THROTTLE BODY CLEARANCE FOR TURBO
When installing a larger turbo with a TO4E (3") or TO4S (4")
inlet, the outer diameter of the compressor housing is too tall for
either the stock intake manifold or the Lindsey Racing intake
manifold.
All TO4E and TO4S turbos before leaving our facility
have had the top lug of the turbo compressor housing completely removed. Even still, they are still too tall.
The last little bit or clearance required to make the
turbo fit under either intake is to replace the throttle
body spring bracket mounting screws with
the flat head screws supplied with the turbo.
This gains the last 1/8" of clearance needed. It allows you to
leave the bracket and spring in the same location. Step 1 "Turn Intake & Throttle Body Upside-Down"
All operations will be done from the bottom side.
Step 2 "Remove Original Screw"
If you don't have the torque screw tool, then a trusty
pair of Vise Grips gets the job done just fine. Remove
only one of the two screws at this time.
Here you see the bracket with one screw removed.
Step 3 "Drill Tapered Hole"
We are using a 5/16" drill bit to make the tapered hole to
counter sink the new flat head screws. DO NOT drill all the way through the spring bracket. Only deep enough to sink the screw down so that it is flush at the top
with the spring bracket. Drill a little, then test fit the screw.
Step 4 "Ready For Replacement Screw"
You will need to blow out or clean the hole and remove any chips from the drilling
process. If you don't have an air source, turn the intake over and
knock any debris out of the hole. Pre-fit the screw to make sure you drilled
your tapered hole deep enough. If not, drill deeper.
Step 5 "Install Screw"
We recommend a little dab of Loc-Tite on the new replacement screw before installation. Install the screw and tighten.
Step 6 "Repeat For Second Screw"
Perform all the same operations on the second screw.
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