8 Throttle Body Intake

[Damien]

I've moved the battery to the boot so I'll have an air filter behind each headlight. That should have minimal restriction and will look pretty good too. The main reason why I went for these throttlebodies was to make it easy to box in the trumpets. Did you get yours from EFI Hardware? Looks like their design with the angled top for the trumpets but they said they could machine the tops flat if requested.

 

[nzsimon]

no

I got mine from carbontech I don't actually believe they ever had it working at least on anything other than WOT anyway the guy strikes me as a bit dodgy

 

[Peewee]

Damien, where did you get those from?
Is it all custom by yourself? or are you doing some research/development for a company?

Will they be available for sale?

 

[cribbj]

Peewee, I've recently been investigating using bike throttles for ITB applications.

The Suzuki GSXR600/750/1000 line has TB's with 80mm centers and throats from 39mm to 52mm depending on the model and year. They come 4 to a set and they're already setup with linkage, etc. Adjustment of the C/C distance is "possible" but will require some rewelding of the linkages. Best thing about them is that they're dirt cheap on eBay (search using "GSXR throttle"). I've bought several sets to take apart and play with, and I think they'll work fine for an automotive application. They usually come c/w with fuel rails, injectors (Keihin's) and TPS's.

Here's a pic of a set on a Honda (car) head, taken from homemadeturbo.com:

 

[ed_ma61]

http://www.toymods.net/forums/showthread.php?t=2891

plate has evolved a little in design since that post, but you get the basic idea

ed

 

[Damien]

Peewee, I got mine from Carbontech and they weren't too good to start with. I'm only doing it for my own use but I've had mine overhauled by EFI Hardware with ball bearings and new butterflies with much better tolerances.

EFI Hardware already have them available in 40mm and 45mm sizes and I got the linkages through them as well. Steve Neway is the dude to speak to - very helpful([email protected]).

There's a lot of advantages with using OEM TB's though as they're generally made much better.

Ed, looking good mate. How easy are those manifolds to come by? Haven't seen many before. BTW I'm mates with Manny - asked you about flywheels the other day.

 

[Damien]

Got mine running now but the butterflies are sticking slightly so it's idling too high. Once I sort that I'll be ready to tune.

Mine are 45's and I think they're going to be a bit sensitive... 40's would be preferable but they weren't available at the time (2 years ago now). I'll post a video clip of the engine running in the next few days.

 

[ed_ma61]

finally back from the cnc man:

 

[rivmasta]

Anyone thought of using quad tb's from 4age20v?

Any examples out there? Reason I ask is because I have a couple of sets!

 

[Damien]

Have a look at this...

http://www.1uzquadcam.co.nz/

 

[rivmasta]

that is sex.

 

[ed_ma61]

if someone wants to send me a set of 4ag throttles (only to borrow to mock up) i can happily design an adapter plate to suit.

cheers
ed

 

[ed_ma61]

a bit of photoshop work adding the t/b's

thanks to peewee and his machnist for making this happen

 

[MWP]

So i guess thats 6mm aluminium plate.
Why so thick?

Also, why one large piece instead of two?

 

[ed_ma61]

its 12mm plate
an btw, how is 6mm *thick* ??

reasons its 12mm:
1 - the plate is intended to be ported to match the throttles and manifold rather than the manifold itself being ported in a large way - there isnt much fat there
2- basically the plate is designed to bolt flush to the manifold, and have stud emerging from it to which are botled the throttles. all the holes thus require counter sinking, some in one direction, some in the other. 12mm leaves sufficient fat for pull out prevention after heavy countersinking.
3 - in several positions the holes holes themselves will be tapped to accept the mounting of heim joint for the linkage arms. the heim joints are 10mm coarse metric and 12mm is a good mounting depth

reason its in 1 piece:
1 - the linkage assembly is designed into the 'bridges' of the plate. the linkage mounts need to be 'fixed' in relation to the throttle locations to prvent error/relative movement of the linkages and throttles.
2 - the way it ended up, several mounting holes affixing the plate to the manifold needed to be deleted from the design to prevent fouling. cross bridging the two halves allows distribution of clamping load from the securing studs, providing reliable tesion and seal of the plate

cheers
ed

 

[quadcam boat]

Ed,
Does that adaptor plae bolt to the standard bottom half of the manifold?
Cheers,
Andrew

 

[ed_ma61]

correct

note: that's a 98 onwards 1uz vvti manifold (and potentially a 3uz manifold - havent checked yet). will not suit early non vvti lover manifold.

 

[ed_ma61]

 

[Damien]

That's an impressive plate Ed. Must have taken you forever to get the dimensions into CAD.

Went for a slow lap around the block a couple of nights ago and the throttle response will be very nice - not as brutal as I thought it may be. However I now have another gremlin in the system as it seems that as soon as I start to move the stock ECU is going into limp-home mode and is ignoring the output from the MAP-ECU. Making dramatic changes in the fuel table has no effect on the AFR and the fixed fuel table it's using is way too lean for my setup.

Got a mate dropping a spare stock ECU to me this afternoon for me to test over the weekend as the ECU in my car now is a modded one and hasn't been used yet so it may have an issue.

Here's how it looks with the plate and trumpets. A plenum will be fabricated to enclose it.

 

[Peewee]

the throttle response will be very nice - not as brutal as I thought it may be.

Part of the lack of brutality is the fact that its pulling 1700+kg.

Either that or your tip-in timing needs tweaking.