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Discussion Starter #1 (Edited)
I am heavily considering a V3 Si tuner kit (with Heritage series gears) while prices are good over the holidays. However, I am wondering if I should even consider a V1 Ti tuner kit?
I have a stock bottom end 302 with TW 170 heads, Lunati 20350711 cam (221/229 @ .050 .540+ lift), TMOSS ported GT40 intake setup, 70 mm TB. 3550 5 speed, 3.55 gears.
I may consider an upgrade to 347/363 (Dart block based) or even a 351w at some point, but could be a couple of years, maybe never if the SC and 302 keeps me happy. This is a 100% street driven 1990 Foxbody convertible, maybe 1000 miles per year.
Surely, a larger engine would be served better with the Ti trim, but until then or if I end up staying 302/306, which would be more efficient in the 8 to 10 psi (maybe 12 psi) area? I realize a Dart based motor could take a lot more, but then there goes the drivetrain upgrades. 12 PSI via a Si trim on a 363 would be some serious power (to me anyway). When would the lack of efficiency on the Si and heat start to become an issue?
Would the Si be better on a 302 in the lower PSI and rpm ranges? 5800 to 6000 RPM would be my limit.
 

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Depends on your hp goals? I have a 363 currently and just sold my v3si. The v3si would take me to about 600-650whp but I'm going with a v1Ti trim with the goal of 700+whp hopefully. My car is also a full weight fox convertible. The v3si is a great little blower so you can't go wrong with either one.
 

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Do you have an idea of what you are looking for power?

I had a similar goal as you and made 500hp on a stock block turning it down to keep the block together at 14psi. I then upgraded to the Ti trim on a dart 347 and I'm making over 700hp at 21psi with more left in the blower. Spinning to 6000 RPM like you.

If you want 600-700hp, the Si is more than enough for you.
 

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Discussion Starter #4
Do you have an idea of what you are looking for power?

I had a similar goal as you and made 500hp on a stock block turning it down to keep the block together at 14psi. I then upgraded to the Ti trim on a dart 347 and I'm making over 700hp at 21psi with more left in the blower. Spinning to 6000 RPM like you.

If you want 600-700hp, the Si is more than enough for you.
600 to 700 HP would be plenty enough (at least I say that now). Then it will be the typical debate of 363 vs 357w when I decide to upgrade.
 

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My 2 cents is that a 302 based car will be easy enough to make that power reliably and with a 363 stroker unless you want huge power. Stay with the 347-363. My car has more than enough torque on the street it is a blast
 
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