28 replies to this topic

[Snabb T5M]

Ok, so I've seen in several posts some members who are building turbo motors and they are using a NA cam on the exhaust side, and I think 1 or 2 members are using a NA throttle body (is it bigger than the turbo version). Are there other members out there that have already done this and are currently driving the cars around with these mods? Does it make a difference?

I've been seriously contemplating switching my T5 exhaust side cam for the NA cam, and for years thought about getting a bigger throttle body. Are the benefits worth it, or is it only worth it for a really built motor like the Peril or others putting out over 450hp?

[BlackT5]

I am running NA cams and TB. Hard to tell what difference it made since I upgraded so many other things at the same time.

For the TB, it is 68mm instead of the 58mm turbo one. I used the larger NA one so it wouldn't be a bottle neck with the 2.5" turbo outlet and 2.5" IC piping.

[mdlimy]

as for the cams....

[Snabb T5M]

Explain please.

mdlimy5, on 25 August 2009 - 04:50 PM, said:

as for the cams....

[mdlimy]

leroystew, on 25 August 2009 - 04:52 PM, said:

Explain please.

this topic has been beaten to death, no one has a real definite solid answers as to how much gain and what exact gain you get out of cams, or whether or not to use one or both cams.
We are waiting for a before and after dyno with tune tweaking specific to the cams, i will be doing this when my motor is complete but it wont be for a few months.

[Snabb T5M]

Ok, gotcha. guess we can put this discussion to rest then.

mdlimy5, on 25 August 2009 - 05:05 PM, said:

this topic has been beaten to death, no one has a real definite solid answers as to how much gain and what exact gain you get out of cams, or whether or not to use one or both cams.
We are waiting for a before and after dyno with tune tweaking specific to the cams, i will be doing this when my motor is complete but it wont be for a few months.

[johnloves850's]

from what i have heard...
the n/a cams give you kill low end and give a little top end
someone correct me if i have heard wrong

[Snabb T5M]

I was looking in FCPGroton for the NA throttle body and couldn't find one. Do you have a part number for it please or a link where to order?

BlackT5, on 25 August 2009 - 03:43 PM, said:

I am running NA cams and TB. Hard to tell what difference it made since I upgraded so many other things at the same time.

For the TB, it is 68mm instead of the 58mm turbo one. I used the larger NA one so it wouldn't be a bottle neck with the 2.5" turbo outlet and 2.5" IC piping.

[BlackT5]

Grab one from a junkyard, or look in the for sale section. I bought mine for $20 from a member here.

[johnloves850's]

BlackT5, on 26 August 2009 - 04:41 PM, said:

Grab one from a junkyard, or look in the for sale section. I bought mine for $20 from a member here.

25 to my door, tom's foreign auto on ebay

[Snabb T5M]

Thanks, found the seller on Ebay.

So are the throttle bodies different between a manual and auto tranny (assuming so since they are specified as manual or auto)? And I'm assuming I will need an IC transition hose to mount the IC to the new, bigger throttle body. Would I need a 2.25" to 2.5" transition hose piece.

johnloves850's, on 27 August 2009 - 04:31 AM, said:

25 to my door, tom's foreign auto on ebay

[Snabb T5M]

Please a little help before I buy.

leroystew, on 27 August 2009 - 01:18 PM, said:

Thanks, found the seller on Ebay.

So are the throttle bodies different between a manual and auto tranny? And I'm assuming I will need an IC transition hose to mount the IC to the new, bigger throttle body. Would I need a 2.25" to 2.5" transition hose piece.

[volvotech97850]

You'll need a new hose. Because I have bigger pipes, i went with a 90 degree bend - 2.5" to 3" at the throttle body. Problem is, you eliminate the hose going to the idle control valve that the OEM coupler has integrated. I got a 1" nipple welded on to the pipe and ran a hose from there to the valve. Hopefully not the hardest mod you do.

Also, the intake needs to be bored out to utilize the bigger throttle body, unless you want to make a spacer.

[johnloves850's]

leroystew, on 27 August 2009 - 01:18 PM, said:

Thanks, found the seller on Ebay.

So are the throttle bodies different between a manual and auto tranny (assuming so since they are specified as manual or auto)? And I'm assuming I will need an intercooler transition hose to mount the intercooler to the new, bigger throttle body. Would I need a 2.25" to 2.5" transition hose piece.

no difference between auto and manual
you'll need a bigger hose, or some kind of modded coupler to incorporate the tps
there was a group buy a while ago, but idk what became of that
60 bucks iirc, not too shabby for saving yourself some man hours trying to make one haha

[laird]

The larger TB is a questionable mod. At a minimum, it goofs up your cruise control by causing surges. It is a pain to hook up and you will likely end up with two more hose clamps and some home brew transition. I blew my TB hose off about a dozen times before I finally got a good setup. You will also need to bore out the Intake Manifold to accommodate the larger throttle plate. I used it for a while and took it off with no obvious difference in get up and go. It mostly changes throttle response off idle. That may appeal to you and may feel snappier but I don't think there is any gain in actual flat out acceleration. There is a lot of "I think" and such here so take it for what it is worth. If I could find a bored turbo throttle body, I would probably try that. It would allow use of the factory plumbing which is for me, the biggest drawback to the mod.
Let me know how the cams go though, I have been sitting on a set of NA cams for a while now.

[dublin14]

laird, on 02 September 2009 - 01:32 PM, said:

The larger TB is a questionable mod. At a minimum, it goofs up your cruise control by causing surges. It is a pain to hook up and you will likely end up with two more hose clamps and some home brew transition. I blew my TB hose off about a dozen times before I finally got a good setup. You will also need to bore out the Intake Manifold to accommodate the larger throttle plate. I used it for a while and took it off with no obvious difference in get up and go. It mostly changes throttle response off idle. That may appeal to you and may feel snappier but I don't think there is any gain in actual flat out acceleration. There is a lot of "I think" and such here so take it for what it is worth. If I could find a bored turbo throttle body, I would probably try that. It would allow use of the factory plumbing which is for me, the biggest drawback to the mod.
Let me know how the cams go though, I have been sitting on a set of NA cams for a while now.

Ok, how is it a mustang gets 10-15 hp with just a bigger TB but we from what being said. not much? I have a NA TB with a 960 plate waiting to go on but now i dont know if its worth it. I love my car, but hate that there so hard to make decent power.

[laird]

dublin14, on 03 September 2009 - 11:39 AM, said:

Ok, how is it a mustang gets 10-15 hp with just a bigger TB but we from what being said. not much? I have a NA TB with a 960 plate waiting to go on but now i dont know if its worth it. I love my car, but hate that there so hard to make decent power.

I don't know about Mustangs. Maybe they are like the K&N filter that gives you 14 Hp.
It is not brain surgery to install so give it a try,

[dublin14]

laird, on 03 September 2009 - 01:39 PM, said:

I don't know about Mustangs. Maybe they are like the K&N filter that gives you 14 Hp.
It is not brain surgery to install so give it a try,

If what you say is true, it makes me wonder if its worth the hassle?

[Boost_Junky]

Difference is NA vs forced induction.

There are also different characteristics to the intake manifold and head.

[the commissar!]

laird, on 02 September 2009 - 01:32 PM, said:

The larger TB is a questionable mod. At a minimum, it goofs up your cruise control by causing surges. It is a pain to hook up and you will likely end up with two more hose clamps and some home brew transition. I blew my TB hose off about a dozen times before I finally got a good setup. You will also need to bore out the Intake Manifold to accommodate the larger throttle plate. I used it for a while and took it off with no obvious difference in get up and go. It mostly changes throttle response off idle. That may appeal to you and may feel snappier but I don't think there is any gain in actual flat out acceleration. There is a lot of "I think" and such here so take it for what it is worth. If I could find a bored turbo throttle body, I would probably try that. It would allow use of the factory plumbing which is for me, the biggest drawback to the mod.
Let me know how the cams go though, I have been sitting on a set of NA cams for a while now.

Please explain...what in the turbo TB are you boreing?