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

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.

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.

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.

tooter · 12-02-2012, 04:50 PM

Quote:

Originally Posted by TOLMACH

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

Hopefully, will still do its job

It will work just fine.

The DC is a time tested design. And in my opinion, trailing edges don't matter. Those are the edges that point in the direction of the exhaust flow.

1.5 · 12-02-2012, 05:04 PM

Tolmach yours also does not have the ceramic coating. I thought all DC headers for the yaris came coated.

Is it a replica? Poor build quality, alteration of branding, and lack of ceramic coating... sounds like a Rep.

Golddeenoh · 12-02-2012, 10:00 PM

Tolmach, your pipes look kind of small as well but then again my Megan Racing header is 3mm larger diameter but i wouldn't think that i could tell the size difference in a picture with out side by side comparison.

NJ Drive · 12-02-2012, 10:55 PM

Can someone measure the I.D. on one of the primaries on this header? It looks similar to the OEM and somewhat smaller than the Weapon R header.

11-21-2012, 12:08 PM	#146
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	#148
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,857	^ 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	#149
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,857	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	#155
tk-421 Super Moderator View User's Garage Drives: 5D-07-LB Join Date: Jan 2007 Location: Dagobah Posts: 4,262	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.

12-02-2012, 05:04 PM	#160
1.5 Form>Function Drives: 07 Flint Sedan Join Date: Dec 2009 Location: Tampa Posts: 4,018	Tolmach yours also does not have the ceramic coating. I thought all DC headers for the yaris came coated. Is it a replica? Poor build quality, alteration of branding, and lack of ceramic coating... sounds like a Rep. __________________ Instagram: @southernstreets_phil Facebook.com/southernstreetsempire

11-21-2012, 12:20 PM	#147
tooter play every day Drives: 2012 Yaris L 2dr 5sp Join Date: Apr 2012 Location: Los Angeles Posts: 1,962	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	#150
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, 09:33 PM	#153
tooter play every day Drives: 2012 Yaris L 2dr 5sp Join Date: Apr 2012 Location: Los Angeles Posts: 1,962	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	#154
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	#156
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	#158
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.

12-02-2012, 10:00 PM	#161
Golddeenoh Takes corners too fast! View User's Garage Drives: Absolute Red 2009 Yaris HB Join Date: Apr 2012 Location: Columbia, SC Posts: 830	Tolmach, your pipes look kind of small as well but then again my Megan Racing header is 3mm larger diameter but i wouldn't think that i could tell the size difference in a picture with out side by side comparison. __________________ mods:15''Drag DR21 w/Nitto NeoGen 205/50R15, Tanabe DF210 lowering springs 1.6/1.8, TRD Rear Sway Bar, Tanabe Front Sway Bar, Micro Image Short Throw Shift Kit (both in and under), 8.64lbs flywheel, F1 Stage 4 Clutch, AEM Cold Air Intake (Red), Megan Racing Header, DC Sports Axle Back Exhaust, Micro Image Crank Pulley, NST lite Alternator Pulley, ARP Manifold Stud Kit,Tanabe Front Strut Tower Brace, ScanGuage II, Micro Image Silicone Radiator Hose Kit (Red), NRG Carbon Fiber Shift Knob (round), 2009-2011 Toyota Yaris Liftback Foglight kit, NRG Grounding Kit (Red), Hella Horns(Red),CF Hood

12-02-2012, 10:55 PM	#162
NJ Drive Drives: 2012 Yaris SE Join Date: Nov 2011 Location: Northern NJ Posts: 179	Can someone measure the I.D. on one of the primaries on this header? It looks similar to the OEM and somewhat smaller than the Weapon R header.