throttle body ???????????????????s
02-12-2009, 10:07 PM
#1
Thread Starter
Join Date: Nov 2008
Location: mass
Posts: 14
throttle body ???????????????????s
ok took my stock tb off and put 75 mm on with spacer and lost power 2nd and 3rd would get loose just rolling on the throttle not anymore why is it just to much got it for free so no loss works good iac is new no emissions still have the egr on and plugged in also what if i put my orgnl spacer back on trick flow street cold air 19# man motor is 5k miles old
02-13-2009, 12:03 AM
#2
3rd Gear Member
Join Date: Nov 2006
Location: PA
Posts: 823
Please learn to use punctuation... or at least periods so we don't have to guess where each sentence ends and a new one begins. If you edit your post so it's readable and add some info about the engine, cam, heads, intake, etc. then we might be able to help you with your problem.
02-13-2009, 05:20 AM
#3
Thread Starter
Join Date: Nov 2008
Location: mass
Posts: 14
why would i loose power ?. engine has trick flow intake ,cold air,manual,19#ers,underdrive,30over, decked, afr heads . now with my old throttle i could just roll on the throttle in 2nd and 3rd and the *** would get loose (spin tires). now with a 75mm and matched spacer i lost that power. would i see a difference if i put the stock egr spacer on? hey capri sorry im no typer any ideas? ohh thats all i know of engine
02-13-2009, 06:04 AM
#4
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Join Date: Jul 2008
Location: Burnt Hills, NY
Posts: 15,601
...Why a 75mm TB??? ...bigger not better in all case's...I was making 625hp with my '91 GT and I was running a 70mm TB...
If you had a stock TB, I would have put on a 65mm TB MAX!!! What's your combo?
If you had a stock TB, I would have put on a 65mm TB MAX!!! What's your combo?
02-13-2009, 08:47 AM
#5
3rd Gear Member
Join Date: Nov 2006
Location: PA
Posts: 823
I have the TrickFlow intake on my car with a 70mm TB because that's what TF told me use. I never measured the intake bore diameter, it may only be 70mm. So if you put a 75mm TB on a 70mm intake bore, it will have a ridge where the two parts meet that could be causing turbulance. Anyone here know what the TF intake bores inside diameter measures, because I'm not pulling mine apart to check. LOL.
Or...
Maybe the intake bore is bigger than the bore of your TB and now you're getting substantially more air, but the 19# injectors you have might not be enough... TrickFlow says 24# should be used.
Or...
Maybe the intake bore is bigger than the bore of your TB and now you're getting substantially more air, but the 19# injectors you have might not be enough... TrickFlow says 24# should be used.
02-13-2009, 07:07 PM
#7
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
why would i loose power ?. engine has trick flow intake ,cold air,manual,19#ers,underdrive,30over, decked, afr heads . now with my old throttle i could just roll on the throttle in 2nd and 3rd and the *** would get loose (spin tires). now with a 75mm and matched spacer i lost that power. would i see a difference if i put the stock egr spacer on? hey capri sorry im no typer any ideas? ohh thats all i know of engine
Have you checked if there's something else that could be causing a problem?.....you have increased airflow into the engine, wouldn't it need more fuel?.... you are
measuring power based on the ability to spin tires, what about some ET numbers. You don't get from point A to B faster spinning tires. Just a thought.
02-13-2009, 08:04 PM
#8
As stated, the larger diameter is the problem, you're loosing power due to too much air inflow, yes there is such a thing. Basically the engine is loosing pressure in the intakes due to the added airflow. Think of it as sucking through a straw. A larger straw sucks better than a smaller, but you'll reach a certain point where it's not more effecient because you're having to suck harder to build up enough pressure to move the liquid into your mouth, same goes for intakes. You should be no larger than 70mm without a power adder.
02-13-2009, 08:29 PM
#9
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
As stated, the larger diameter is the problem, you're loosing power due to too much air inflow, yes there is such a thing. Basically the engine is loosing pressure in the intakes due to the added airflow. Think of it as sucking through a straw. A larger straw sucks better than a smaller, but you'll reach a certain point where it's not more effecient because you're having to suck harder to build up enough pressure to move the liquid into your mouth, same goes for intakes. You should be no larger than 70mm without a power adder.
... I have set speed density N/A setups with a 80mm TB.... the problem is not the TB. Instead of limiting airflow, he should be upgrading/correcting the fuel side.
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