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Old 01-08-2012, 06:07 PM   #11
esp3500
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Sorry - Yokohama advans
nitto 555r My 60 ft times suck because I have not upgraded the clutch yet.
But I just sold the roush so I am going to order the forged rotating assy and the 8 bolt flywheel and clutch assy.

My wife is going to be sooooo mad when tear this car down again in a week or so.
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Old 01-08-2012, 06:09 PM   #12
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Sorry - Yokohama advans
are you still stock 3.55 gear?
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Old 01-09-2012, 01:09 AM   #13
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What were your ETs with the m90? Any other mods with it and what tune were you running?
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Old 01-09-2012, 05:00 PM   #14
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Again, how many miles on that m90? I'm not sure how many things I would have to change for a 2010 but it sure wouldn't add up to $2,500.
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Old 01-09-2012, 06:37 PM   #15
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What were your ETs with the m90? Any other mods with it and what tune were you running?
It ws running !/8 mile 8.3's, Not great but I shift grandma style to keep from tearing anything up also.
60 ft was 2.0's with the stock 3.55 gear
The tune was custom from the local tuner ( High speed Performance) no other mods, ran 8.8's stock

Last edited by esp3500; 01-09-2012 at 06:50 PM.
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Old 01-09-2012, 06:38 PM   #16
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Again, how many miles on that m90? I'm not sure how many things I would have to change for a 2010 but it sure wouldn't add up to $2,500.
Nope, it wouldn't work on a 2010, and I sold it today ,But thanks.

Last edited by esp3500; 01-09-2012 at 06:47 PM.
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Old 01-09-2012, 06:53 PM   #17
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I would like to see an actual comparison of the HP/TQ curves. Not so much for the peak numbers but to actually compare the shape of the curves. In theory, the m90 should produce a broad, flat torque curve while the centri should climb to a peak linearly with rpm. Your comparison is not quite apples to apples because you went from an 8psi pulley to a 10psi pulley, but like I said, the shape of the curves is what I'm interested in more than the numbers themselves. The fact that your TQ peak is 600rpm higher with the centri supports this.

All in all, it looks like it was a good upgrade for you. More power and better effieciency. Was either setup intercooled?
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Old 01-10-2012, 08:30 AM   #18
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^^^this...can you post the dyno results?
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Old 01-10-2012, 06:50 PM   #19
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Quote:
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I would like to see an actual comparison of the HP/TQ curves. Not so much for the peak numbers but to actually compare the shape of the curves. In theory, the m90 should produce a broad, flat torque curve while the centri should climb to a peak linearly with rpm. Your comparison is not quite apples to apples because you went from an 8psi pulley to a 10psi pulley, but like I said, the shape of the curves is what I'm interested in more than the numbers themselves. The fact that your TQ peak is 600rpm higher with the centri supports this.

All in all, it looks like it was a good upgrade for you. More power and better effieciency. Was either setup intercooled?
Both setups are intercooled, and you are correct it is not exactly apples for apples, because the paxton never actually hit 10psi because I left the rev limit at 6k rpm so the roush had a big advantage because full boost is at 2k.

Your theory is the reason I first bought the roush, but in practice it just didn't hold water, as I said the paxton made almost as much in the low end and more at the high end.
One possible reason is the fact that it takes so much hp to make that boost so low of an rpm on the roush that they cancel each other out.

You speak of the peak being 600 rpm higher, but look at the rpm that the paxton makes the Roush's Peak Thats what matters. the paxton made the roush's peak hp 500 rpm sooner than the roush and the paxton made the roush peak Torque 1000 rpm sooner than the Roush.

I am copying the dyno sheets now. you will notice the paxton sheet looks a little choppy, but if you look at the sheet they had the buffer set at 50% where as they had it at 99% for the roush because it was choppy also.

Now can anyone tell me how to post these sheets. I have them copied now?

Last edited by esp3500; 01-10-2012 at 07:22 PM.
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Old 01-10-2012, 07:43 PM   #20
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Old 01-10-2012, 07:43 PM
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