Supercharger measurements. (long rant)
03-23-2004, 02:40 PM
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Supercharger measurements. (long rant)
Can I take some measurements that will help the supercharger project while I have the intake off my ABZ? I need directions for the measurements quickly as I will install it tomorrow or the day after tomorrow.
BTW, it looks like the Lysholm 2300AX will fit upside down between the banks (tight fit). This is important since we need to keep a 8-12" tuned runner if we don't want to boost the crap out of the engine to make up for the lost intake tuning. (I see 50hp difference between the long and the short runner setting on my ABZ.)
I made an excel worksheet for the LYS2300 suprercharger where I have plotted the resulting boost from the VE of the engine vs the VE of the supercharger. From that I calculated the resulting power and the parasitic losses of the supercharger. It looks like a 0.3bar setting in the midrange will give around 400hp at 6500rpm. The combined VE's will result in around 0.5bar boost at 6000rpm, this extend the torque curve quite a bit.
This wasn't at all what I wanted for the Audi 80 4.2Q but I think that the flat torque curve will be very nice in the heavy A8.
After seeing the terrible finish of the ABZ intake manifold I think that the supercharger intake can be built to add an addtional 10-15hp. Adding a free flowing filter, richening the lean audi setting and opening up the exhaust will probably let the mild Lysholm charged engine produce 425-450hp!
Fitting 30-40% larger injectors is a must and I would never try to run an ABZ with a supercharger without water injection.
BTW, can someone tell me if the M90 is a true Lyshom screw supercharger or is it some compromize between a roots and a Lysholm?
In other words, does it compress the air within the supercharger as a Lysholm or is it _only_ compressing the air by feeding the engine with more then it can swallow? (like a roots)
I know that Eaton manufacture superchargers under a Lysholm license and that Lysholm previously manufactured superchargers for Eaton.
BTW, it looks like the Lysholm 2300AX will fit upside down between the banks (tight fit). This is important since we need to keep a 8-12" tuned runner if we don't want to boost the crap out of the engine to make up for the lost intake tuning. (I see 50hp difference between the long and the short runner setting on my ABZ.)
I made an excel worksheet for the LYS2300 suprercharger where I have plotted the resulting boost from the VE of the engine vs the VE of the supercharger. From that I calculated the resulting power and the parasitic losses of the supercharger. It looks like a 0.3bar setting in the midrange will give around 400hp at 6500rpm. The combined VE's will result in around 0.5bar boost at 6000rpm, this extend the torque curve quite a bit.
This wasn't at all what I wanted for the Audi 80 4.2Q but I think that the flat torque curve will be very nice in the heavy A8.
After seeing the terrible finish of the ABZ intake manifold I think that the supercharger intake can be built to add an addtional 10-15hp. Adding a free flowing filter, richening the lean audi setting and opening up the exhaust will probably let the mild Lysholm charged engine produce 425-450hp!
Fitting 30-40% larger injectors is a must and I would never try to run an ABZ with a supercharger without water injection.
BTW, can someone tell me if the M90 is a true Lyshom screw supercharger or is it some compromize between a roots and a Lysholm?
In other words, does it compress the air within the supercharger as a Lysholm or is it _only_ compressing the air by feeding the engine with more then it can swallow? (like a roots)
I know that Eaton manufacture superchargers under a Lysholm license and that Lysholm previously manufactured superchargers for Eaton.
