52 mm throttle body
Stock intake is pretty much THE choice, people INCORRECTLY ASSume that since there are upgrades for thfor the bigger TB. gen 1 and LS motors the LT1 intake must need replacement too and it doesn't.
as said the automatic tranny needs tuning
as said the automatic tranny needs tuning
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TECH Addict
Joined: Dec 2010
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From: Maricopa, AZ
TECH Addict
Joined: Dec 2010
Posts: 2,610
Likes: 4
From: Maricopa, AZ
Put the stock TB back on until you get a tune.
Last edited by hrcslam; Oct 31, 2015 at 04:38 PM.
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larger TB's have their place on larger C.I., H/C motors with the proper "supporting" mods
while the 52 mm won't hurt performance on a basic stock motor........ as you found out your transmission was not shifting properly. Your tranny is saying stop what the F you are doing until you do what is needed to install one.....assuming you even need one
Capricemgr also brings up another good point in that many aftermarket TB's require modifications to get them to idle right. No big deal if you know wtf you are doing, have scan software to read IAC counts the adjustments can be made. A stock TB bored to 52 will be way easier to deal with but you still need PCM adjustments for auto cars
Unless you have H/C, headers, larger injectors you really don't need a larger TB. If so fine but we don't know what other mods you have
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From: centerville, ohio
I have ran across a few articles were people have ran actual tests on switching to 52mm throttle bodies. They have all netted 6-7 hp and tq.
http://www.superchevy.com/how-to/eng...-motor-part-2/
http://www.superchevy.com/how-to/eng...-motor-part-2/
I have a stock TB bored to 52 mm on my Z28 with auto transmission and never had any issues with it. The car was never tuned and the transmission shifts the same as before I installed it. I always heard that the 58 mm throttle would mess with shifting on auto cars if not tuned.
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I have a stock TB bored to 52 mm on my Z28 with auto transmission and never had any issues with it. The car was never tuned and the transmission shifts the same as before I installed it. I always heard that the 58 mm throttle would mess with shifting on auto cars if not tuned.
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The 52mm TB on your car will effect the automatic transmission, whether you feel it or not. There's no way it doesn't. The way the computer selects its gears, shift points, shift speed, and line pressures are directly effected by the TPS and MAP sensors, the relationship between those two are directly effected by a change in TB bore.
I've seen it too many times where TB mods are done on an automatic car and the trans fails prematurely due to clutch wear. You don't always feel it, but it's happening.
I've seen it too many times where TB mods are done on an automatic car and the trans fails prematurely due to clutch wear. You don't always feel it, but it's happening.
The problem isn't instant.
What happens is the engine is making a little more power for a given throttle position so at each shift it slips the clutches just a little more than designed. Can contribute to a slow death of a tranny.
What happens is the engine is making a little more power for a given throttle position so at each shift it slips the clutches just a little more than designed. Can contribute to a slow death of a tranny.