LS Build: In Progress
01-22-2019, 09:47 PM
#31
Registered
Thread Starter
01-23-2019, 07:46 AM
#32
Registered
Update us on how these work. What motors and speed you are pulling out and replacing them with. My biggest concern with no boosted 6.2 LS motors is that they don't have the TQ down low a BBC does. And until someone comes out with a reasonable two speed that could be a issue.
01-23-2019, 08:51 AM
#33
Registered
Thread Starter
Update us on how these work. What motors and speed you are pulling out and replacing them with. My biggest concern with no boosted 6.2 LS motors is that they don't have the TQ down low a BBC does. And until someone comes out with a reasonable two speed that could be a issue.
01-23-2019, 10:16 AM
#34
Platinum Member
Torque Compare
Wildman - I have no baseline as the Hull is new to me. I can compare the dyno sheets from the LS3 to a 509 I had (HP500 w/ AFR305s and a Bob Madeira can). You can compare the torque curves.
Last edited by 242LS; 01-23-2019 at 01:29 PM.
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neuer_Typ (11-04-2021)
01-23-2019, 12:33 PM
#38
Registered
mggdoors
I have been looking at the 6.2SC that GM offers to marine power/ PCM etc with the super charger. Now I hear a LT4 Gen5 direct injection will be coming out very soon. Sounds nice and both would take care of the TQ. Just researching to see if I want to put something together or but from Marine power etc.
How is the water moved through the inter cooler on those, do they use the engine water or a different pump set up?
BTW a 1.5 is a normal ratio for BRavo's not the 1.36
Why is it that the larger LS7 isn't used as a base motor more?
242LS, I compared those same numbers to my HP500EFI and was worried that until you get to 4800-500 rpm the LS was softer. When you are running around and nail it it just seems that you would feel as much pull, granted after 5200 the BBC is done and you keep going but that is only here and there.
BTW
Don't take this as negative, I am looking at the end of the season to repower and for my little 30 I think the LS platform is the way to go. We put a lot of hours on and reducing top end and rebuild times would be nice. Let alone more room in the engine compartment.
I have been looking at the 6.2SC that GM offers to marine power/ PCM etc with the super charger. Now I hear a LT4 Gen5 direct injection will be coming out very soon. Sounds nice and both would take care of the TQ. Just researching to see if I want to put something together or but from Marine power etc.
How is the water moved through the inter cooler on those, do they use the engine water or a different pump set up?
BTW a 1.5 is a normal ratio for BRavo's not the 1.36
Why is it that the larger LS7 isn't used as a base motor more?
242LS, I compared those same numbers to my HP500EFI and was worried that until you get to 4800-500 rpm the LS was softer. When you are running around and nail it it just seems that you would feel as much pull, granted after 5200 the BBC is done and you keep going but that is only here and there.
BTW
Don't take this as negative, I am looking at the end of the season to repower and for my little 30 I think the LS platform is the way to go. We put a lot of hours on and reducing top end and rebuild times would be nice. Let alone more room in the engine compartment.
01-23-2019, 01:24 PM
#39
Registered
Thread Starter
mggdoors
I have been looking at the 6.2SC that GM offers to marine power/ PCM etc with the super charger. Now I hear a LT4 Gen5 direct injection will be coming out very soon. Sounds nice and both would take care of the TQ. Just researching to see if I want to put something together or but from Marine power etc.
How is the water moved through the inter cooler on those, do they use the engine water or a different pump set up?
BTW a 1.5 is a normal ratio for BRavo's not the 1.36
Why is it that the larger LS7 isn't used as a base motor more?
242LS, I compared those same numbers to my HP500EFI and was worried that until you get to 4800-500 rpm the LS was softer. When you are running around and nail it it just seems that you would feel as much pull, granted after 5200 the BBC is done and you keep going but that is only here and there.
BTW
Don't take this as negative, I am looking at the end of the season to repower and for my little 30 I think the LS platform is the way to go. We put a lot of hours on and reducing top end and rebuild times would be nice. Let alone more room in the engine compartment.
I have been looking at the 6.2SC that GM offers to marine power/ PCM etc with the super charger. Now I hear a LT4 Gen5 direct injection will be coming out very soon. Sounds nice and both would take care of the TQ. Just researching to see if I want to put something together or but from Marine power etc.
How is the water moved through the inter cooler on those, do they use the engine water or a different pump set up?
BTW a 1.5 is a normal ratio for BRavo's not the 1.36
Why is it that the larger LS7 isn't used as a base motor more?
242LS, I compared those same numbers to my HP500EFI and was worried that until you get to 4800-500 rpm the LS was softer. When you are running around and nail it it just seems that you would feel as much pull, granted after 5200 the BBC is done and you keep going but that is only here and there.
BTW
Don't take this as negative, I am looking at the end of the season to repower and for my little 30 I think the LS platform is the way to go. We put a lot of hours on and reducing top end and rebuild times would be nice. Let alone more room in the engine compartment.
The LS7 if you want my opinion is good when they run. Expensive. Do sime research online and you will find quiet a few failures fir such a small produced engine.
I get that the 1.5 is stock but my point was that my daytona had 1.36 and by switching to 1.5 it allows me to amplify prop torque as well as spin in the rpm range I am intending while still maintaining the est speed we will be seeing (107-115)
01-23-2019, 01:52 PM
#40
Torque diff
From the dyno sheets, with the exception of 6300+ RPM, the largest gap is at 4600 RPM, about 46 ft lbs. That’s only an 8% gap.
By the numbers, it looks negligible to me. Does anyone have any real world experience of what that level of difference actually feels like? Can you even notice 8% difference? ...maybe the amazing sound will distract all other senses ��
And wouldn’t the weight difference offset it?
(...and between 3650-4100 RPM, the LS has more torque than the 509)
By the numbers, it looks negligible to me. Does anyone have any real world experience of what that level of difference actually feels like? Can you even notice 8% difference? ...maybe the amazing sound will distract all other senses ��
And wouldn’t the weight difference offset it?
(...and between 3650-4100 RPM, the LS has more torque than the 509)
Last edited by 242LS; 01-23-2019 at 06:26 PM.
