BIG throttle body for Titan

BassTow · 08-28-2006, 12:46 AM

O.K. gearheads, here's a possible retrofit opportunity for the Titan. Question is, what would it take to make this 90mm Infiniti Q45 throttle body work on the Titan (70mm)?

Here's the auction for the item in the attached TB pic;
http://cgi.ebay.com/ebaymotors/Infin...QQcmdZViewItem

Here is the way to search to see these TB's on ebay;
eBay Motors> Parts & Accessories> Car & Truck Parts> Air Intake & Fuel Delivery> Throttle Body> Search Results for 'infiniti Q45'

Don't know if this address will work or not since it may involve my ID??
http://motors.search-desc.ebay.com/i...MEFSRCHQ3aSRCH

If the bolt spacing is different an adapter plate might be required for mounting to the intake, but would think someone can get the exact specs or excellent pics of this Infiniti TB vs. Titan TB to see what could be done to physically get this 90mm TB to fit the Titan. Other considerations are the vacuum/air fittings and the especially if the TPS connector harness will be the same (if not the pin-out specs would be needed.

SoBeGraphics · 08-28-2006, 02:40 PM

Extremely VERY Interesting.

I hope one of the gear heads can figure this one out.

dawgs77 · 08-28-2006, 04:11 PM

I wonder if the new QX56 TB's are any bigger then the Titan....same motor so it should fit just fine as long as it's the same volt signal.

**konigfritz** · 08-28-2006, 05:10 PM

It may work! the 5.6 is a bored and stroked version of the 4.5. Very interesting!

ORTitan · 08-28-2006, 06:41 PM

They would first have to be modified for the cable-less throttle plate actuator that our trucks use. Machining up an adapter/spacer for the manifold would be the easy part.

Brundy · 08-28-2006, 06:48 PM

Maybe try pm'ing titanengineer about it.

BassTow · 08-28-2006, 06:56 PM

I'm thinking this 90mm throttle body could be retrofitted rather easily by someone with moderate engine experience. Getting whatever information for BOTH the Q45 Infiniti (car) and Titan from someone with access could make this mod much easier to plan for; we need physical dimensions, part numbers, pics, drawings, schematics, any known problems, clearance issues, etc... of throttle body assemblies, intake manifolds, any available TPS components of the TB assembly. Probably different harness connections so Pin-out specs of the harnesses could be useful as well.

I'm doing this mod if I can get some good info to help get me started, or I find the data myself. Just think about having a 4"+ inside diameter intake tube with a big K&N cone filter on the end feeding air to this 90 mm throttle body. To get any better air flow in, a person would then have to do intake work. Not me, I'm ready to take this project on...probably best to call this "Hillbilly Volant Stage II".

dawgs77 · 08-28-2006, 06:59 PM

Also...that is off a 1990??? Q45. I'd want to see what the new ones are bored too.....also...the QX56 that rates higher HP then the Titan....if it's bored over it should be a direct bolt on.

BassTow · 08-28-2006, 07:33 PM

Don't know what the later model Q45 TB's were like but maybe somebody does???

The throttle body is same for QX56 and Titan, ecu bumps the curves different, maybe head/piston/cam difference for big bumps (like Z car), typical for all of NNA's engine platforms.

vegashd · 08-29-2006, 09:29 AM

I personally think everyone is barking up the wrong tree here. Performance vehicles all around use a little smaller throttle body then most expect as the air increases inspeed it can actually deliver for air/fuel.

I think 20mm is a HUGE difference and the Titan would starve for air and fuel

Blindside1234 · 08-29-2006, 10:36 AM

parond me if im wrong but if your intake manifold is still 70MM wont that restrict airflow just as much as having the stock TB. 90MM going into 70MM Intake manifold? might have to get the manny ported and polished while your at it

RB's Titan · 08-29-2006, 10:39 AM

Well I'd say that I wish you lots of luck in what I woudl call a difficult task.

I'd much rather see us concentrate on a new intake than TB.

BassTow · 08-29-2006, 11:05 PM

I'm just interested in getting the maximum amount of airflow into the collector (which can't be modified since it is injection molded). As long as the transition from the 90mm TB to the collector opening is smooth and shaped to promote laminar air flow then the collector will get as much air as it can handle and the goal will be attained.

Don't know if a later year model infiniti/nissan throttle body that is driven "by wire" like our Titans would be easier to retrofit as long as it is significantly larger than our current TB. A "smooth transition" spacer adaptor plate and the intake pipe/filter to supply cold air is pretty straightforward and plans for these can be finalized once a BIG TB is identified to work with.

There's a lot of really good people on this forum that can probably help so I'll keep bumping this along...

20Titan05 · 08-30-2006, 08:40 AM

Quote:

Originally Posted by konigfritz

It may work! the 5.6 is a bored and stroked version of the 4.5. Very interesting!

I said it before and it's a FACT. The 5.6 is NOT based on, or built from the 4.5. It is a totally different family of engines.

Besides that, what gains could you get using a larger TB when the intake is matched to the TB? Check it out. The intake is about 72mm and the TB is about 70.

TitanEngineer · 08-30-2006, 06:32 PM

Quote:

Originally Posted by 20Titan05

I said it before and it's a FACT. The 5.6 is NOT based on, or built from the 4.5. It is a totally different family of engines.

Besides that, what gains could you get using a larger TB when the intake is matched to the TB? Check it out. The intake is about 72mm and the TB is about 70.

Correct, the 4.5 and the 5.6 are completely different motors built on completely different platforms. I would love to see someone do this just for the sake of it being done, but unfortunately I would severely doubt any gains would be seen, without ECU modifications, intake modifications, and a bigger fuel pump.

again, I would like to see it done, just because it has not been done, please keep us up to date if you decide to do this