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Supercharger vs. N/A...... LS2

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Old Jan 13, 2010 | 04:02 PM
  #161  
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how does the paxton sl1500 compare to the procharger d1sc in terms of peak hp, peak torque and torque curves
Old Jan 13, 2010 | 04:26 PM
  #162  
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Originally Posted by SinisterC6
how does the paxton sl1500 compare to the procharger d1sc in terms of peak hp, peak torque and torque curves
The D1 is a much bigger head unit more comparable to the 2200.

The ECS kit's TQ is from using a restrictor plate to pulley down and not from the head unit. This brings up the low and miband while keeping you from too much on top for the stock shortblock's strength.

The ATI kits dont offer this option.

ECS has a well thought through kit in this area.
Old Jan 13, 2010 | 04:34 PM
  #163  
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Originally Posted by HC Mechanic
Can you enlighten me on why higher rev's can give more hp if set up correctly, does it come down to friction? I understand the math...but not the physics of it.
It is extremely simple: You can only take in so much air with each power stroke, and you can not burn fuel without air. Since it is the burning of the fuel that produces power, more revs = more air going in = more fuel being burned = more power.

Originally Posted by HC Mechanic
With a non-roots style S/C isn't there some delay in spool up time at lower revs? Be interesting to see a graph MAP on the dyno going through the gears, or better yet going down the 1/4.
With something that is belt driven, by definition, it can't have "spool". It is constantly "Spooled" to a multiple of the engine's RPM. Centrifugal superchargers don't make as much low end boost as a positive dsplacement blower, but the boost is always there when you're on the throttle, it doesn't "lag" or "spool".
Old Jan 13, 2010 | 04:42 PM
  #164  
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Originally Posted by SpinMonster
The D1 is a much bigger head unit more comparable to the 2200.

The ECS kit's TQ is from using a restrictor plate to pulley down and not from the head unit. This brings up the low and miband while keeping you from too much on top for the stock shortblock's strength.

The ATI kits dont offer this option.

ECS has a well thought through kit in this area.
i like the idea of the restrictor plate, do you think there is any issue with more boost at lower rpms when talking longevity?
Old Jan 13, 2010 | 04:59 PM
  #165  
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Originally Posted by robz
I agree with above.
What does a base kit make in rwhp rwtq?

This may not be the original discussion but:

I'm debating that a 475rwhp h/c car will trap higher and run a better et than a 550 rwhp s/c car with all else being equal and some seat time by a good driver.
or
Give me a 6 speed s/c ls2 with 600rwhp equal in weight and with similar track conditions as some of those n/a records and the car should run low 10's and high 130's.
475rwhp?? LS3 cam only cars are making more than that. 475rwhp is a 224 cam and LS3 heads totalling about $2200 in parts on an LS2. I do that install for 4500 start to finish. Given the cost match up indicated by the OP, the comparison he asked about was: For the same 6500 or 7000 it costs which performs better?

Doug and Max's input as awesome drivers with factual track experience stating FI needs more HP to match N/a's performance. Im with them. I see you want to compare 475rwhp N/A to 550rwhp on a base kit so I guess the OP's question is answered.

As far as your question; If you can get the car to run the same timing at the end of the run as on a dyno, it should run faster. It hasnt been done yet without Meth injection which isnt part of a base kit.

Once you get meth and even better, a real fuel system, the car will be reliable to 650rwhp on the stock bottom end. For those that dont blow up, this will be a legit mid 130's trap speed and is definitely faster than a H/C install. I never said it wouldnt be.
Old Jan 13, 2010 | 05:07 PM
  #166  
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Originally Posted by SinisterC6
i like the idea of the restrictor plate, do you think there is any issue with more boost at lower rpms when talking longevity?
C'mon, candles that burn twice as bright last half as long. Making 7psi at 4k rpms isnt going to last as long as making 4psi but the degree to what it changes longevity is the real question. If you drive it hard every time you get in it it wont last as long as stock but you can have a long life even in abuse mode. I dont think it impacts longevity like that but keep in mind professionals in this sport that set records break all the time and tear into engines each race.

If you need your car to last 200k miles, dont mod it.

Restrictor plate versus no restrictor plate? I think most damage is done high rpm with too much boost so I will go with no difference in stress on the car. If you need it quantified, I think there would be no difference in longevity from adding 2-3PSI from 3-5k. Damage done to FI motors is from fueling/tune related issues and would happen on either set-up.
Old Jan 13, 2010 | 05:10 PM
  #167  
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