve cleaning was actually how I justified meth injection on my A4 lol (obviously the meth is less effective but still helps)
Yeah, it's hard because there's just so much that I want to accomplish in general, and all of it individually seems accessible until I try to do all of it at once. But MPI seems sensible to keep everything happy.
 

19birel

Autocross Champion
Location
Pittsburgh
Car(s)
MK7.5 - MK4 - B8.5
Yeah, it's hard because there's just so much that I want to accomplish in general, and all of it individually seems accessible until I try to do all of it at once. But MPI seems sensible to keep everything happy.
I feel yeah there, the numbers add up fast haha It starts turning into a balancing act of mod priorities 😅
 

Nineeightyone

Autocross Champion
Location
Pennsylvania
Car(s)
20 CX5 19 GTI 10 MZ3
Sounds like there is a nice horror story that will make me stop keeping an eye out for a used HPFP haha
TBH it's more that there's just so much that could potentially go wrong in the installation process that scares me enough to go with the easier solution. I've done manifolds before, I've done LPFPs before, so MPI isn't extraordinarily new ground. And the added benefit of a little valve cleaning just makes it better.
 
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