Joff and MrsJoff's Chaste White BorgWarner FD build

joff · 12-27-2010, 06:29 PM

I stuffed a wad of steel wool down the EGR passages and JBwelded them shut. I also did the other side too.

I ported my extension manifold with a hacksaw and dremel. I removed the center support where the butterflies used to be then knife-edged and smoothed the exposed primary/secondary walls.

Now theres a better chance of taking advantage of the bigger throttle body:

joff · 01-01-2011, 08:14 PM

I used the OEM intake gasket to port match the LIM to UIM, and the gizzmo phenolic gasket to port match the LIM. It wasn't a lot of material but it sure did take awhile with the dremel.

Now that its done, I'm not sure if this was a good idea or not, as a local rotary expert told me that while it will help top end power by a few hp, it may create excessive intake reversion and low speed cruise backfiring/sputtering. Anybody else have any experience with this?

I'm hoping the effect is minimal on my mostly stock ports as I anticipate a bit of a driveability loss already by replacing the stock throttle body and loosing the way it opened up the primary butterfly first.

Xcessive LIM top (to stock UIM):

Xcessive LIM bottom:

stock UIM (to LIM):

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12-27-2010, 06:29 PM	#1
joff Rotary Fanatic Join Date: Dec 2008 Location: Mesa, Arizona Posts: 114 Rep Power: 17	I stuffed a wad of steel wool down the EGR passages and JBwelded them shut. I also did the other side too. I ported my extension manifold with a hacksaw and dremel. I removed the center support where the butterflies used to be then knife-edged and smoothed the exposed primary/secondary walls. Now theres a better chance of taking advantage of the bigger throttle body:

01-01-2011, 08:14 PM	#2
joff Rotary Fanatic Join Date: Dec 2008 Location: Mesa, Arizona Posts: 114 Rep Power: 17	I used the OEM intake gasket to port match the LIM to UIM, and the gizzmo phenolic gasket to port match the LIM. It wasn't a lot of material but it sure did take awhile with the dremel. Now that its done, I'm not sure if this was a good idea or not, as a local rotary expert told me that while it will help top end power by a few hp, it may create excessive intake reversion and low speed cruise backfiring/sputtering. Anybody else have any experience with this? I'm hoping the effect is minimal on my mostly stock ports as I anticipate a bit of a driveability loss already by replacing the stock throttle body and loosing the way it opened up the primary butterfly first. Xcessive LIM top (to stock UIM): Xcessive LIM bottom: stock UIM (to LIM):