Ok Turbo Cam Masters!!
Thread Starter
Joined: Nov 2001
Posts: 8,259
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From: Valrico, Florida
Ok Turbo Cam Masters!! Tell me how you decide on whether to use a single pattern, forward pattern or reverse pattern on a twin turbo car?? I dont want any cut and paste from some website. Dont quote me from Corky Bell's Maximum Boost book, because I have found avid followers of Corky Bell adjust their beliefs after more research. I want REAL World reasons for why you decide what you decide and I dont want to hear you do it because that's what you heard... This needs to be the last twin turbo cam thread... Now let's get some parameters together for current and future twin turbo guys.. No more FULL GUESS MODE!! Now "Let's get it on!" I watch too much UFC.. LOL!!
It's all going to depend on the specifics of the system. An Equal Length Manifold Designs are going to have different requirements than a shorty cast manifolds.
Intake/exhaust flow % and Exhaust Backpressure are going to play a huge role in Picking a Sigle/Dual/Reverse pattern Cam.
Intake/exhaust flow % and Exhaust Backpressure are going to play a huge role in Picking a Sigle/Dual/Reverse pattern Cam.
I have a few pieces of reasoning for my turbo cam selection (T76gts):
1. I had a 228/232 on a 114 at first. Made GREAT power up top but didn't spool my 76gts until ~3700ish rpms with stock cubes.
2. One of my best friends (Mr_president) had a VERY similar set-up, but with a small reverse split cam 218/214 on a 115. His car spooled instantly if you even THOUGHT about touching the gas, and went 10.20s on only 9psi.
3. When I switched to a 364ci and TH400, I bought a custom grind cam from Stenod/camotion: 240/236 114 It was big, loped, made good power, still spooled a tad late IMO (at ~3800rpms with my 3200stall). I loved that cam and sold it to another member......kinda regret it.
4. I switched from some race prted patriots to some AFR225s and threw in an AFR custom grind: 230/228 115. No lope really, sounds cammed though. No dyno numbers, but went low 10s on the shittiest passes/conditions ever. Spools around 3700.
Did that even help? lol.
1. I had a 228/232 on a 114 at first. Made GREAT power up top but didn't spool my 76gts until ~3700ish rpms with stock cubes.
2. One of my best friends (Mr_president) had a VERY similar set-up, but with a small reverse split cam 218/214 on a 115. His car spooled instantly if you even THOUGHT about touching the gas, and went 10.20s on only 9psi.
3. When I switched to a 364ci and TH400, I bought a custom grind cam from Stenod/camotion: 240/236 114 It was big, loped, made good power, still spooled a tad late IMO (at ~3800rpms with my 3200stall). I loved that cam and sold it to another member......kinda regret it.
4. I switched from some race prted patriots to some AFR225s and threw in an AFR custom grind: 230/228 115. No lope really, sounds cammed though. No dyno numbers, but went low 10s on the shittiest passes/conditions ever. Spools around 3700.
Did that even help? lol.
Launching!
Joined: Apr 2007
Posts: 279
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From: lynchburg va
Originally Posted by Alex @ CMS
It's all going to depend on the specifics of the system. An Equal Length Manifold Designs are going to have different requirements than a shorty cast manifolds.
Intake/exhaust flow % and Exhaust Backpressure are going to play a huge role in Picking a Sigle/Dual/Reverse pattern Cam.
Intake/exhaust flow % and Exhaust Backpressure are going to play a huge role in Picking a Sigle/Dual/Reverse pattern Cam.
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Joined: Jul 2005
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I don't think anyone out there has done enough dyno testing to say whether or not conventional split, single pattern, or revers split works best on a turbo. Er, actually, at what backpressure - boost pressure differential is each more effective.
I personally believe you can't go wrong with a conventional split pattern cam. See my 224/236 cam, running at 34 psi backpressure and 17 psi boost just fine. I tried a 226/226 one time and was unhappy with the results, so I put the "blower cam" back in.
INTMD8 did more turbo cam testing than anyone else I've heard of. He tried a 214/222, 227/218, 224/224, and a 218/218 (these spec's are from memory, so if I'm off a few degrees, forgive me). I do know for sure that his 224/224-113 made the most power. He wasn't at all happy with the 227/218.
Mike
I personally believe you can't go wrong with a conventional split pattern cam. See my 224/236 cam, running at 34 psi backpressure and 17 psi boost just fine. I tried a 226/226 one time and was unhappy with the results, so I put the "blower cam" back in.
INTMD8 did more turbo cam testing than anyone else I've heard of. He tried a 214/222, 227/218, 224/224, and a 218/218 (these spec's are from memory, so if I'm off a few degrees, forgive me). I do know for sure that his 224/224-113 made the most power. He wasn't at all happy with the 227/218.
Mike
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How about you list all the details about the car that the cam is going in and make it a competition between shops. Have everyone grind there own version based on the specs and then go spend a couple days on the dyno with a 2 peice cam cover. 
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Verdad Gallardo Thread Starter
Joined: Nov 2001
Posts: 8,259
Likes: 4
From: Valrico, Florida
Originally Posted by black98ws6ta
How about you list all the details about the car that the cam is going in and make it a competition between shops. Have everyone grind there own version based on the specs and then go spend a couple days on the dyno with a 2 peice cam cover.
Originally Posted by black98ws6ta
How about you list all the details about the car that the cam is going in and make it a competition between shops. Have everyone grind there own version based on the specs and then go spend a couple days on the dyno with a 2 peice cam cover.
I have a 228/230 571/573 on a 112 in a 6.0l Silverado SS truck. A fairly unconventional turbo cam as most would say. Tubular 1 5/8" headers, 2.5" crossover and a 3" downpipe. I think its going to hit the TC76 with a .96 a/r really hard. We will see next week.
Thread Starter
Joined: Nov 2001
Posts: 8,259
Likes: 4
From: Valrico, Florida
Originally Posted by hellbents10
I have a 228/230 571/573 on a 112 in a 6.0l Silverado SS truck. A fairly unconventional turbo cam as most would say. Tubular 1 5/8" headers, 2.5" crossover and a 3" downpipe. I think its going to hit the TC76 with a .96 a/r really hard. We will see next week.
good thread ... but you'll see so many different combos and great results from the different combos. From what I have seen on here and other sites... anything from 215-230 duration cams will typically make about the same peak power... just vary in low/mid range. Trying to nail down the rpm range and the low/mid range is what varying the cam specs will do.
Thread Starter
Joined: Nov 2001
Posts: 8,259
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From: Valrico, Florida
Originally Posted by VH5150
as if 800rwhp on "low boost" wasent enough for you vince.... u just dont give up.... 
Thread Starter
Joined: Nov 2001
Posts: 8,259
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From: Valrico, Florida
Originally Posted by INTMD8
That sir, is VERY unlikely
