2.0 duratec in search of low end torque

bigboredave · Feb 22, 2009

I have a 05 zx4 atx with the 2.0 duratec and want more low end power. I have a cosworth cai & focusport tuner with a 92 oct. tune on the car now. I cant afford a turbocharger setup or a 347 swap.

Are there any cams that increase the lowend torque that would work or exhaust parts (catback). I am to make the car a little quicker off the line & better during daily driving up large hills. I'm guessing 10-20ft/lbs would be good.

f2focus · Feb 22, 2009

The only other thing that would be a bolt on without opening the engine is a header! A lot of people have the F2 header and it works great....

http://www.f2usa.com/index.php?main_page=product_info&cPath=1_2_11&products_id=225

iceguyb14 · Feb 22, 2009

header hurts low end torque though doesnt it? helps upper end more..

daveyboy · Feb 23, 2009

iceguyb14 said:
header hurts low end torque though doesnt it? helps upper end more..

It depends on the size of the primary tube and length of the collector. Generally speaking the larger the primary tube the higher RPM which peak torque occurs. Also a longer collector can increase low end torque. So depending on header design headers can build low end torque or they can hurt it.

A header can be used as a great tuning device

iceguyb14 · Feb 23, 2009

but specifically the f2 header doesnt that hurt low end power? thats what ive heard.. it has more top end, but low end suffers..

only_in_a_domestic · Feb 23, 2009

on an auto i would do an intake, tb, tune and udp.... and a lower mount maybe

daveyboy · Feb 23, 2009

iceguyb14 said:
but specifically the f2 header doesnt that hurt low end power? thats what ive heard.. it has more top end, but low end suffers..

From what ive read the F2 and the OBX have 1 3/4" primarys and the focussport and the cosworth have 1 7/8" headers. So the F2 probably would be a good choise for the 2.0L. Still I think 1 3/4" is a bit big for a 2.0L.

Cameroon · Feb 24, 2009

The F2 header should give gains across the rev band, there will just be larger gains as the RPM's climb.

brads03zx3 · Feb 24, 2009

The F2 header actually chops a small amount off the bottom of the rev band and moves it up top. The benefits far outweigh the drawbacks, but if you are in search of low end, the F2 header is not the way to go. A turbo or shorter final drive is the way to go. I'm pretty sure the MTX gears won't work though.

Z63R · Feb 24, 2009

^ True that.

No one offers a torque-enhancing header primary dia; the only headers available for the Duratec are for making power at elevated revs.

If you're looking for over 10 lb ft, you won't find it in any bolt-on other than forced induction. A pair of the smallest grind cams MIGHT give you 10 lb ft, but that's at 3000 rpm and above... and I get the impression you're looking for more grunt off idle.

The 2.3 Duratec is what you're looking for if you want a torquey four banger. Consider selling your '05 ZX4 and getting into a ZX4 ST. The ST not only offers you the 2.3 but also the shorter 3.82 axle... win/win.

wesvdell · Feb 24, 2009

Anyone try the F2 cylinder head?? To me, this seems like the best way to go if you want to stay NA, plus you get to choose what stage cams to put in it. This plus intake and header would be about half the cost of the turbo kits out there and give you quite a bit more umph than stock. Looks like the best NA option for the 2.0!

wesvdell · Feb 24, 2009

Whoops, link here: http://www.f2usa.com/index.php?main_page=product_info&cPath=1_2_184_92&products_id=271

ClintB#1 · Feb 24, 2009

you could always go the turbo kit route and order a small GT25's series turbo for maximum spool response

04pzevingermany · Mar 2, 2009

You want low end torque? Get a 2.3.

iceguyb14 · Mar 2, 2009

clint the gt28r that comes witht he FS kit has amazing spool response already

ClintB#1 · Mar 2, 2009

iceguyb14 said:
clint the gt28r that comes witht he FS kit has amazing spool response already

i know it does, im just saying if the guy wants N/A like torque of idel, a smaller GT25 turbo will do the trick

Z63R · Mar 2, 2009

if the guy wants N/A-like torque off idle, a smaller GT25 turbo will do the trick

Mos def what I'd do... if I towed a small trailer... which I plan to do...

ClintB#1 · Mar 2, 2009

most all OEM turbo cars have turbo nealry undersized for the motor for the instant response and usable torque for the part of the power band people will use most on the street...low to mid range. so a 2.0 duratec with a big frame GT25 will have awesome response and low end

2.0 duratec in search of low end torque

bigboredave

f2focus

iceguyb14

daveyboy

iceguyb14

only_in_a_domestic

daveyboy

Cameroon

brads03zx3

Z63R

wesvdell

wesvdell

ClintB#1

04pzevingermany

iceguyb14

ClintB#1

Z63R

ClintB#1

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