compression and boost ?
This is a discussion on compression and boost ? within the Forced Induction forums, part of the LSx Technical Help Section category; 10 PSI is ok with a dead on tune!, If i was you i wouldnt do it with a methanol ...
03-19-2010, 02:22 PM #21
10 PSI is ok with a dead on tune!,
If i was you i wouldnt do it with a methanol injection system, I know of a few cars running 12-13 PSI , But they are methanol injected
I ran 10-11 PSI on my "Stock" ls1 , headers & ported TB only , i made 566 @ the wheels
My IAT's were only 60 degs
I have a brand new alky control for anyone interested
03-19-2010, 02:45 PM #22
- Join Date
- Dec 2008
- Anderson, SC
- 2000 Z28
I think you forgot the 150 shot of juice
03-19-2010, 03:27 PM #23
03-21-2010, 08:02 AM #24
By the middle of this year I will have tuned 1,000 setups. Are you sure I am the guy that needs to study up on this?
FINALLY got this car dyno'd on thursday... 20k+ miles with a blower and lopey cam on this forged motor: http://www.ls1tech.com/forums/forced...-out-d1sc.html
I can easily find 20 more with blowers and large cams. I would make a public wager that you cannot even find half as many that have ANY TYPE OF blower or turbo failure from a loping cam. Idle gas flow hardly has enough velocity to even spin a turbo, you don't really think it has the velocity to cause some type of damaging surging do you? Back it up. Post up.
I can get FI owners with large cams and plenty of miles in here in numbers and like I said, I'd wager that you won't be able to find 50% as many that will tell of blower or turbo issues from a lope in idle.
Last edited by Frost; 03-21-2010 at 08:05 AM.
03-21-2010, 08:42 AM #25
03-21-2010, 09:02 AM #26
How is it arrogant to debate what as I see as being incorrect information rather than leaving it here for others to read and think it's solid? He didn't replace his stock cam for that one; his daily driver has been boosted with a lopey cam for years; you just made an assumption.
If you could cite examples to support your claim, you would have done that instead of being mad and calling me names. SHOW ME where a lopey cam has hurt a blower or turbo at idle as you said above. If it was "common knowledge" then the posts would be everywhere and I will tell you I'm wrong. That's the opposite of being arrogant.
03-21-2010, 09:22 AM #27
Idle/Driveability: A subjective rating of how lumpy or smooth the idle is and the quality of low rpm driveability. Luckily, with the AEM EMS I can make almost any cam idle well but some have to run at 1,200 rpm for stable idle while others run at 800 rpm. With a factory ECU the story is much different. Some more aggressive cams can cause very poor idle or even cause the engine to stall. Also, low speed running can be an issue with some cams and even cause bucking or misfires. I know we're modifying our cars in the interest of making them faster but most of us also use them as a daily driver. That makes this rating high on my list-it's not very fun driving in traffic while your engine keeps stalling out.
03-21-2010, 09:31 AM #28
The "common knowledge" as you put it was about lobe angle, durration, and seperation.. NOT about blowers/turbines going bad.. Again drive a lopey cammed FI in heavy traffic every day, day in and day out for possibly hours stuck in traffic. See how long it lasts as a DD. You tell me to base your info on what you've seen or not seen, heard or not heard.. I'd have to say then you've have'nt seen them all! Trust me you have not this is obvious.... Sorry if I hurt your feelings with the name calling, just how I see it as you come off..
Last edited by Smittro; 03-21-2010 at 09:40 AM.
03-21-2010, 09:57 AM #29
From your link..........
Forged Shortblock from EPP: Diamond pistons, Compstar Rods, ARP Main & Head Studs, Total Seal Rings
D-1SC Procharger, AFR 205's, EPP Front Mount Intercooler (31" x 12" x 4") (SD tune), 8-rib SDCE ( 7.25 crank, 3.4 Reichard Racing Blower Pulley) , Procharger Race Bypass, Alkycontrol, Siemens 60# injectors, Twin Walbro fuel pumps, 228/235 - 113 cam, LS6 Intake, Aeromotive FPR
Texas Speed 1 7/8" Long Tubes, Texas Speed ORY pipe w/ merge, Magnaflow Catback w/ Center Mount Exhaust
Textralia Z-grip Clutch, Textralia 18lb Billet Flywheel, T-56 with Steel 3-4 Shift Fork, Carbon Fiber Blocking Rings, Tick Adjustable Master Cylinder, Polyurethane Trans Mount, B&M Ripper Shifter
Moser 9in, 31 Spline Axles, 3.70 Gears, Truetrac, PST Driveshaft
I'm not seeing where it's a "stock internal" DD that gets stuck in traffic.. I just see numbers from dyno runs.....and praises from others and to you.... I also see that they have to get another piece of equiptment for 2 different tunes to even be streetable.. If it has such great drivability why would they need 2 tunes? Hmmm.. This thread has gone far enough astray and does'nt pertain to a stock internaled engine which is what the OP has...
Last edited by Smittro; 03-21-2010 at 10:12 AM.
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03-21-2010, 10:15 AM #30
I'm looking to up the boost on my 98 SS. I have a vortech G-trim supercharger, with a procharger inter-cooler. I was running 6lbs and I'm thinking about throwing on the 13lb pulley. This was the next jump up that vortech offered to me. I was looking for something around 10 pounds but Vortech only had 6 pounds and then 13 pound pulleys. I realize that I won't truly make 13 pounds of boost with the inter-cooler. However, I'm worried about the compression being to high. Do you guys think that I should look into lowering compression? If so what would be the best way to lower the compression? Does any company make larger head gaskets to lower compression(can't find anything)? Anyone else running a similar setup, I'd be interested in knowing how it's working out. Thank you.
03-21-2010, 10:33 AM #31
I have had a cam and 10+psi on my camaro for over two years with no problems. I also can daily drive mine if I want to (just have to be willing to put up with bypass noise)
I just upgraded heads that are milled to bump compression and put in a large cam and everything is fine and I can drive my car as much as I want whenever I want with no issues. I also am running 15+ psi and make almost 800 hp to the ground.
My compression is around 9.8 - 10.0 and I have a large cam
This thread is gay
Click on my sig pic if you want to see a real world boosted f-body build and get useful information
03-21-2010, 11:06 AM #32
- Join Date
- Feb 2010
- 2000 Camaro
I have driven w/ my setup (STOCK bottom end/AFR 205 62cc/G5X3/11.3ish' compression) w/ my F1c making 9.5 - 10 psi for well over a year. This combo is good for aroun 650 at the wheels.
My camaro drives just as well if not better than my 03 Civic. There have been plenty of times I needed to use the car for work (which includes 100+ miles of stop and go driving daily) and didn't think twice about it.
As far as I'm concerned, you can pull quotes from where ever you find them off the internet, but my own real life experience w/ a pretty big cam... and big blower tells a different story.
03-21-2010, 11:26 AM #33
03-21-2010, 12:31 PM #34
- Join Date
- Nov 2006
- Broken Arrow, OK
- 2000 Camaro SS
Any further name calling or insults will result in infractions from this point forward and the thread being closed.
03-21-2010, 12:40 PM #35
03-21-2010, 12:40 PM #36
03-21-2010, 12:43 PM #37
03-21-2010, 01:02 PM #38
Last edited by Smittro; 03-21-2010 at 01:04 PM.
03-21-2010, 01:05 PM #39
03-21-2010, 01:25 PM #40
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