Supercharged Ultimas on race track
Discussion
deadscoob said:
What F.C. said.
What engine do you currently have?
It’s “easy” to make a Porsche turbo quicker and faster in a straight line than a 500hp Ultima.
Current turbo S does 0-100 in a smudge over 6 secs so also quicker than most 500hp quoted Ultimas.
I think lots of ow era over estimate their power btw.
I think you are right about power estimates.What engine do you currently have?
It’s “easy” to make a Porsche turbo quicker and faster in a straight line than a 500hp Ultima.
Current turbo S does 0-100 in a smudge over 6 secs so also quicker than most 500hp quoted Ultimas.
I think lots of ow era over estimate their power btw.
Unless they have been RR tested by a no BS outfit you will never know as a lot of claims made by "kit" suppliers are optimistic and also set up makes a major difference,
Mine is 500-550 BHP at the tyre (low boost 2psi) and I know that there's not a standard GT3 will out drag it.
I'd like to have a comparison with a current Turbo S that would be a close call, PDK is a major advantage here I think.
humble said:
I don't have a root cause yet, but my best guess right now is oil foaming/aeration, reduced lubricity and spun big end bearing that went as badly as it could go. Insurance has been slow because of the holidays, but I'm finally getting traction now, so I'll be able to tear the car down soon to see what actually happened.
Will
A spun bearing is caused by either no clearance or no oil. If it was a clearance issue the failure would have been soon after startup. So, for some reason you had an oiling issue.Will
As an aside, what do people think of the ARE dry sumps?
Boosted LS1 said:
humble said:
I don't have a root cause yet, but my best guess right now is oil foaming/aeration, reduced lubricity and spun big end bearing that went as badly as it could go. Insurance has been slow because of the holidays, but I'm finally getting traction now, so I'll be able to tear the car down soon to see what actually happened.
Will
A spun bearing is caused by either no clearance or no oil. If it was a clearance issue the failure would have been soon after startup. So, for some reason you had an oiling issue.Will
As an aside, what do people think of the ARE dry sumps?
https://ls1tech.com/forums/generation-iv-internal-...
The stock oiling system on the LS7 is not up to the task for anything half serious. I've ordered an Aviaid oil pan trap and baffle and single stage auxiliary scavenge pump as one of the first mods on the GTR I just bought.
Addressing the OP question about superchargers and heat, I don't have experience with positive displacement type blowers more commonly used on road going V8s or Ultima specific experience, but did run a centrifugal supercharged 3 litre Porsche 944 for several years reliably in a Dubai GT race series.
High track temperatures meant that heat issues were always a concern, but my experience with the centrifugal blower setup was that unlike a similar power level turbo setup, common on the 944, it added relatively little to the overall heat output in the engine bay , and with a decent intercooler inlet temperatures were not much above ambient.
A centrifugal blower would probably be a b
h to fit on an Ultima, but not impossible. Extra horsepower inevitably means extra heat output to be managed regardless how you achieve it, but a low boost centrifugal setup would easily get you the power output you are looking for without adding too much heat in and of itself. Plus they give you a nice torque curve with power added higher in the rev range, which suits track driving better than just more low end power from a displacement blower.
High track temperatures meant that heat issues were always a concern, but my experience with the centrifugal blower setup was that unlike a similar power level turbo setup, common on the 944, it added relatively little to the overall heat output in the engine bay , and with a decent intercooler inlet temperatures were not much above ambient.
A centrifugal blower would probably be a b
h to fit on an Ultima, but not impossible. Extra horsepower inevitably means extra heat output to be managed regardless how you achieve it, but a low boost centrifugal setup would easily get you the power output you are looking for without adding too much heat in and of itself. Plus they give you a nice torque curve with power added higher in the rev range, which suits track driving better than just more low end power from a displacement blower.Edited by OziSteve on Tuesday 15th January 02:57
OziSteve said:
The following link is a really worthwhile read if you are interested in limitations of the LS7's "dry sump" system for track work. Real experience from the NZ V8 SuperTourers series where they ran crate LS7s.
https://ls1tech.com/forums/generation-iv-internal-...
The stock oiling system on the LS7 is not up to the task for anything half serious. I've ordered an Aviaid oil pan trap and baffle and single stage auxiliary scavenge pump as one of the first mods on the GTR I just bought.
That link is very interesting and informative reading. Hadn't seen it before despite my lurking on the ls1tech forum https://ls1tech.com/forums/generation-iv-internal-...
The stock oiling system on the LS7 is not up to the task for anything half serious. I've ordered an Aviaid oil pan trap and baffle and single stage auxiliary scavenge pump as one of the first mods on the GTR I just bought.
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