Need more go go

[AltecZX2]

yea you'll need a new valvetrain to SAFELY go over 7200

[pre98zetec]

Originally Posted by AltecZX2

yea you'll need a new valvetrain to SAFELY go over 7200

I think you mean't to say in your other post 7,000rpm instead of 8,000?

[mr_tw]

ya lets hope so

[AltecZX2]

no, i ment 8k, that zetec can rev that high assuming he gets a new valve train, but its been dyno proven that unless you rev 6500+ you will see no difference in 2.25 or 2.5in exhaust.

[pre98zetec]

i don't think a whole new valve train is in his budget, though.

[AltecZX2]

no, i was just explaining the difference in the 2 exhaust sizes

[pre98zetec]

ohh.. BTW.. why'd your old name get banned?

you do know, if you get banned and make a new name they will just ban your new one.. right?

[mr_tw]

assuming you do install a new valvetrain i still wouldent take the car past about 7250 or so otherwise your kinda running on borrowed time as far as your crank and rods are concerned, they really weren't designed with the idea of the car revving to 7500 or 8000

[AltecZX2]

Originally Posted by mr_tw

assuming you do install a new valvetrain i still wouldent take the car past about 7250 or so otherwise your kinda running on borrowed time as far as your crank and rods are concerned, they really weren't designed with the idea of the car revving to 7500 or 8000

Crank and rods will easily take 8000, its when you get to the 160+whp range that the rod bolts start to become an issue.

[mr_tw]

well i know that a small increase in rpm can cause a huge increase in the stresses on the reciprocating assembly, for example honda said when building the 2.0 in the S2000 the forces on the engine were double from 8000 to 9000 rpm, not to say that you need to make everything 2wice as strong to be able to manage it, but all engines will have a limit as to where they can rev before you get to pick hot metal bits off the asphalt that was once your engine, and in my personal opinion 8000 rpm is a little more than i would wanna rev a Zetec without some extensive work on the valvetrain and bottom end

[AltecZX2]

i know guys w/ chip and full bolt-ons reves 8k daily, doesnt make power that high but has does 8k for over a year. the car was already designed to take 7200 rather safely

[99 Neon R/T]

So I bought a cai but no real difference just the sound.Who in the general opinion makes the best udp for the Focus?I have an obx on my neon and couldnt be happier with it.

[mr_tw]

i'm not saying you can't, i was just saying that I personally wouldn't want to take a risk with something that my personal finances wouldent be able to replace

[AltecZX2]

I didn't say it was recomended.

[smugpuff]

Originally Posted by 99 Neon R/T

So I bought a cai but no real difference just the sound.Who in the general opinion makes the best udp for the Focus?I have an obx on my neon and couldnt be happier with it.

Focussport makes a nice one, as does Ford Racing. The bonus with the Ford one is you get a goddyear Gatorback fanbelt.