View Poll Results: to supercharge or to upgrade to the isf
Supercharge the IS350
22
56.41%
Upgrade to the ISF
17
43.59%
Voters: 39. You may not vote on this poll
to supercharge the is350 or buy an isf?
02-02-18, 07:49 AM
#16
Driver School Candidate
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to be honest redspencer you sound like you have a thing against the isF and are just stating random fact about dyno charts which NEVER show the cars full potential. I guess the extra 70ish pounds of torque the isF generates doesn't really matter? lol
I would put my stock isF against ANY supercharged is350 and have no problem showing you the isF is bar none the better car and faster. Now factor in full bolt ons and tune its not even going to be close.
show me some lap times and 1/4 mile times with video of "claimed" is350 being as fast as you think its going to be.
either way do what makes you happy OP. I have owned all is250, is350, and now a 2013 isF. I didnt want to continue to throw money at a car I KNEW would never be quite the car an isF is. If you're an isF hater than get a blower and hopefully one day we can put the cars against each other. Also keep in mind 200-300k mile isF have still sold for over $10k there is no way an is350 would pull that same cash.
I would put my stock isF against ANY supercharged is350 and have no problem showing you the isF is bar none the better car and faster. Now factor in full bolt ons and tune its not even going to be close.
show me some lap times and 1/4 mile times with video of "claimed" is350 being as fast as you think its going to be.
either way do what makes you happy OP. I have owned all is250, is350, and now a 2013 isF. I didnt want to continue to throw money at a car I KNEW would never be quite the car an isF is. If you're an isF hater than get a blower and hopefully one day we can put the cars against each other. Also keep in mind 200-300k mile isF have still sold for over $10k there is no way an is350 would pull that same cash.
02-02-18, 08:02 AM
#17
^ I don't really see the IS350 fanboy-ism just stating that the supercharged IS350 could theoretically be comparable to a FBO ISF. RR Racing's ISF with their power package - tuned intake, exhaust, headers, makes about 424/404 whp/wtq (http://www.rr-racing.com/RR-Racing-T...isfitk0003.htm), compared to this supercharged IS350 with 412/324 coupled with the 2IS350s gear ratios and weight advantage, not to forget AWD but that probably negates the weight advantage. I personally think we should wait and see for an actual comparison test in the future. RR racing has stated that the Stage I supercharger has the power to weight of a stock RCF which is slightly faster than a stock ISF 0-60 and 1/4 mile times, so given that the stage II kit has an additional 55-60 whp I don't see how it could be impossible for IS350 to match a FBO ISF, but obviously the full potential of the ISF is leaps and bounds higher than the IS350.
I would put my stock isF against ANY supercharged is350 and have no problem showing you the isF is bar none the better car and faster. Now factor in full bolt ons and tune its not even going to be close.
show me some lap times and 1/4 mile times with video of "claimed" is350 being as fast as you think its going to be.
show me some lap times and 1/4 mile times with video of "claimed" is350 being as fast as you think its going to be.
Whichever is faster between an IS-F w/ FBO + Tune versus an IS350 w/ SC is up for debate and could go either way but for you to state that an "isf will blow your doors off stock even with you being supercharged" sounds a bit short-sighted and back to my analogy of the few egotistical IS-F owners.
Last edited by redspencer; 02-02-18 at 10:21 AM.
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Icetrai350 (07-06-21)
02-05-18, 07:24 AM
#21
Driver School Candidate
I think were missing the point here. The question is not can you make an is350 supercharged comparable, its a question of value. I can go get a miata and a driver to blow the doors off anything lexus makes so who cares. If you factor in all the other things the cars don't compare, the 3780 vs 3737 weight is not that significant that everyone keeps mentioning. The brakes and wheels are a huge part of that weight difference, the transmission, the LSD, the torque, the reliability, oiling system, etc are other major components the is350 falls short. Showing a lightning lap from who knows when doesnt matter. the 2008 isf could have done its lap in the rain, there is no way stock for stock those two cars run similar lap times with the same driver under the same conditions. Is the isF a supercar? no lol, but if were discussing overall value purchasing an isf is and will forever be the better car. Any car can be modified to go fast, its just a matter of how much money you want to spend.
02-05-18, 02:43 PM
#26
Racer
you're probably be the first to suggest swapping a 4GR into the ISF ever LOL. Everyone imagines swapping in the ISF engine in the IS, but I bet there is an ISF out there with a 2JZ... since there are already a couple regular ISs with them
02-05-18, 05:28 PM
#27
I think we can all agree with you re ego driven posts.
I was surprised at the lap time image you posted (noting the 2014 IS 350 putting down a faster lap than a 2008 IS F), but alas, upon further investigation, my surprise turned to wishful thinking, as it seems the 2008 IS F lap time was a bit of an anomaly?... but I kinda knew.
If you read up Car and Driver's historical Lighting Lap list somewhat, the more recent F cars posted times ranging from 3:05.4 for the 2011 IS F, to 3:05.8 for the 2015 RC F, and 3:05.9 for the 2016 GS F - oh well.
As to OP's poll, I say upgrade to the F, instead of trying to make a 350 an F.
I was surprised at the lap time image you posted (noting the 2014 IS 350 putting down a faster lap than a 2008 IS F), but alas, upon further investigation, my surprise turned to wishful thinking, as it seems the 2008 IS F lap time was a bit of an anomaly?... but I kinda knew.
If you read up Car and Driver's historical Lighting Lap list somewhat, the more recent F cars posted times ranging from 3:05.4 for the 2011 IS F, to 3:05.8 for the 2015 RC F, and 3:05.9 for the 2016 GS F - oh well.
As to OP's poll, I say upgrade to the F, instead of trying to make a 350 an F.
I planned on refraining from side tracking the OPs original inquiry but I'll add a bit more since the lap times were brought up. Yes, I was fully aware of the more recent VIR times from the more recent year Fs but refrained from including those on my original post as A) majority of IS-F owners are part of the MY 08-09 group and B) my point on the 2014 IS350 F-Sport being comparable to a stock 08 IS-F on a road course was still valid. The 08 IS-F lap time was not necessarily an anomaly. This was discussed on several older threads on the ISF sub-forum when the MY11 made a significant improvement over the 08 model due to the addition of a torsen LSD, improved steering feel and feedback, and a significantly improved suspension setup which removed most of the harsh suspension non compliance and heavy understeer from the original tune. It's well documented that the original suspension tune on the initial IS-F release was good but not great, especially compared to the well established e90 M3. In early 2010, Lexus documented a 2 second lap time improvement at Fuji Speedway over an 08 IS-F with only the addition of a mechanical LSD for the MY10 IS-F. On a 3 minute course like VIR, a significantly improved suspension can help the driver confidently reduce lap times by another 1-2 seconds a minute which is the case with a 11+ IS-F.
On another note, though the 11+ IS-F, RC-F, and GS-F all post times in the 3:05 range at VIR, a Camaro V6 (not a V8) with the 1LE suspension posted an even faster time around VIR (3:04) than these three Lexus F cars.
This re-emphasizes that brute horsepower doesn't necessarily equate to faster lap times over a slower car with a well tuned chassis and suspension.
Last edited by redspencer; 02-05-18 at 06:06 PM.
02-05-18, 07:28 PM
#28
I was surprised to see of a 350 essentially outperforming an F car, my post was simply meant to provide a more current picture of how the current IS 350 stacks up against the most current IS F car tested (no contest).