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was going to recommend an RX8 70mm DBW because JDL Mfg makes a T2 adapter, which if you’re not informed might appear to be no bueno …
except, it’s a Ford Mustang 4.6L 2V - 70mm bolt pattern, and an OE Ford 70mm cable TB can be easily found for cheap as most Mustang owners will swap to 75mm or larger, a new aftermarket one from Accufab is ~$260
except #2, I have an aftermarket 70mm TB for it that I’ll give you for free
was going to recommend an RX8 70mm DBW because JDL Mfg makes a T2 adapter, which if you’re not informed might appear to be no bueno …
except, it’s a Ford Mustang 4.6L 2V - 70mm bolt pattern, and an OE Ford 70mm cable TB can be easily found for cheap as most Mustang owners will swap to 75mm or larger, a new aftermarket one from Accufab is ~$260
except #2, I have an aftermarket 70mm TB for it that I’ll give you for free
I modified a T2 upper to take a single throttle body (stock LS1) and I hated it. It lasted one day. It killed midrange torque, part throttle drivability, and it didn't seem to make any more power. Took that sucker right back off again
This on a large street port, naturally aspirated but turbos are just naturally aspirated engines with a little extra help.
A N/A throttle body will work on a T2 intake manifold. I used the same throttle body on a T2 and a S4 N/A intake manifold (same engine) and I don't even remember what it originally came from.
I modified a T2 upper to take a single throttle body (stock LS1) and I hated it. It lasted one day. It killed midrange torque, part throttle drivability, and it didn't seem to make any more power. Took that sucker right back off again
This on a large street port, naturally aspirated but turbos are just naturally aspirated engines with a little extra help.
A N/A throttle body will work on a T2 intake manifold. I used the same throttle body on a T2 and a S4 N/A intake manifold (same engine) and I don't even remember what it originally came from.
Do thw t2/s4 havs a stepper style tps or an on off tps
It was the stock plunger. I ran (still run) a Megasquirt and found that acceleration enrichment was not really needed over about 1/2 throttle anyway, which is probably why Mazda did what they did.
I have a Holley based throttle body now on a pre-FC based engine, which has a standard type full-travel TPS, and it was a bear to get the acceleration enrichment tuned properly until I discovered the map to alter how much acceleration enrichment is used compared to existing throttle opening..
It was the stock plunger. I ran (still run) a Megasquirt and found that acceleration enrichment was not really needed over about 1/2 throttle anyway, which is probably why Mazda did what they did.
I have a Holley based throttle body now on a pre-FC based engine, which has a standard type full-travel TPS, and it was a bear to get the acceleration enrichment tuned properly until I discovered the map to alter how much acceleration enrichment is used compared to existing throttle opening..
so what's the verdict is a single throttle body good or should I get a factory one with a good tps setup
Single throttle bodies suck with the way rotary intake ports work. The vacuum signal starves the other rotor of air instead of pulling through the throttle plate, except at WOT, and then the difference is negligible.
The Holley setup I mentioned is a 750cfm carb turned into a throttle body for fuel injection... four independent runners, no plenum. I still think the S4 N/A intake manifold is better for power but with the full bridge engine I didn't want any plenum volume at all for idle/street drivability. Plus it sounds awesome
04-20-24, 10:29 PM
