Need help choosing new turbo cam
Thread Starter
Joined: Jun 2002
Posts: 2,062
Likes: 1
From: L-Town N.Y.
Need help choosing new turbo cam Hey guys I am currently am running a comp
224/224 .581/.581 116 LSA
The car makes good power right now but it peaks around 6000-6100 then drops off hard . I like the smaller cams with a smooth idle . I was just wondering if anyone has any Ideas on another cam that might pick up all around and alow me to peak around 6500-6600
My current motor setup is
aes 390 shorblock
As Cast Trick flow 220 heads
ls6 intake ( I have a fast 102 Im installing this week)
c5r timing chain
APS extreme twin turbo kit
4l80 trans
9 inch rear 325 gears
I was thinking of a 230/230 115 lsa cam but I am worried about idle quality
224/224 .581/.581 116 LSA
The car makes good power right now but it peaks around 6000-6100 then drops off hard . I like the smaller cams with a smooth idle . I was just wondering if anyone has any Ideas on another cam that might pick up all around and alow me to peak around 6500-6600
My current motor setup is
aes 390 shorblock
As Cast Trick flow 220 heads
ls6 intake ( I have a fast 102 Im installing this week)
c5r timing chain
APS extreme twin turbo kit
4l80 trans
9 inch rear 325 gears
I was thinking of a 230/230 115 lsa cam but I am worried about idle quality
9 Second Truck Club
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From: Colorado Springs, Co/ Central, Ca
X2. or maybe ignition or vale float. My little 6.0L, 212/112lsa pulls well past 6500 with either the GT76/94 or PT88/94 but lays over at 5500 with the Tc76/68.
Thread Starter
Joined: Jun 2002
Posts: 2,062
Likes: 1
From: L-Town N.Y.
Im not exactly sure what size they are. I have the APS extreme kit though and many others on this board run it with 427 engines making up to 1000k. I believe they flow 65# per each. Here is my current dyno sheet. Can you tell from the sheet what is going on. These numbers are through my 4l80 unlocked
That looks like valve float for sure. I didn't look at your lobe profiles but I bet those are xer lobes? Xer lobes + heavy trick flow valves and probably aftermarket roller rockers will do this. There was a guy on here with a vette who had this same issue I will find you his thread. A lot of n/a guys have issues with your same combo. You have several options.
TECH Fanatic
Joined: Nov 2001
Posts: 1,027
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From: KS
Curious as to what boost that's at?
I had a custom cam ground for my twin kit as well. One thing the guy said who came up with the profile was "you don't want the cam getting in the way of the turbos." We were speaking about rpm limits. He talked like the cam did not necessarily dictate RPM limits as they do on a N/A engine.
I had a custom cam ground for my twin kit as well. One thing the guy said who came up with the profile was "you don't want the cam getting in the way of the turbos." We were speaking about rpm limits. He talked like the cam did not necessarily dictate RPM limits as they do on a N/A engine.
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Found the thread, check it out as he went through alot to solve his issues https://ls1tech.com/forums/forced-in...20-pounds.html
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Brett Foote 9 Second Truck Club
iTrader: (17)
Joined: Sep 2006
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From: Colorado Springs, Co/ Central, Ca
Curious as to what boost that's at?
I had a custom cam ground for my twin kit as well. One thing the guy said who came up with the profile was "you don't want the cam getting in the way of the turbos." We were speaking about rpm limits. He talked like the cam did not necessarily dictate RPM limits as they do on a N/A engine.
I had a custom cam ground for my twin kit as well. One thing the guy said who came up with the profile was "you don't want the cam getting in the way of the turbos." We were speaking about rpm limits. He talked like the cam did not necessarily dictate RPM limits as they do on a N/A engine.
Thread Starter
Joined: Jun 2002
Posts: 2,062
Likes: 1
From: L-Town N.Y.
That was with 18 psi and 15 deg of timing. I made 751 rwhp on 15 psi and 20 deg timing. But When i tried to add the timing back in with 18 psi the tires would spin. The tires were wide but very short. I just put some 325/50/15`s which are 28 inches tall. That should help a bit.
It does not matter what boost I have in it it peaks at the same rpm
It does not matter what boost I have in it it peaks at the same rpm
Thread Starter
Joined: Jun 2002
Posts: 2,062
Likes: 1
From: L-Town N.Y.
That looks like valve float for sure. I didn't look at your lobe profiles but I bet those are xer lobes? Xer lobes + heavy trick flow valves and probably aftermarket roller rockers will do this. There was a guy on here with a vette who had this same issue I will find you his thread. A lot of n/a guys have issues with your same combo. You have several options.
BTW This car is a friggen beast so its not like Im not enjoying it but I have a feeling I can be doing alittle better than I am right now. OFcourse the unlocked 4l80 and the 9 in and steel driveshaft arent going to help the dyno numbers but I am more interested in the track times and not breaking.
All help and suggestions are very appreciated
Last edited by offaxis; Apr 7, 2012 at 04:42 PM.
TECH Fanatic
Joined: Nov 2001
Posts: 1,027
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From: KS
Your Dyno numbers look great! That trans and diff are hp eaters.
Normally I am a CompCam guy all the way. When I was researching the "what cam" question the information I found was many of the guys who were throwing down numbers that I liked(big) and were doing it with small twin setups (61's and 62's) were running Bullet cams. This info was acquired from several sources. There is a guy there who is particularly good at specing cams for turbo cars. Especially when you have all the right info like head flow numbers and so on. A custom cam is no more than a shelf cam.
And your rockers are as big a problem as the XER lobes.
Normally I am a CompCam guy all the way. When I was researching the "what cam" question the information I found was many of the guys who were throwing down numbers that I liked(big) and were doing it with small twin setups (61's and 62's) were running Bullet cams. This info was acquired from several sources. There is a guy there who is particularly good at specing cams for turbo cars. Especially when you have all the right info like head flow numbers and so on. A custom cam is no more than a shelf cam.
And your rockers are as big a problem as the XER lobes.
Thread Starter
Joined: Jun 2002
Posts: 2,062
Likes: 1
From: L-Town N.Y.
I broke down and ordered the 230/230 115 lsa on the xe lobes. I got the specs from PREDATOR-Z so I knew i was ordering the right cam ve been Sd tuned for a while but I still have the stock maf in there with the screen stil in it. That will be removed now. Im not sure what kind of gains I will get but I will be posting the results. Hopefully if there was any valve float from the xer lobes the xe will fix it.
