Agent

iTrader: (2)

I had an incline to see what kind of power I was making so I called in a favor and a shop was opened on Sunday to do a little testing.

Baseline run was 187rwhp on the dynojet and after a bit of tuning we got 207rwhp and 179ft/lbs.

MP62 is right around 11psi until 7k and then it jumps. Engine is managed by MSPNP and I have an Air/Air intercooler mounted. Without this, I would probably be around 13psi. 126mm crank and 65mm nose pulley. 6-rib w/ autotensioner...

I really want some more power, I would like to hit mid 220's with the blower.

I was hoping some people here would be able to advise me on what I can do to upgrade this setup. I don't want to up the boost because of reliability, and I am hoping that I can maybe tune the other 15hp out of the car. Right now, I have the stock exhaust with a pounded out car, but I did cut off the original muffler and weld in a magnaflow... However, the rest of the piping is stock besides the JR header.

Let's hear some thoughts. I present to you, a bored fat guy yesterday: Carl's Supercharged 1.8l Mazda Miata on the Dyno Video by Carl - MySpace Video

patsmx5

iTrader: (16)

Badass header to good sized exhaust (2.5"). And water/meth injection. Then dial in more boost. Or do a two stage water injection setup, with a small pre-blower setup for increased compressor reliabiltiy and improved efficiency.

Agent

iTrader: (2)

So even with the intercooler you are thinking I should have water injection as well?

patsmx5

iTrader: (16)

Personally, I'd just change pullies and run more boost. But you said you didn't want to do that. So I suggested other means by which to extract a bit more HP through tuning. Nothing wrong with WI though. It will allow you to get a bit more aggressive with the timing and give you a larger safety margin as well. Post up your timing map you're running now.

Agent

iTrader: (2)

I guess I should just swap the pulleys and then lower the redline to compensate...

patsmx5

iTrader: (16)

What's the snout speed now? And what will it be if you go up a size on the pulley ratio? I'd keep a 7K redline and use Wi to keep the blower cool. It doesn't like higher RPMs, but keeping it cool helps, and you're not ALWAYS turning it that fast either.

paul

iTrader: (21)

tsk tsk tsk

patsmx5

iTrader: (16)

Hey, I finally came around. Turbo FTW.

Braineack

iTrader: (62)

nice supercharger, wanna race

m2cupcar

iTrader: (5)

One guess what you'll want once you have 220hp with the blower. And there's more than one right answer.

Agent

iTrader: (2)

Well, the car is for autocrossing, which is sort of why I went with the blower. I need a really linear power band. I can't imagine that once I get 220 (maybe a 12sec 1/4) that any more power would really help get around an autocross course...

The car only has 76k on it, and when I do the timing belt/water pump this summer, I'm going to raise the boost to get that last little bit out of it. My goal is somewhere in high high 220's or low 230's. If for some reason I want more, I think I'll grab an ls6.

Absolutely. As long as the track isn't straight!

Toddcod

iTrader: (8)

I personally wouldn't want advise from here for a S/C setup............Their ADVICE is turbo it.

Anyway, I wouldn't want to up boost and lower my rpm range. You main power is in the upper rpms. I may be wronge but wouldn't you kinda be going agaist yourself buy lowereing rpms and upping boost. In a since, you are not giving the motor full potenital.

You are already at 207, put a header and call TDR (Track dog racing) He has 300hp M62 1.8L miata. He knows what it takes!

I think If you have the right injectors, put a header, and the right size exhaust you can acheive 220-230 hp on 11psi, if you are getting 13psi mabe 250hp.

Braineack

iTrader: (62)

do you have a printout of your dyno? It looks like your torque drops off towards redline, more so than I think it should...

m2cupcar

iTrader: (5)

Ignore the "go turbo" talk, because there's loads of good tuning advice here. My answer was "more power" anyway. But then maybe you're different, you are supercharged after all.

levnubhin

iTrader: (30)

Send a PM to Soflarick, he dosent come on much but before he realized Turbo was the way to go he got 250 rwhp with the MP62 on his built 1.9L.
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Miatamaniac92

+1, Gary can help you get some more power.

Chris

Chris Swearingen

iTrader: (1)

Can I get some of that autocross action as well?

Ultimately, spinning the blower faster (up to a point) is the cheapest way to make more power. There are some things you can do like a bigger throttle body, and 3" exhaust to help you blower breath better. That will raise your CFM and HP without changing the pulleys. You can build the bottom end, install oversized valves, get things balanced, buy an ATI damper ( but that will change your bottom pulley to 144mm) Switch to larger injectors and e-85. There are lots of paths. My suggestion: DO THEM ALL!

On my car, I spend most of an autocross between 4 and 6K rpm. Tune for the best power in that range.

johnwag

iTrader: (3)

What size injectors are you running? Are you maxing out the current injectors?

You need to upgrade your exhaust and cat.

TravisR

iTrader: (9)

1. Buy a larger intake cam and cam gears so you can degree it so that overlap is only slightly larger then stock, but its open duration progresses much farther into the compression stroke. You will not get reversion until the pressure in the cylinder overcomes the pressure in the runner. So this is free area under the curve you can exploit to pack the cylinders.

2.) Exhaust

3.) Buy my intake manifold without the ITB throttles when it gets done (1-2 months) (heh plugs I love em) Less induction losses more power.

4.) Buy a header specially made for superchargers.

EvoRoadster

iTrader: (1)

OK, just say when.