mp62 14lbs boost 1/4 mile
 

i have a moss motors mp62 kit
150mm overlay bottom pulley
62.5 s/c pulley (14 lbs of boost)
diy copy of tdr top fed intercool
mspnp, 255 pump, 550cc injectors blah blah fuckin blah in my 94 miata

what do you guys think ill run tonight at the dragstrip. it went 14.4 @ 94 before @ 8 lbs of boost.

im using 225/45/15 for tires and car weighs 2290 with my fat ass in it

14.2

Just run it and report back.

^ wah

wah?

I'm telling you to run your car and report back, and not a bench racer/ricer and guesstimate on the interwebz just to hype up your hopes and dreams only to shatter them later when you actually run your car.

Its whatever.

I think you'll run a 18.4 @ 67

lol

Seriously with that thread title I expected to see a time slip.

If you are going tonight then just STFU about it and post the slip when you are done. Then we can make fun of you for having a supercharger.

word, i will post results tomorrow. was just wondering what you guys with your infinite knowledge of boos thought i should be looking for in mph.
till then, thanks for the hard time lol

:rofl:

Depends on your power output, boost is arbitrary and gives us nothing to go off.

I'd assume 13's, which is respectable.

Lol I did a 14.5 @ 96 on shitty all seasons and 7 psi on my old m45. Compared to your run at 8 psi you might want to get a better tune/turbo if you care about quarter mile times.

Buys a miata for drag car...






...can't understand why herp derp.

Yeah, it didn't have shit for timing in it then. I'm hoping for a low 13 at about 103 or so

Herp derp, the car is an Autocross car. I'm just taking it to the drag strip for shits and grins.

I'll play.

14.05 @98 mph

soft compound or street tires? I would have assumed 8psi supercharged could go a little faster than 14.4 1/4mi

:laugh:


well? what were the results?

I always wonder what my car would do in the 1/4, but I'm too lazy to go spend a night at the drag strip with all the 'tards. =/

I'll play. I estimate somewhere between 12 seconds and 16 seconds. Of course it also depends how fast the tow truck can get your car out of there if you pop a your motor but thats besides the point :P

13.7 @ 101, but I get the feeling we're never going to get results.

best pass was
60' 1.938
330' 5.737
1/8 8.893
mph 77.67
1000 1.602
1/4 13.875
mph 99.11

That's not bad.

The MP62 looks to be tapped out since you didn't gain that much trap speed despite nearly doubling the pressure.

Good '60 too.

its got belt slip like shit aftger about 6200 rpm the runs i short shifter were the fastest, im gonna have to figure out a 6 rib setup cuz the 4 rib shit isnt cutting it

i was only 0.325 sec slow; not too shabby.

ahh the joys of supercharging

If he did not have belt slip I bet Pdexta would have nailed the ET and trap speed almost exactly.

but he didnt take into account how shitty SC setups are!

lol

Better carry a couple spare belts and a can of the "anti-slip" spray with you at all times.

I can't hate too much though. I kinda enjoyed the last MP62 setup I drove.

i got two spare belts :) that anti slip spray is a goddamned joke tho

Time for a cogged belt.

fixed

The moss kit uses a 4 rib still which is useless on a m62. The setup I made uses a 6 rib and at 14 psi with a barely tight belt no slip ever.

Dang, too late to the party but reading through this thread I was totally thinking 13.9ish

So my guess was going to be 13.9 BUT by "The Price is Right" rules I still lose...or did I win. Going over in price is the same as going under in 1/4 mile time estimate? I mean I WIN

then you would have won. but you didnt guess!

Considering you lose if you go faster than your index time in bracket racing, I would think if you choose too a fast time, you lose.

If that was the case, I would actually be the winner. If you go by Speed Channel's Pass Time rules, pdexta is the winner. At least I was closest on the MPH.

That is the thing about guessing times. The art is factoring in what is most likely to happen including conditions, and what is likely to go wrong.

Funny thing about tracks of any kind, problems have a way of floating to the top.

https://www.miataturbo.net/attachmen...ine=1370472303

say no to belt slip.

Fixed that for you:

Just think, if you really work hard to optimize your car and struggle to drop .5 seconds you will be only as fast as Troy's naturally aspirated car above.

if I zeroed out the alignment and changed to skinny wheels and blah blah blah it would be quicker in the quarter. its an autocross car man. I was just taking it out for shits and grins

laguna that is what I was planning on doing with the overlay pulley. I figured to cut a ring of .25 aluminum then weld it to the s/c pulley and have it machined for two more ribs also.

I actually just had the original overlay lathed for 3 more ribs (7th rib extra for belt adjustment purposes).

But if you want more overdrive then ring it up. I'd just get a smaller nose. I'm spinning like 14k at redline with my tired psycho coffee grinding 45 lol...

In other words, you're still slow?

I meant add a ring to the 62.5mm s/c pulley to make it wider then machine it (6 rib).

I see you are in Orlando. Eventually I would like to organize a Miatas at the dragstrip, just for kicks and giggles. There are some cars here in Florida that will lay it down.

Oh yea, well if you have junkyards hand, the buick riviera had several different diameter 6-rib nose polleys that are completely interchangeable with the jackson M45 and moss/brp M62. I forgot the measurements off the top of my head but it's actually a much nicer billet pulley than the steel JR stock on and the small one I use is the equivalent to a 10-11 psi setup on an M45 with overlay.

Good idea, thanks

I did the six rib setup. if anyone is trying to do this there is a place called pulleyboys.com and they have the s/c pulleys for whatever charger you have

Did your max psi change any? Your original psi looked a little lower than I've normally seen for your pulley ratio and was wondering if you had any belt slip. Unless you've added some flow mods somewhere?

yes I was getting a LOT of belt slip. so i threw everything out and have just the s/c and crank pulley with an autotensioner in between them. it looks like its makin over 17 lbs now.

I'm thinking about doing this, as it seems relatively straightforward. Almost like the overlay pulley was designed for 6 ribs, and they just aren't machined. BUT, I still have power steering, and would like to keep it. Does someone make a 6 rib power steering pulley?