pat056

A guy helping me prepare my 1993 RSA (3.8L) race car is suggesting I look at an larger throttle body system.
I have the Motronic ignition system, which he suggests I keep. He likes MSD but says I really can't beat what I have.
My questions are:
Has anyone done this?
Did you see a measureable housepower gain? If so, how much? I'm currently approx. 270 rwhp.
What were any other advantages or shortcomings?
What system did you go with?
I race in PCA GT-3S. Will I stay legal?
Any other questions I should have asked and didn't?
If it sounds like I'm asking elementary uninformed questions, there's good reason for that

kurquhart

I purchased a 964 RS throttle body, but I haven't installed it yet. My mechanic says that it should be good for 10-15 HP on my stock engine; could be more with a 3.8?

You will likely need to remap your DME chip so it doesn't run too lean.

Ritter v4.0

I don't know- but I'd like to.
Geoffrey??

Geoffrey

The 964RS throttle body is the same as any manual tranmission engine with the plastic manifold ie late 91 and later engines.

kurquhart

Silly me - I really need to learn to do more research before I buy parts off eBay!

As Geoffrey tactfully points out, while the throttle body I purchased (964 110 128 00) is an RS part, it is not unique to the RS. In fact, since I have already upgraded to the later plastic manifold, I currently have this exact part on my engine.

Ritter v4.0

Will the plastic manifold retrofit to earlier model throttle body? Or do you need the one referenced in this thread?