View Poll Results: What engine do you think Lexus should have opted for?
5.0L
27
79.41%
5.7L
7
20.59%
Voters: 34. You may not vote on this poll
5.0L V8 versus 5.7L iForce V8
04-26-09, 10:12 AM
#16
Lexus Champion
I think Lexus did a great job on the engine. 5.0L is a good displacement, but like most people have said, torque depends on bore size and also the stroke...F1 cars....small displacement....short stroke....insane rpms....you get high hp and torque.... good example is the M3 engine....4.0L, almost the same power as our F, less torque, but a good fit for our car....
Sometimes there's a replacement for displacement
Sometimes there's a replacement for displacement
04-29-09, 06:05 PM
#17
Tech Info Resource
iTrader: (2)
So according to the New Car Features, the UR series have 105.5mm bore centers. With a 100mm bore, that leaves 5.5mm of cylinder wall between the cylinders. 0.2178" is not much at all especially for 600 hp. Did Toyota Motorsports use a Cup bottom end?
05-04-09, 12:39 AM
#18
Stroking to 91.5 drops red line to 6555 rpm for any long term reliability. Anything over that is asking for a seriously short service life. Besides that, a 6mm overbore in a Toyota engine? Wow. They've not made a block that full of meat for a very long time unless 5Axis have removed the existing bores and replaced them with a whole new bore and deck combination. This kind of mod means even shorter long term reliability. The power will be nice. The problems will be immense.
Want more power? Decrease the weight of the car first
05-04-09, 07:16 AM
#19
Lexus Test Driver
Couldn't agree more......there are so many places to save weight on the IS-F
I would start with lighter c/f seats, removal of rear seats, c/f hood, trunk, qtr panels, door panels etc. just like the 0-60 sema car......titanium exhaust, suspension and wheels.......you could easily get this car down to 3300-3400 lbs which would be huge!
I would start with lighter c/f seats, removal of rear seats, c/f hood, trunk, qtr panels, door panels etc. just like the 0-60 sema car......titanium exhaust, suspension and wheels.......you could easily get this car down to 3300-3400 lbs which would be huge!
05-04-09, 06:57 PM
#20
Tech Info Resource
iTrader: (2)
I weighed mine at the track on Saturday. 3742 with just over a 1/4 tank of gas. The bad news is, even with me out of the car, it's significantly heavier on the driver's side especially in the rear. I was really disappointed to see the stock corner weights. The car needs a lot of work to get anywhere near decent left/right distribution with a person in the driver's seat.
05-04-09, 10:18 PM
#22
Lexus Fanatic
iTrader: (10)
Join Date: Nov 2004
Location: Under an IS F since 2008
Posts: 13,441
Received 1,064 Likes
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586 Posts
I weighed mine at the track on Saturday. 3742 with just over a 1/4 tank of gas. The bad news is, even with me out of the car, it's significantly heavier on the driver's side especially in the rear. I was really disappointed to see the stock corner weights. The car needs a lot of work to get anywhere near decent left/right distribution with a person in the driver's seat.
That's because they developed the car on the Fuji Speedway as a right hand drive F and blanced it for the JDM market...
LoL.. j/k
Really weird that the rear drivers side weighs more??
Maybe thats where the majority of the gas was left..
Joe Z
05-05-09, 09:48 AM
#23
Tech Info Resource
iTrader: (2)
So here's the bad news from a scanned image. As you can see, moving or lightening the battery will only make it worse. It is likely possible to fix the cross weights some, but the basic side to side can't be changed without moving stuff around in the car.
From a realistic perspective there's not a lot you can do without compromising the car's streetability.
I saw a nice used 2004 GT3 on Autotrader last night that already has seats, harnesses, and a fire bottle for about the same money as an F. I suspect if I wanted an awesome track car, that would be the easy way to solve this problem. The GT3 I was in Saturday/Sunday at Roebling Road was easily tapping on 150 mph down the front straight. Somehow I'm thinking if the track is the destination, the F isn't going to be the simplest tool to sharpen.
BTW, weights include jack, spare, tool kit, and first aid. If I'd've left the owner's manual in the glove box, it probably would have helped add a little bit to the right side. This car is really nose heavy.
From a realistic perspective there's not a lot you can do without compromising the car's streetability.
I saw a nice used 2004 GT3 on Autotrader last night that already has seats, harnesses, and a fire bottle for about the same money as an F. I suspect if I wanted an awesome track car, that would be the easy way to solve this problem. The GT3 I was in Saturday/Sunday at Roebling Road was easily tapping on 150 mph down the front straight. Somehow I'm thinking if the track is the destination, the F isn't going to be the simplest tool to sharpen.
BTW, weights include jack, spare, tool kit, and first aid. If I'd've left the owner's manual in the glove box, it probably would have helped add a little bit to the right side. This car is really nose heavy.
Last edited by lobuxracer; 05-05-09 at 09:51 AM.
05-05-09, 04:20 PM
#25
Lobux racer, to bad you don't live in Cali!
You are about 200 years old, when it comes to technical knowledge age
Let me know when you are coming down for a visit!
An e92 Twin turbo x6 engine, would read = Jizz In my pants!
Also a
-- would definitely read = Jizz In my pants!
You are about 200 years old, when it comes to technical knowledge age
Let me know when you are coming down for a visit!
An e92 Twin turbo x6 engine, would read = Jizz In my pants!
Also a
-- would definitely read = Jizz In my pants!
Last edited by t0e; 05-05-09 at 04:33 PM.
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