building a new turbo engine

spikey · Postby **spikey** » Fri Jul 18, 2008 7:15 pm

I'm going to start an engine build,the first one I did not really know much about the B6 engine,I just got a set of new factory B6 turbo pistons,then just got the heads reconditioned,put a turbo kit on it and it seems to be holding up pretty well on 15psi making 230hpatw.
This time I want to build something stronger,got a B6 turbo head and B6t turbo engine,so need some advice what and where to buy the pistons,rods,what cams to use,if you have done this project before let me know what you have found useful,it would save a lot of time and money to do it right the first time.
Thanks
Terry

SuperMazdaKart · Postby **SuperMazdaKart** » Fri Jul 18, 2008 7:44 pm

230hpatw?!

woah well done. & you need more?

is the B6T engine you got missing the pistons/rods/cams it came with?

spikey · Postby **spikey** » Fri Jul 18, 2008 8:08 pm

The engine got pistons and rods, but I might need oversize pistons if they need to be machined.

Mr Morlock · Postby **Mr Morlock** » Fri Jul 18, 2008 8:13 pm

If you are producing around 173KW which I guess might be double a standard car ( at the rear wheels) what are you trying to achieve? Is it the engine that is the weak link or other components such as gearboxes clutches uni joints etc.

spikey · Postby **spikey** » Fri Jul 18, 2008 8:48 pm

I just wanted a spare engine just incase something happens to this one ,it still has the standard rods,aren't they a weak point?I have the clutch to handle the power, Nb clutch pack diff, rx7 brakes all round,basically something to do.

Postby **mx52nv** » Sat Jul 19, 2008 12:04 am

Spikey,
My B6T stock bottom end has lasted 6 years on 1bar or 14.5psi daily tune.
For autokhana/sprints/track days, I have used another fuel map and turned it up to 1.4 bar or 20 psi.

It is still going strong. If you have a spare B6T bottom end, keep it as is. They're getting a bit harder to come by. I have my doubts that the trouble of using a GTX/GTR turbo head is worth the hassle as most of your GReddy kit won't fit.

My 2 cents.
Les

spikey · Postby **spikey** » Sat Jul 19, 2008 2:58 am

Hi Les,
How are you going?hope everything is well,The b6t heads off the 323 turbo do the mx5 manifolds fit onto them?maybe I will just keep the block until something happens with the other motor,you just saved me some money

Thanks

Postby **mx52nv** » Sat Jul 19, 2008 3:21 am

Mate,
Yeah I'm doing alright

I don't think your GReddy turbo manifold will fit the GTX/GTR head without modifications.

And yes save your money - fuel is getting ridiculous these days :evil:

spikey · Postby **spikey** » Sat Jul 19, 2008 11:22 am

I'm still tossing up which cams to use ,I have the turbo cams off the b6t with 7.9mm lift ,Maruha Na cams 8.5mm lift or my current b6 Na cams that I'm running,which one do you think I should run in my car?

Postby **mx52nv** » Sun Jul 20, 2008 6:11 am

Is the reason for the aftermarket cams to shift the powerband further up? I thought that with your GReddy kit & the TD05, full boost would already by pretty far up the rev range say 4000rpm or so? So really... unless you are chasing more power higher up in the rev range, I can't really see the benefits.

Stick to stock.

My 2 cents.

spikey · Postby **spikey** » Sun Jul 20, 2008 2:27 pm

stock na or stock turbo cams?

Sean · Postby **Sean** » Sun Jul 20, 2008 7:18 pm

spikey wrote:stock na or stock turbo cams?

Intake is the same cam, only the exhaust cams are different.

Ehaust cam from turbo will help bring boost on a tad sooner.

My recommendation - stock B6T bottom end, cometic gasket, MX5 head.