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Faeflora 01-31-2011 07:13 PM
What size throttle body to get?
 
1 Attachment(s)
Sean is reaming out my stock intake manifold and I am going to cut the pinched neck off and have a pipe and throttle plate welded on. After modification, the stock plenum should be close to 2 liters.

So.

What size throttle body should I get? Choices are 60,70,80,90mm. Will be running 20-30psi.

I make 108,920 horsepower and this is my engine.

Attachment 241389

Pen2_the_penguin 01-31-2011 07:23 PM
WTF is this bastard for?!?!??!

Jeff_Ciesielski 01-31-2011 07:28 PM
Originally Posted by Faeflora (Post 684734)
Sean is reaming out my stock intake manifold and I am going to cut the pinched neck off and have a pipe and throttle plate welded on. After modification, the stock plenum should be close to 2 liters.

So.

What size throttle body should I get? Choices are 60,70,80,90mm. Will be running 20-30psi.

I make 108,920 horsepower and this is my engine.

https://i.imgur.com/3FwQY.jpg
Good 'ol Wartsila engines. Can't live with them. Can't beat the shit out of their absolutely incompetent sales staff.

Savington 01-31-2011 07:38 PM
Whatever size you want, since you'll quickly discover that 2 liters is too small and the stock runners are garbage anyway.

Or you can graft a B18 manifold onto the motor and run a 65-70mm TB, or try a 90mm Q45 TB. The larger the throttle body, the better the flow (to a point) and the worse the low-speed driveability is.

Faeflora 01-31-2011 08:13 PM
Originally Posted by Savington (Post 684741)
Whatever size you want, since you'll quickly discover that 2 liters is too small and the stock runners are garbage anyway.

Or you can graft a B18 manifold onto the motor and run a 65-70mm TB, or try a 90mm Q45 TB. The larger the throttle body, the better the flow (to a point) and the worse the low-speed driveability is.
OK Mr Wet Blanket do you really think the aftermarket honda IM plenums are really 3 liters?

Oscar 01-31-2011 08:37 PM
Originally Posted by Savington (Post 684741)
Whatever size you want, since you'll quickly discover that 2 liters is too small and the stock runners are garbage anyway.

Or you can graft a B18 manifold onto the motor and run a 65-70mm TB, or try a 90mm Q45 TB. The larger the throttle body, the better the flow (to a point) and the worse the low-speed driveability is.
Wouldn't the low-speed problem be (partially) fixed by using a progressive throttle linkage?

JayL 01-31-2011 08:39 PM
Q45 if the rest of your car is man enough to justify it.

Faeflora 01-31-2011 08:52 PM
Originally Posted by Oscar (Post 684763)
Wouldn't the low-speed problem be (partially) fixed by using a progressive throttle linkage?
??? My motor above is a diesel motor and is not carbed.

Originally Posted by JayL (Post 684764)
Q45 if the rest of your car is man enough to justify it.
How was low speed driveability for you Jay? Did you notice a change after going from your stock IM/TB to the flipside/q45?

Unlike when my car was stock, about 90% of my driving is not at WOT. Stock I think I was indeed at WOT 90% of the time.

baron340 01-31-2011 09:20 PM
Originally Posted by Faeflora (Post 684748)
OK Mr Wet Blanket do you really think the aftermarket honda IM plenums are really 3 liters?
Do you really think that a stock BP mani flows half as well as any aftermarket b18 mani, much less a nice edelbrock mani?

JayL 01-31-2011 09:34 PM
Originally Posted by Faeflora (Post 684772)
How was low speed driveability for you Jay? Did you notice a change after going from your stock IM/TB to the flipside/q45?
With a progressive linkage on the Q45 the drive-ability was equal to the stock throttle body. I'm a big fan of an aftermarket IM/TB combo, I would recommend staying far away from anything made by Flipside Customs. I personally think you're wasting your time with the oem manifold regardless of which throttle body is on it. Stop trying to polish turds.

jtothawhat 01-31-2011 10:30 PM
I run a Ford 70MM 5.0 TB with no issues and low speed, I had to use a helper spring though I mounted on my plenum because the throttle spring was too weak.


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