Where does the extra HP come from?
03-30-06, 12:08 PM
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Where does the extra HP come from?
The IS250 puts out 204HP, which is 204/2.5 = 81.6 HP per liter. With the 3.0 version in the GS it is also 245/3.0 = 81.6 hp per liter. But with the IS350 it is 306/3.5 = 87.4 HP per liter. The 350 should be putting out about 286HP if it was tuned the same as the 2.5 and 3.0 versions. So what did Lexus do to the 3.5 version that gives it the extra 20HP?
03-30-06, 12:38 PM
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Originally Posted by 4TehNguyen
250 and 350 both have direct injection
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03-30-06, 12:40 PM
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Originally Posted by insider
The IS250 puts out 204HP, which is 204/2.5 = 81.6 HP per liter. With the 3.0 version in the GS it is also 245/3.0 = 81.6 hp per liter. But with the IS350 it is 306/3.5 = 87.4 HP per liter. The 350 should be putting out about 286HP if it was tuned the same as the 2.5 and 3.0 versions. So what did Lexus do to the 3.5 version that gives it the extra 20HP?
03-30-06, 12:51 PM
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Originally Posted by Mrbig
High compression and the direct port injection......
03-30-06, 01:14 PM
#13
I can't answer the OP's question, but you guys need to check your facts before opening the proverbial mouth. Out of all the responses so far, only SilverBolt's makes the most sense.
1. 2GR-FSE (3.5L) is a mixture of DFI and traditional PFI (port fuel injectors). 4GR-FSE (2.5L) is the only engine which is completely DFI. (Credit to Scotty99 in beating me in posting this while I looked for the sources and links.)
2. The 4GR-FSE runs at 12:1 compression ratio. 2GR-FSE runs at 11.8:1.
Source: Official 2IS Specifications
Cheers,
Kermee
1. 2GR-FSE (3.5L) is a mixture of DFI and traditional PFI (port fuel injectors). 4GR-FSE (2.5L) is the only engine which is completely DFI. (Credit to Scotty99 in beating me in posting this while I looked for the sources and links.)
2. The 4GR-FSE runs at 12:1 compression ratio. 2GR-FSE runs at 11.8:1.
Source: Official 2IS Specifications
Cheers,
Kermee
Last edited by Kermee; 03-30-06 at 01:19 PM.
03-30-06, 04:35 PM
#14
Having both direct AND port injection doesn't guarantee more power. It only helps alleviate worries regarding running lean. Running rich would increase the power, but the amount that you're saying (about 6hp/liter) is unlikely to be achieved... plus Toyota wouldn't run something rich to just boost power ratings =P (or at least it's assumed haha).
Having a lower compression ratio obviously wouldn't add power... but the addition of port injection would have leaned toward utilizing a higher CR since fuel distribution wouldn't be an issue.
It must all be in the valve timing. Since it can be manipulated, it can be altered to add or reduce power and a minute difference of 6hp/L would be possible.
But let's just be happy it's rated at 306 peak hp in the US and not 286 like it "should've" been. =P
Having a lower compression ratio obviously wouldn't add power... but the addition of port injection would have leaned toward utilizing a higher CR since fuel distribution wouldn't be an issue.
It must all be in the valve timing. Since it can be manipulated, it can be altered to add or reduce power and a minute difference of 6hp/L would be possible.
But let's just be happy it's rated at 306 peak hp in the US and not 286 like it "should've" been. =P
