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Traded in the ISF

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Old Aug 28, 2019 | 06:24 PM
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Default Traded in the ISF

Loved my ISF, but figured it was time for something new. Love it, but oddly my ISF seemed faster with Joe Z Exhaust.

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Old Aug 28, 2019 | 06:54 PM
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Welcome and congrats. RCF hides its speed very well especially as its power delivery in a different manner with its long gearing/high rev limit. Have you tried all of the most aggressive settings? Personally, in lead/follow in my RCF with full exhaust holding its own with several FBO/modded ISFs in a F meet in July.

In normal modes, everything is dialed back. It feels sedate. Once you put it in sport+ and manual mode (and TVD in slalom or track mode) and rev the car up to redline, everything tightens up especially at higher revs where the steering and shifts are at most aggressive. Also, RCF is severly restricted by its exhaust. It really changed the car once I got my Invidia full exhaust.

Have the same color


Last edited by 05RollaXRS; Aug 28, 2019 at 08:51 PM.
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Old Aug 29, 2019 | 12:42 AM
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Originally Posted by VDODSON
Loved my ISF, but figured it was time for something new. Love it, but oddly my ISF seemed faster with Joe Z Exhaust.


You're not the first person to share that experience...

Congrats on the new ride..!!

Joe Z
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Old Aug 29, 2019 | 01:01 AM
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^^^^^^^ WHAT JOE Z IS BACK!!!!
Congrats, same here. However, if I didn’t crashed my IS F few few years back, I woouldnt have my rc f...
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Old Aug 29, 2019 | 05:14 AM
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The RCF and ISF are obviously similar in performance, but get there a little differently. The ISF feels quicker because it's lighter and the RCF masks its speed a little more. I also had an ISF with the Joe Z exhaust and thought it felt and sounded great. The RCF is a nice step forward in tech and feel, but it isn't appreciably faster.

Congrats on the new purchase!
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Old Aug 29, 2019 | 05:43 AM
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The second I saw that Molten RCF I knew Rolla would be the very first to reply to you VDODSON!!
Puzzled why they discontinued the ISF, but then again I'm puzzled by the end of the GS as well. Meanwhile back at the RCF Forum........

Welcome, Congrats, and let the Mods Begin!!
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Old Aug 29, 2019 | 07:49 AM
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Originally Posted by Joe Z
You're not the first person to share that experience...

Congrats on the new ride..!!

Joe Z
JEEZ LUEEZ - WELCOME BACK SIR You have been Missed!

Lou
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Old Aug 29, 2019 | 08:24 AM
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TVD? I have not even read the manual yet. Will be pouring through it this weekend.



Originally Posted by 05RollaXRS
Welcome and congrats. RCF hides its speed very well especially as its power delivery in a different manner with its long gearing/high rev limit. Have you tried all of the most aggressive settings? Personally, in lead/follow in my RCF with full exhaust holding its own with several FBO/modded ISFs in a F meet in July.

In normal modes, everything is dialed back. It feels sedate. Once you put it in sport+ and manual mode (and TVD in slalom or track mode) and rev the car up to redline, everything tightens up especially at higher revs where the steering and shifts are at most aggressive. Also, RCF is severly restricted by its exhaust. It really changed the car once I got my Invidia full exhaust.

Have the same color

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Old Aug 29, 2019 | 08:24 AM
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Your exhaust is the one reason I kept my ISF so long.

Originally Posted by Joe Z
You're not the first person to share that experience...

Congrats on the new ride..!!

Joe Z
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Old Aug 29, 2019 | 08:27 AM
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Originally Posted by VDODSON
TVD? I have not even read the manual yet. Will be pouring through it this weekend.
Sorry, my bad. It is only for the RCF with the carbon fiber/torque vectoring differential (TVD) package. It was meant to be a comment about the most aggressive settings for spirited driving/turning capability. You can certainly ask questions about settings, configurations etc. on this forum.

Last edited by 05RollaXRS; Aug 29, 2019 at 09:03 AM.
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Old Aug 29, 2019 | 09:32 AM
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Originally Posted by VDODSON
TVD? I have not even read the manual yet. Will be pouring through it this weekend.
Your RCF does not have the TVD. It's part of the Performance Package. But you do have a Torsen LSD.

Lou
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Old Aug 29, 2019 | 09:54 AM
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Originally Posted by flowrider
Your RCF does not have the TVD. It's part of the Performance Package. But you do have a Torsen LSD.

Lou
He might have one of those unicorn early 2015 RCFs that had TVD as a stand-alone when the carbon fiber manufacturing was stopped due issues. It is a button in the center console so it is worth checking.


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Old Aug 29, 2019 | 03:21 PM
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Originally Posted by 05RollaXRS
RCF hides its speed very well especially as its power delivery in a different manner with its long gearing/high rev limit.
I think the IS F, RC F, and GS F all have the same gearing (long), but the RC F and GS F have 500 more rpm at redline so they hold the gear for 500rpm longer before the shifts. So an IS F at WOT will shift from 2nd into 3rd ~66mph (6,800rpm) while an RC F/GS F will do the same shift ~73mph (7,300rpm). So it may feel a bit longer in gears. Of course, the IS F is also lighter. Yet the newer Fs have more HP and TQ. They're really close in the end.
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Old Aug 29, 2019 | 03:38 PM
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If you haven't seen this, you can see they are all very close:
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Old Aug 29, 2019 | 03:55 PM
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Originally Posted by Teutonic
I think the IS F, RC F, and GS F all have the same gearing (long), but the RC F and GS F have 500 more rpm at redline so they hold the gear for 500rpm longer before the shifts. So an IS F at WOT will shift from 2nd into 3rd ~66mph (6,800rpm) while an RC F/GS F will do the same shift ~73mph (7,300rpm). So it may feel a bit longer in gears. Of course, the IS F is also lighter. Yet the newer Fs have more HP and TQ. They're really close in the end.
It becomes longer because of the bigger wheel circumference as well. Pre-2020 RCF has the same gearing has the ISF, but the high-rev and the much bigger wheel circumference all make the car's engine poiwer delivery more top end focused.. I am actually looking into putting 285/30/19 to shorten the overall gearing.

Edit: I have seen video you posted many years ago when this topic was beaten to death.

Another angle


Last edited by 05RollaXRS; Aug 29, 2019 at 05:03 PM.
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