litchfield twin scroll turbo
31 January 2011, 10:50 AM
#782
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if the WG is jammed, and not opening ie shut - the turbo would spool fast and overboost a ton!
if your car doesn't have AVCS, don't expect the same spool levels as variable cams play an important role in the torque/spool curve
if your car doesn't have AVCS, don't expect the same spool levels as variable cams play an important role in the torque/spool curve
15 March 2011, 02:27 PM
#783
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The new Billet LM400's are scheduled to be ready to ship, the end of this week / start of next.
As soon as these are ready to rock I will drop my car off to Litchfield's (next week all being well). The turbo will be taken straight off and sent to Turbo Dynamics for the new Billet core to be fitted. 48hrs later the car will be back with me. Richard Bulmer (Tracktive Solutions) will (in the meantime) send me a "safe" map that I can program the ECU with (using ECUTEK's Easy ECU) and then it will be straight up to Richard for the car to be remapped properly.
With the Lord Almighty on my side this may all be done next week.
Iain has divulged to me the testing that he has done on the production spec Billet LM400. His results are very "pleasing", but it needs to be fitted on my car before I feel comfortable shouting about any performance stats.
Fingers crossed I will have a chunk of updates next week.
Any news will be posted on my Project thread.
As soon as these are ready to rock I will drop my car off to Litchfield's (next week all being well). The turbo will be taken straight off and sent to Turbo Dynamics for the new Billet core to be fitted. 48hrs later the car will be back with me. Richard Bulmer (Tracktive Solutions) will (in the meantime) send me a "safe" map that I can program the ECU with (using ECUTEK's Easy ECU) and then it will be straight up to Richard for the car to be remapped properly.
With the Lord Almighty on my side this may all be done next week.
Iain has divulged to me the testing that he has done on the production spec Billet LM400. His results are very "pleasing", but it needs to be fitted on my car before I feel comfortable shouting about any performance stats.
Fingers crossed I will have a chunk of updates next week.
Any news will be posted on my Project thread.
15 March 2011, 06:32 PM
#785
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I have no idea on the price for the outright purchase or the core upgrade for existing LM "non Billet" owners.
If Iain does not see this and answer I will get the information next week.
If Iain does not see this and answer I will get the information next week.
20 March 2011, 10:30 PM
#787
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Has anyone fitted / tried the LM500 version yet, the reason I ask is that my engine is being rebuilt/uprated at the moment and will be capable of running around 600bhp without issue, but I'm not going to push it and will be happy with around 500bhp. 
I understand the LM500 will not spool as quickly as an LM400 but I suppose it is a pay off between spool and bhp.
The reason that I'm looking towards the LM500 is that it's a standard fitment turbocharger and it will allow me to retain the twin scroll setup which is why I bought a Spec C.
I understand the LM500 will not spool as quickly as an LM400 but I suppose it is a pay off between spool and bhp.
The reason that I'm looking towards the LM500 is that it's a standard fitment turbocharger and it will allow me to retain the twin scroll setup which is why I bought a Spec C.
21 March 2011, 11:43 PM
#790
Has anyone fitted / tried the LM500 version yet, the reason I ask is that my engine is being rebuilt/uprated at the moment and will be capable of running around 600bhp without issue, but I'm not going to push it and will be happy with around 500bhp.
I understand the LM500 will not spool as quickly as an LM400 but I suppose it is a pay off between spool and bhp.
The reason that I'm looking towards the LM500 is that it's a standard fitment turbocharger and it will allow me to retain the twin scroll setup which is why I bought a Spec C.
I understand the LM500 will not spool as quickly as an LM400 but I suppose it is a pay off between spool and bhp.
The reason that I'm looking towards the LM500 is that it's a standard fitment turbocharger and it will allow me to retain the twin scroll setup which is why I bought a Spec C.
I have considered this myself 
22 March 2011, 09:10 PM
#793
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I have a single entry LM500 fitted to my built 2.5, booked in for the final map on the 30th March 
If anyone is interested i'll post up the results too.
Dave
If anyone is interested i'll post up the results too.
Dave
22 March 2011, 09:55 PM
#794
29 March 2011, 10:40 PM
#796
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Spoken to Litchfields today and the new LM Billet Wheels are ready to ship/fit!!!
The car is booked in with Litchfields this Saturday and the plan is for me to pick the car up the following Friday. The current LM will be taken off, sent to Turbo Dynamics, the new Billet core fitted and sent back to Litchfields for fitment. I will then hopefully get Tracktive to remap on that Friday or the Saturday. All being well I will have some information on testing that weekend, which will go in my Project Thread.
MelTypeR who has a LM450 equipped JDM is up at Litchfields this Saturday. He has kindly offered to let me have a drive in his car to see what I think of his LM450 (non Billet) turbo. I *may* decide to give the Billet version of that turbo a go, depending on how the test drive goes If nothing else it will provide some good feedback that I will of course give on my Project Thread this weekend.
Based on some information Mel has given me (an unbiased view - which in reality matches what Iain has already told me) I already suspect I will stick with the Billet LM400, due to the fact that I am keen on driveability over increased outright power. However, I will remain open minded as the real world "feel" of the LM450 (which should only improve with the Billet version) may not be such a problem.
It will be interesting to see how this pans out.
The car is booked in with Litchfields this Saturday and the plan is for me to pick the car up the following Friday. The current LM will be taken off, sent to Turbo Dynamics, the new Billet core fitted and sent back to Litchfields for fitment. I will then hopefully get Tracktive to remap on that Friday or the Saturday. All being well I will have some information on testing that weekend, which will go in my Project Thread.
MelTypeR who has a LM450 equipped JDM is up at Litchfields this Saturday. He has kindly offered to let me have a drive in his car to see what I think of his LM450 (non Billet) turbo. I *may* decide to give the Billet version of that turbo a go, depending on how the test drive goes If nothing else it will provide some good feedback that I will of course give on my Project Thread this weekend.
Based on some information Mel has given me (an unbiased view - which in reality matches what Iain has already told me) I already suspect I will stick with the Billet LM400, due to the fact that I am keen on driveability over increased outright power. However, I will remain open minded as the real world "feel" of the LM450 (which should only improve with the Billet version) may not be such a problem.
It will be interesting to see how this pans out.
29 March 2011, 10:55 PM
#798
Am in the que aswell LM400 me thinks, Shaun will be good to get your view on the 450. However will the billet wheel compensate for better spool up in the ML450?
Any chance we can get some back to back testing on a air field /track would be good to see how they compare.
Any chance we can get some back to back testing on a air field /track would be good to see how they compare.
Last edited by juggers; 29 March 2011 at 10:56 PM.
29 March 2011, 10:58 PM
#799
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Dropping the car off at Tracktive tomorrow for the final maps on the LM500 
I'll try to post up some results / feedback on Thursday although i might be out wasting some petrol
Dave
I'll try to post up some results / feedback on Thursday although i might be out wasting some petrol
Dave
29 March 2011, 11:01 PM
#800
29 March 2011, 11:28 PM
#802
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Tim,
Give him a call. He has been rather busy recently and has just had to contend with a new addition to the family. He did say to me he didn't know whether he was coming or going at the moment, what with not getting much sleep over the past week or so. lol I don't know if the Billet 500's are ready.... I only know about the 400 and 450.
Immy,
It will be good to compare... that's for sure. In theory the LM450 should better than the LM400 on track, as you are normally in the higher rev band so low down spool is not as much of an issue. The thing is that my car is a road car... not a track car. Hence the hesitation until I drive the LM450 on the road.
Dave,
Sounds good. Let us know how you get on.
I assume your car is a 2.5 then.
Give him a call. He has been rather busy recently and has just had to contend with a new addition to the family.
He did say to me he didn't know whether he was coming or going at the moment, what with not getting much sleep over the past week or so. lol I don't know if the Billet 500's are ready.... I only know about the 400 and 450.Immy,
It will be good to compare... that's for sure. In theory the LM450 should better than the LM400 on track, as you are normally in the higher rev band so low down spool is not as much of an issue. The thing is that my car is a road car... not a track car. Hence the hesitation until I drive the LM450 on the road.
Dave,
Sounds good. Let us know how you get on.
I assume your car is a 2.5 then.
30 March 2011, 12:24 PM
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Hey all,
For a novice to JDMs, can anyone explain what a billet turbo is and what the dufference is between "twin scroll" and "twin turbo". With twin scroll is it one turbo but with two entry points for exhaust gases depending on revs?
cheers,
Andy
For a novice to JDMs, can anyone explain what a billet turbo is and what the dufference is between "twin scroll" and "twin turbo". With twin scroll is it one turbo but with two entry points for exhaust gases depending on revs?
cheers,
Andy
30 March 2011, 12:49 PM
#804
Scooby Regular
Twin scroll has two separate internal volutes, whereas twin entry has two separate entries but then in to a single internal volute.
A Billet Turbo is one that uses a wheel that is made from Billet. Billet is stronger and lighter than cast metal. The fact that it is stronger means the centre of the wheel can be smaller and the blade length physically longer, but overall diameter of of the core will be the same. This ultimately means more air can be shifted, resulting in more BHP.
The reverse of this is that the blade length can be kept the same as non billet, but because the centre of the wheel is smaller the overall diameter of the wheel is smaller which should provide not only the same power as the non billet equivalent, but will also better response and spool.
That's the theory and turbo specification is key to what you actually want to achieve. You can't have anything for nothing, but the Billet cores provide you with more options.
A Billet Turbo is one that uses a wheel that is made from Billet. Billet is stronger and lighter than cast metal. The fact that it is stronger means the centre of the wheel can be smaller and the blade length physically longer, but overall diameter of of the core will be the same. This ultimately means more air can be shifted, resulting in more BHP.
The reverse of this is that the blade length can be kept the same as non billet, but because the centre of the wheel is smaller the overall diameter of the wheel is smaller which should provide not only the same power as the non billet equivalent, but will also better response and spool.
That's the theory and turbo specification is key to what you actually want to achieve. You can't have anything for nothing, but the Billet cores provide you with more options.
30 March 2011, 07:09 PM
#806
Twin scroll is a turbo that has two exhaust gas entry ports to the turbo housing, with two exhaust gas driven turbines being driven by these two gas flows, both turbines are mounted to the same shaft which drives the inlet compressor wheel. This means you can run smaller turbine wheels for the same overall gas flow, which helps improve response and tends to allow an improvement in overall gas flow too. This is why the JDM twin scroll turbos spool up faster than the single scroll UK offerings and also in stock form can produce more torque.
Billet turbo just means that the inlet compressor wheel, the part that forces the air into the engine, is made from a single piece of material that is CNC machined into shape, a none billet compressor wheel is made by casting the material into the finished shape, so has more posibility to have imperfections in the wheel core material, which means they tend to cast them larger than is required if the material was perfect.
The LM series of turbos is designed to bolt on to the stock twin scroll headers and up pipe, so is an easy to install alternative for larger power requirements than the stock turbos can provide. The previous alternatives to upping the power on a JDM car used to be replacing the headers and up pipe with a single scroll setup as per the UK car, which was always a pity to do as the twin scroll headers and up pipe are a very good piece of kit.
30 March 2011, 09:02 PM
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Twin turbo is two physical turbo's fitted to the engine.
Twin scroll is a turbo that has two exhaust gas entry ports to the turbo housing, with two exhaust gas driven turbines being driven by these two gas flows, both turbines are mounted to the same shaft which drives the inlet compressor wheel. This means you can run smaller turbine wheels for the same overall gas flow, which helps improve response and tends to allow an improvement in overall gas flow too. This is why the JDM twin scroll turbos spool up faster than the single scroll UK offerings and also in stock form can produce more torque.
Billet turbo just means that the inlet compressor wheel, the part that forces the air into the engine, is made from a single piece of material that is CNC machined into shape, a none billet compressor wheel is made by casting the material into the finished shape, so has more posibility to have imperfections in the wheel core material, which means they tend to cast them larger than is required if the material was perfect.
The LM series of turbos is designed to bolt on to the stock twin scroll headers and up pipe, so is an easy to install alternative for larger power requirements than the stock turbos can provide. The previous alternatives to upping the power on a JDM car used to be replacing the headers and up pipe with a single scroll setup as per the UK car, which was always a pity to do as the twin scroll headers and up pipe are a very good piece of kit.
Twin scroll is a turbo that has two exhaust gas entry ports to the turbo housing, with two exhaust gas driven turbines being driven by these two gas flows, both turbines are mounted to the same shaft which drives the inlet compressor wheel. This means you can run smaller turbine wheels for the same overall gas flow, which helps improve response and tends to allow an improvement in overall gas flow too. This is why the JDM twin scroll turbos spool up faster than the single scroll UK offerings and also in stock form can produce more torque.
Billet turbo just means that the inlet compressor wheel, the part that forces the air into the engine, is made from a single piece of material that is CNC machined into shape, a none billet compressor wheel is made by casting the material into the finished shape, so has more posibility to have imperfections in the wheel core material, which means they tend to cast them larger than is required if the material was perfect.
The LM series of turbos is designed to bolt on to the stock twin scroll headers and up pipe, so is an easy to install alternative for larger power requirements than the stock turbos can provide. The previous alternatives to upping the power on a JDM car used to be replacing the headers and up pipe with a single scroll setup as per the UK car, which was always a pity to do as the twin scroll headers and up pipe are a very good piece of kit.
(Yours wasn't at all bad too Shaun
).Andy
03 April 2011, 08:59 AM
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Hi Shaun,
While you were at Iains if you made it this Saturday , did you notice a sad looking T25 Hawk eye in the corner of the work shop?
Its been there since September , belive it or not! I hope to have it back soon and manage to get it down to the B.H.P. show at Lydden race circuit May bank hol.
Iain reassures me I will be a proud owner of a Lm 500 turboed car by then.
Paul.
While you were at Iains if you made it this Saturday , did you notice a sad looking T25 Hawk eye in the corner of the work shop?
Its been there since September , belive it or not! I hope to have it back soon and manage to get it down to the B.H.P. show at Lydden race circuit May bank hol.
Iain reassures me I will be a proud owner of a Lm 500 turboed car by then.
Paul.
04 April 2011, 09:52 AM
#810
Scooby Regular
Spoken to Litchfields today and the new LM Billet Wheels are ready to ship/fit!!!
.....
.....
MelTypeR who has a LM450 equipped JDM is up at Litchfields this Saturday. He has kindly offered to let me have a drive in his car to see what I think of his LM450 (non Billet) turbo. I *may* decide to give the Billet version of that turbo a go, depending on how the test drive goes If nothing else it will provide some good feedback that I will of course give on my Project Thread this weekend.
Based on some information Mel has given me (an unbiased view - which in reality matches what Iain has already told me) I already suspect I will stick with the Billet LM400, due to the fact that I am keen on driveability over increased outright power. However, I will remain open minded as the real world "feel" of the LM450 (which should only improve with the Billet version) may not be such a problem.
It will be interesting to see how this pans out.
.....
.....
MelTypeR who has a LM450 equipped JDM is up at Litchfields this Saturday. He has kindly offered to let me have a drive in his car to see what I think of his LM450 (non Billet) turbo. I *may* decide to give the Billet version of that turbo a go, depending on how the test drive goes If nothing else it will provide some good feedback that I will of course give on my Project Thread this weekend.
Based on some information Mel has given me (an unbiased view - which in reality matches what Iain has already told me) I already suspect I will stick with the Billet LM400, due to the fact that I am keen on driveability over increased outright power. However, I will remain open minded as the real world "feel" of the LM450 (which should only improve with the Billet version) may not be such a problem.
It will be interesting to see how this pans out.
thks