Shop TURBO CLEARANCE @ THROTTLE BODY
THROTTLE BODY CLEARANCE FOR TURBOWhen 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.