Are you making 400rwhp on that cute little thing?

 

No.

Does that change the fact that it will completely step sideways short shifting into second? Clean before 3800?

 

Yes, because your turbo's sized such that you can spool with lower mass airflow than a big turbo can. For autox you need to be able to make upper 300s rwhp or more. If you're only making 200-ish then you're running a little baby turbo that can spool at low 2000s RPMs.

 

I'm sure.

The turbo I have is capable of 250+, it is cheap chinese journal bearing ****.

 

 

That 400 motor looks cammed.

 

it aint. in fact, it's a bone stock junkyard head that wasn't even refreshed

 

Weird. Turbo torque curves on a Miata don't usually hold that late.

 

Boost control methods are many and varied.

 

Probably not, but I'd love to hear why I'm wrong. Custom cams with a stock bottom end? I could see it if OP wanted to run a small turbo and do headwork to keep torque up at the top end, but with a centrifugal SC that won't be a problem. C30-94 is the same price as the C30-74, so I don't understand why someone would do the 74 plus cams instead of just running the 94 with stock cams.

 

Because with properly setup cams you will pick up power EVERYWHERE on a supercharged car. I gained more HP and torque with cams than I gained going from a Eaton at 14 psi to a larger Whipple at 24.

 

Clearly I missed this SC vs. Turbo debate as I was busy getting my car setup and tuned. However I will chime in with my dyno plot and dick waving. This is a car that is built for autox and street driving. Likely to do track days soon after some more supporting mods (coolant reroute etc). I have an MP62 running on a stock 95 motor. Supporting mods include TDR intercooler, 72mm throttle body, MS, 130/62.5 pulleys, Jackson Racing Header, CAT delete, and full exhaust. Now I am not yet building the motor (though I have a spare for that purpose) but I have a fairly conservative safe tune and I am pleased with my results. I picked the kit up used for a reasonable price and have run with it. I originally planned to go turbo and I also see the advantages for both systems. I believe I am at about the limit for the stock engine and transmission and hope I don't find out. But it is good to have spares.

 

The limits on the engine and fuel system are lower with a blower than a turbo so you might be closer than you realise.

Dann

 

I gotta say: I'd be lying if I said I didn't at least somewhat enjoy driving my MP62 setup. The whole "big engine feeling" comment is pretty much spot on, that's what it felt like. However, the "sling shot" torque onset of a turbo is just as, if not slightly more fun.

All opinion obviously

 

I already have the fuel system taken care of. DW pump and 460 cc injectors. Not optimal but ID1000s will be budgeted into the motor build. Like I said I know I am right at the limit hence keeping tune conservative. This is by no means a daily driver and if I blow it up that only means forced upgrades!!!!

I am already starting to budget for engine build and have a spare 99 motor sitting in the garage for that purpose. And after the motor is built and I have the bigger injectors some higher boost and E85 might be happening. I wouldn't mind a relatively reliable 250+whp SC setup. (and no it isn't cheap to get there! but neither is doing a turbo set up properly)

 

<shamelessplug/>My SC setup is 400+rwhp capable, buy it now for 2500$! Also buy my ID1000s. ;-)

 

Yeap. Would be sweet if you could have both though! All the torque with the instant response.

 

If you need more torque, then you just need a bigger supercharger. From a roll, I was able to break the tires loose in 2nd on 275 A6s on anything other than a nice warm day on concrete.

 

The miata's here that trap 122, 126, and 132mph in the quarter mile all spin wrinkle-wall slicks halfway down the track

oh and their e-peens are bigger

 

That doesn't sound very streetable.