Which TB with JPC manifold?

[JeremyH]

The stock throttle body is fine, before I started worrying about that; id worry about that Precision turbo.

Just sayin...

Double fail. Do you have any tech to add besides the stock tb is fine? WTF does that mean anyway.
Also, arent you running a 5.4 jpc intake, are you using a stock gt tb or a stock gt500 tb?

Im not worried about the stock tb, that thing became a paper weight over 2 years ago lol

Definetly nothing wrong with precision turbo industries, top notch company and make great turbo's.

 

[eng943]

Boy, this is going to be an expensive winter. I want to back off the boost a little and go up a pulley size to maybe knock it down to 23-24lbs.

This will be 2k+ worth of mods when I'm done.

 

[JeremyH]

Boy, this is going to be an expensive winter. I want to back off the boost a little and go up a pulley size to maybe knock it down to 23-24lbs.

This will be 2k+ worth of mods when I'm done.

I hear ya! lol

What boost are you running now?

I finally just made it to my 600rwhp goal at just under 15lbs of boost.

I need some new 02 sensors then maybe eventually go for 650rwhp at 17-18 lbs.

 

[eng943]

I hear ya! lol

What boost are you running now?

I finally just made it to my 600rwhp goal at just under 15lbs of boost.

I need some new 02 sensors then maybe eventually go for 650rwhp at 17-18 lbs.

26lbs of boost...a bit more than I wanted. Plan on 80lb injectors and at least a BAP for the GT500 fuel system at 650.

We had to set my rev limiter to 6k rpm and go with a pretty soft tune with the boost I'm running due to being out of injector and fuel pump at 663whp.

I should see 700whp with added fuel, JPC and meth even I dial the boost back a couple pounds.

 

[JeremyH]

26lbs of boost...a bit more than I wanted. Plan on 80lb injectors and at least a BAP for the GT500 fuel system at 650.

We had to set my rev limiter to 6k rpm and go with a pretty soft tune with the boost I'm running due to being out of injector and fuel pump at 663whp.

I should see 700whp with added fuel, JPC and meth even I dial the boost back a couple pounds.

Wow, yeah thats alot of boost! those ysi's sure move some air!

What injectors you have now?

I just added a single 40amp bap to my setup. I have 2 gt40 pumps on the stock hat with the single fpdm. At 540rwhp no bap i was at 80% dc, at 560rwhp with the bap the pumps were at 62% and at 600rwhp was at 70% with 62lb injectors. Im very happy with how my fuel setup is doing right now.

 

[eng943]

Wow, yeah thats alot of boost! those ysi's sure move some air!

What injectors you have now?

I just added a single 40amp bap to my setup. I have 2 gt40 pumps on the stock hat with the single fpdm. At 540rwhp no bap i was at 80% dc, at 560rwhp with the bap the pumps were at 62% and at 600rwhp was at 70% with 62lb injectors. Im very happy with how my fuel setup is doing right now.

60's right now. When I buy the 80's I want to look for a matched set. Tuning was a headache with the 60's.

 

[white05gt]

Theres also isnt much power to be made over the stock manifold with the jpc intake on a stock block at 10 psi either.

Just curious, do you have your dyno #'s for this or you just talking shit??? I want to hear where you got your said info lol.

Did these few shops/tuners reccomened a JPC intake for your setup instead of said tb? cha-ching$$$ lol

Nope, I chose to go with it. It will work great for what I have planned.

I think it's funny you talk shit but you have one of the slowest 540hp cars. You crack me up with your dyno numbers, do you just have a little notebook filled with your dyno numbers that you swear by?

 

[JeremyH]

60's right now. When I buy the 80's I want to look for a matched set. Tuning was a headache with the 60's.

Gotcha, well you are getting close to the threshold of those 60's anyways, well good luck, love to see how it turns out.

 

[06silverbullet]

Just curious, do you have your dyno #'s for this or you just talking shit??? I want to hear where you got your said info lol.



Nope, I chose to go with it. It will work great for what I have planned.

I think it's funny you talk shit but you have one of the slowest 540hp cars. You crack me up with your dyno numbers, do you just have a little notebook filled with your dyno numbers that you swear by?

 

[JeremyH]

Just curious, do you have your dyno #'s for this or you just talking shit??? I want to hear where you got your said info lol.



Nope, I chose to go with it. It will work great for what I have planned.

I think it's funny you talk shit but you have one of the slowest 540hp cars. You crack me up with your dyno numbers, do you just have a little notebook filled with your dyno numbers that you swear by?

Someones a little hurt, you crack me up as well!

Lol, yeah man you got me, i just made all this stuff up and keep it in a little notebook.

I dont talk shit man, just state facts from testing ive seen and opinions based on that.

I just think its funny that you see no need to upgrade the stock tb, but bought the most exspensive intake manifold out there, thats desgined for high boots/high hp cars.

Just trying to understand your logic there, and maybe you could have some tech related info to add rather than just attack me and try to hurt my feelings or something.

The JPC 3-valve intake manifold is cast from A356 aluminum, and the throttle and lower flanges are both machined 6061-T6 aluminum. The thick aluminum construction is designed for high horsepower applications that either completely tax the airflow potential of the stock manifold, or shatter the weak plastic stock manifold with too much pressure from boost or nitrous.

 

[white05gt]

I hate to break it to you, my feelings aren't hurt. Since you are big on dyno #'s, do some searching and you will see good gains at 10-12 psi. The intake may be the most expensive but I didn't have to wait for revisions or worry about whether FRPP's intake will hold together at high boost. It is the most expensive because their is a lot of labor that goes into making one and the quality is top notch.

Op, best thing to do is call JPC and see what they recommend for your setup since your running their intake. I have talked to Justin and Tommy a few times and they took the time to answer my questions. After buying my intake, Justin called me to give me some info and tips for installing the intake. IMO, someone like him willing to take the time to call customers says a lot, some shops won't even return a phone call.

 

[klaw]

I believe that centri's and turbos (blow through) will show less relative gain with TB's and intakes because they are already on the high pressure side and the velocities (friction/drag) are lower for the same air mass flowrate.

 

[SteveP]

I've been running the stock tb with my jpc intake. No issues. I came across a FRPP one so i will be swapping to that this week. Not looking for any gains though. It is nice that Accufab makes the FRPP ones too.

 

[Towelly]

I believe that centri's and turbos (blow through) will show less relative gain with TB's and intakes because they are already on the high pressure side and the velocities (friction/drag) are lower for the same air mass flowrate.

This is true. But why leave anything on the table when you spending this much on a intake? I agree with lightblade. Why not just poney up for a TB that is matched to the size of the inlet on the intake? Makes good sense to me.

 

[klaw]

This is true. But why leave anything on the table when you spending this much on a intake? I agree with lightblade. Why not just poney up for a TB that is matched to the size of the inlet on the intake? Makes good sense to me.

A larger TB can in some cases lead to driveability/tune issues that aren't worth the gains. For a street car or even a street/strip car, alot of time is spent at tip-in and part throttle rather than WOT. It's not only the cost of the TB - it might mean extra time and cost in tuning or less enjoyment of the car on the street. Bigger isn't always better and a good understanding of the costs and performance tradeoffs in any build can maybe help avoid unanticipated consequences.

 

[Cobra SS]

L&M twin 62mm, driveability is perfect
http://store.jpcracing.com/LampM-Dual-Bore-Throttle-Bodies_p_505.html

 

[eng943]

I believe that centri's and turbos (blow through) will show less relative gain with TB's and intakes because they are already on the high pressure side and the velocities (friction/drag) are lower for the same air mass flowrate.

Agreed. At the level I am at with around 25psi of boost and 650+ it begins to make sense to me to run an aftermarket intake. According to what I have seen with other centri applications, I may only see 30-40 whp.

However, running meth injection is half the reason for moving to the JPC. Seems to me the JPC will do a better job of distibuting the meth more evenly to all the cylinders.

 

[silverpoison]

For turbo and centrifugals I would go with the standard bore tb......just my opinion...

 

[GI Joe]

I used the FRPP T/B with the JPC intake to answer your original question

 

[JeremyH]

A larger TB can in some cases lead to driveability/tune issues that aren't worth the gains. For a street car or even a street/strip car, alot of time is spent at tip-in and part throttle rather than WOT. It's not only the cost of the TB - it might mean extra time and cost in tuning or less enjoyment of the car on the street. Bigger isn't always better and a good understanding of the costs and performance tradeoffs in any build can maybe help avoid unanticipated consequences.

The 62mm tb's boast little to no tuning and stock driveability...

And we are really not talking bigger here, its more just matching the stock/aftermarket manifolds sizes to the tb size. Ford knew what they were doing when they made the manifold bigger than the throttle body opening, $ for them to make on aftermarket upgrades.

I hate to break it to you, my feelings aren't hurt. Since you are big on dyno #'s, do some searching and you will see good gains at 10-12 psi. The intake may be the most expensive but I didn't have to wait for revisions or worry about whether FRPP's intake will hold together at high boost. It is the most expensive because their is a lot of labor that goes into making one and the quality is top notch.

Op, best thing to do is call JPC and see what they recommend for your setup since your running their intake. I have talked to Justin and Tommy a few times and they took the time to answer my questions. After buying my intake, Justin called me to give me some info and tips for installing the intake. IMO, someone like him willing to take the time to call customers says a lot, some shops won't even return a phone call.

I did do some searching and saw that on the 10 psi stock long block average setup gains were small and it mostly moved the peak curve to the right with the jpc intake, which makes sense since thats not what its designed for. And as the same for the other intakes can be argued that its due mostly to the cmc deletes. I do agree its a nice, well made piece and should work nicely if you ever build the block up and up the boost. My point is at your level the stock manifold with deletes and a port matched tb would show the same if not more gains than the jpc intake for alot less $. I agree calling jpc is great idea, straight from the horses mouth.

I still wonder how you think a bigger than stock tb wont have gains due to others reccommendations, yet decided on your own that a racing intake manifold was a good investment at your power level. That money could have went towards some forged internals! Just my opinion man, not trying to piss you off.