Questions. 1.8 head gasket. pistons.

alexpav · Postby **alexpav** » Mon Jun 25, 2012 12:36 am

I felt like burning my car when it stopped moving! haha

Worst part is, I dont want to work on it! oh well.
Will be well worth the headf**k haha

Thnx for the advice!

alexpav · Postby **alexpav** » Mon Jun 25, 2012 1:02 am

Any advantages in using adjustable cam gears?

Postby **NitroDann** » Mon Jun 25, 2012 1:05 am

Not a whole lot with stock cams, will allow you to tune the torque curve to be broader or peakier and move it up and down the RPM a bit if you dont like the turbos delivery.

Dann

alexpav · Postby **alexpav** » Mon Jun 25, 2012 9:42 pm

I bought the pure performance rods and i am going to change the pistons, for what its worth i may as well...

Anyone used DURATEC pistons? or NPR Pistons?

Any recommendations?
Anyone have any unused pistons for sale?

Cheers
Alex

alexpav · Postby **alexpav** » Mon Jun 25, 2012 9:46 pm

Or anyone used HYPERTEC?

Sean · Postby **Sean** » Mon Jun 25, 2012 10:05 pm

US eBay is probably the cheapest place for decent pistons.

alexpav · Postby **alexpav** » Mon Jun 25, 2012 10:07 pm

is that the NPR ones? They are only 160 delivered!
And apparently made in Japan, From what I have read they make a fair bit of OEM stuff for new car...cant be too bad...can they?

What compression ratios should i be looking at for a turbo setup?

Cheers

Sean · Postby **Sean** » Mon Jun 25, 2012 10:23 pm

alexpav wrote:is that the NPR ones? They are only 160 delivered!
And apparently made in Japan, From what I have read they make a fair bit of OEM stuff for new car...cant be too bad...can they?

What compression ratios should i be looking at for a turbo setup?

Cheers

There are lots of worthy ones - I've never used or even held NPR ones...

I've used CP which were an excellent piece of gear, but are a bit more than NPR. Heaps of guys have used hypertech etc, if you're looking 200ish rwkw, any of them will be fine including NPR I guess.

In terms of comp ration, it depends on your plans. You could go lower comp if you want massive boost in the futre, but if you're sticking with the S15 T28 turbo, stock comp will be ideal, it'll also leave you without a hole off boost, not that it takes long for the little turbo to overcome the boost threshold/lag point...

At the sort of boost you'll be running with that turbo, rods and more specifically rod bolts will be your biggest issue - Also, get your block checked before you go buying a piston set, just to make sure you don't want/need to go a little over sized.

alexpav · Postby **alexpav** » Mon Jun 25, 2012 10:43 pm

I think il b using the T25 will come on quicker from my experience with 200s/180s.....

Whats considered low/high comp?

I have bought pure perfomance rods with arp studs...

Sean · Postby **Sean** » Tue Jun 26, 2012 12:09 am

alexpav wrote:I think il b using the T25 will come on quicker from my experience with 200s/180s.....

Whats considered low/high comp?

I have bought pure perfomance rods with arp studs...

Go the T28 - trust me, they are fine on a 1.6 and the s15 turbo is almost identical to what is used on the factory turbo 1.8 SP model. It's more than quick to spool on a 1.8 mx5.

Low/high depends on the person. from memory different MX5 engines ranged from 9 to 9.5 to 10:1 compression ratios, in my opinion 9.5 is pretty nice for 15-16 psi on the t28 (assuming no major head or cam changes).

alexpav · Postby **alexpav** » Tue Jun 26, 2012 12:19 am

no head work or cams (yet)

hmmm got me thinking now...
Really i was only selling the t28 to get the cash! haha...

alexpav · Postby **alexpav** » Wed Jul 04, 2012 9:33 pm

Helllo again!
ok im running the T25
I got the rods/arp studs.

Its an NA8.

Im not sure what compression ratios i should be looking at.....

Which pistons should i run? Any suggestions??

There are so many on the market at so many different prices?

Your experience/suggestions would be appreciated.

Thanks again
Alex