2.5" actually

The kit includes a larger throttle body that is mounted on the inlet side (rear) of the SC.

Comparison of the OEM TB and the new one:



You want to consider the amount of volume you are adding to the in-vacuum portion of the intake manifold as to large of a volume can create issues with tuning, off throttle droop, etc..

I am really impressed at how well and quickly the OEM ECU learns the new variables. After getting a little more street tuning/tweaking of the piggyback done it does drive very well. Just need to tweak it a little more to get the AF curve dialed in for optimal performance.

 

marking

 

Wow, thats nice, Any kind of whine from the S/C? or is it totally silent stealth mode?

 

o yeah, vids too haha.

 

Nice!

 

that seems like a lot of work, why not just stick with Vortech?

 

because vortec would be slower thats why

 

but the vortec makes more power?

I'm just wondering what are the pro's to this blower vs vortec?

 

not here to talk sh!t but I have to point out some potential issues with a kit like this....


1. the amount of factory parts need to be removed/modified. not very "bolt on" / "oem" install.
- a kit at this price range, produces only 100 or so hp? 7-8 psi? avg end users would expect something relatively easy to install. modifying the a/c lines are not easy and even performance / mechanic shops would hate to do that.
-then relocating the battery, about 30lbs worth of weight to the front, thus throwing off the weight distribution a bit.


2. the supercharger sits right on the hottest spot in the engine bay.
- #1 issue, hot soaking ? i can not see how this thing will run properly under 100 degree summer. how about track days under 120 degree summer?
- even worse, the filter is mounted right next to the header. imagine, HOT air goes in the already HOT S/C, then compressed, it gets even HOTTER, forced in the engine, it just gets hotter and hotter. a very bad cycle.
- reliability issue, the s/c unit will not last under such extreme temperature.
-a vented hood will possibily help though.

3. the way that the filter is mounted is....uh.. weird.
- this makes the kit look even worse, looks like someone pieced this together in his backyard or something.

Suggestions:

think about moving the S/C to the intake side instead. replace the intake manifold completely like the comptech S/C for fwd hondas.
- f20c intake mani is 1 piece, so a new lower intake mani must be made, then the blower sits on top... keeping the throttle at where factory is, the stock air box can be used still.

hope this helps

 

What is the rotation speed now and the max you're thinking about?
Keep in mind you can spin that MP62 reliably to about 18000 rpm. Beyond that it is getting dangerous, but there was a guy in Miataforum which was spinning it to 21000 rpm in his Miata and making around 340 whp.