Impeller speeds
Drifting
Joined: Oct 2006
Posts: 1,984
Likes: 16
From: Amityville New York
The answer to your question depends on the application being used, are you going to use the same size motor you had before, are you using the same size heads you had before, same size valves, same size cam? now those are the answers you will have to consider first, then if not, there will be alot of other things to think about, if the heads are flowing better and the cubic inch are the same, the boost gage might read the same as before but the motor will be gaining more power, the boost is a restriction to the motor, the more the motor is restricted, the more boost you see, therefore it is not the restricted boost that makes the power but the CFM that applied to the motor. Now if your heads are flowing better and you down size the pulleys, you might have the same reading on your boost gauge and could be making over 80 to 90 more RWHP.
Melting Slicks
Joined: May 2008
Posts: 2,121
Likes: 2
From: CT
The answer to your question depends on the application beeing used, are you going to use the same size motor you had before, are you using the same size heads you had before, same size valves, same size cam? now those are the answers you will have to consider first, then if not, there will be alot of other things to think about, if the heads are flowing better and the cubic inch are the same, the boost gage might read the same as before but the motor will be gaining more power, the boost is a restriction to the motor, the more the motor is restricted, the more boost you see, therefore it is not the restricted boost that makes the power but the CFM that applied to the motor. Now if your heads are flowing better and you down size the pulleys, you might have the same reading on your boost gauge and could be making over 80 to 90 more RWHP.
the previous reply pretty much answered my question which was also what I was estimating but wanted to see if someone had actually done just that with the same supercharged and the results. So whats your opinion
Safety Car
Joined: Oct 2001
Posts: 4,945
Likes: 0
From: Dallas/Valley Ranch TEXAS!!!
With all of that said, the F1C is a far superior unit, the power and torque under the curve at the same boost level is superior, and the future potential for more boost is obvious... If I knew then what I know now, I'd have started with a F1C and pulley'd up for lower boost, until I wanted more...
Thread Starter
Pro
Joined: Nov 2006
Posts: 636
Likes: 2
From: Lumberton TX
I agree MRBIG. There would probably be extra heat generated, but like BigMay stated, only under long term rpm speeds. The unit only gets spun to the top of the rpm for just a second or two.
Safety Car
Joined: Oct 2001
Posts: 4,945
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From: Dallas/Valley Ranch TEXAS!!!
, and much testing on closed course pulls getting the car setup for the mile, I'm soooooooo disappointed that I had to work last moment this October (also thankful to have a job during these times) and missed the mile this go'round... like I said, from my experience on my setup the assumptions that I also shared before testing were not found to be true... just trying to inform my CF brothers of my findings...
Drifting
Joined: Oct 2006
Posts: 1,984
Likes: 16
From: Amityville New York
Not from my experience... I think the Tx Mile would be more than a second or two at max impeller speed, and would be considered "long term", and much testing on closed course pulls getting the car setup for the mile, I'm soooooooo disappointed that I had to work last moment this October (also thankful to have a job during these times) and missed the mile this go'round... like I said, from my experience on my setup the assumptions that I also shared before testing were not found to be true... just trying to inform my CF brothers of my findings...
, and much testing on closed course pulls getting the car setup for the mile, I'm soooooooo disappointed that I had to work last moment this October (also thankful to have a job during these times) and missed the mile this go'round... like I said, from my experience on my setup the assumptions that I also shared before testing were not found to be true... just trying to inform my CF brothers of my findings...I have been running a D1SC for almost 7yrs and had tried almost every pulley sized until it went to max, we had tested the AIT with every pulley and has noticed a big change in temperature everytime we changed the pulleys, today I am running a F1R and had changed the complete system to a water to air cooling system, I am now looking to make over a grand rwhp through a 4L80E transmission without meth but will use C16 for safety.
Safety Car
Joined: Oct 2001
Posts: 4,945
Likes: 0
From: Dallas/Valley Ranch TEXAS!!!
can't speak for anyone but me, but why anyone would go F.I. Without Methanol injection these days with the ease of safety, and all the failsafe features I just don't understand... If Max impeller speed is even considered on the smallest of the headunits offered for our platform, methanol should have been added to the setup a long time ago... But do what makes you happy, as for N2O being used for IAT's been there done that, still have it installed, that is NOT the answer... Trust me... But when I want to go for BIG power, it'll be a fun bump...
Former Vendor
Joined: May 2003
Posts: 2,173
Likes: 2
From: Dallas Texas
While your graph looks killer for a centri car, its 275-300 ft/lbs down from a TT car with similar engine combos and boost levels
reference link
reference link
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Former Vendor
Joined: Jul 2008
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From: Oxnard SoCal www.aacorvette.com www.superchargersuperstore.com
That is the max "efficient" RPM. The actual max rpm could be substantially higher.
Drifting
Joined: Aug 2009
Posts: 1,412
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From: Texas 1,002rwhp/928rwtq
St. Jude Donor '09-'10
While your graph looks killer for a centri car, its 275-300 ft/lbs down from a TT car with similar engine combos and boost levels
reference link
reference link
Last edited by aTX427; Nov 10, 2009 at 01:51 AM.
Former Vendor
Joined: May 2003
Posts: 2,173
Likes: 2
From: Dallas Texas
Melting Slicks
Joined: May 2008
Posts: 2,121
Likes: 2
From: CT
I think he was saying find another TT that made 2-300 more hp and torque OVERALL that his did on pump has which was 1,002rwhp/928rwtq
You are saying look at the power under the curve and how it comes up much faster with a TT setup. Not total numbers.
Do I have it right?
Drifting
Joined: Aug 2009
Posts: 1,412
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From: Texas 1,002rwhp/928rwtq
St. Jude Donor '09-'10
Most TT's ramp as fast and stay flat. the torque curve on centri's are typically concave and peaky towards the upper end. My point was that by overspinning my blower, it maxed out quickly, but by doing so, it pushed curve to the left, ramped the torque fast and held through the upper RPM range much like a TT does.
Last edited by aTX427; Nov 10, 2009 at 11:25 AM.
Drifting
Joined: Aug 2009
Posts: 1,412
Likes: 0
From: Texas 1,002rwhp/928rwtq
St. Jude Donor '09-'10
I still have not seen a TT making 275-300 lb-ft more in a similar build on pump gas with boost only. Not many cars are making more than 1K on pump, let alone 1,200+ ... on a loaded dyno, in the Texas heat, reliably.
Last edited by aTX427; Nov 10, 2009 at 12:44 PM.
Former Vendor
Joined: May 2003
Posts: 2,173
Likes: 2
From: Dallas Texas
Im talking about area under the curve, John. Sorry for not making that clear, as that is the ONLY downside to a centri car, given the similar boost and engine power levels. The TT graph I posted made the same HP as yours, but 275-300 rwtq more in the lower RPMs.
I run the same timing and fueling tables on meth/pump as I do on C16, its purely for insurance. Why chance a build that took 3 years to come to fruition, and pray the dude at the pump really put 93 in there? I dont know about you, but Im not putting the destiny of my customers engines in the hands of joe blow at the pump
This thread has gotten a bit off topic, Mr Big knows his stuff when it comes to overspinning, he just wont admit it
I run the same timing and fueling tables on meth/pump as I do on C16, its purely for insurance. Why chance a build that took 3 years to come to fruition, and pray the dude at the pump really put 93 in there? I dont know about you, but Im not putting the destiny of my customers engines in the hands of joe blow at the pump
This thread has gotten a bit off topic, Mr Big knows his stuff when it comes to overspinning, he just wont admit it
