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Who switched from 305/45r17's to 315/50r17's??

RGPIII

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#1
whos made the switch and what did you gain? Looking to make the switch over the winter.
 

hellno

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#2
I made the switch about two weeks ago and since I went ethanol I’m glad I did I’m able to hook with my most power now
 

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While the 305 will work on a heavily prepped track (depending on power) the 315 will give a lot more consistent leave. Especially when the prep is less than ideal. I do think the 3.09 gear may be necessary with the added diameter of the 315. That of coarse depends on how much power you’re making and how slippery the track is.
 
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hellno

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#4
I’m considering going back to my 3.09 but I’m enjoying being able to launch it for now lol
 
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Thread Starter #5
Also swapping out the factory springs to the HHP demon springs. Hopefully get this thing hooked up.
 

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I did the demon springs and the lockout kit worked well for me
 

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I did the demon springs and the lockout kit worked well for me
That was great advice you got on the demon (hhp) spring and bmr lock out kit !

Sent from my BBF100-2 using Tapatalk
 

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whos made the switch and what did you gain? Looking to make the switch over the winter.
This is the route I will be going once my current 305's are finished .

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That was great advice you got on the demon (hhp) spring and bmr lock out kit !

Sent from my BBF100-2 using Tapatalk
Yes it was indeed lol
When in Rome 👍
 

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This is the route I will be going once my current 305's are finished .

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Your 305s are finished your already increasing your power your going to be kicking yourself if you try to hook in them next season
 

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Your 305s are finished your already increasing your power your going to be kicking yourself if you try to hook in them next season
What do you mean I already increased my power ???

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#13
And give me your old 305s.
 

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Really I might make you a great deal
 
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Thread Starter #15
My 305’s are smoked.
 

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I am going to use the 315 for next season. I couldn't get the 305 to hook well with great prep. Tune was adjusted for it as well. I think it will help. We'll see how it does come spring.
 

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I wonder if the 315's will help the 60' with stock boost cars or if these are basically needed when more hp or boost is added ? …..I do have 3.09's already.
 

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I think so, especially if you can leave it RPM vs idle. I could only leave slow squeeze of the pedal off idle on 305's.
 

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whos made the switch and what did you gain? Looking to make the switch over the winter.
Just a quick note. I switched and I had high hopes. But if the Track is crap, well then the track is crap. The 315's will not hook.
 

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Just a quick note. I switched and I had high hopes. But if the Track is crap, well then the track is crap. The 315's will not hook.
They will give you a better chance than the 305's no doubt though with "marginal" prep.
 

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