wut is the diff between the stock throttle body and the evo?

 

It's polished and bored out.

 

yeap see pic in my sig. it's for sale btw for $800 shipped, would be $1015 + shipping brand new from 350evo.

 

How much would it have cost you if you sent back the core?

 

$265.00 350EVO + $750 OEM + shipping = $1015 + shipping

 

But since you can't use both at once, buying from EVO costs 265 and you send your stock one to them when you put theirs on. You are out 265 and you don't have to find a metal bin for your stock piece!

 

What does the new throttle body do? Or...... what does the throttle body do anyway? Sorry, I really don't know......
And is it a stand alone mod? Don't need to touch ECU?

 

I don't know alot about this one in particular, but most throttle body updgrades include a larger throttle body than stock...allowing more air into the plenum....and they are usually polished or designed to create better air flow as well.

 

3 questions:

1. While 350evo documents a 3-5 HP increase at top RPM, is there a graph that shows the gains/loses for the entire curve?
2. Do the thinner walls of the TB run the risk of FI guys blowing their TB? I know that downshift runs N/A, but have these units been stress tested beyond a N/A application?
3. Not technical, but why is the charge so drastic of an unreturned core? It seems to be above and beyond the cost of purchasing a new core? This isn't really important, but a simple curiousity.

 

This one I'm selling is primarly for those who like to keep their stock parts.

 

Mike Wazowski:

Any particular reason why you are selling yours?

 

Frenzy -

I'm not sure about the first question, but the bore is a matter of millimeters and should not affect the integrity of the part in a FI application. The amount of force on the throttle body walls is not so high as to cause it to explode.

The answer to question 3 is: The fine people at Nissan charge $650 for an OEM throttle body. Therefore, if you don't send yours back to Evo, they need to buy another instead of modifying yours and sending yours out to their next customer.

Dan

 

Also, when installing a bored out TB, you will need to bore out the plenum opening as well to match up with the larger TB opening. If you don't do this, then you pretty much negate the potential gains of the mod.

 

You won't exactly negate the gains, but you will see greater composite gains if you do both. Think of the intake flow in similarity to the exhaust flow. There are multiple parts to the exhaust. Increasing the flow of just one piece (such as headers) shows an increase in gains. Increase the flow of the cats and you see specific gains for that as well. Now, if you increase the flow of all peices, you should show a larger percentage gain all around. The sum of each piece is less than the output of the whole, but the pieces still show gains individually.

 

1. a crawford plenum with an input bore to match that of the 350evo TB
2. a 350evo TB
3. an identical diameter hybrid intake pipe (not a cai), that was polished, but had an outer chamber to insulate the internal air
4. a JWT pop charger
5. and just for kicks, the TS flash tuned to a perfect A/F ratio.

I bet one would see considerable gians from a setup like this.

 

Maybe, but I doubt we'll ever see that. I'm not sure if Evo did this, but some companies taper the bore of the throttle body slightly to increase the velocity of the intake charge. If that is the case, the boring out of the plenum would not be too beneficial.

 

You're right. I stand corrected .

 

wouldnt the gains be of a greater percentage if your running FI?

 

I called EVO and asked if they did a bench flow rate on there TB.....to see how much more air did go through it .THERE reply..........NO...they did not do a bench flow on it .Makes me wonder...wouldnt it you

 

Correct. Running N/A, you might see a gain of x for one part within the intake system. Running FI, you would probably see a percentage gain above x for adding the same part to an already existing FI setup.