Turbo Upgrade

[MrBean]

Hey Ninka,

No problem Buddy

As a matter of fact, I doubt the rods would be reliable at those levels, depending the rev-range and power available at those revs - if we make to much of our power down in the rpm band, of course the relative torque available at those levels will be much higher if we made that same power a few k rpm higher.

So, depending on the tuner, and how they allow boost to come on, and where you make power, will depend how reliable the setup is.

If we make 385rwkw at 6200 rpm, the engine may just survive, if we make the same kw at 3500, it definately won't - due to torque developed and force exerted on the reciprocating/rotating assembly - which conrods do both of....

Anyway, to be safe I will do the same as you, day-to-day of around 340-350rwkw, only extreme cases go up to 385rwkw - and only if you are sure this little extra may give you a win - otherwise it would not be worth the risk.

At the end of the day, to be completely honest, I had a chat to Dave at Nizpro, will go for the Stage2+Extra, but will assemble my own spare bulletproof sub-assembly, as I am not comfy with those levels and stock rods.

They are extremely long rods, undersquare engine setup, and will definately be the weakpoint in the bottom end.

I may have a chat to Simon to sell me a set of rods and pistons, which I doubt they will do, real secretive, not even willing to share any information like piston-to-wall clearances etc, but ultimately people need to realize it is really those little things you don't see, which makes the differences.

They can keep their piston barrell design secret, I just need to know clearances to install these pistons - even if competitors know the clearances, they do not have the piston design, so it won't help them....

But, to each his own, I will do this upgrade for now, and assemble my own bottom end, even if I have to contact JE in the states to do custom pistons, and then order rods from the USA too, maybe Manleys or Carillos or some good quality H-Beam rod.

At least some ideas for the future, and the reason I want to go down this route is cost.

Manhours are really expensive in this country, and I am not willing to buy something worth $10k, but end up spending $18k just cause it comes pre-assembled etc.

I will blueprint my own setup, for machining I will find a high-quality shop, same as what most of these suppliers do, and it should probably cost me 35-40% less at the end of the day.

So yes, if they're willing to sell me a set of pistons and rods, good, if not, no train smash. I know what I want, and I will get it ultimately - one thing we need to realize they run a business, and they cannot spend the time assembling an engine they way I would like them to, maybe they can, but at huge cost.

So, given, I have so much to learn about this 4L DOHC engine, my forte is 351 Windor-based Ford V8's, but, it is just another engine, and the mechanicals I will take care of - eventually.

After all, I would still use Nizpro's knowledge in tuning this setup for me, as they are most likely some of the best wrt this specific engine.

Will keep you guys posted, and start a thread once I get to that point. First need to find a proper seasoned block, something with 80-120k on the clock, and then do sonic testing to find a unit with minimal coreshift, decent uniform cylinder sleeves, etc.

Soz for off-topic, just can't seem to stop talking once I start :(

Edited 25/01/07 04:44 AM by MrBean

[quigebo]

This should bring me up to an average rating of peak 385rwkw, and the reason I can get to this levels without to much fuss lies in the fact that the BF F6 bottom end (read conrods) are substantially beefier than the stock BA XR6T units.

Keep us posted.

Kind regards,

Beanie.

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Beanie,

I don't want to start an argument here, but do you really think the BF rods are 100% safe at 385rwkw?

I seem to remember that the rods are no stronger than F6 rods, and some of those have broken or bent at less power than 385rwkw.

I'm interested in you thoughts on this, as I have the full Nizpro kit, and 2 x 2 1/2" quad tip exhaust, with SMB 4" dump and 5" cat, and I decided to upgrade my rods, but still have stock pistons, and running about 345rwkw.

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ninka..

my bf xr6t has f6 rods and I had around 360-370rwkw.. when simon pulled them out they where in great shape... but I havent done a lot of km's with them:)

[Billsta]

I've got 384rwkw with stock bottom end in my BF F6 with the ZF and all is coping well.

Like Mr Beanie, mentioned alot goes in the way it's been tuned and when the boost comes on, most shops are about delivering safe reliable power, though consulting the guy tuning the car and sharing your thoughts and telling them what you want makes a big difference.

I found with my car that my top end has improved massivley from previous (308rwkw). Though the midrange has been immensely improved I don't think from the way the car feels that I'm doing it too much harm, though there's much unkown at the moment just hoping we aren't the first to start breaking things or else it's going to get very very expensive.

Personal opinion and speaking to a few tuners in sydney everyones talking 380rwkw should be the limit but can't be too bad getting 400 could it......