Camshaft Discussion part II
Originally Posted by Plan B
My 422 n/a ran a solid 258/262 on 108lsa .650” lift 680 fwhp at 6,800rpm. It drove nice with 8tb’s a little ugly with the stock LS6 intake though, still drivable. I’ve since pulled the engine and I’m in the middle of putting a 4 link rear end in. It was a little too strong for the street on our size tyres.
Glad you’re enjoying it over here J-Rod.
Glad you’re enjoying it over here J-Rod.
J-Rod...one last Congrats.
Do you feel the small seperations also hold true in regards to turbo set ups? I have a hard time thinking say a 110 is going to give me what say ,a 115 might give me...but I do like to go against the grain.
Do you feel the small seperations also hold true in regards to turbo set ups? I have a hard time thinking say a 110 is going to give me what say ,a 115 might give me...but I do like to go against the grain.
TECH Junkie
Joined: Dec 2001
Posts: 3,242
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From: Lakeland, FL
I hope I'm not coming into this too late but whats the difference between speed density and Mass Air Flow? MAF I understand but what is the speed density tune and why when using it can you ditch the MAF?
Launching!
Joined: May 2003
Posts: 200
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Ye of little faith.
We have just tuned on engine dyno a small single pattern cam in speed density for an Auto daily driver 244\244 .620 110lsa. It will be on the chassis dyno thursday for some idle setup behind the drive train.
When i originally got ls1 edit august 2002 we found that there was no benefit to be had with a descreened ported Maf , we tuned the car with a stock Maf which resulted in allround better package. The car travelled 60,000k on this setup.
With the new motor it was decided to go with speed density rather than keep the Maf as we were aiming to max airflow for 429 ci motor, as it was the LS6 Manifold pulled us up short just over 5200 rpm with the MAP going down to 94. We nearly had an opportunity to do a back to back on a LSX with 90 mm TB unfortunately could get it overnight.
My setup isnt solid roller but comp r with yella terras and comp 921 and the yella terras take a bit of work to get right on compRs.
All this post is about is to give you what we went through to get the setup, as a matter of interest our first tune with edit 18 months ago was on my head and cam auto with a comp 216\220 to get it right it took many hours on chasis dyno.
Now the same person does speed density tunes within a couple of hours hence why he has stacks of MAFS on the shelf
We have just tuned on engine dyno a small single pattern cam in speed density for an Auto daily driver 244\244 .620 110lsa. It will be on the chassis dyno thursday for some idle setup behind the drive train.
When i originally got ls1 edit august 2002 we found that there was no benefit to be had with a descreened ported Maf , we tuned the car with a stock Maf which resulted in allround better package. The car travelled 60,000k on this setup.
With the new motor it was decided to go with speed density rather than keep the Maf as we were aiming to max airflow for 429 ci motor, as it was the LS6 Manifold pulled us up short just over 5200 rpm with the MAP going down to 94. We nearly had an opportunity to do a back to back on a LSX with 90 mm TB unfortunately could get it overnight.
My setup isnt solid roller but comp r with yella terras and comp 921 and the yella terras take a bit of work to get right on compRs.
All this post is about is to give you what we went through to get the setup, as a matter of interest our first tune with edit 18 months ago was on my head and cam auto with a comp 216\220 to get it right it took many hours on chasis dyno.
Now the same person does speed density tunes within a couple of hours hence why he has stacks of MAFS on the shelf
Staging Lane
Joined: Jan 2002
Posts: 75
Likes: 0
Originally Posted by binksz06
So, is everyone agreeing that the LS1/6 is a "Smallblock Chevy"- i.e. same cam rules apply?
J-Rod - How do they adjust for the low map at low rpm idle - as far as the automatic tranny requirements? I know very little about automatics but I realize they require vacuum.
I wouldn't follow the Aussies belief in MAFLESS tunes for the Street.
joel
J-Rod - How do they adjust for the low map at low rpm idle - as far as the automatic tranny requirements? I know very little about automatics but I realize they require vacuum.
I wouldn't follow the Aussies belief in MAFLESS tunes for the Street.
joel
TECH Enthusiast
Joined: Nov 2001
Posts: 534
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From: Sydney Australia
Originally Posted by VINCE
Pics of that setup would be nice. What were your idle rpms? I also think your solid roller cam is really not that big for your size motor. Solid Roller cars idle much better than Hydr Cams of the same size. I for one drive my car great distances. I would be a little scared to have to stop every now and then to check my valve lash. Plus, my springs would get beat to hell in less than a year.
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TECH Addict
Joined: Jul 2002
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TECH Addict
Joined: Jul 2002
Posts: 2,261
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Originally Posted by VT2 EXEC LS1
I'll be the first to let you know how my car goes when it's running Joel. I'll be running the GM GrandAm cup cam kit in an A4. Engine comes back from the machine shop this week so it should be running in 2 - 3 weeks.
joel
Thread Starter
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
Likes: 13
From: Texas
Plan B's ride is pretty trick. He has a nice daily driver ute to replace the one that went under the knife. The old PlanB is now a back halfed car and should have one of those pretty 8TB setups with 1000HP on tap soon.
TECH Addict
Joined: Jul 2002
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Originally Posted by VINCE
I want to see pics of your car and engine compartment..
PlanB - Are the Pics I Posted of your current setup - i.e. Sam's TBs ?
Originally Posted by binksz06
VINCE - I posted a couple of his car a few posts above. I copied them last month off the LS1.Au forum because they looked sweet.
PlanB - Are the Pics I Posted of your current setup - i.e. Sam's TBs ?
PlanB - Are the Pics I Posted of your current setup - i.e. Sam's TBs ?
Thread Starter
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
Likes: 13
From: Texas
Originally Posted by VINCE
I saw them after I posted. That engine shot looks sweet.. I wonder how we could have a intake like that..?
Originally Posted by J-Rod
All it takes is money. Actually, I think a production version is scheduled to be out soon for around $3000 US.
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
Great thread guys!!
I have a question. Is there a calculator out there to take various events and have different grinds to match those events.
Take for example the 242/248 110LSA +2 TREX.
Would it be possible to extrapolate these valve timing events to a cam with less duration but wider LSA/less intake/exhaust duration/different advance/retard to improve drivability but give the same event characteristics.
I have a question. Is there a calculator out there to take various events and have different grinds to match those events.
Take for example the 242/248 110LSA +2 TREX.
Would it be possible to extrapolate these valve timing events to a cam with less duration but wider LSA/less intake/exhaust duration/different advance/retard to improve drivability but give the same event characteristics.
Originally Posted by Chris ARE 360
Great thread guys!!
I have a question. Is there a calculator out there to take various events and have different grinds to match those events.
Take for example the 242/248 110LSA +2 TREX.
Would it be possible to extrapolate these valve timing events to a cam with less duration but wider LSA/less intake/exhaust duration/different advance/retard to improve drivability but give the same event characteristics.
I have a question. Is there a calculator out there to take various events and have different grinds to match those events.
Take for example the 242/248 110LSA +2 TREX.
Would it be possible to extrapolate these valve timing events to a cam with less duration but wider LSA/less intake/exhaust duration/different advance/retard to improve drivability but give the same event characteristics.
Thread Starter
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
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From: Texas
The problem is knowing lift @ .006, .050, .200, etc... You need to know more than .050. But in terms of the Valve events, you can use my VE calculator, and that will get you in the ball park. I have it set up to calc .006, .050, and .200
TECH Addict
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Originally Posted by J-Rod
The problem is knowing lift @ .006, .050, .200, etc... You need to know more than .050. But in terms of the Valve events, you can use my VE calculator, and that will get you in the ball park. I have it set up to calc .006, .050, and .200
J-Rod - Where is the link to your VE Calculator? I thought it was in this thread but I can't find it . Thanks.
joel