Subject	An important point to remember when going to larger TBs
Posted by	BlackholeZ on October 03, 2012 at 5:19 PM
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In Reply To	How effective are larger TB's? posted by Evan(CA) on October 02, 2012 at 01:44 PM
Message	You are going to lose resolution at small throttle openings. Yeah, they flow more at the top end, but drivability is going to suffer. I used to have to do throttle linearization to power output and the larger the bore, the less linear. I've seen as little as 10% throttle movement correlating to 50% of max power. This makes it very difficult to modulate the throttle at low speeds. This is why most big carburetors don't open all the butterflies simultaneously. Now I don't know how much the larger throttle bodies will affect a given car, that has a lot to do with other breather mods that are on the car and how much of the total restriction is provided by the throttle bodies. A quad throttle body arrangement could help, but would be really complicated. A throttle cable pulley that is not constant radius could be built that compensated for non linear response. A fly by wire throttle could be programmed with a surface curve, that was pretty much how I did it. -Dan BlackholeZ VTC Solenoid Caps Installation Procedure "Capitalization is the difference between helping your Uncle Jack off a horse, and helping your uncle jack off a horse." "'she' also likes to swap since I think I am going to need to give her to woody again." - Dvlhntr "full alphabetic boost mode" - ChristopherTheOne "Two oil eating, angry, spinning triangles of death." - turtleboy on rotary engines "You're the Skrillex of Z32s." BradX (UF)
Follow Ups	How effective are larger TB's? - Evan(CA) 13:44:32 10/02/12 This is a great question, and I look forward to the answer - Haasz32 14:45:27 10/02/12 you will get someone telling you that it'll be a bottleneck - fuzzymonkey 15:09:45 10/02/12 Sounds like you've changed your tune :) - Evan(CA) 16:31:59 10/02/12 wow, nice find! for a site i'm NEVER on... - fuzzymonkey 17:14:54 10/02/12 I only remembered it because I was the OP of the thread. - Evan(CA) 17:42:59 10/02/12 Difinately not worth the gains considering the head aches - Evan_Wright (Ca) 15:20:28 10/02/12 I'm thinking manifolds - LJZTT 15:32:08 10/02/12 Having held both OEM and MSP manifolds in my hands - Evan(CA) 15:48:44 10/02/12 It is as easy as you say. I used a die grinder. (n/m) - Evan_Wright (Ca) 16:01:00 10/02/12 Well like I said, my situation is likely different.... - LJZTT 16:52:09 10/02/12 all you need to do is enlarge the plenum intake - vorpalZ 17:20:05 10/02/12 Its soft aluminum. not even that hard to do with a dremel. (n/m) - Antihero 11:29:57 10/03/12 if you have all afternoon... :) (n/m) - vorpalZ 14:38:03 10/03/12 Id be surprised if it took me more than an hour. - Antihero 10:45:37 10/04/12 you mean for stanza or for z1? - Antihero 15:54:13 10/02/12 Die grinder with Al cutting/grinding tip, 10 min/side - vorpalZ 15:58:51 10/02/12 bing - fucking - DOE! .... dremel tool works wonders (n/m) - genic 15:40:51 10/04/12 Did you do Stanza TBs or RobZ/Z1? - BlackholeZ 17:04:58 10/03/12 Check out what Rob'Z did. - TheMarlin (MidTN) 17:22:50 10/02/12 The low end gain is not correct . - ArubaDave 18:09:03 10/02/12 Sure enough. - TheMarlin (MidTN) 21:57:26 10/02/12 Not entirely true - Rob'Z 23:30:31 10/02/12 I see - ArubaDave 08:16:15 10/03/12 Re: How effective are larger TB's? - KA8 04:16:45 10/03/12 An important point to remember when going to larger TBs - BlackholeZ 17:19:13 10/03/12 there is a solution to opening resolution by changing the - Dane (Houston) 23:05:16 10/03/12 very nice...thanks for that (n/m) - aliaZ 06:58:55 10/04/12 Exactly, that's what I meant by throttle pulley. - BlackholeZ 15:15:50 10/04/12 Throttle modulation didn't seem to be much of an issue after - maglito 20:46:16 10/05/12
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