718 GT4?
#1549
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Originally Posted by tcsracing1
BGB has been fitting GT3 callipers to the Cayman for years. It is a nice upgrade.
And now back to 718 GT4 speculation, our regularly schedule program.
#1550
Three Wheelin'
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#1552
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Torque and Displacement are basically proportional (5% more displacement nets 5% more torque at all RPM - and the motor without the stroker crank should be theoretically capable of higher revs and more power per liter). Modifications can obviously be applied to either motor to make the numbers look to be independent from displacement changes.
#1553
Have you seen the DeMan 4.0L? Their dyno chart suggests torque at 4k revs is 305ft/lb v 250 stock. It's not all about peak numbers
http://demanmotorsport.com/services/...-0-gt4-upgades
Perhaps you drive a 4.0L torquey car differently?
http://demanmotorsport.com/services/...-0-gt4-upgades
Perhaps you drive a 4.0L torquey car differently?
Torque and Displacement are basically proportional (5% more displacement nets 5% more torque at all RPM - and the motor without the stroker crank should be theoretically capable of higher revs and more power per liter). Modifications can obviously be applied to either motor to make the numbers look to be independent from displacement changes.
When you look at the chart provided you will see the following:
Complete and Dyno Tested it includes:
- 403HP and 340FT/Lb of TQ at the wheels!
- 4.0L Stroker kit
- 82mm Throttle Body
- Headers
- Mufflers if desired
- In-house Custom Dyno Tuning
In a way thats comparing apples to oranges. Even just adding aftermarket headers to the OEM 3.8 shows differences in hp and ft-lbs from factory specs.
Show me a dyno with just the 4.0 upgrade vs the OEM 3.8 and all the other parts stock. Or in lieu of show me a 3.8 with all that added stuff compared to that 4.0 and its added stuff.
#1554
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Originally Posted by ExMB
That's very impressive if accurate, but it's a little bit misleading to think that it is due to the displacement increase. If whatever techniques that achieved these numbers were applied to the 3.8L motor, then the results should be the same across the board less 5%.
Torque and Displacement are basically proportional (5% more displacement nets 5% more torque at all RPM - and the motor without the stroker crank should be theoretically capable of higher revs and more power per liter). Modifications can obviously be applied to either motor to make the numbers look to be independent from displacement changes.
Torque and Displacement are basically proportional (5% more displacement nets 5% more torque at all RPM - and the motor without the stroker crank should be theoretically capable of higher revs and more power per liter). Modifications can obviously be applied to either motor to make the numbers look to be independent from displacement changes.
When you look at the chart provided you will see the following:
Complete and Dyno Tested it includes:
- 403HP and 340FT/Lb of TQ at the wheels!
- 4.0L Stroker kit
- 82mm Throttle Body
- Headers
- Mufflers if desired
- In-house Custom Dyno Tuning
In a way thats comparing apples to oranges. Even just adding aftermarket headers to the OEM 3.8 shows differences in hp and ft-lbs from factory specs.
Show me a dyno with just the 4.0 upgrade vs the OEM 3.8 and all the other parts stock. Or in lieu of show me a 3.8 with all that added stuff compared to that 4.0 and its added stuff.[/quote]
These are all good points. It's probably worth mentioning that the 4.0L upgrade Rick and I both sell is a stroke change which produces more torque than horsepower relative to a bore increase which would make more power than torque. This board never disappoints when it comes to information. Keep it up!
#1555
Rennlist Member
I’ve read every single page of this thread & love all the speculation!
Just going to add some fuel to the fire for fun because I haven’t seen anyone post this article yet........
http://www.autoguide.com/auto-news/2...-9.com20180503
Apparently not only is the 4.0L here to stay, but Porsche is working on decreasing emissions and bumping the redline to 9500rpm. Maybe the GT4 gets this motor
Just going to add some fuel to the fire for fun because I haven’t seen anyone post this article yet........
http://www.autoguide.com/auto-news/2...-9.com20180503
Apparently not only is the 4.0L here to stay, but Porsche is working on decreasing emissions and bumping the redline to 9500rpm. Maybe the GT4 gets this motor
#1556
Three Wheelin'
+1
When you look at the chart provided you will see the following:
Complete and Dyno Tested it includes:
In a way thats comparing apples to oranges. Even just adding aftermarket headers to the OEM 3.8 shows differences in hp and ft-lbs from factory specs.
Show me a dyno with just the 4.0 upgrade vs the OEM 3.8 and all the other parts stock. Or in lieu of show me a 3.8 with all that added stuff compared to that 4.0 and its added stuff.
When you look at the chart provided you will see the following:
Complete and Dyno Tested it includes:
- 403HP and 340FT/Lb of TQ at the wheels!
- 4.0L Stroker kit
- 82mm Throttle Body
- Headers
- Mufflers if desired
- In-house Custom Dyno Tuning
In a way thats comparing apples to oranges. Even just adding aftermarket headers to the OEM 3.8 shows differences in hp and ft-lbs from factory specs.
Show me a dyno with just the 4.0 upgrade vs the OEM 3.8 and all the other parts stock. Or in lieu of show me a 3.8 with all that added stuff compared to that 4.0 and its added stuff.
FWIW my 4l ticked over 5k miles this weekend at Smokies and is running great!
#1557
Rennlist Member
There's also an increase in compression and the bigger tb would imply a different intake manifold since I don't think you can just slap a bigger tb on the stock intake. It's really a combination of upgrades that makes all this work, focusing on just the displacement bump alone can be a little misleading.
FWIW my 4l ticked over 5k miles this weekend at Smokies and is running great!
FWIW my 4l ticked over 5k miles this weekend at Smokies and is running great!
#1558
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#1559
Race Car
#1560
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I use E85 in my DD Evo IX in the Summer with 24 psi of boost and a special map. That gives great torque per liter (435 ft-lbs from 2.0 Liters). E85 costs $1.85 per gallon (Govt subsidies make it cheap) and is around 106 octane...