HEADER & INTAKE R&D. - Page 3 - Toyota Yaris Forums

Violin · 11-13-2006, 03:38 PM

Will someone in the Bay area please step up?

YamilR · 11-13-2006, 03:46 PM

I will be flying out of the country for 18 days during christmas time. I can volunteer my car but It will need to be picked up and dropped off here in Fl and off course a free header will be great. Holla

grimez · 11-13-2006, 09:40 PM

Quote:

Originally Posted by Katana

From what I generally know, a 4-2-1 design is better from a 4-1 design.My Yaris has 4-1 header and some technicians have told me that this is bad, because the engine's gases are immediately compressed into one tube, than gradually compressing them from 4 tubes, to 2 tubes, to 1 tube(4-2-1).

This might be true. I'm a chemical engineer, and the effects of combining gases can many times generate unwanted slowing turbulence. In the end, if the distance between the two separate joints is long enough, the gases will become less turbulent before they mix again. This would help in keeping the gas passing through faster.

Just my 2 cents.

LVAquaman · 11-14-2006, 12:55 AM

WRLEO,
I am in LV. I can be there on Sunday. Let me know if you can not find any other takers.

eTiMaGo · 11-14-2006, 01:56 AM

actually I recently read a pretty technical article (I think it was in "Turbo" magazine), about the difference between 4-1 and 4-2-1 headers, essentially a 4-1 header will give you more of a large improvement at high revs, while a 4-2-1 is a more linear improvement over the whole rev range. I'll have to read it again to get the finer points (or scan it and post here?)

*Chris07LB* · 11-14-2006, 08:14 AM

4-1 is fine with me, as 99% of my commute is steady high speed highway miles for just over an hour each way.

Katana · 11-14-2006, 01:12 PM

Quote:

Originally Posted by the_saint

Might as well put in my $0.02.
From what I remember & I've been told (back in my V8 days) 4-1 or longtube headers are more for WOT/drag racing because the exhaust doesn't have much in the way of restriction...but as a result you lose low RPM power/torque.
With the 4-2-1 style headers you get better drivability because (when properly engineered) the layout of the tube and the order in which they come together helps scavange or suck exhaust out which is supposed to help low end power.

So, in short...
4-1 better for drag racing
4-2-1 better for daily driver

Quote:

Originally Posted by grimez

This might be true. I'm a chemical engineer, and the effects of combining gases can many times generate unwanted slowing turbulence. In the end, if the distance between the two separate joints is long enough, the gases will become less turbulent before they mix again. This would help in keeping the gas passing through faster.

Just my 2 cents.

Well, generally this is the basic idea.

But then, why Toyota chose a 4-1 design for mine???I mean, I am supposed to be using the car on city streets, so I need it to be drivable.

WRLEO · 11-14-2006, 02:43 PM

Im willing to give a deal to 5 guys to try out and give feedback at a discount.
PM for details. We are still on for monday for the dyno test and full on pictures on monday..

Galavoxx · 11-14-2006, 04:06 PM

Quote:

Originally Posted by WRLEO

Im willing to give a deal to 5 guys to try out and give feedback at a discount.
PM for details. We are still on for monday for the dyno test and full on pictures on monday..

I just PM'd. Let's see what happens. I would love to get a header, although I've yet to get a CAI or an exhaust...

ChinoCharles · 11-14-2006, 04:10 PM

Quote:

Originally Posted by Galavoxx

I just PM'd. Let's see what happens. I would love to get a header, although I've yet to get a CAI or an exhaust...

Gotta start somewhere, right?

Galavoxx · 11-14-2006, 04:14 PM

True. And if those Dyno numbers are accurate, 11 hp is a very nice start.

*Chris07LB* · 11-14-2006, 04:56 PM

Quote:

Originally Posted by WRLEO

Im willing to give a deal to 5 guys to try out and give feedback at a discount.
PM for details. We are still on for monday for the dyno test and full on pictures on monday..

Ive posted lots of DIY How_To's around here... Id be willing to do a full review on one of your headers, along with step by step install instructions. Feel free to read up on a few of my reviews posted in the How_To Section of this site.

PM me if interested.

WRLEO · 11-14-2006, 04:59 PM

Ok found a car local in San Francisco..
Will be dyno testing tommorrow.. :)

WRLEO · 11-14-2006, 05:06 PM

Quote:

Originally Posted by Galavoxx

I just PM'd. Let's see what happens. I would love to get a header, although I've yet to get a CAI or an exhaust...

We'll see if we cna make a decent intake system also.. :)

Galavoxx · 11-14-2006, 05:07 PM

Quote:

Originally Posted by WRLEO

Ok found a car local in San Francisco..
Will be dyno testing tommorrow.. :)

Yeah!!! That's me. I can't wait for that extra hp. Thanks Leo. See you at 9am.

YamilR · 11-14-2006, 05:24 PM

Quote:

Originally Posted by Chris07LB

Ive posted lots of DIY How_To's around here... Id be willing to do a full review on one of your headers, along with step by step install instructions. Feel free to read up on a few of my reviews posted in the How_To Section of this site.

PM me if interested.

WRLEO, if I was you I'll take this offer very seriously, He's the top "HOW_To er" in this forum

Katana · 11-15-2006, 01:31 PM

Quote:

Originally Posted by WRLEO

Im willing to give a deal to 5 guys to try out and give feedback at a discount.
PM for details. We are still on for monday for the dyno test and full on pictures on monday..

I am here when you manufacture a header for the 1.3lt engine.Just don't forget me.

ItsMyDaily · 11-15-2006, 03:03 PM

Quote:

Originally Posted by WRLEO

Ok found a car local in San Francisco..
Will be dyno testing tommorrow.. :)

I hope you guys also do a stock dyno before dynoe with the header. that way we see gains by comparing both graphs.

11-14-2006, 01:56 AM	#41
eTiMaGo vroom vroom View User's Garage Drives: lil red 5-door Join Date: Sep 2006 Location: Bangkok, Thailand Posts: 7,744	actually I recently read a pretty technical article (I think it was in "Turbo" magazine), about the difference between 4-1 and 4-2-1 headers, essentially a 4-1 header will give you more of a large improvement at high revs, while a 4-2-1 is a more linear improvement over the whole rev range. I'll have to read it again to get the finer points (or scan it and post here?) __________________ The price of freedom of religion, or of speech, or of the press, is that we must put up with a good deal of rubbish. - Robert Jackson Bye bye 1NZ...

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11-13-2006, 03:38 PM	#37
Violin View User's Garage Drives: 2007 Yaris LB Auto Join Date: Jul 2006 Location: New Jersey Posts: 1,592	Will someone in the Bay area please step up?

11-13-2006, 03:46 PM	#38
YamilR View User's Garage Drives: Absolutely Red Liftback Join Date: Aug 2006 Location: San Diego, CA Posts: 570	I will be flying out of the country for 18 days during christmas time. I can volunteer my car but It will need to be picked up and dropped off here in Fl and off course a free header will be great. Holla

11-14-2006, 12:55 AM	#40
LVAquaman Drives: 2007 Yaris Hatchback Join Date: Aug 2006 Location: Las Vegas Posts: 39	WRLEO, I am in LV. I can be there on Sunday. Let me know if you can not find any other takers.

11-14-2006, 08:14 AM	#42
Chris07LB Super Moderator View User's Garage Drives: Yaris Liftback Join Date: Jun 2006 Location: New Jersey Posts: 3,174	4-1 is fine with me, as 99% of my commute is steady high speed highway miles for just over an hour each way.

11-14-2006, 02:43 PM	#44
WRLEO Drives: Yaris Join Date: Nov 2006 Location: San Francisco Posts: 46	Im willing to give a deal to 5 guys to try out and give feedback at a discount. PM for details. We are still on for monday for the dyno test and full on pictures on monday..

11-14-2006, 04:14 PM	#47
Galavoxx View User's Garage Drives: Yaris Hatch Join Date: Oct 2006 Location: San Francisco Posts: 397	True. And if those Dyno numbers are accurate, 11 hp is a very nice start.

11-14-2006, 04:59 PM	#49
WRLEO Drives: Yaris Join Date: Nov 2006 Location: San Francisco Posts: 46	Ok found a car local in San Francisco.. Will be dyno testing tommorrow.. :)