turbo cams
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turbo cams Those of you with turbo cams- does it hurt driveability with higher duration on the exhaust side? Would lack of vacuum be an issue? I talked to comp cams about the cam specs that my engine builder installed in my engine, and the told me that the cam is the issue for the idle quality and lack of vacuum. any thoughts?
Engine specs: 390 ci, ported and polished 317 heads, edelbrock proflo xt, s480 with FI etr-ho billet wheel/ 1.32 exh hsg. Engine made 801 rwhp/ 684 rwtq @ 17.5 psi w/e85
dont have the cam specs in front of me, but i will post them up later
Engine specs: 390 ci, ported and polished 317 heads, edelbrock proflo xt, s480 with FI etr-ho billet wheel/ 1.32 exh hsg. Engine made 801 rwhp/ 684 rwtq @ 17.5 psi w/e85
dont have the cam specs in front of me, but i will post them up later
Last edited by dmaxvaz; Nov 1, 2013 at 10:23 AM.
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You would have to post can specs. LSA/overlap play a far bigger part in driveability than individual durations. If someone is claiming a turbo cam is hurting idle and vacuum, they are selling you the wrong cam.
For example, look at the Lingenfelter GT9 cam. 215/247 duration, .629/656 lift. Not a small can by any means at all, but produces a smooth idle and enough vacuum to be daily driven.
http://www.lingenfelter.com/mm5/merc...gory_Code=P016
For example, look at the Lingenfelter GT9 cam. 215/247 duration, .629/656 lift. Not a small can by any means at all, but produces a smooth idle and enough vacuum to be daily driven.
http://www.lingenfelter.com/mm5/merc...gory_Code=P016
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From: metro detroit, mi
You would have to post can specs. LSA/overlap play a far bigger part in driveability than individual durations. If someone is claiming a turbo cam is hurting idle and vacuum, they are selling you the wrong cam.
For example, look at the Lingenfelter GT9 cam. 215/247 duration, .629/656 lift. Not a small can by any means at all, but produces a smooth idle and enough vacuum to be daily driven.
http://www.lingenfelter.com/mm5/merc...gory_Code=P016
For example, look at the Lingenfelter GT9 cam. 215/247 duration, .629/656 lift. Not a small can by any means at all, but produces a smooth idle and enough vacuum to be daily driven.
http://www.lingenfelter.com/mm5/merc...gory_Code=P016
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It can as overlap goes up, driveability goes down.
Just got a turbo cam for a 416 TT setup, was pretty mild. 234/234 115+2. Goal is 1100rwhp. A bit small compared to my blower cam which is a 232/246 116+3.
That cam has 11 degrees of overlap which probably won't drive like stock but isn't that bad.
Just got a turbo cam for a 416 TT setup, was pretty mild. 234/234 115+2. Goal is 1100rwhp. A bit small compared to my blower cam which is a 232/246 116+3.
That cam has 11 degrees of overlap which probably won't drive like stock but isn't that bad.
How much power do you want it to make? I see no need to have the duration that high. 11* of overlap. Could easily make 1000+ on much less duration with that setup and retain stock like driveability/idle. I'd look at a 218/218 112 ISKY cam. Using that cam Stock48 is well over the 1000whp mark on a stock 6.0 long block.
Last edited by Forcefed86; Nov 1, 2013 at 01:32 PM.
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How much power do you want it to make? I see no need to have the duration that high. 11* of overlap. Could easily make 1000+ on much less duration with that setup and retain stock like driveability/idle. I'd look at a 218/218 112 ISKY cam. Using that cam Stock48 is well over the 1000whp mark on a stock 6.0 long block.
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Verdad Gallardo I'm making more power than that on a stock 5.3 shortblock with an OEM ZR1 cam with .56x lift. (which isn't the best either) Though it does idle/drive just like stock. No need for a "huge" cam to make that kind of power... esp with 390ci.
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The the longer stroke needs a little more cam than a std 6.0/370. I would keep it below 230 and lsa between 112-114. If it were me. Truck in sig has my triple 12 cam and makes 800 at the tire16psi on 91/meth with a cast 76. With race gas mix and more timing Was 936 sae locked at 20 psi and ran 9.73/@139.xx. Truck will sometimes bark all 4 tires off dead idle with no brake spool.
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The funny part about this, you're making 801rwhp through a 4L80 and complaining about idle quality.
If making 800rwhp is what you want, you have the right cam.
If you want stock idle and 700rwhp, get a smaller cam.
If making 800rwhp is what you want, you have the right cam.
If you want stock idle and 700rwhp, get a smaller cam.
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Another part though, that edelbrock intake manifold may not be great for low end torque, i'd consider trying an OE intake, just me.
In a light car the shift in power band from an intake runner change will not be noticeable, in a 5500lbs truck quite the contrary.
Last edited by Fraser588; Nov 4, 2013 at 12:55 AM.
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If you have stock like idle you will have 18-20" of vacuum, idle quality goes down so does the vacuum.
Another part though, that edelbrock intake manifold may not be great for low end torque, i'd consider trying an OE intake, just me.
In a light car the shift in power band from an intake runner change will not be noticeable, in a 5500lbs truck quite the contrary.
Another part though, that edelbrock intake manifold may not be great for low end torque, i'd consider trying an OE intake, just me.
In a light car the shift in power band from an intake runner change will not be noticeable, in a 5500lbs truck quite the contrary.
Last edited by dmaxvaz; Nov 4, 2013 at 06:42 AM.
Looks like you should go with the smaller cam. Stock48 made 900+rwhp with the 212/212 and the TBSS makes 900+rwhp with smaller cam also . I would PM stock48 and get him to spec you a cam, he's been doing 5.3/6.0 turbo truck builds for awhile and makes a ton of low end power on all his builds.