Throttle body

[Kid Racer]

:|Hey guys how does a throtyle body give you more hp..I now a stock one on 3rd gen camaro are 52mm and you can buy a 58 mm but I just dont under stand. Why is a 58mm better the a 52mm...

And on intake runners I am looking to get a set of slp runners.. I have been looking at some and they say that they add more hp to, how do they add hp and all..:shock:

[black95maro]

bigger tb=more air=more power
:mrgreen:

[Kid Racer]

Okay how much more power would you say, I mean is 350 bucks worth it and what about the intake runners...

[The Fixer]

bigger tb=more air=more power
:mrgreen:

Right. However, on a TPI car, a bigger TB is not gonna give you more hp, especially on a stock motor. The stock throttlebody size can support 300hp. Even the 330hp LT4 used a stock 48mm throttlebody. Once you dig into the motor and REQUIRE more airflow (better flowing heads, more agressive cam) then the bigger throttlebody is a worthwhile investment. A heads/cam car would see a nice improvement with a 52mm TB; I put one on my car and the butt-o-meter says my ZZ4-cammed 355 needed it. A 58mm is pure overkill, unless you've got forced induction or a ridiculous cam and head combo.

The SLP runners work on the same principle. Better airflow = more power. The tubes are bigger diameter than stock, and are also siamesed at the top of the runners to aid in flow.

[Kid Racer]

okay thanks guy you have helped me alot..

[Pampered-Z]

How they work, think if an engine as a big pump, it pulls in air/fuel, ignites it, then pushes out the waste. The engine having to pull in the air and push out the exhaust takes away power that would otherwise be applied to moving the car. The more air you can more easily feed the engine, or restrictions you remove (intake track or exhaust) , the more of the power made can then be applied towards the wheels. A TB or runners help get more air into the engine, likewise headers, free flow exhaust reduce the effort to push the exhaust out. Use the old example of trying to run while breathing thru a straw, you can't run very well because you can't get enough air in or out. use a bigger the straw, you can get more air in/out. Engines work the same way.

But there is also a limit, bigger is better and too big can actually be a bad thing. Part of the process is volocity on the intake, and back pressure on the exhaust. The volicity helps keep the air flowing into the engine or scavange the cyclinders on the exhaust time. So too big actually can hurt the engines ability to make power.

Unless you have the mods = Heads/Cam/headers etc. then putting on a 58mm TB is more likely to hurt your performance. The Computer meassure the air in the intake and adjust fuel timing accordingly, also the volocity of the air moving into the intake plays a part in how the engine runs. a 58Mm Tb is really for a engine making in the 400+HP range.

That being said, on a stock internal engine a 52mm will give you a bit more power, a 58mm can actually cost you power.

Just so you know what to expect, the TB and runners will only add a slight amount of power as you are still restricted by you cam and the airflow of your heads. Don't expect a big jump in power. But those mods pay off if you do internal mods later, where the stock TB and runners would then be the restriction.

Dang TPI Monte! You beat me on my responce. I guess I took to long typing!

[Kid Racer]

So I can go with the 52 mm and a set of slp intake runners and be okay...And not loose anything like hp....Because the car has headers and exhaust already on it....

[Batman]

You may lose low end torque with the SLP runners, although they are probably the best average of the "Long runners". There is always a swap and with stock internals if you go for the higher HP of longer intake runners it can push the powerband up in the RPM range. Without a cam to go with the runners the only place you will see a noticeable gain is at the track. It will most likely be a little slower to take off ont he road.

[The Fixer]

So I can go with the 52 mm and a set of slp intake runners and be okay...And not loose anything like hp....Because the car has headers and exhaust already on it....

If you're talking about a TPI 350 car, then yes, those parts will probably help, especially if you upgrade to a bigger cam someday. I doubt they will make any difference on a 305 car; if anything, they'll hurt performance. My buddy Jay has a mostly-stock '92 TPI 305/5-speed Z28. He put a set of SLP runners on his car, and he really didn't see any improvement at the track; in fact, I think he lost a little bottom end torque because his short times were slower after installing the runners.

Dang TPI Monte! You beat me on my responce. I guess I took to long typing!

Sorry, I have speedy fingers! :burnout:

[Kid Racer]

Yeah my car has a 350 tpi in it....Okay so a cam. slp intake runners and a 52mm throttle body.....Right

[JL8Jeff]

You'd probably be better off with the Holley Stealth Ram intake and a 52mm TB. The TPI runners will limit flow. The stealth ram intake is similar to the LT1 intake. Do some research and shop around. There are different models of stealth ram for the various engines so make sure you find the right one. They pop up on Ebay a lot. Here's a good article for you.

TPI Holley Stealth Ram (http://www.gmhightechperformance.com/tech/0307htp_hollley_stealthram_intake_third_gen_iroc/index.html)

-

[edpontiac91]

I know from personal experience that the 58 mm throttle body(on a STOCK internals) will cost you about 2 tenths at the track and about 1-2 mph. I have ALL the BOLT ON goodies on my 350(SLP runners-Air Box/Edlebrock headers and intake/MSD//BORLA/Air Foil/prom chip/160 stat and more. I was running 13.9 to 14.0 @ 99 mph. After I put in the 58 mm throttle body, the car was running 14.1 to 14.2 @ 97 mph. Needless to say, in went the STOCK throttle body. You WILL need the SLP fresh air box plus a 160 degree stat and a Hypertech 160-172 degree fan switch to keep that heat sink cool. :cold:

[Kid Racer]

what is slp fresh airbox

[The Fixer]

You'd probably be better off with the Holley Stealth Ram intake and a 52mm TB. The TPI runners will limit flow.

-

Jeff is right. If you want a cam/head combo that pulls to well over 6K RPMs, the Stealthram intake manifold is the way to go. You'll trade some bottom end torque, but gain big-time upper RPM horsepower over a TPI manifold. Even modded TPI systems (bigger runners, ported plenum, bigger TB, etc.) run out of air around 5500 RPMs, so using a cam that makes peak HP above that is useless. If you decide you want a really torquey motor that won't see above 5500 RPMs, then keep the TPI and modify it with the bigger runners and TB.

[sinistr]

you can also port out your stock throttle body slightly and smooth out the bar/bracket on back of the blades to increase airflow slightly ... i cant see you needing to much more throttle body

[edpontiac91]

what is slp fresh airbox

Instead of getting your air from your stock air cleaner assembly, this unit bolts to an area(on your pass.side)right alongside of the fender. It now draws the air from an opening that runs down to the front of your lower front air dam, so that when you are moving, it pulls in fresh OUTSIDE air, and not the HOT stuff under the hood.

[Kid Racer]

oh i see

[Fast92RS]

On Camaro's IIRC the SLP kit forces you to relocate the battery to the trunk.

[NightRydaSS]

How about for an LS1 car, i have the SLP 80mm MAF, would a bigger TB inprove power? I see a lot of 90mm ones but i kno that is prob over kill on my stock internal. suggestions?

[Mike]

How about for an LS1 car, i have the SLP 80mm MAF, would a bigger TB inprove power? I see a lot of 90mm ones but i kno that is prob over kill on my stock internal. suggestions?

ported stock tb will do you good

[bubba428]

How about for an LS1 car, i have the SLP 80mm MAF, would a bigger TB inprove power? I see a lot of 90mm ones but i kno that is prob over kill on my stock internal. suggestions?

I've heard people say they lost power with the 90mm.

[NightRydaSS]

ported stock tb will do you good

about that, how do u do that?

[Batman]

How about for an LS1 car, i have the SLP 80mm MAF, would a bigger TB inprove power? I see a lot of 90mm ones but i kno that is prob over kill on my stock internal. suggestions?

A ported stocker o any of the nice 78MM T/B's is plentyfor you. A 90MM will bog your engine down so bad it will run like crap. I wouldn't recommend a 90MM on an LS1 for anything less then heads/cam set-up a forced induction car over 500 engine HP.

[Kid Racer]

Hey guys do you guys now if edelbrock makes a tb. for a tpi motor...

[Tru2Chevy]

Hey guys do you guys now if edelbrock makes a tb. for a tpi motor...

I don't know if they make one, but unless you have a big host of mods planned, you don't need one.

- Justin

[Mike]

why not check one of the million mail order sites? summit dosent have one in the catalog, they have edelbrock manifolds and bbk or summit brand throttlebodys


but im looking at the catalog and not the website so it might just have been left out

[Kid Racer]

I was asking cause my car has edelbrock on the top of each side of the tb. wich is why I was asking all I now is the car has shorty headers and exhaust...But I dont now what kind of exhaust...

[Fast92RS]

I was asking cause my car has edelbrock on the top of each side of the tb. wich is why I was asking all I now is the car has shorty headers and exhaust...But I dont now what kind of exhaust...

Chances are you already have a 52mm or 58mm throttle body on the car.

[Kid Racer]

how do i find out...

[bubba428]

caliper FTW

[Kid Racer]

whats that....

[bubba428]

its a measuring devise usually used to find the inside diameter, outside diameter or thickness of something. If you want to be all hillbilly about it measuring tape will work but won't be accurate at all

[Kid Racer]

And how much do one of them caost.....

[bubba428]

well onesn dem der caost abot $15 dependin on how goods it are

[Kid Racer]

and how do they work...

[bubba428]

well you put on tip on one side the other on the other side and read the guage

[Kid Racer]

Okay I understand thanks guys..

[Tru2Chevy]

whats that....

Caliper:
http://phoenix.phys.clemson.edu/labs/cupol/vernier/caliper.jpg

- Justin

[Fast92RS]

IIRC the way to measure your tb is to take it off and measure the opening at the back of the tb. Measure both openings.

[bubba428]

theres also ones like this that have longer tips to measure I.D. (inside diameter), and yes you have to take off the TB to measure it properly, from the back side
http://www.supplierlist.com/photo_images/7634/Digital_Caliper.jpg

[Tru2Chevy]

theres also ones like this that have longer tips to measure I.D. (inside diameter), and yes you have to take off the TB to measure it properly, from the back side

The style I posted measures inside diameter too....

- Justin

[deadtrend1]

The style I posted measures inside diameter too....

- Justin

yea, don't know how that was overlooked ....

Forgot to mention that I wouldn't put a bigger throttle body on till you need it. Hell, I'm still running the stock one on my LT1

[JL8Jeff]

Does it look like this? Edelbrock makes a twin 52mm throttle body for LT1 engines so it might work on the TPI as well. Edelbrock part # 3809.

http://performanceparts.com/performance_parts_images/edelbrock_3809.jpg

[bubba428]

The style I posted measures inside diameter too....

- Justin

I was just saying that the longer tips make it easier

[Kid Racer]

No it doesn't look like that..Im thinking it is stock and someone put edlebrock stickers on it.Im thinking the stickers came with the headers...

[johnjzjz]

some stuff like a TB you cant get a caliper into it to measure - if you know what a snap gage is and a micrometer that would be the way i would do it and the 2 barrel one pictured you just add together to get the size > now take a picture of what you think is an aftermarket part and the guys will just by seeing it will tell you what it could be - jz

[Kid Racer]

http://i88.photobucket.com/albums/k185/litlbabiboi19/64Catalina144.jpg



Okay guys here is a pic of it..Let me now what you guys think...

[Tru2Chevy]

That's a stocker with Edelbrock stickers on it.

- Justin

[deadtrend1]

wow. lol.

got a picture of your headers so we can tell you what you have there

[Kid Racer]

i will as soon as i go up and pick the car up from my dads house..in a couple of weeks....the dude said it had edelbrock shorty headers and exhaust work done on it i dont now....

[BonzoHansen]

http://i88.photobucket.com/albums/k185/litlbabiboi19/64Catalina144.jpg



Okay guys here is a pic of it..Let me now what you guys think...

Hey, that looks like the Edelbrock Stereo in my garage
http://img.photobucket.com/albums/v359/SIBLY/Cars/EdelStereo1.jpg
(RIP, it finally died, went in the trash today. It served me well...)

[bubba428]

:rofl: O DAMN thats thing is rare as hell :lol:

[BonzoHansen]

:rofl: O DAMN thats thing is rare as hell :lol:

Better hurry up, it's going fast. My curb right now for tomorrow's trash pickp:
http://img141.imageshack.us/img141/582/img4424ot7.th.jpg (http://img141.imageshack.us/my.php?image=img4424ot7.jpg)

For extra credit, what exactly is the amp sitting next to?

[The Fixer]

For extra credit, what exactly is the amp sitting next to?

4th Gen doorskin?

[BonzoHansen]

4th Gen doorskin?

That is 1/2 right.

Edit: damn, copper must be like gold. Someone came by and cut the power cord off that amp and left the amp. LOL.

[deadtrend1]

That is 1/2 right.

Edit: damn, copper must be like gold. Someone came by and cut the power cord off that amp and left the amp. LOL.

Copper is worth a pretty penny at the moment. My old man had a technics and kenwood tubed radio until both kick the bucket a year or two ago.

Oh, and way to Hijack this thread, Bozo!!! :moon:

[BonzoHansen]

Copper is worth a pretty penny at the moment. My old man had a technics and kenwood tubed radio until both kick the bucket a year or two ago.

Oh, and way to Hijack this thread, Bozo!!! :moon:

LOL, this thread went down the crapper a while ago. Besides, the Edelbrock sticker ties it all together.

BTW, Bubba, stop it.

[PolarBear]

Stock TPI throttle body is 48mm BTW not 52