12-21-2011, 01:35 PM | #15 | |
Logic is dead
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Quote:
The LSA being what I call a "LS9-lite", has the smaller 1.9L blower and a slightly lower CR at 9.1. Personally, I'm not super comfortable with that CR area. I'm sure in near-stock applications, it provides more forgiveness at slightly higher boost levels with 93 octane, and less need for adjustments to timing retard. However, To say, "at X boost, you will need forged engine components" is difficult and matter of opinion to a certain degree. But dished pistons, and you would probably go forged, would help drop that CR to the 8.5 to 8.8 range. This is where I would get a bit more comfortable with higher boost. Also, some work to the heads to expand the combustion chamber will also help lower the CR. At this point, all of this is a matter of personal comfort. Some people will up the boost with little more than higher octane. Tuning plays a big part from a security aspect, but to really get big boost numbers I think that the static CR is going to have to be in the LOW 8.X range to really get crazy with higher boost.
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2010 Camaro 2SS/RS (LS3)
573 RWHP 498 RWTQ - Vortech V3 Supercharger - Kooks Stepped Headers, Magnaflow 16580 - Suspension by Pfadt, Hotchkis. 2007 Trailblazer SS- Sold 2001 Trans Am WS6 431 RWHP 408 RWTQ - Sold 1994 Camaro Z28 - Sold |
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12-21-2011, 01:50 PM | #16 |
Logic is dead
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Also, just talked to one of my buddies with a CTS-V. He is telling me he picked up right around 75 RWHP with a switch to the 9.5" lower pulley and dyno tune. Not saying this is a direct correlation to what the ZL1 can gain, but at least gives an idea.
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2010 Camaro 2SS/RS (LS3)
573 RWHP 498 RWTQ - Vortech V3 Supercharger - Kooks Stepped Headers, Magnaflow 16580 - Suspension by Pfadt, Hotchkis. 2007 Trailblazer SS- Sold 2001 Trans Am WS6 431 RWHP 408 RWTQ - Sold 1994 Camaro Z28 - Sold |
12-21-2011, 01:52 PM | #17 |
THE CAMARO KING
Drives: 2012 Camaro ZL1 on order #PZSD7S Join Date: Aug 2006
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Yes, the lower CR the better...
as the octane rating of gasoline decreases and the demand for more horsepower increase, (we always want more HP right?) there is more of a possibility for detonation. Forged pistons made for blown systems are highly recommended. Also using 8.5 to 9.1 compression ratio and less blower boost will keep the engine cooler. When you run a lower compression engine and raise the boost levels, this elevates the temperature of the air charge to your engine, (remember the more colder air coming in the better) requiring you to buy higher octane gasoline (or make your own octane as some do) to suppress detonation. Gonna be fun to have a factory built supercharged camaro for a change.. and one more thing.. Don't run just regular gas... I bet it will be sure to have detonation issues if you do!
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2012 Camaro ZL1 Car Name: Bruce
ZL1, LSA, MN6/MG9, DSX, RTQ, VR, Current Status: 2030 1000 Initial Order 11/11/2011 Chevyland 1100 Order accepted at dealer: 11/11/2011 - PZSD7S 2000 Order accepted by GM: 12/14/2011 3000 Accepted By Production Control: 00/00/2011 - TPW 00/00/2011 3100 Sequenced: 00/00/2011 3300 Scheduled For Production:0/0/2012 3400 Broadcast: 0/0/2012 3800 Produced: 0/0/2012 4000 Available To Ship: 0/0/2012 4200 Shipped: 0/0/2012 5000 Delivered To The Dealer: 0/0/2012 6000 Delivered To Customer:0/0/2012 |
12-21-2011, 02:01 PM | #18 |
Drives: '98 Camaro Z28, '06 Z06 Join Date: Feb 2011
Location: Missouri
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Good question, I don't know.. Sucks I can't even get 93 octane anywhere close. Only have 91.
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'10 Camaro 2SS/RS A6 Sold :( ARH, FM Super 44's, K&N CAI, ADM scoop, Diablo Tune, RX catch can.
'98 Camaro Z28 M6 TSP headers, true duals, AIR/EGR/AC/muffler delete, CAI, Subframe con., shock tower brace, Stg. 2 T56 rebuild. Monster Clutch Stg. 2, Electric Water Pump, TT2 wheels, 315 NT555's '06 Z06 2LZ, Cam, P/P/M Heads, FAST Intake/TB, ARH, CAI, HP Clutch/FW, C5 Axles, Pfadt Coilovers/Poly Bushings, Carbon Fiber: Everything, lol. HID's, 360 Forged Spec 5's/Invo's, Custom Interior. 550 RWHP http://www.camaro5.com/forums/showthread.php?t=235911 |
12-21-2011, 02:43 PM | #19 |
Drives: 2012 Camaro ZL1 Join Date: Dec 2011
Location: Detroit
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I am so ignorant, but what does the lower pulley control? Does it spin the supercharger faster?
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12-21-2011, 02:58 PM | #20 |
Drives: C6 Z06 Join Date: Jan 2010
Location: Dayton, MD
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12-21-2011, 03:15 PM | #21 | |
Logic is dead
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Quote:
Think of the pulleys in a similar way to rear end gears. When you change the ratio on your rear end, you change the characteristics of the cars performance. Higher gear ratio, more lower end drive (car gets up and moves faster, but lower top speed potential). Lower gear ratio, more higher end drive (car builds speed at a different rate, but can reach higher top end speed).
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2010 Camaro 2SS/RS (LS3)
573 RWHP 498 RWTQ - Vortech V3 Supercharger - Kooks Stepped Headers, Magnaflow 16580 - Suspension by Pfadt, Hotchkis. 2007 Trailblazer SS- Sold 2001 Trans Am WS6 431 RWHP 408 RWTQ - Sold 1994 Camaro Z28 - Sold |
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12-22-2011, 08:48 AM | #22 |
Drives: CGM SS 6spd manual Join Date: Aug 2009
Location: Surrey bc canada
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This is a great topic.!
I'm also wondering what the factory boost would be.. i assume somewhere around 7lbs because of Engineered safety margins?? im sure you can run higher boost by changing the pulley ratio, but the inverse side of that is that you cant always have you foot in it.. Currently they are tested at 100% duty cycles, but with increased boost,.. one would probably scale back the abuse if staying with stock internals?? I wonder if the the new GT500 is built to be run all out all the time?.. is the ford setup pushed to its max from the factory? |
12-22-2011, 08:51 AM | #23 | |
Logic is dead
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Duty cycles generally refers to injector output capability. There is no way the stock injectors are running at 100% duty cycle. That would be like playing russian roulette... and on a stock, factory car, that would be russian roulette with 5 of 6 chambers holding a bullet.
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2010 Camaro 2SS/RS (LS3)
573 RWHP 498 RWTQ - Vortech V3 Supercharger - Kooks Stepped Headers, Magnaflow 16580 - Suspension by Pfadt, Hotchkis. 2007 Trailblazer SS- Sold 2001 Trans Am WS6 431 RWHP 408 RWTQ - Sold 1994 Camaro Z28 - Sold |
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12-22-2011, 09:02 AM | #24 | ||
Drives: '98 Camaro Z28, '06 Z06 Join Date: Feb 2011
Location: Missouri
Posts: 533
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Quote:
Quote:
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'10 Camaro 2SS/RS A6 Sold :( ARH, FM Super 44's, K&N CAI, ADM scoop, Diablo Tune, RX catch can.
'98 Camaro Z28 M6 TSP headers, true duals, AIR/EGR/AC/muffler delete, CAI, Subframe con., shock tower brace, Stg. 2 T56 rebuild. Monster Clutch Stg. 2, Electric Water Pump, TT2 wheels, 315 NT555's '06 Z06 2LZ, Cam, P/P/M Heads, FAST Intake/TB, ARH, CAI, HP Clutch/FW, C5 Axles, Pfadt Coilovers/Poly Bushings, Carbon Fiber: Everything, lol. HID's, 360 Forged Spec 5's/Invo's, Custom Interior. 550 RWHP http://www.camaro5.com/forums/showthread.php?t=235911 |
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12-22-2011, 09:13 AM | #25 |
Drives: '12 Camaro ZL1 #1255 Join Date: Feb 2007
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^FYI they didnt do the 24 hour test at the 'ring it was at there proving grounds.
Boost is at a fixed output (+/- 2psi pending airtemp), via the pully. more boost = more heat. thing with blown motors is heat soak so with more boost comes the need for more cooling mods ( heat exhacnger, meth....), especially on the road course where the car is full out for more than 12 seconds. It will be interesting to see, i think 95% of ZL1 owners wont have the car on the road course where its meant to be.
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12-22-2011, 09:21 AM | #26 |
Drives: CGM SS 6spd manual Join Date: Aug 2009
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yes.. my bad.
from what i've been told, the fisrt few development engines GM ran.. (bench tested) on 100% duty cycle. -first test , they were run to 6000 rpm for an hour straight.. -second test, from idle to WOT repeatedly for an hour -third tested , roll on throttle acceleration from 2200 rpm to wide open. the point being that they assume it very unlikely that an average joe will run the car at 6000 rpm for an hour.. that being thier worst case scenario. So the mind set was , build engines to worst case scenario and tune down for street reliability.. vs.. build to nornal street use and then tune them to the max limit. It seem GM has left lots of room for modification and still stay relatively safe and reliable. |
12-22-2011, 10:28 AM | #27 | |
Logic is dead
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Quote:
This is a staple for almost all cars that are FI based out of the box, for the most part. That is why we saw serious gains on the 03 Cobra with just a pulley and a tune. If you want to go apples-for-apples, the same thing with gaining 75-ish HP on the CTS-V with a pulley and tune. GM is also using (by my definition) a smaller blower on the LSA with the 1.9L. And given that the CR is in the 9.1 range, it allows enough boost to supplement the power without relying on it as the base of the platform.
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2010 Camaro 2SS/RS (LS3)
573 RWHP 498 RWTQ - Vortech V3 Supercharger - Kooks Stepped Headers, Magnaflow 16580 - Suspension by Pfadt, Hotchkis. 2007 Trailblazer SS- Sold 2001 Trans Am WS6 431 RWHP 408 RWTQ - Sold 1994 Camaro Z28 - Sold |
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12-22-2011, 10:37 AM | #28 | |
Drives: CGM SS 6spd manual Join Date: Aug 2009
Location: Surrey bc canada
Posts: 152
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Quote:
Its gonna be interesting to see how far these FI motors can be pushed.. |
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