It is amazing how much effort you put into everything on these cars. Care and dedication is an understatement. More pics of the water Nozzle and where you drilled into please.

Spank you very much for the compliment. It'* a challenge that I really enjoy. Can you be more specific about what you're asking for? Your throttle body should be identical to mine. That'* the spot you want, but you have to decide what brand/type of nozzle you need first. Then you have to counterbore the hole so the nozzle tip is flush with the inside of the bore.

I noticed you mention that the stock 95 TB will go on the SLE. Why not just go ahead and put a ported, WI, TB on your '95, as well?

The explantion was perfect for my question. Thank you. I am reasearching some water cooling soultions and I was never comfortable with putting the Water injection Nozzle in the air filter. (I have nightmares of MAF sensor failures)

The 95 is staying stock.

As far as injection location is concerned, there are advantages and disadvantages to every location you can think of. I injected in the entrance to the intake tube out of convenience. There is no risk of damaging the MAF sensor. It does muck a bit with the MAF readings though. It thinks there'* alot more air than there really is.

The other option if you don't want to modify your TB is to have a TB spacer machined. All you have to do is take your TB gasket to a machinist and tell him to make you one 1/2" thick. The gasket is the perfect profile to copy.

That sounds like an even better soultion thank you .

Good job Bill.
Nice comparisons and well presented.

He bought a TB spacer.

But modifying the TB in the long run is cheaper than fab'ing the spacer from scratch (nobody makes one for either S1 Gen), and it gives you the opportunity to shave the TB shaft like I've been doing. I've done 5 throttle bodies for 3800'* to date.

I understand, so let me rephrase my question....

Are there any disadvantages/risks to using a ported/polished TB? What advantages (if any) are there to using an altered TB on an otherwise "stock" Bonneville/H-body? Does an altered TB require supporting mods? Is gas mileage worse?

....inquiring minds want to know.

I guess I am trying to clarify the postives/negatives for those that may be thinking about doing any TB alterations on there cars.

No disadvantages whatsoever. It'* a supporting mod for me, since I've spent so much time polishing and porting everything else to match. Doesn't make much sense to spend so much time on the SC inlet, and ignore the device just upstream, right?

For you, it'll give you a tad more power at WOT (whether you'll feel it or not is a good question that will be answered soon by another 97SSEi), and a little more snappy throttle response (talking about shaving the shaft here). As far as the polishing is concerned, it just 'optimizes' the flow of the TB to it'* greatest potential. Smoother airflow, less heat. Yes, the TB actually gets hot from the friction of the incoming air if you can believe it. In fact, under boost, the hottest surface of the SC itself is the inner diameter of the SC inlet itself. All that air is scrambling to get somewhere in a hurry. The bore of the TB would be similar.

Again, I'll point out that no material should be removed from the circumference of the TB bore where the throttle plate (butterfly) rests at idle. A very fine polish in that area only.