big blower cams, do I need one ?
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From: Norn Iron
big blower cams, do I need one ? I'm upgrading to 382 over the winter, and will be swapping my cam too. new 382 will basically be same as 346, FFHP stg 1 heads, 1 3/4" LT's, 8.7:1 CR pump fuel, with a 50/50 WI/meth Aquamist kit, Vortech YSi etc etc.
Prob change to a SNOW Alky kit over the winter too.
I want a smooth idle, but appreciate I may not be able to have that.
I need to make good power from 4500-6500rpm which is where I mostly see when Im racing, even if that doesnt happen as often as I'd like.
Cam needs to take me to about 6800rpm in 4th, for 140+ trap speeds, which is where I'd like to be. Quarter ET's are never going to be astonishing, for various reasons. I'm quite happy to aim for high speeds instead.
With my current setup, I'm shifting at about 6000rpm, which feels ok. Havent tried shifting any higher, although it will rev to 6500rpm ok.
Current cam on 346 is 230/236 112LSA+4 0.596"/0.606", which is about as lopey as I'd ever want ( its too much for me actually ), and managed a best so far of 11.177 @ 130.33, although have trapped 134.
For the 382, Ive been recommended this so far by Cam-Motion.
236/243 0.600"/0.618" 114LSA 110ICL ?
Any thoughts ?
It sounds like a hell of a lot of cam, but I'm sure their advice is sound. It is first and foremost a road car, so I'd really like to avoid such big cams if possible.
Can I meet my goals with a milder cam ?
Thanks, Stevie
Prob change to a SNOW Alky kit over the winter too.
I want a smooth idle, but appreciate I may not be able to have that.
I need to make good power from 4500-6500rpm which is where I mostly see when Im racing, even if that doesnt happen as often as I'd like.
Cam needs to take me to about 6800rpm in 4th, for 140+ trap speeds, which is where I'd like to be. Quarter ET's are never going to be astonishing, for various reasons. I'm quite happy to aim for high speeds instead.
With my current setup, I'm shifting at about 6000rpm, which feels ok. Havent tried shifting any higher, although it will rev to 6500rpm ok.
Current cam on 346 is 230/236 112LSA+4 0.596"/0.606", which is about as lopey as I'd ever want ( its too much for me actually ), and managed a best so far of 11.177 @ 130.33, although have trapped 134.
For the 382, Ive been recommended this so far by Cam-Motion.
236/243 0.600"/0.618" 114LSA 110ICL ?
Any thoughts ?
It sounds like a hell of a lot of cam, but I'm sure their advice is sound. It is first and foremost a road car, so I'd really like to avoid such big cams if possible.
Can I meet my goals with a milder cam ?
Thanks, Stevie
Just keep what you have now and it should pull just like u want it to.... plus it will idle better because the bigger cubes will help....... thats just my .02 though...
Kyle
Kyle
Well, I'm sure Kyle has some prior experience that would explain his position but here's mine:
2004: 10.3@136, with 230/236//115 cam, and belt slippage
2005: 9.4@143mph, with 236/246//114 cam, maybe a little slippage Even when I have lost a belt or had slippage I still ran in the 9's and never slower than 137mph. I have five 143-144mph passes.
Cam is like .595/.630.
2004: 10.3@136, with 230/236//115 cam, and belt slippage
2005: 9.4@143mph, with 236/246//114 cam, maybe a little slippage Even when I have lost a belt or had slippage I still ran in the 9's and never slower than 137mph. I have five 143-144mph passes.
Cam is like .595/.630.
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From: Norn Iron
And is that with same sort of boost/pulley combo John with both camshafts ?
As for re-using my existing cam....that was pretty much my intention, until I downloaded DynoSim 2003 and input as much of my data as I could lol
While the cam worked ok in my 346. It did suggest retarding timing by 4deg would pick up almost 50bhp. Ironic as it as 4deg ground in, although its by no means a blower grind.
It also suggested if I change the engine size 382, all other things being equal, I'd make less power than my 346.....
Havent input any other data to try.
Terry did say the 236/243 would idle similar to my old, as it only has 2 deg more overlap. But as I say, I'd rather have a smoother idle than what I currently have.
As for re-using my existing cam....that was pretty much my intention, until I downloaded DynoSim 2003 and input as much of my data as I could lol
While the cam worked ok in my 346. It did suggest retarding timing by 4deg would pick up almost 50bhp. Ironic as it as 4deg ground in, although its by no means a blower grind.
It also suggested if I change the engine size 382, all other things being equal, I'd make less power than my 346.....
Havent input any other data to try.
Terry did say the 236/243 would idle similar to my old, as it only has 2 deg more overlap. But as I say, I'd rather have a smoother idle than what I currently have.
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Same pulleys, I have made more power/boost in 2005 but not consistently. Some folks say I am over-cammed but until I see other folks running 144mph with a blower I will assume I made the right choice.
Now I feel like running it one more time.
Now I feel like running it one more time.
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Verdad Gallardo Well, if you kept the same camshaft, it wouldn't rev quite as high in a 382. Assuming you're keeping the pulley sizes the same with both combos, you wouldn't be spinning the blower quite as fast since you're losing a few hundred rpms with the bigger engine.
Originally Posted by Pro Stock John
Well, I'm sure Kyle has some prior experience that would explain his position but here's mine:
2004: 10.3@136, with 230/236//115 cam, and belt slippage
2005: 9.4@143mph, with 236/246//114 cam, maybe a little slippage Even when I have lost a belt or had slippage I still ran in the 9's and never slower than 137mph. I have five 143-144mph passes.
Cam is like .595/.630.
2004: 10.3@136, with 230/236//115 cam, and belt slippage
2005: 9.4@143mph, with 236/246//114 cam, maybe a little slippage Even when I have lost a belt or had slippage I still ran in the 9's and never slower than 137mph. I have five 143-144mph passes.
Cam is like .595/.630.
what was the 60' and weather and boost like on both those passes John????
Id like to see them side by side so we can compare them......
Im not saying your wrong id just like to see them so we cna see how much the cam really gave you ya know.
One more time huh......... so did the blower kit sell yet???
Turbo Time??????????
Kyle
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From: Norn Iron
I'm currently pullied at 8.25/3.15, although I intend dropping that to a 3.0" for the 382, to see how that goes. I can get ASP to make me smaller ones if necessary, although I think the blower will already be spinning pretty hard with the 3.0, although there is some rpm's left.
8.25/3 x 3.45 x 6500rpm = 61668rpm
8.25/3 x 3.45 x 6500rpm = 61668rpm
10.3@136 - August 2004
9.6@144 - July 2005
9.4@143 - Sept 2005
I picked up over 70rwhp under the curve from the cam swap, meaning the hp curve was close to flat as it's ever been.
Until I see another blower car run the same 1/8th (5.999, 116) and 1/4 (9.4, 143), I'll just assume that this cam is a good cam for a blower.
My combo has been peaking at 6500-6600 on the dyno.
I'm not going turbo until I get a good offer for my kit or my stuff parted out. If I pull out 100 lbs and just play with the tune this blower kit will go 8.99.
9.6@144 - July 2005
9.4@143 - Sept 2005
I picked up over 70rwhp under the curve from the cam swap, meaning the hp curve was close to flat as it's ever been.
Until I see another blower car run the same 1/8th (5.999, 116) and 1/4 (9.4, 143), I'll just assume that this cam is a good cam for a blower.
My combo has been peaking at 6500-6600 on the dyno.
I'm not going turbo until I get a good offer for my kit or my stuff parted out. If I pull out 100 lbs and just play with the tune this blower kit will go 8.99.
If nobody makes a good offer on my blower stuff I'm going to do 100 lbs of weight reduction in the next two weeks.
Back to the thread...
How heavy is the car? 140mph traps is something you might be able to do now.
Back to the thread...
How heavy is the car? 140mph traps is something you might be able to do now.
Thread Starter
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From: Norn Iron
I actually weighed it the other night. Its actually a little lighter than I thought, at 3600lbs.
My highest trap so far was 134.22 on an 11.35s run. Actually picked up 33.42 mph in the last 1/8th, which was my highest speed increment of the day, from 7.566 @ 100.8 to 134.22 @ 11.35
Best run was 11.17 @ 130.33
So traps are consistent 130-134mph. 4 of the 15 runs were 133+ Although I was still shifting about 6000rpm.
Must try revving it higher to see what happens next time I get a chance..
My highest trap so far was 134.22 on an 11.35s run. Actually picked up 33.42 mph in the last 1/8th, which was my highest speed increment of the day, from 7.566 @ 100.8 to 134.22 @ 11.35
Best run was 11.17 @ 130.33
So traps are consistent 130-134mph. 4 of the 15 runs were 133+ Although I was still shifting about 6000rpm.
Must try revving it higher to see what happens next time I get a chance..
Thread Starter
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From: Norn Iron
It just felt right to shift then?
From datalogs, generally 1st gear would hit about 6300-6500rpm. 2nd 6100rpm, 3rd 6100rpm at most, crossing the line between 6000-6300rpm, depending on run.
Although on that day, I was having an occasional missfire around 6000 in 4th. Although Ive always shifted around 6000rpm. Any missfire didnt effect my shift patterns.
If I can get a dry day, and my belt holds together, I'll try and get a few runs on the road with my GPS Accelerometer and compare shifting at say 6000rpm and 6500rpm.
As for cam, starting to think about Futrals FM7 224"/230" .588"/.595" 114LSA, except maybe on 115 ??
Im also inspired by this combo from Andy with a T trim and 220/224 cam on a 346..
http://forums.corvetteforum.com/show...&highlight=cam
Relatively mild does seem to be able to make power.
From datalogs, generally 1st gear would hit about 6300-6500rpm. 2nd 6100rpm, 3rd 6100rpm at most, crossing the line between 6000-6300rpm, depending on run.
Although on that day, I was having an occasional missfire around 6000 in 4th. Although Ive always shifted around 6000rpm. Any missfire didnt effect my shift patterns.
If I can get a dry day, and my belt holds together, I'll try and get a few runs on the road with my GPS Accelerometer and compare shifting at say 6000rpm and 6500rpm.
As for cam, starting to think about Futrals FM7 224"/230" .588"/.595" 114LSA, except maybe on 115 ??
Im also inspired by this combo from Andy with a T trim and 220/224 cam on a 346..
http://forums.corvetteforum.com/show...&highlight=cam
Relatively mild does seem to be able to make power.
