You can use either and ABF or a VR6 unit. Some sloting of the throttle body holes and port matching will be required.
The Reeves Mk2 uses what I believe is a Sierra Cosworth unit, at least if the throttle pot fitted is anything to go by. Intend to get measurements off it at some stage. That particular install comes off the inlet on the offside.
Thanks. 12valver mentioned his ABF TB was a fair bit bigger than the AGU one currently on mine. Can you suggest a few ideas for a DBC TB I could look out for that is around the 70-75mm range? I would like to match it to the AGU inlet mani. Management is emerald. Cossie might be an option as Chris mentions... Cheers
20vT units w/M3.8.3 controller are 54mm. 2E, AGG 8v are the same dia. as well. VR6 units with M3.8.1 controller are 65mm as are the units w/o adaptive idle M2.7 and M2.9.1. ABF Digi 3.0 and 3.2 are 65 mm. Use the ABF unit as used on my 225PS 20vT to 16vT hybrid manifold. Do not really see a problem unless your desired airflow needs to support 450+ PS.
Cool, is the abf 2ltr 16v? I think there's a mk3 gti an a vr6 at my local scrappy... Is it just plug an play or will I need to reset the throttle on the ecu (emerald) Cheers
Thanks for the info Toyotec I think the 54mm tb's are probably suited to flow for 300+ hp range and as you say, 65mm to 450. The problem is I am trying to size it for 450-500 hp range and think 70mm might be better suited to this as it should not be a restiction unless well over 500hp mark. What is your opinion? Driveability on low throttle openings are not really a priority. I would like to buy the SEM inlet and see people using mustang DBC tb's with adapter plates but that is all getting a bit expensive so want to stick with OE AGU inlet for the time being and fit a larger tb. Swaying towards just keeping it simple and fitting 65mm tb but can you think of any other easily obtainable tb's around 70mm mark and stay DBC? I was thinking the hole spacing on the 65mm tb will be the same as my AGU manifold - is this correct? Challice - sorry for the thread hijack, just been looking into this recently and was going to ask on here anyway. ABF is 2.0, dont know about the second question though, yet to get that far with mine!
im running the sem mani and a vr6 throttle body on emerarld. setting up the throttle pot on emerald is easy it tells you what to do. takes 2 seconds. i think its easier to oval the holes to get the abf throttle to fit rather than the vr6 throttle due to its spacing for the bolt holes.
How are these being measured? I've got a VDO one here and across the spindle it's 57mm, but taking into account body curvature for the inwards-moving butterfly on the inside, it's 54mm in places.
Was thinking back to a book I was reading a while ago so just went and looked it out and thought it might be handy for others with some of the info. Copied from 'Forced Induction performance tuning' by A. Graham Bell Throttle plate requirements For turbocharged engines Throttle Plate (mm)_____Maximum Horsepower 50.........................................250 56.........................................310 62.........................................390 70.........................................500 75.........................................600 85.........................................750 90.........................................830 100.......................................1000 I think the horsepower figures will likely be ATW numbers...
Would have thought it was across the spindle? For us I guess that is the important one as the body curvature cast into the tb housing could be ported out. I think some tb housings can be modifed to accept a larger butterfly/spindle but would be specific to that particular tb housing....
Got my VR6 throttle body today so did some measurements so ill post them up for interest... mines off an AAA VR6 an across the spindle is 64mm the one that was fitted to mine was 56mm again across the spindle the I/D of the inlet mani BAM is 61.5mm the biggest opening on the VR6 TB is 70mm so the adaptor plate im goin to have a friend fabricate will be 70mm tapering down to 61.5mm between my two TB's theres a 27.84% increase in the cross sectional area only issue with mine is im goin to have to fit the VR6 TB at 45 degree angle to give the throttle enough clearance to move... VR6 on left - old one on right an from the back thats ruffly the place it will sit hopfully ill see some gains...
Those figures a little off to me tbh I know of 3 engines running 650+ bhp of 65mm vr6 TB without gas and support 150hp shot of gas as well on top of that Recently Jordy was running 700+ without gas on 70mm TB I think vr6 TB is big enough for most applications up to 600 bhp
