throttle body too small for cam?
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throttle body too small for cam? ok guys i just talked to the local guy who is tunning my car, and he is saying that my cam is too large or a cam for a stock throttle body and i just wanted to check with a few of the more knowledgeable guys on here if he is infact correct, the cam is a Custom Grind from Speed Inc, Cadillac Cam is its name, the duration is 212 intake 219 exhaust and the lift is .530 intake and .540 exhaust. Now when the cam was put into the car it went in with LS7 lifters, dual valve springs, new pushrods, and new 1.6RR's.
so my question is the cam would now have a lift of .565 and .576 with the increased lift of the 1.6RR's correct?
so that being said, the car has all the mods in my sig and i was wondering if i might need to bump up to the next size throttle body or should the stocker be fine?
thx in advance guys!
so my question is the cam would now have a lift of .565 and .576 with the increased lift of the 1.6RR's correct?
so that being said, the car has all the mods in my sig and i was wondering if i might need to bump up to the next size throttle body or should the stocker be fine?
thx in advance guys!
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From: Warner Robins Ga
I thought stock TB was good for 450hp(fly). But then again Shon Herron ran a 52 when he had bolt-on record I believe anyway. I'd be willing to say most will try to steer you away from going bigger. If it were me I'd stay with the stocker and spend the $ on other mods like a stall or gears.
Yeah you are only losing out on a few ponies with the stock. You can find some decently priced 52mm on ebay. I picked mine up off there for about $200 shipped. Professional Products..not bad quality for the buck.
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^^All the ones I have seen have them yes.
Your fine right now with the stock TB, there are tons of guys who have ran very successfully with larger cams and stock TB's like myself in the past. Grabing a 52MM TB would probaly give you a couple horses but IMO not really worth the $$$ but it wont hurt if you really want to (like Elliot said $200 some change for a Prof. Products off Ebay.
Again to answer your question your stock TB is fine at this point and if it were me I would put the money towards a Stall that will show some huge gains!
Your fine right now with the stock TB, there are tons of guys who have ran very successfully with larger cams and stock TB's like myself in the past. Grabing a 52MM TB would probaly give you a couple horses but IMO not really worth the $$$ but it wont hurt if you really want to (like Elliot said $200 some change for a Prof. Products off Ebay.
Again to answer your question your stock TB is fine at this point and if it were me I would put the money towards a Stall that will show some huge gains!
Last edited by StealthFormula; Dec 15, 2008 at 06:05 PM.
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From: North Phoenix, AZ
btw one more question, those lift numbers i stated with the 1.6RR's are correct right?
I don't know why I mentioned a bigger throttle body, don't think I was thinking straight today for some reason. I have a ported stocker on our Caprice LT1 with an aftermarket airfoil and I did notice better throttle response, but at this point in time it is not a necessity. The thing with PNYKLR-TA current setup is that the IAC counts are bottomed out at zero, which IMO would indicate that it is getting too much air. In gear it is around 43 counts. With the idle moved up for the cam, it wants to pull the car really bad at a light. IIRC idle in gear is 700, money would be better spent on a stall.
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I don't know why I mentioned a bigger throttle body, don't think I was thinking straight today for some reason. I have a ported stocker on our Caprice LT1 with an aftermarket airfoil and I did notice better throttle response, but at this point in time it is not a necessity. The thing with PNYKLR-TA current setup is that the IAC counts are bottomed out at zero, which IMO would indicate that it is getting too much air. In gear it is around 43 counts. With the idle moved up for the cam, it wants to pull the car really bad at a light. IIRC idle in gear is 700, money would be better spent on a stall.
its all good, just thought i'd get a consensus on what everyone else thought. and yea i think the stall and tranny refresh will be my little xmas present to myself
thanks again Sean!
Stick with the stock throttle body. We have done some more testing on my IHRA Stocker recently. It made 402 rwhp and ran a 10.53 @ 125 mph in bracket mode (3050 lbs N/A). I have to run the stock throttle body.
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If you can get a 52mm cheap (or have your's ported out by someone local for really cheap), I'd not pass it up. Though Gizmo is proof that you really don't need it, but on the flip side of that coin, how much could Giz make if he went bigger? I'm honestly interested to see that and would donate $10 (hey I'm poor) to another dyno run to see 
Stock intake can take 54mm (which Profession Products sell, last I checked, on eBay). The only noticeable gain is much improved throttle response
As for the 1.6RR question, that's all dependent on what your cam card says. Here is an example of one Click Me. As you can see in the upper right corner it says "In1.65 Ex1.65" which means those .501 lift numbers are reflective of having 1.65RR.
I notice you have headers, but are you running fully stock exhaust from there back?
And what was the tuner's reasoning for the bigger TB? Do they sell one? I ask because I'm thinking it was just to get you to buy one from them
Stock intake can take 54mm (which Profession Products sell, last I checked, on eBay). The only noticeable gain is much improved throttle response
As for the 1.6RR question, that's all dependent on what your cam card says. Here is an example of one Click Me. As you can see in the upper right corner it says "In1.65 Ex1.65" which means those .501 lift numbers are reflective of having 1.65RR.
I notice you have headers, but are you running fully stock exhaust from there back?
And what was the tuner's reasoning for the bigger TB? Do they sell one? I ask because I'm thinking it was just to get you to buy one from them
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ok so my cam card has the values for a 1.5RR because i never told comp cams i was changing them out to 1.6's.
and my tuner is actually the guy who replied a few posts up the one talking about what my car was reading when he was plugged into it. and no i highly doubt he was trying to get me to buy another throttle body, and i dont even think he sells any parts really more of a auto repair shop than retail shop.
if you read his post it will make it clear why he thought a bigger TB would help, the name is like 'pcs9449', his name is Sean and he is a great mechanic to work with and always gives me little pointers as im not the most knowledgeable F-body guys this is my first
but im learning
and my second question is would the 1.6RR's increase duration as well?
like if the cam card had 212-219 with the 1.5rockers would it then be 226-233 with the 1.6RR's?
and my tuner is actually the guy who replied a few posts up the one talking about what my car was reading when he was plugged into it. and no i highly doubt he was trying to get me to buy another throttle body, and i dont even think he sells any parts really more of a auto repair shop than retail shop.
if you read his post it will make it clear why he thought a bigger TB would help, the name is like 'pcs9449', his name is Sean and he is a great mechanic to work with and always gives me little pointers as im not the most knowledgeable F-body guys this is my first
but im learning and my second question is would the 1.6RR's increase duration as well?
like if the cam card had 212-219 with the 1.5rockers would it then be 226-233 with the 1.6RR's?
If you can get a 52mm cheap (or have your's ported out by someone local for really cheap), I'd not pass it up. Though Gizmo is proof that you really don't need it, but on the flip side of that coin, how much could Giz make if he went bigger? I'm honestly interested to see that and would donate $10 (hey I'm poor) to another dyno run to see
Stock intake can take 54mm (which Profession Products sell, last I checked, on eBay). The only noticeable gain is much improved throttle response
As for the 1.6RR question, that's all dependent on what your cam card says. Here is an example of one Click Me. As you can see in the upper right corner it says "In1.65 Ex1.65" which means those .501 lift numbers are reflective of having 1.65RR.
I notice you have headers, but are you running fully stock exhaust from there back?
And what was the tuner's reasoning for the bigger TB? Do they sell one? I ask because I'm thinking it was just to get you to buy one from them
Stock intake can take 54mm (which Profession Products sell, last I checked, on eBay). The only noticeable gain is much improved throttle response
As for the 1.6RR question, that's all dependent on what your cam card says. Here is an example of one Click Me. As you can see in the upper right corner it says "In1.65 Ex1.65" which means those .501 lift numbers are reflective of having 1.65RR.
I notice you have headers, but are you running fully stock exhaust from there back?
And what was the tuner's reasoning for the bigger TB? Do they sell one? I ask because I'm thinking it was just to get you to buy one from them