Throttle Bodies V6 vs Hemi

[rwalshphoto]

Has anyone ever considered swapping out the throttle bodies from a 3.5L with a larger throttle body or possibly boring it out? Possibly the 4.0 jeep one or something? Would it be worth the gains? How worse would the gas mileage be etc?

[rwalshphoto]

WOW, 46 views and not 1 reply??? BUMP

[Batman]

I'll help a brotha out with a reply, but I don't have an answer for you. Hope you find it though?!

[rwalshphoto]

I'll help a brotha out with a reply, but I don't have an answer for you. Hope you find it though?!

Dude, I am SOOOOO looking forward to The Dark Knight!!!!

[mfkbmagnum]

Do not know if it is possible or what the effects would be. I would suspect that on a stock engine you wouldn't notice a difference in performance.

[Batman]

Dude, I am SOOOOO looking forward to The Dark Knight!!!!

As Dan Akroyd once siad, "I’m so loaded with anticipation that my genitals have sucked up into my body cavity".

Don't get him started......

[TCPMeta]

The LH platform has a 68mm TB stock and a bunch of people have bored them to 70mm and used the TB plate from Holley. There is some what of a gain but not much but if you add a 3/8inch intake spacer between the plenum and upper manifold there is a big increase of torque.

[Samoan Tsunami]

Has anyone ever considered swapping out the throttle bodies from a 3.5L with a larger throttle body or possibly boring it out? Possibly the 4.0 jeep one or something? Would it be worth the gains? How worse would the gas mileage be etc?

well whats the point if you are NOT modifying internals to the engine?


thing is, the black intake manifolds on the v6's we have....have two valves. one valve opens up at higher rpms to allow more air. this is the difference you hear when accelerating. its a dual tuned manifold.

the TB we have is basically tuned to the manifold, cam, basically the entire intake side we have. keeps low end power, but also allows for top end power.

adding a larger TB to a stock engine thats not exactly starving for air slows the intake velocity which can decrease power. if we had cams or some sort of head work, then it would be a decent option, after a decent amount of headwork has been done, but always remember. its an air pump. try to keep it efficient as possible. slowing air flow speeds usually decreases efficiency and power output.

[rwalshphoto]

well whats the point if you are NOT modifying internals to the engine?


thing is, the black intake manifolds on the v6's we have....have two valves. one valve opens up at higher rpms to allow more air. this is the difference you hear when accelerating. its a dual tuned manifold.

the TB we have is basically tuned to the manifold, cam, basically the entire intake side we have. keeps low end power, but also allows for top end power.

adding a larger TB to a stock engine thats not exactly starving for air slows the intake velocity which can decrease power. if we had cams or some sort of head work, then it would be a decent option, after a decent amount of headwork has been done, but always remember. its an air pump. try to keep it efficient as possible. slowing air flow speeds usually decreases efficiency and power output.

Couldnt have asked for a more detailed response, beans for youThe only reason I havent planned to do work on the internals is because no one seems to make anything for our engines yet. And without tried and true testing I would really hesitate to just pull off the manifold and heads and take it to a machine shop. Then there is always the mighty dollar or lack there of.

[DannyC]

thing is, the black intake manifolds on the v6's we have....have two valves. one valve opens up at higher rpms to allow more air. this is the difference you hear when accelerating. its a dual tuned manifold.

the TB we have is basically tuned to the manifold, cam, basically the entire intake side we have. keeps low end power, but also allows for top end power.

adding a larger TB to a stock engine thats not exactly starving for air slows the intake velocity which can decrease power. if we had cams or some sort of head work, then it would be a decent option, after a decent amount of headwork has been done, but always remember. its an air pump. try to keep it efficient as possible. slowing air flow speeds usually decreases efficiency and power output.

Ok this is new news. I didn't know we had a 2 stage intake. Is this what I feel @4000 rpm? Feels like 2 more cylinders kicking in. Maybe if we could just get the high speed valve to open sooner we'd get more power at lower rpms?

[rwalshphoto]

Ok this is new news. I didn't know we had a 2 stage intake. Is this what I feel @4000 rpm? Feels like 2 more cylinders kicking in. Maybe if we could just get the high speed valve to open sooner we'd get more power at lower rpms?

Maybe that will happen with a tuner!! C'mon Diablo

[DannyC]

I'm not holding my breath on Diablo :D But if our intakes do infact have a 2 stage system there should be some way to get it to open sooner. The only problem is, it's probably controlled electronically and that could be tricky. I am not knowledgable enough to come up with a mod if it is electronic but I know we have some smart people here. Man if that puppy would open at 3300-3500 mine would be a screamer!

[Samoan Tsunami]

Ok this is new news. I didn't know we had a 2 stage intake. Is this what I feel @4000 rpm? Feels like 2 more cylinders kicking in. Maybe if we could just get the high speed valve to open sooner we'd get more power at lower rpms?

i'm not sure at what speed it opens on the (MTV - Manifold Tuning Valve), the SRV is above 5g i know that... but those "black boxes" on the front of our engines...those are the controllers. heres a scan from the shop manual


basically, the short runner valve works as stated:

SHORT RUNNER VALVE
OPERATION
The SRV system operates under WOT conditions above 5000 rpm to maximize engine performance. When actuated
by the PCM, the SRV solenoid energizes, allowing mechanical linkage to redirect the intake air flow to six short
runners. The PCM looks for a current spike when actuating the solenoid. If the spike is not present, the PCM sets
the DTC.

thats the valve controlled to the right. when standing in front of the car and looking at it head on.

the one to the left is the manifold tuning valve.


so basically we get a low and a high. the short runner setup is similar to the design that goes into short ram intakes and long ram intakes that are available on the market. the same ideas are simply used for our manifold.

[Samoan Tsunami]

I'm not holding my breath on Diablo :D But if our intakes do infact have a 2 stage system there should be some way to get it to open sooner. The only problem is, it's probably controlled electronically and that could be tricky. I am not knowledgable enough to come up with a mod if it is electronic but I know we have some smart people here. Man if that puppy would open at 3300-3500 mine would be a screamer!

it has the potential to be a screamer, but it all depends on the valve, how much air is being flowed, how much fuel set at "per RPM" to support the extra air, and how well our cam is designed in stock form. remember with custom tuning, you control everything. so theres a way to compensate with most programs. but if there isnt and its more a linear style of tuning like the jet module, or the ebay alleged chips, which basically end up being resistors that multiply a value the same amount for every rpm range... having excess air flow without more spark or fuel can make it A) fall on its face or have a plateau for that part of the powerband.... or worse, like the jet module has shown in a few dyno sheets, to actually LOSE POWER.

may wanna check with BG tuning sold by HHP. they do custom tunes on stock computers.

[MidnightSXT]

Damn I always thought those two black boxes up front were part of the ignition system. I guess you can say this 2 stage intake is kinda like having a 4 barrel carb....extra runners open up like secondary throttle does to a 4 barrel.