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PostPosted: Wed Oct 19, 2016 12:04 pm 
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From what my limited internet research has shown is the only permanent fix is a LS1

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PostPosted: Thu Oct 20, 2016 7:36 pm 
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Definitely not a Legends car. :(

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PostPosted: Wed Nov 02, 2016 10:41 am 
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Detuned corvette is usually the easy and correct answer. With the lower PWR limits and recently increased mod factors, it might be possible to build an over powered FWD sedan if you can get it to handle well enough.


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PostPosted: Tue Nov 15, 2016 1:29 pm 
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Arca_ex wrote:
NB Miata with a K series swap and probably 275mm 15" Hoosiers.


As of now, ST4 rules don't allow tubular subframe (i.e. - non-production vehicle.)

So no K-swapped Miatas running in ST4. Just SR20 and Ecotec swapped Miatas. :(

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PostPosted: Mon Nov 28, 2016 3:16 pm 
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This might be wishfull thinking condidering my plans but could see a 350z/370z being competitive in tt4. Would be SpecZ less 300lb with aero. Zs had varying success in ttb and tt3 but where either underpowered or underpreped in those classes.


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PostPosted: Sun Dec 11, 2016 7:29 am 
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How do you come up with spec z minus 300lbs.
Spec z is already 12:1 power to weight.




uote="Ckdevil"]This might be wishfull thinking condidering my plans but could see a 350z/370z being competitive in tt4. Would be SpecZ less 300lb with aero. Zs had varying success in ttb and tt3 but where either underpowered or underpreped in those classes.[/quote]


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PostPosted: Sun Dec 11, 2016 8:51 am 
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And that is for the least powerful 03-04 models.

esr wrote:
How do you come up with spec z minus 300lbs.
Spec z is already 12:1 power to weight.




uote="Ckdevil"]This might be wishfull thinking condidering my plans but could see a 350z/370z being competitive in tt4. Would be SpecZ less 300lb with aero. Zs had varying success in ttb and tt3 but where either underpowered or underpreped in those classes.
[/quote]


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PostPosted: Mon Dec 12, 2016 8:47 pm 
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After doing some research an talking to a director seems like you are kind if right.
Taking 300lbs from a spec z which is 3100lbs with driver would be pretty Dificult and or expensive.
Turns out that the 12:1 is average horsepower so that means that my spec z which is at 12:1 pick power at 260whp would be at about 240 or less average horse power.
Then you take off 0.3 for 275 tires
Take off 0.4 from factory aero or no aero as specz
That gives you 11.3:1 for a spec z
That means that you would have to be at 295 or so peak whp to be at the ideal power to weight in spec z trim.
That is hard to do on a de engine with just bolt on stuff.

So the HR would be the way to go for simplicity sake.



uote="Ckdevil"]This might be wishfull thinking condidering my plans but could see a 350z/370z being competitive in tt4. Would be SpecZ less 300lb with aero. Zs had varying success in ttb and tt3 but where either underpowered or underpreped in those classes.[/quote]


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PostPosted: Mon Mar 20, 2017 10:34 am 
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esr wrote:
So the HR would be the way to go for simplicity sake.



The HR is not very reliable, in my experience, in modified trim. When stock, it will run 25 minutes without an issue on a cool day, but once modified and running hotter, they need substantial investment. Clutch Slave Cylinder modification ($$), oil cooler, big radiator with cooling ducts, etc. They are also heavier, but can make 310whp without much modification. Basically a SpecZ with a higher horsepower allowance (HR is 275whp for SpecZ at 3400 (or 3450?) race weight). I still preferred the rev-up DE version and 260whp allowance at the lower weight.

Maybe I'll revive my NISMO for competition, depending on if either of my Miatas can become ST4 competitive. :)


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