Budget Eaton Build
#1
Budget Eaton Build
So I have a '94 Miata, and I have an Eaton 62 series supercharger off an old Oldsmobile sitting on the shelf. Guess what's going to happen next? (If that wasn't an invite to flame away, I don't know what is).
I'm planning on a hotside system that blows through the stock TB. At least on the first attempt.
The goal is around 200ish RWHP.
The first stumbling block is pulley sizing. I need to know how fast to turn this thing. In it's native environment on the 3.8l engine, it was turning approximately 2.5 times crank speed and making about 9 psi. I would like some real world #'s on pulley sizing and boost for a 62 charger on the Mazda 1.8l engine. From what I have read on various forums it looks like it probably needs to spin somewhere around 1.8 - 2 times crank speed. I can't start to make the brackets until I know where to locate the SC, it all seems to start with bolting on a crank pulley and getting the belt straight to mock things up.
Also, does anyone know a good place to buy a crank pulley? This will be a 6 rib serpentine belt drive with an auto tensioner. Flyin Miata?
Same goes for the auto tensioner. I want an off the shelf unit used on a production car. Any pointers here?
Other than these two items I believe I can make the rest from scratch.
I'm planning on a hotside system that blows through the stock TB. At least on the first attempt.
The goal is around 200ish RWHP.
The first stumbling block is pulley sizing. I need to know how fast to turn this thing. In it's native environment on the 3.8l engine, it was turning approximately 2.5 times crank speed and making about 9 psi. I would like some real world #'s on pulley sizing and boost for a 62 charger on the Mazda 1.8l engine. From what I have read on various forums it looks like it probably needs to spin somewhere around 1.8 - 2 times crank speed. I can't start to make the brackets until I know where to locate the SC, it all seems to start with bolting on a crank pulley and getting the belt straight to mock things up.
Also, does anyone know a good place to buy a crank pulley? This will be a 6 rib serpentine belt drive with an auto tensioner. Flyin Miata?
Same goes for the auto tensioner. I want an off the shelf unit used on a production car. Any pointers here?
Other than these two items I believe I can make the rest from scratch.
#4
95mm Crank pulley
65mm Supercharger pulley
On my MP62 yields 5.5psi max with no intercooler.
With TB in the stock position and not on the charger inlet it's gonna get loud under there.
Flyin Miata now carries the old BRP / Stage One Tuning superchargers. They should have pulleys, tensioners etc.
65mm Supercharger pulley
On my MP62 yields 5.5psi max with no intercooler.
With TB in the stock position and not on the charger inlet it's gonna get loud under there.
Flyin Miata now carries the old BRP / Stage One Tuning superchargers. They should have pulleys, tensioners etc.
#5
No dual throttles at first. I may add that if it seems necessary. I'm not sure how fast the factory SC bypass opens, but I'm thinking I may need a BOV. An intercooler may be on the list down the road also.
jeff_man, what pulleys are you running to achieve 9psi?
And please, anyone that chimes in with a MP62, give your pulley ratio and boost achieved.
jeff_man, what pulleys are you running to achieve 9psi?
And please, anyone that chimes in with a MP62, give your pulley ratio and boost achieved.
#7
Also, does anyone know a good place to buy a crank pulley? This will be a 6 rib serpentine belt drive with an auto tensioner. Flyin Miata?
Same goes for the auto tensioner. I want an off the shelf unit used on a production car. Any pointers here?
Other than these two items I believe I can make the rest from scratch.
Same goes for the auto tensioner. I want an off the shelf unit used on a production car. Any pointers here?
Other than these two items I believe I can make the rest from scratch.
If you can build everything from scratch, no reason you can't build a bracket for any OEM style belt tensioner too. Go to SummitRacing and search for "Hayden Tensioner". Tons of styles. I haven't been able to confirm, but I'm 95% sure the one used by SOT is the Hayden model 5547. I searched every other pic, and none of the rest looked even close.
Sorry, forgot to add:
115mm Crank pulley
65mm Supercharger pulley
Approx 10psi once above 5k rpm.
#9
So far it's looking more or less like-
1.5 : 1 gets you about 5-6 psi
2 : 1 gets you about 10-12 psi
The factory GM pulley on my charger is 72mm. I'd like to keep this if possible for the greater belt contact surface. Plus it's paid for. So I guess I'm in the market for a 130 or 150mm crank pulley. Preferably 150mm, which will turn it almost exactly 2 : 1.
RunninOnEmpty- Thanks for the pointer on the tensioner. Yes, I'll make the bracket. But there is no need to build *everything*. The spring loaded arm and pulley I will buy, just want a nice easy to fit piece.
Begi's coldside setup mentions something about a F350 truck unit?
1.5 : 1 gets you about 5-6 psi
2 : 1 gets you about 10-12 psi
The factory GM pulley on my charger is 72mm. I'd like to keep this if possible for the greater belt contact surface. Plus it's paid for. So I guess I'm in the market for a 130 or 150mm crank pulley. Preferably 150mm, which will turn it almost exactly 2 : 1.
RunninOnEmpty- Thanks for the pointer on the tensioner. Yes, I'll make the bracket. But there is no need to build *everything*. The spring loaded arm and pulley I will buy, just want a nice easy to fit piece.
Begi's coldside setup mentions something about a F350 truck unit?
#10
They are the latest company using MP62s and have the latest design. I'm sure you could use almost anything since you're homebrewing it.
Maybe this will help you, maybe not:
http://www.cardomain.com/ride/2667914/5
Look for member 924_nick on M.net
Maybe this will help you, maybe not:
http://www.cardomain.com/ride/2667914/5
Look for member 924_nick on M.net
#16
Also, take a look at this table if you haven't yet.
http://www.trackdogracing.com/websit...lley_chart.htm
http://www.trackdogracing.com/websit...lley_chart.htm
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