2.0 throttle body mod's., what have you used with what issues |
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2.0 throttle body mod's., what have you used with what issues |
orange914 |
Dec 13 2007, 03:20 PM
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#1
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
just wondering what t.b. conversions are out there and what issues have been incured?.
what size is the stock t.b. anyway |
Jake Raby |
Dec 13 2007, 04:59 PM
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#2
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
The stock unit is adequate for 150HP and 2300ccs....
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Krieger |
Dec 13 2007, 05:18 PM
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#3
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Advanced Member Group: Members Posts: 4,731 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None |
The stock TB has a 45mm plate. You could bore out the stock TB 3 mm or so before you start to run out of roomand have a new plate made. The opening in the plenum it bolts to is wider than the TB- I can't remember but its about 50 mm. I don't think anyone makes conversion.
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914Sixer |
Dec 13 2007, 05:45 PM
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#4
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914 Guru Group: Members Posts: 8,909 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
Jake said it all !!!
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jd74914 |
Dec 13 2007, 06:09 PM
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#5
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Its alive Group: Members Posts: 4,782 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
Don't bore it out.
Think of it using this equation: m(dot)= p*A*V. (p is a constant, the density of air) The engine consumes a finite amount of air (M(dot)). This value is only dependent on engine speed. The air's speed is inversely dependent on the area of the TB/runners it flows through (A). When these have larger cross-sectional areas the air inside of them moves at a slower rate (V), which kills efficiency. Maximum power can be found with air speeds of around .4 or .5 mach usually. Once you go supersonic efficiency drops though. Basically you want high intake port air velocity for best performance. (IMG:style_emoticons/default/smile.gif) |
orange914 |
Dec 13 2007, 11:08 PM
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#6
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
Don't bore it out. Basically you want high intake port air velocity for best performance. (IMG:style_emoticons/default/smile.gif) The stock unit is adequate for 150HP and 2300ccs.... (IMG:style_emoticons/default/thumb3d.gif) sounds like any mods would defeat any gains for street 2056 d-jet |
TeenerTim |
Dec 14 2007, 09:53 AM
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#7
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Senior Member Group: Members Posts: 597 Joined: 22-October 07 From: Norfolk,VA Member No.: 8,253 Region Association: MidAtlantic Region |
Is the 2.0 bigger than the 1.7 and do the 2.0 injectors flow more than the 1.7?
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jd74914 |
Dec 14 2007, 10:03 AM
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#8
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Its alive Group: Members Posts: 4,782 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
2.0 Injectors flow significantly more than 1.7s. I would assume the TB is also larger.
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Jake Raby |
Dec 14 2007, 02:28 PM
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#9
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
The 2.0 plenum is larger, but it's design is the least effective of all the plenums, even on larger displacement engines. Design overcomes size in this situation.
Boring out the stock T/B without altering the engine and the rest of the intake system only HURTS drivability, especially throttle response. Been there, done that. |
orange914 |
Dec 14 2007, 05:38 PM
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#10
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
The 2.0 plenum is larger, but it's design is the least effective of all the plenums, even on larger displacement engines. Design overcomes size in this situation. is air flow of the plenum ineffective becouse of shape (boxy/not smooth air flow) or other factor/s? if so has any one messed with upgrading negatives of 2.0 plenum? mostly just curious (IMG:style_emoticons/default/idea.gif) |
sean_v8_914 |
Dec 15 2007, 12:58 PM
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#11
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
jake:
tell us more about the 2.0 plenum. would a 1.8 plenum work better with a 2.0 TB on a 2.0? what did you discover to be the problem with this plenum? |
ConeDodger |
Dec 15 2007, 01:04 PM
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#12
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Apex killer! Group: Members Posts: 23,622 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California |
just wondering what t.b. conversions are out there and what issues have been incured?. what size is the stock t.b. anyway Mike, Your toes are on the diving board at the pool of misery. Change that and you have a chain of changes you must make to rectify the way the car runs. (IMG:style_emoticons/default/blink.gif) |
orange914 |
Dec 15 2007, 05:16 PM
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#13
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
just wondering what t.b. conversions are out there and what issues have been incured?. what size is the stock t.b. anyway Mike, Your toes are on the diving board at the pool of misery. Change that and you have a chain of changes you must make to rectify the way the car runs. (IMG:style_emoticons/default/blink.gif) yep, i guess i was more curious. mostly q&a session while im waiting on my cylinders for the next stage of the build. hopefully i'm not leaving any stones unturned on this 1.7 to 2056 d-jet conversion. jeff's going to set the mps/check the harness. always good to know others experiances with this stuff (IMG:style_emoticons/default/beerchug.gif) mike |
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