Originally Posted by Dale
1. What is the simple performance difference between Weber 40's or 45's if properly setup?
2. Is one or the other better for street and why?
3. What kind of gain in performance will fuel injection have over the carbs? 4. Is it worth the money to go with FI over carbs?
5. What brands and models of FI are there available for the TS conversion?
6. Are there other intake manifolds that will work with either the carbs or FI?
7. For street use, what benefit would a direct fire mapable ignition system grant me?
8. What brands and models of direct fire ignition systems are there out there that'll work with the TS conversion?
Here are some quick and dirty answers.
1. 45's will move your peak power to a higher rpm. How much higher will depend on the choke size. They come with 36's I think. That's good for a peak power in a 2-L at about 6500 rpm. This is a bit up from a stock TS power band so to make use of 45's, you'll need more a bit cam, and a bit more compression wouldn't hurt.
2. What you give up with 45's is some low and mid range performance. Low and mid range is where you'll drive on the street so you'll miss it there. You will be able to drive on the street, it just won't be quite as nice.
3. When you say FI here I'm assuming something other than the Motronic FI that came with the engine but I think my answer covers them all. FI properly set up will run cleaner, neater and harder than carbs. This is especially true at lower rpms associated with street driving if we're talking 40/45 DCOE’s. You can get pretty good top end performance out of either but full-on programmable FI is easier to change/tune because you don't need a bunch of jets, etc. The stock FI with the stock cams or the slightly hotter C&B street cams will run great without any messing around past making sure everything is working properly. If the setup you want needs more fuel and air than the Motronic unit can provide, then you need to go to carbs or programmable FI to get it. Programmable FI is more flexible and more expensive. (A quick note here: most of the commercial programmable FI systems are full engine management systems so you get ignition as well.)
4. There is no universally correct answer to this question. You will have to decide how much $ is right for you.
5. There are a bunch of FI/engine management systems on the market. Check the Milano/75 threads. They seem to have a good grasp of this. If you decide to go this way, start with a very solid checking account and plan on learning a great deal about FI fundamentals, components, electronics and potentially programming.
6. The only production one I am aware of is the AHM manifold sold by themselves and EB Spares. Past that you are on your own but it's not hard to do.
7. From a practical stand point, some but not a lot. You have fewer moving parts which is nice. But you have more complex system which could be a problem to sort out. Then there are a bunch of approaches that are in between. It would also cost more $ but, hey, it's your $!
8. Again, check with the Milano/75 threads.
I’m sure this will incite a lot of conversation. There is simply no "perfect" solution to all this. It's all a tradeoff, $ vs performance, street vs track. Just what gear heads love!