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10-17-2011, 09:51 AM | #1 |
2ZR swap. DO IT! Ask how!
Drives: 09 Meteoric Metallic HB Join Date: Feb 2011
Location: West Michigan
Posts: 2,333
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1ZZ throttle body = 1.8L CAI?
I'm tinkering with a custom intake setup that will use the 1ZZ throttle body. It occurred to me that the larger diameter TB would be better suited to a CAI/SRI with a matching diameter/adapter. The K&N intake for the 1.8L yaris (part 69-8615TS) has a 2-5/8" ID at the TB, but the "normal" intake for the 1.5L has only a 2-1/4" ID. From what I've found in other threads here, the OD of the stock TB is 2-1/4". Has anyone measured the OD of a 1ZZ?
My question then is: will the intake for the 1.8L mount up correctly in a stock 1.5L engine bay? The instruction sheet makes it look like it would, but I'd rather have confirmation before dropping $300 on the kit. Oh, and sorry for all the acronyms. Trying to keep it brief. |
10-17-2011, 11:53 AM | #2 |
Drives: 2009 3dr LB Manual Join Date: Mar 2010
Location: Dublin, Ohio
Posts: 412
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I think you're overlooking one key aspect: our MAFS won't like a larger diameter intake pipe. If you put our MAFS in a larger pipe, you'll get a CEL, and the engine won't run smooth. I don't know if there's a way to "trick" the MAFS into thinking it's in a smaller pipe or not.
Side note, are you planning on getting more power and keeping good gas mileage with this? I keep reading, and haven't found a solid answer if the large throttle body will hurt my 45mpg. |
10-17-2011, 12:26 PM | #3 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Cranky, it won't work unless you're running a piggy back to correct the MAF reading. You'll be running lean with a larger intake pipe.
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10-17-2011, 03:10 PM | #4 |
2ZR swap. DO IT! Ask how!
Drives: 09 Meteoric Metallic HB Join Date: Feb 2011
Location: West Michigan
Posts: 2,333
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Hmm, now I'm confused. What's the point of using a larger throttle body with the stock intake then? Can the stock tubes take advantage of a wider throttle opening without dramatically altering the air flow volume? I'm not opposed to running a piggyback, but wasn't planning on adding one prior to going FI.
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10-17-2011, 03:36 PM | #5 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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problem with running larger pipe is that air velocity slows down across the MAF due to more available surface area for the air to travel. The MAF then translates this into less air going into the motor --> which leads to less fuel injected. When in reality MORE air IS going into the motor. So unless you're correcting those misread values, your motor will run lean.
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10-17-2011, 03:48 PM | #6 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Area of a 2.25" pipe --> 7.0686"
Area of a 2.625" pipe --> 8.2467" ∏D=Area So that's roughy 16% more surface area. If you corrected the fuelling by approximately that much you should be alright. |
10-17-2011, 04:30 PM | #7 |
2ZR swap. DO IT! Ask how!
Drives: 09 Meteoric Metallic HB Join Date: Feb 2011
Location: West Michigan
Posts: 2,333
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∏D = circumference
I get what you meant though. =) A = pi * r^2 2.625" = 5.41 in^2 2.25" = 3.98 in^2 which is actually a 36% increase in cross-sectional area. As far as the air velocity slowing down, that's because the displacement of the engine can only "suck in" so much air per stroke? I was thinking of it in terms of the air blowing into the larger filter and tube, but I guess that doesn't matter if the valves aren't open. So assuming that I get a piggyback and correct the A/F ratio, does the engine actually get more air/fuel per stroke? Last edited by CrankyOldMan; 10-17-2011 at 04:36 PM. Reason: math |
10-17-2011, 07:53 PM | #8 |
Drives: 08 Yaris hatchback Join Date: Oct 2011
Location: Detroit, Michigan
Posts: 39
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what if you use a larger tube then bottle neck it? i mean putting the MAF sensor in the smaller part of the tube.....would that work? i've wanted to do that same mod, but knew it might not work out
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10-17-2011, 09:07 PM | #9 |
2.25" = 57.15mm. The smallest diameter in the intake system is still the throttle body. A 1zz TB has a 55mm bore. As long as your intake is larger than that you wont have a problem. The smaller bore of the TB will limit the amount of air that can pass freely through the intake system.
I believe that the 1NZ intake is actually 60mm not 2.25". 60mm = 2.362" |
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10-17-2011, 09:18 PM | #10 |
daily driver
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do like me
run a 2.5" tube before the maf and 2.25" from the maf to the tb speeds the air up at the maf since 2.5" of air has to go to 2.25" then down to 1.75 at the tb i don't know if it does anything, but i dyno'd 106whp and 107 wtq with just an intake and my resonator-back exhaust (which by the way, is for sale)
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10-17-2011, 09:32 PM | #11 |
Drives: 08 Yaris hatchback Join Date: Oct 2011
Location: Detroit, Michigan
Posts: 39
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interesting.....so doing a 3" pipe from the air filter to the MAF size pip wont give you much gains?
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10-18-2011, 11:45 AM | #12 |
2ZR swap. DO IT! Ask how!
Drives: 09 Meteoric Metallic HB Join Date: Feb 2011
Location: West Michigan
Posts: 2,333
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I just looked over the installation instructions again and the 1.8L intake from K&N (for the Scion xD) still uses the stock MAF section, but that would still cause the same problem, since I'm sure the xD has a larger intake diameter. Crap.
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10-18-2011, 12:50 PM | #13 |
Drives: 08 Yaris hatchback Join Date: Oct 2011
Location: Detroit, Michigan
Posts: 39
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could we use the MAF from a Toyota Celica, then make the pipe bigger?
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10-18-2011, 12:56 PM | #14 |
2ZR swap. DO IT! Ask how!
Drives: 09 Meteoric Metallic HB Join Date: Feb 2011
Location: West Michigan
Posts: 2,333
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10-18-2011, 12:58 PM | #15 | |
Drives: 06 Polar White 5dr, 13 Soul 4u Join Date: Oct 2008
Location: Georgetown, Ontario, Canada
Posts: 5,740
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Quote:
CTScott has spent some time on trying to figure out if/how the ECU fuel map could be remapped. No success.
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10-18-2011, 01:07 PM | #16 |
Drives: 08 Yaris hatchback Join Date: Oct 2011
Location: Detroit, Michigan
Posts: 39
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hmmmmm, there has gotta be some little trick to it that wont make the engine run too lean. i was also toying around with the idea of dual air intakes, by spliting the intake with a Y pipe and putting 2 cone filters, then running flexible tubeing from behind the fog light area, or cutting a retangle in my bumper right in from of the original intake and removing tis little rubber piece thats part of the radiator frame (kinda like what you can do on the Nissan 350's) but that would just be to push more air to the filter(s)
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10-18-2011, 01:20 PM | #17 |
daily driver
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post up when you blow up your engine, vince
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10-18-2011, 01:40 PM | #18 |
Drives: 08 Yaris hatchback Join Date: Oct 2011
Location: Detroit, Michigan
Posts: 39
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lol, will do if it comes to that. but i like to do my homework before messing up my "baby".......and all i wanna do is give the "black dragon" some extra zip
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