58mm throttle body on stock engine
It's overkill no need to add a 58mm or even a 52mm on a stock engine. The stock manifold and heads/cam only allow so much air to flow through the engine. You may even lose a little bottom end with a 58mm.
Last edited by StealthFormula; Feb 12, 2008 at 08:27 AM.
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my car made around 550 with the stock one and forced induction. how much will a 58 benefit me?
I have a 58 on my car and the only thing i have is maf and a k&n cai rite now. I got it for free so i used it. I noticed a differance is throttle response but nothing else. Didnt seem to loose or gain anything its exactly the same just snappier.
Shouldn't really hurt any, but you don't really need it.
My car happened to have one when I bought it (mounted to an unported manifold with an adapter).
I opened the bores to match when I did my LE-ported H/C/I install.
Remember that stock manifold ports are only 52mm, putting a bigger intake on there without porting
is probably not the smartest idea.
My car happened to have one when I bought it (mounted to an unported manifold with an adapter).
I opened the bores to match when I did my LE-ported H/C/I install.
Remember that stock manifold ports are only 52mm, putting a bigger intake on there without porting
is probably not the smartest idea.
My 383" didn't make more power with a 58mm versus a 52mm until it started to make more than 500 rwhp. Last time I tested it the 52mm made 526 rwhp, the 58mm made 532. All gains were above 6500. That is, of course, NA. I would be suprised if a boosted engine gained more than that.
Of course, old as I am, I have not sen everything yet.
Of course, old as I am, I have not sen everything yet.
My 383" didn't make more power with a 58mm versus a 52mm until it started to make more than 500 rwhp. Last time I tested it the 52mm made 526 rwhp, the 58mm made 532. All gains were above 6500. That is, of course, NA. I would be suprised if a boosted engine gained more than that.
Of course, old as I am, I have not sen everything yet.
Of course, old as I am, I have not sen everything yet.
As far as the OP is concerend... no it won't make a difference. I don't see how a TB is entered into the volumetric efficiency equation.
Last edited by SS RRR; Feb 14, 2008 at 10:38 PM.
When he tuned my car years ago he yelled at me for having a ported maf. We put stock halves and my ported ones on and there was no difference. Dynoed 370rwhp (numbers were grossly off since it was only running 110mph after that dyno and when I actually made 370rwhp I was running 115mph) That was probably extremely usless for you, but hey.. I'm bored.
Hopefully you can break 115mph with your new setup
I don't yell at people like that, I try to explain that is a useless deal. I saw only 3 or 4 rwhp from an 85mm MAF over a stock MAF at 420 rwhp, and then only at very high RPM. I didn't gain anything in speed density mode until 460/475 rwhp. Then about 1/2 MPH and 3 or 4 hundredths of a sec quicker. Then every time the weather changes I had to tweak temp correction tables. 95% of guys doing that stuff are wasting time and
money.
money.
I am not going to get into whether an 58mm is worthwhile. I am however going to try and see if I can make some sense of information.
I think MOST claims of big power gains from TB swaps are from people who can not tell the difference between throttle response and power. First time my wife drove the Caprice after the 58mm swap and other mods including a 600rpm stall rise she nearly launched backwards across the road backing out of the driveway. Even with a converter that should have left it a little looser the big bores drastically alter lowend throttle response.
Anyone losing power I have to wonder what they did wrong, like maybe not opening up the bores right and leaving some intrusion into the bore which would be a BIG hinderance to flow.
I think MOST claims of big power gains from TB swaps are from people who can not tell the difference between throttle response and power. First time my wife drove the Caprice after the 58mm swap and other mods including a 600rpm stall rise she nearly launched backwards across the road backing out of the driveway. Even with a converter that should have left it a little looser the big bores drastically alter lowend throttle response.
Anyone losing power I have to wonder what they did wrong, like maybe not opening up the bores right and leaving some intrusion into the bore which would be a BIG hinderance to flow.