I have a feeling new turbo will dissapoint
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From: Florida
With respect to a future replacement to the IS350's V6, if they were to go turbo and keep a V6 configuration, doesn't that meant it would have to be twin-turbos? Has there ever been a production V6 having only one turbo?
Racer
Joined: Jun 2009
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From: PA
Last edited by evident; Jul 15, 2015 at 08:45 AM.
Pole Position
Joined: Nov 2014
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From: Florida
I was asking about a V6 engine having only one turbo. Has that ever been done in a production car?
Pole Position
Joined: Nov 2014
Posts: 227
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From: Florida
What I'm actually suggesting, is that I expect Lexus will stick to using a V6 in the IS 350 but will reduce its displacement to 3.0 liters and add two turbos. Similar to the new Mercedes Benz C400 engine. That would be so ridiculously sick.
I can't imagine they would go with an inline 6 on the IS because those engines are longer, would have to be longitudinally mounted, and probably wouldn't fit into an IS's engine bay.
My real question is, if they go with a turbo’d V6, wouldn’t it have to use two turbos?
I can't imagine they would go with an inline 6 on the IS because those engines are longer, would have to be longitudinally mounted, and probably wouldn't fit into an IS's engine bay.
My real question is, if they go with a turbo’d V6, wouldn’t it have to use two turbos?
Racer
Joined: Jun 2009
Posts: 1,847
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From: PA
I can't think of any V6 off the top of my head that has a single turbo.
Instructor
Joined: Sep 2011
Posts: 770
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From: Fl
What I'm actually suggesting, is that I expect Lexus will stick to using a V6 in the IS 350 but will reduce its displacement to 3.0 liters and add two turbos. Similar to the new Mercedes Benz C400 engine. That would be so ridiculously sick.
I can't imagine they would go with an inline 6 on the IS because those engines are longer, would have to be longitudinally mounted, and probably wouldn't fit into an IS's engine bay.
My real question is, if they go with a turbo’d V6, wouldn’t it have to use two turbos?
I can't imagine they would go with an inline 6 on the IS because those engines are longer, would have to be longitudinally mounted, and probably wouldn't fit into an IS's engine bay.
My real question is, if they go with a turbo’d V6, wouldn’t it have to use two turbos?
They've fit a 2JZ into the 3IS so they could always do something similar with a newer version of a 2JZ. But a Twin Turbo V6 would be awesomely sweet. Could easily get 400hp out of it.
Driver School Candidate
Joined: Nov 2014
Posts: 23
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From: MA
Same here, I came from the 4 bangs 2.0T as well, my previous car was BMW320 F30. My turbo started to whine at around 20000 miles and finally broke down at 32000 miles
I think there is no absolute answer whether 2.0T or the small V6 is better, both have their pros and cons. Not to mention the 3.5 V6, it beats the 2.0T in any aspect except fuel economy.
I got the Lexus IS250 is only because this is almost the only compact luxury car with N/A engine in the market. 320i was my first turbo car, but I only enjoyed driving it for the first 5k miles, the fuel economy was really good and have decent power and torque when I need it. Although it only has 184hp it feel a lot faster than my current IS, probably due to the weight of 320i is almost 200kg less than the IS and best-in-class 8 speed auto. However, the noise and the vibration of the engine have killed most of my enjoyment, especially when cold start or rev it, you would think you were sitting in a 10k budget car. I don't like the turbo lag as well especially when I am in traffic or entering the roundabout. It is hard to predict when will you get the power, the max torque is delivered at 1250 rpm and there is no power below that, if you didn't control the throttle precisely, the car will either not move or jump out when the power comes, it feels like someone suddenly kick your *** to force you to move.
Except the vintage infotainment in the IS and a lot lesser customization of car setting than in the 320i, I am happy switching from the turbo to the underpowered IS250. I don't think it is slow, it has adequate power when I need it but just missing someone always kick my *** to move. Instead, the power delivery is very linear and predictable, most importantly, the engine is very quiet
IMO, riding comfort and reliability are the always the reasons why people would buy the Lexus, performance is not their top priority. but I think adding turbo to any Lexus's is just trying to eliminate these advantages. I am not sure if it can acquire new buyers who look for good performance, while it is still not as fast as the 328i, C250, I don't think it is a good move for Lexus.
I think there is no absolute answer whether 2.0T or the small V6 is better, both have their pros and cons. Not to mention the 3.5 V6, it beats the 2.0T in any aspect except fuel economy.
I got the Lexus IS250 is only because this is almost the only compact luxury car with N/A engine in the market. 320i was my first turbo car, but I only enjoyed driving it for the first 5k miles, the fuel economy was really good and have decent power and torque when I need it. Although it only has 184hp it feel a lot faster than my current IS, probably due to the weight of 320i is almost 200kg less than the IS and best-in-class 8 speed auto. However, the noise and the vibration of the engine have killed most of my enjoyment, especially when cold start or rev it, you would think you were sitting in a 10k budget car. I don't like the turbo lag as well especially when I am in traffic or entering the roundabout. It is hard to predict when will you get the power, the max torque is delivered at 1250 rpm and there is no power below that, if you didn't control the throttle precisely, the car will either not move or jump out when the power comes, it feels like someone suddenly kick your *** to force you to move.
Except the vintage infotainment in the IS and a lot lesser customization of car setting than in the 320i, I am happy switching from the turbo to the underpowered IS250. I don't think it is slow, it has adequate power when I need it but just missing someone always kick my *** to move. Instead, the power delivery is very linear and predictable, most importantly, the engine is very quiet
IMO, riding comfort and reliability are the always the reasons why people would buy the Lexus, performance is not their top priority. but I think adding turbo to any Lexus's is just trying to eliminate these advantages. I am not sure if it can acquire new buyers who look for good performance, while it is still not as fast as the 328i, C250, I don't think it is a good move for Lexus.
I come from the 4 cil 2.0T Turbo world. Last car was a VW GLI 2.0 TFSI, tuned to 260HP (stock 200hp) Mainly electronics, decat, exhaust, etc...
Conclusions:
2.0T way faster and the DSG gear is incomparable. BUT
Eventhough the IS250 is slower...and has a 6speed single clutch gearbox...
I hated the turbo lag. Often after leaving corners. Low end torque was rubbish. But the soft feeling of the 2.5L V6 is incomparable....the sound (just with a hot air sucking takeda air intake}, is sooo good. Driving it at high revs is lovely, and ads a a smile to my face anytime I go over +4000RPM.
If speed is what you want...get a turbo. But if you are able to sacrifice some power, for pleasure and feeling, NA engines are the way to go.
Just my opinion.
Jalil
Conclusions:
2.0T way faster and the DSG gear is incomparable. BUT
Eventhough the IS250 is slower...and has a 6speed single clutch gearbox...
I hated the turbo lag. Often after leaving corners. Low end torque was rubbish. But the soft feeling of the 2.5L V6 is incomparable....the sound (just with a hot air sucking takeda air intake}, is sooo good. Driving it at high revs is lovely, and ads a a smile to my face anytime I go over +4000RPM.
If speed is what you want...get a turbo. But if you are able to sacrifice some power, for pleasure and feeling, NA engines are the way to go.
Just my opinion.
Jalil
Pole Position
Joined: Nov 2014
Posts: 227
Likes: 18
From: Florida
I was able to find a number of google images on how the exhaust plumbing on one side was routed around the V6 to the turbo. Here's a couple if anyone's interested:
http://s27.photobucket.com/user/1chr...003-2.jpg.html
Edit: This second image appears to be an aftermarket manifold that re-routes it across the front, not the back, of the engine.
http://s77.photobucket.com/user/SATA...005-2.jpg.html
Last edited by Machine13; Jul 17, 2015 at 11:16 AM.
Racer
Joined: Jun 2009
Posts: 1,847
Likes: 216
From: PA
Same here, I came from the 4 bangs 2.0T as well, my previous car was BMW320 F30. My turbo started to whine at around 20000 miles and finally broke down at 32000 miles
I think there is no absolute answer whether 2.0T or the small V6 is better, both have their pros and cons. Not to mention the 3.5 V6, it beats the 2.0T in any aspect except fuel economy.
I got the Lexus IS250 is only because this is almost the only compact luxury car with N/A engine in the market. 320i was my first turbo car, but I only enjoyed driving it for the first 5k miles, the fuel economy was really good and have decent power and torque when I need it. Although it only has 184hp it feel a lot faster than my current IS, probably due to the weight of 320i is almost 200kg less than the IS and best-in-class 8 speed auto. However, the noise and the vibration of the engine have killed most of my enjoyment, especially when cold start or rev it, you would think you were sitting in a 10k budget car. I don't like the turbo lag as well especially when I am in traffic or entering the roundabout. It is hard to predict when will you get the power, the max torque is delivered at 1250 rpm and there is no power below that, if you didn't control the throttle precisely, the car will either not move or jump out when the power comes, it feels like someone suddenly kick your *** to force you to move.
Except the vintage infotainment in the IS and a lot lesser customization of car setting than in the 320i, I am happy switching from the turbo to the underpowered IS250. I don't think it is slow, it has adequate power when I need it but just missing someone always kick my *** to move. Instead, the power delivery is very linear and predictable, most importantly, the engine is very quiet
IMO, riding comfort and reliability are the always the reasons why people would buy the Lexus, performance is not their top priority. but I think adding turbo to any Lexus's is just trying to eliminate these advantages. I am not sure if it can acquire new buyers who look for good performance, while it is still not as fast as the 328i, C250, I don't think it is a good move for Lexus.
I think there is no absolute answer whether 2.0T or the small V6 is better, both have their pros and cons. Not to mention the 3.5 V6, it beats the 2.0T in any aspect except fuel economy.
I got the Lexus IS250 is only because this is almost the only compact luxury car with N/A engine in the market. 320i was my first turbo car, but I only enjoyed driving it for the first 5k miles, the fuel economy was really good and have decent power and torque when I need it. Although it only has 184hp it feel a lot faster than my current IS, probably due to the weight of 320i is almost 200kg less than the IS and best-in-class 8 speed auto. However, the noise and the vibration of the engine have killed most of my enjoyment, especially when cold start or rev it, you would think you were sitting in a 10k budget car. I don't like the turbo lag as well especially when I am in traffic or entering the roundabout. It is hard to predict when will you get the power, the max torque is delivered at 1250 rpm and there is no power below that, if you didn't control the throttle precisely, the car will either not move or jump out when the power comes, it feels like someone suddenly kick your *** to force you to move.
Except the vintage infotainment in the IS and a lot lesser customization of car setting than in the 320i, I am happy switching from the turbo to the underpowered IS250. I don't think it is slow, it has adequate power when I need it but just missing someone always kick my *** to move. Instead, the power delivery is very linear and predictable, most importantly, the engine is very quiet
IMO, riding comfort and reliability are the always the reasons why people would buy the Lexus, performance is not their top priority. but I think adding turbo to any Lexus's is just trying to eliminate these advantages. I am not sure if it can acquire new buyers who look for good performance, while it is still not as fast as the 328i, C250, I don't think it is a good move for Lexus.
Driver School Candidate
Joined: Nov 2014
Posts: 23
Likes: 0
From: MA
I test-drove the 328 before I got the 320, yes it is a lot faster and have more fun to drive, but I don't need that extra power so decided to spend the money on the options. Deal breaker was the turbo lag on the 328i is more annoying than the 320i, if this was not my right leg problem i guess it was because both use the same engine but only different in compress ratio and turbo boost.
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