DC Sports Header install and evaluation - Page 9 - Toyota Yaris Forums

TrYaris · 11-21-2012, 04:13 AM

Hey guys, What is the difference between 4-2-1 and 4-1, in performance I mean

xnamerxx · 11-21-2012, 10:23 AM

Depends on how they are designed, but if both are designed correctly there should be almost no difference.

tooter · 11-21-2012, 10:46 AM

Quote:

Originally Posted by xnamerxx

Depends on how they are designed, but if both are designed correctly there should be almost no difference.

The 1NZ FE engine's firing order is 1-3-4-2.

A 4-2-1 tri Y header pairs up sequentially firing cylinders 2-1 and 3-4 so that the exhaust pulse from one helps to draw exhaust from the other.

Then the combined 2-1 and 3-4 pairs join to help scavange each other...

Practically speaking, the headers are too short to make a lot of difference.

But that's where namer comes in...

1.5 · 11-21-2012, 12:08 PM

The 4-1 is supposed to delay the power increase until higher in the powerband. The 4-2-1 is supposed to give a midrange bump. On our tiny cars you probably would never notice a difference. I love my DC header. Anytime I'm above 4k I'm just roaring and pulling hard for a yaris lol.

tooter · 11-21-2012, 12:20 PM

I actually did notice a difference...
...as I climb a steep 1/4 mile hill in 2nd gear to get to my house. It's always the same hill, so that's constant. And driving up it everyday I have a good feeling for the resistance. The header definitely helped the engine make it up the hill easier. If you start climbing under 2,000 rpm, the engine labors sluggishly. But anything over 2,000 and it gains rpms much easier and climbs more easily than the stock header which feels like it's holding back at the same rpms.

cali yaris · 11-21-2012, 12:36 PM

^ An aftermarket header will certainly make a difference over stock, but I doubt you can feel any difference BETWEEN aftermarket headers. You just can't feel 1-2 horsepower, in my opinion.

cali yaris · 11-21-2012, 12:36 PM

TRYaris is that your car in your avatar?

xnamerxx · 11-21-2012, 01:32 PM

Basically what Cali said.

There is a maximum of about 12" to work with and an ideal length of about 35" so most of the ots headers compensate by increasing the volume of tube which in essence give some of the same effect as increasing length but reduces scavenging at lower rpms. Now this motor is relatively small displacement with a good torque management system going to a larger diameter tube won't hurt you as bad as it would on a larger engine.

So not wanting to give up anywhere in the powerband while still gaining some up top is the reason I decided to design and build my own header.

As far as header type is concerned both a 4-2-1 and a 4-1 will accomplish the same goal but each design has its own advantages but both of them can produce near the same power and torque so there isn't a real advantage to choosing either one aside from packaging constraints, and a 4-1 is simply easier to package with the effecting lengths required.

TrYaris · 11-21-2012, 02:05 PM

Quote:

Originally Posted by cali yaris

TRYaris is that your car in your avatar?

No it's not :P would be nice but I don't have that much money !

1.5 · 11-21-2012, 03:01 PM

Quote:

Originally Posted by cali yaris

^ An aftermarket header will certainly make a difference over stock, but I doubt you can feel any difference BETWEEN aftermarket headers. You just can't feel 1-2 horsepower, in my opinion.

This

Tr that pic I think is sporting a MI Hood visor.

TOLMACH · 12-01-2012, 09:20 PM

This is what I received yesterday
http://photo.qip.ru/users/tolmach/96608749/129617602/

Same part number but Dc logo seems to be on the fourth tube as compared to this one (stole this pic from someone here) - here logo is on the third tube

http://photo.qip.ru/users/tolmach/96608749/129617601/

have not tried installing it yet, but there seems to be enough space between the hole for the O2 sensor and top bracket

Overall build quality of mine is not very impressive (kinda very average) as compared to the WR one

tooter · 12-01-2012, 09:33 PM

That's one thing I really like about the Weapon R. It's precise. You could cut your finger on that sharp knife edge where the two main tubes are joined...

But as far as performance, it doesn't matter.

xnamerxx · 12-01-2012, 10:20 PM

That's not a good thing, air doesn't like sharp edges.

*tk-421* · 12-01-2012, 10:56 PM

I don't think it would make that much of a difference in our case either way.

Any aftermarket header should prove to be at least slightly better than stock, right?

xnamerxx · 12-01-2012, 11:07 PM

the slight knock it causes in flow won't make much of a difference.

tooter · 12-02-2012, 12:49 AM

Quote:

Originally Posted by xnamerxx

the slight knock it causes in flow won't make much of a difference.

... especially when its just a trailing edge with alternating pulses coming through each runner.

TOLMACH · 12-02-2012, 01:41 PM

Quote:

Originally Posted by tooter

That's one thing I really like about the Weapon R. It's precise. You could cut your finger on that sharp knife edge where the two main tubes are joined...

But as far as performance, it doesn't matter.

Mine looks nothing like this inside (build quality wise) ((

Hopefully, will still do its job

xnamerxx · 12-02-2012, 01:55 PM

I wouldn't worry, all of the aftermarket headers lack a ventur,i so the collector looking bad wol make almost no difference.

11-21-2012, 12:08 PM	#148
1.5 Form>Function Drives: 07 Flint Sedan Join Date: Dec 2009 Location: Tampa Posts: 4,018	The 4-1 is supposed to delay the power increase until higher in the powerband. The 4-2-1 is supposed to give a midrange bump. On our tiny cars you probably would never notice a difference. I love my DC header. Anytime I'm above 4k I'm just roaring and pulling hard for a yaris lol. __________________ Instagram: @southernstreets_phil Facebook.com/southernstreetsempire

11-21-2012, 12:36 PM	#150
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	^ An aftermarket header will certainly make a difference over stock, but I doubt you can feel any difference BETWEEN aftermarket headers. You just can't feel 1-2 horsepower, in my opinion. __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

11-21-2012, 12:36 PM	#151
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	TRYaris is that your car in your avatar? __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

12-01-2012, 10:56 PM	#158
tk-421 Super Moderator View User's Garage Drives: 5D-07-LB Join Date: Jan 2007 Location: Dagobah Posts: 4,263	I don't think it would make that much of a difference in our case either way. Any aftermarket header should prove to be at least slightly better than stock, right? __________________ --[ FORUM RULES ]--[ SEARCHING TIPS ]--[ EYELIDS PICS ]--[ RBK SPOILER ]--[ BEST/WORST INVESTMENTS ]-- Last edited by tk-421; 12-02-2012 at 12:47 AM.

11-21-2012, 04:13 AM	#145
TrYaris Drives: Racin' yaris :D Join Date: Nov 2012 Location: Trois-Rivières, Qc Posts: 86	Hey guys, What is the difference between 4-2-1 and 4-1, in performance I mean

11-21-2012, 10:23 AM	#146
xnamerxx 0-60 in slow Drives: light blue liftback Join Date: Aug 2009 Location: so cal Posts: 926	Depends on how they are designed, but if both are designed correctly there should be almost no difference.

11-21-2012, 12:20 PM	#149
tooter play every day Drives: 2012 Yaris L 2dr 5sp Join Date: Apr 2012 Location: Los Angeles Posts: 1,961	I actually did notice a difference... ...as I climb a steep 1/4 mile hill in 2nd gear to get to my house. It's always the same hill, so that's constant. And driving up it everyday I have a good feeling for the resistance. The header definitely helped the engine make it up the hill easier. If you start climbing under 2,000 rpm, the engine labors sluggishly. But anything over 2,000 and it gains rpms much easier and climbs more easily than the stock header which feels like it's holding back at the same rpms.

11-21-2012, 01:32 PM	#152
xnamerxx 0-60 in slow Drives: light blue liftback Join Date: Aug 2009 Location: so cal Posts: 926	Basically what Cali said. There is a maximum of about 12" to work with and an ideal length of about 35" so most of the ots headers compensate by increasing the volume of tube which in essence give some of the same effect as increasing length but reduces scavenging at lower rpms. Now this motor is relatively small displacement with a good torque management system going to a larger diameter tube won't hurt you as bad as it would on a larger engine. So not wanting to give up anywhere in the powerband while still gaining some up top is the reason I decided to design and build my own header. As far as header type is concerned both a 4-2-1 and a 4-1 will accomplish the same goal but each design has its own advantages but both of them can produce near the same power and torque so there isn't a real advantage to choosing either one aside from packaging constraints, and a 4-1 is simply easier to package with the effecting lengths required.

12-01-2012, 09:20 PM	#155
TOLMACH Drives: soarer Join Date: Feb 2011 Location: Beautiful British Columbia Posts: 954	This is what I received yesterday http://photo.qip.ru/users/tolmach/96608749/129617602/ Same part number but Dc logo seems to be on the fourth tube as compared to this one (stole this pic from someone here) - here logo is on the third tube http://photo.qip.ru/users/tolmach/96608749/129617601/ have not tried installing it yet, but there seems to be enough space between the hole for the O2 sensor and top bracket Overall build quality of mine is not very impressive (kinda very average) as compared to the WR one

12-01-2012, 09:33 PM	#156
tooter play every day Drives: 2012 Yaris L 2dr 5sp Join Date: Apr 2012 Location: Los Angeles Posts: 1,961	That's one thing I really like about the Weapon R. It's precise. You could cut your finger on that sharp knife edge where the two main tubes are joined... But as far as performance, it doesn't matter.

12-01-2012, 10:20 PM	#157
xnamerxx 0-60 in slow Drives: light blue liftback Join Date: Aug 2009 Location: so cal Posts: 926	That's not a good thing, air doesn't like sharp edges.

12-01-2012, 11:07 PM	#159
xnamerxx 0-60 in slow Drives: light blue liftback Join Date: Aug 2009 Location: so cal Posts: 926	the slight knock it causes in flow won't make much of a difference.

12-02-2012, 01:55 PM	#162
xnamerxx 0-60 in slow Drives: light blue liftback Join Date: Aug 2009 Location: so cal Posts: 926	I wouldn't worry, all of the aftermarket headers lack a ventur,i so the collector looking bad wol make almost no difference.