How far would you take a c15-60 on stock internals?
 

Hi all,

As the title says: How far would you feel safe to push a c15-60 Rotrex with an I/C, EV14s and a Megasquirt in a '99 1.8? Tq, hp, restrictor, pulley?

The car is a DD that sees occasional trackdays.

Thanks,
- Tom

probably 300rwhp since they make no torque.

A C15-60 needs no restrictor on a stock internals 1.8. Running all out you might get 220 whp. That would put your torque at 180ish. Still 50 ft lbs below what is considered safe to run on stock internals.

Thanks. Exactly what I had hoped :)

- Tom

lol @ no torque crew

Yeah, it's hilarious. It's also the only legal approach to get more than 20 % extra power in an MX-5 where I live.

- Tom

Where do you live? Finish filling out your information.

Denmark. We also pay some of the highest income taxes in the world and a 180 % registration tax on cars. Fuel is around 8.5 $/gal. So please forgive me for being a little touchy on the subject. The weather is also crap.

- Tom

The C15-60 has a max speed of 150,000 rpm. If you are using the stock 130mm crank pulley then you can run a very small pulley to max the boost on it. Go to miata.net and search "C15-60" to see a couple of builds that got 200 whp with bone stock BP-4W engines like you have. I've PMed CoralDoc there and he gave me a bunch of info. I'm not sure what rpm he is taking his 15-60 to but he is getting 9.6 psi and 207 whp.

I don't know if its an option for you, but the new Kraftwerks kit (add Megasquit and better injectors) (minus the standard injectors and band aid BS) and a substituted C15-60 for the regular C30-74 ought to be a great solution. The intercooler set up is nice and lightweight and should be absolutely fine at 200 whp.

..... 180%? so, if I am to understand correctly... I buy a $10,000 car, and I owe the gov't $18,000?

Yes. But only the first time it is registered in the country. If you pick up a brand new car from a dealership, it costs 2.8 times what it would in most other countries. If you import a used car from a different country, the registration tax is calculated based on similar used cars already registered/taxed in Denmark.

There are no loopholes and attempts to cheat the system by not registering, or driving a foreign registered car (as a Danish resident), are heavily fined and you are forced to pay the registration tax.

If you export a registered car, you can claim a tax refund based on the price of similar cars, so used cars keep a relative portion of their bloated value. For reference, I bought my 10AE in '09 for $20.5k.

It sucks. However, we get free education, including university, free healthcare, pretty good roads etc. etc. There is a reason why Danes repeatedly end up as no.1 in those "the happiest people in the world" surveys.

- Tom

Damn.

I got nearly free university too by maintaining good grades and applying for good grants. Free healthcare, not so much. Having to pay that much for cars would make me bring down the average happiness on the happiness surveys. I understand your touchiness.

/threadjack

My family pays for health care each year, high deductible plan, what I paid for my 01 miata when I got it in 07.