2IS ISF Part Swap Compatibilty
#1
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I have noticed that that all the 250/350 extra underbody braces, camber kits, swaybars and other underbody goodies that aren't suppost to fit the ISF; in fact do. We had a few GTSPEC/TOMS/Hotchkis parts from few IS350's in the shop, we mounted them all on the ISF's underside with great ease (Parts: V braces, both front mount braces, rear brace, front member brace,6 link, and both swaybars).
The ISF drove much tighter, especilly in higher speed turns; bodyroll was greatly reduced... maybe a bit too much. The car also planted the tires better from a low speed launch. I do understand the improvement is mainly the swaybars working.
So the question is will the 2IS F Sport shocks swap over to the ISF's mounting locations using aftermarket springs? What is so different about the ISF's shock bodies, compared to the F Sport shocks, that they will not work.
Looking to change the shocks to a better set with aftermarket springs, but do not want to use a coilover system.
The ISF drove much tighter, especilly in higher speed turns; bodyroll was greatly reduced... maybe a bit too much. The car also planted the tires better from a low speed launch. I do understand the improvement is mainly the swaybars working.
So the question is will the 2IS F Sport shocks swap over to the ISF's mounting locations using aftermarket springs? What is so different about the ISF's shock bodies, compared to the F Sport shocks, that they will not work.
Looking to change the shocks to a better set with aftermarket springs, but do not want to use a coilover system.
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#5
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I was not talking about using F-Sport Springs, just the F Sport shocks. I would use the Tein springs with the shocks.
#6
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This is great information. I'm not sure if the FSport shocks have a softer vs harder dampening compared to the stock ISF shocks. I think one of the things that would be great for those who don't want to go all out coilovers is to be able to change out the shocks and springs (Eibachs vs other). I feel coilovers are great but take away from the daily drivability of the car...Darshana S...
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^^ The F-Sport Front & Rear shocks were not designed for the IS-F model
IS350 curb weight = 3,527 lbs & IS-F curb weight = 3,780 lbs
You can also ready more regarding the tuning of the IS-F suspension here:
Lexus IS-F Suspension Story
I always felt the shock towers were in the same location.. That’s if you confirmed that you installed an IS350 Shock tower bar on an IS-F..
If that’s true all they did was rework some of the engine bay metal, stretched the fenders out and put wider front hubs to balance everything.. along with a whole bunch of other stuff to squeeze the V8 in there..![Stick Out Tongue](https://www.clublexus.com/forums/images/smilies/tongue.gif)
Joe Z
IS350 curb weight = 3,527 lbs & IS-F curb weight = 3,780 lbs
You can also ready more regarding the tuning of the IS-F suspension here:
Lexus IS-F Suspension Story
I always felt the shock towers were in the same location.. That’s if you confirmed that you installed an IS350 Shock tower bar on an IS-F..
If that’s true all they did was rework some of the engine bay metal, stretched the fenders out and put wider front hubs to balance everything.. along with a whole bunch of other stuff to squeeze the V8 in there..
![Stick Out Tongue](https://www.clublexus.com/forums/images/smilies/tongue.gif)
Joe Z
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#9
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Great thread, I would be interested in some of the chassis braces for this car, do you have any pictures of the underside of the car.
As for the F-sport shocks, those would NOT work properly if you want them to dampen properly. I had BCRacing coils meant for a ISx50 on my IS-F and both the spring rate/improper internal valving of the shock body contributed to my car always bottoming out even on soft bumps![Frown](https://www.clublexus.com/forums/images/smilies/frown.gif)
I swapped it out to properly valved KWV3's designed for the IS-F and more issues!
I would not recommend any ISx50 suspension products for the IS-F, just not happening but the braces would be a welcome addition.
thanks for the informative post!
As for the F-sport shocks, those would NOT work properly if you want them to dampen properly. I had BCRacing coils meant for a ISx50 on my IS-F and both the spring rate/improper internal valving of the shock body contributed to my car always bottoming out even on soft bumps
![Frown](https://www.clublexus.com/forums/images/smilies/frown.gif)
I swapped it out to properly valved KWV3's designed for the IS-F and more issues!
I would not recommend any ISx50 suspension products for the IS-F, just not happening but the braces would be a welcome addition.
thanks for the informative post!
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I think from my experience with my Supra, it made it much more responsive but more harsh. I want a good compromise between handling and comfort for the ISF. I have read a lot of people saying that coilovers make the F a better drivable, but yeah, I definately want to ride in a ISF with coilovers before I go down that route. So what do you say Joe?
...Darshana S..
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I might get out of work earlier than usual.
Also, it gives me an excuse to check out your wheels in person.. LoL
Joe Z
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#12
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Concerning the F-Sport Sway Bars. See this thread:
https://www.clublexus.com/forums/is-...-and-is-f.html
In short, they both fit, but the F-Sport and the F have the same front OD Bar, so a change would be of no benefit, except, maybe, for the bushings which are stiffer on the F-Sport. The rear bar of the F-Sport is 19mm and F's rear is 17mm, and the F-Sport rear bar does stiffen things up a bit.
Lou
https://www.clublexus.com/forums/is-...-and-is-f.html
In short, they both fit, but the F-Sport and the F have the same front OD Bar, so a change would be of no benefit, except, maybe, for the bushings which are stiffer on the F-Sport. The rear bar of the F-Sport is 19mm and F's rear is 17mm, and the F-Sport rear bar does stiffen things up a bit.
Lou
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...So the question is will the 2IS F Sport shocks swap over to the ISF's mounting locations using aftermarket springs? What is so different about the ISF's shock bodies, compared to the F Sport shocks, that they will not work.
Looking to change the shocks to a better set with aftermarket springs, but do not want to use a coilover system.![Uhh...](https://www.clublexus.com/forums/images/smilies/1387914497.gif)
Looking to change the shocks to a better set with aftermarket springs, but do not want to use a coilover system.
![Uhh...](https://www.clublexus.com/forums/images/smilies/1387914497.gif)
Javier