How much of an increase does a throttle body upgrade give you on an essentailly stock lt1.. thanks guys

 

52mm maybe 1 hp
58mm probably lose 5-10

 

Waste of money on a stock motor.
You need heads and cam at least to need a bigger TB.

 

I agree with these guys--the stock TB is more than adequate on a stock motor. (Which doesn't really answer your question, but that's my .02)

 

It's really up to you. I don't have heads/cam work yet, but I plan to in the future. I went ahead and got a BBK 52mm TB. If you are going to go ahead and get a larger TB, get a 52mm and not a 58mm. The 58 is for real modified cars and will hurt you if you're stock. The 52mm should give you a little better throttle response and could give you a few ponies on top end.

 

just wondering how in the hell you would loose 10-15 hp on a 58mm tb???? I know people that run 52 and 58mm tb's

 

You won't lose any with the 52. But you will with the 58. The 58mm is just too big for a stock engine. It's having too little air go through too big of a space. Once you get more engine work and you are sending a lot more through your engine, then the 58mm is ideal, but not to start off with.

 

stick to stock...hell, even with my sig mods, i'm not sure if i need a 52mm tb...i'm guessing i do...not sure though.

 

You could lose 10-15hp because I think with the 58mm TB, you are hurting the velocity of the air going into the intake. Someone correct me if I am wrong. Anyways, don't spend money on a TB unless you are going to get very serious about engine mods....

 

I agree... stay with stock for now with your stock LT1... if you really get into it I'd say go with a 58mm tb... otherwize just go for the 52.

Trevor

 

52mm is good before headers I have or had the hpp borla cat back

march underdrive pullies and thats it m6 dynoed 291 321 pounds of tq, yes it does help you top end, I noticed 4th gear punch I would hit 130 quicker before stocker,

Now I have the heasders and lt1 edit leaned it out gained exactly 19 horses 16 pounds of torque With a dyno of 310 340tq,,, Stock engime baby ls1s hate me

 

there is an impala guyt hat im good friends with that gained .3 in the 1/4 with the 58 over the 52. he also gained .2 from the stock to the 52. call BS all you want, but its true, and there is timeslips to prove it. all he has is headers and ramair for the most part.