installing 215's on my car tommorrow, wanna keep track of this thread 
Disappointing results with TFS Heads
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Joined: Jul 2003
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From: Ankeny, IA
Disappointing results with TFS Heads Long story short I dyno'd last fall with a Futral F13 cam (230/232 .595/.585 112LSA no advance) and Absolute Speed stage 2 241 heads (306cfm intake/230cfm exhaust @.600) and made about 420rwhp and 380rwtq. A small gain from the previous cam, a TR 227/224 (.569/.563), which netted 416rwhp. So I decided that the heads were holding me back.
So this spring I installed a set of Trickflow 215's milled to 61cc. Here is the result:
Yup 5rwhp/2rwtq which was disappointing to say the least.
So I'm not sure where to go next. The car has had it's last 2 tuning sessions with Dan at FLP, so the tune is not suspect (it runs hard and drives great). I asked him if it looks like there was any valvetrain instability and there doesn't appear to be. I triple checked my pushrod measurements when installing (ended up with a 7.5" pushrod since my TFS heads are milled to 61cc).
My gut tells me I am looking at a restriction someplace. The cam and heads should have each yielded at least a modest gain, but instead I'm only seeing minute changes. The exhaust with Corsa Indy's and catless Longtubes doesn't seem likely. The cam isn't huge, but judging from others results and the specs I would think it should support some decent power. My only thought at this point is that the stock MAF/airbridge/TB and the LS6 intake are starving the engine of air. But before I contemplate sinking more money into this thing I'd really like some opinions on what could be holding this combo back.
So this spring I installed a set of Trickflow 215's milled to 61cc. Here is the result:
Yup 5rwhp/2rwtq which was disappointing to say the least.
So I'm not sure where to go next. The car has had it's last 2 tuning sessions with Dan at FLP, so the tune is not suspect (it runs hard and drives great). I asked him if it looks like there was any valvetrain instability and there doesn't appear to be. I triple checked my pushrod measurements when installing (ended up with a 7.5" pushrod since my TFS heads are milled to 61cc).
My gut tells me I am looking at a restriction someplace. The cam and heads should have each yielded at least a modest gain, but instead I'm only seeing minute changes. The exhaust with Corsa Indy's and catless Longtubes doesn't seem likely. The cam isn't huge, but judging from others results and the specs I would think it should support some decent power. My only thought at this point is that the stock MAF/airbridge/TB and the LS6 intake are starving the engine of air. But before I contemplate sinking more money into this thing I'd really like some opinions on what could be holding this combo back.
Thread Starter
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Joined: Jul 2003
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From: Ankeny, IA
Originally Posted by Sharpe
Well, what did Dan say?
On The Tree
Joined: Nov 2005
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A ported FAST will get you about 15-20rwhp. A Callaway Honker will also get you some more horsepower. I read one article in a 'Vette magazine where an H/C FRC gained around 10whp with one over a Blackwing. A Vararam will do well too.
Originally Posted by 99C5JA
Absolute Speed stage 2 241 heads (306cfm intake/230cfm exhaust @.600) and made about 420rwhp and 380rwtq.
So this spring I installed a set of Trickflow 215's milled to 61cc.
Yup 5rwhp/2rwtq which was disappointing to say the least.
So this spring I installed a set of Trickflow 215's milled to 61cc.
Yup 5rwhp/2rwtq which was disappointing to say the least.
Something must be wrong there, don't you think?
Christian
Last edited by miami993c297; Jun 14, 2007 at 07:34 AM.
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I have seen 2 poor results with TFS heads, yours and a guy with a C6 Vette LS2 and TFS 225 heads, the only thing in common is both combinations had YT roller rockers...
I would take the advice of Mike above...
I would take the advice of Mike above...
Originally Posted by Brian Tooley
I have seen 2 poor results with TFS heads, yours and a guy with a C6 Vette LS2 and TFS 225 heads, the only thing in common is both combinations had YT roller rockers...
I would take the advice of Mike above...
I would take the advice of Mike above...
I am running the TFS 225 Heads on a 347 Motor with a 648 - 652 Duration Cam on a 110 Lobe Sep at 650 lift, Nick William TB, FAST Intake (ported), Kooks 1 7/8 headers Stepped 2inch on 3 1/2 Collectors with a 3 1/2 inch Custom X-Pipe with Elec Waterpump & pulley through a Stage 3 Built 4L60E Trans with a Yank PT 4400 converter,on a 12 Bolt.
Any thoughts on what I can do to help out this combo. I am looking to make 440 RWHP
Sorry to the thread starter. I didn't mean to Hi Jack your thread
Seb
Originally Posted by NEVRLIFT
A ported FAST will get you about 15-20rwhp. A Callaway Honker will also get you some more horsepower. I read one article in a 'Vette magazine where an H/C FRC gained around 10whp with one over a Blackwing. A Vararam will do well too.
It would have picked that up with his old heads also.
Originally Posted by SEBLS1
I am running the TFS 225 Heads on a 347 Motor with a 648 - 652 Duration Cam on a 110 Lobe Sep at 650 lift, Nick William TB, FAST Intake (ported), Kooks 1 7/8 headers Stepped 2inch on 3 1/2 Collectors with a 3 1/2 inch Custom X-Pipe with Elec Waterpump & pulley through a Stage 3 Built 4L60E Trans with a Yank PT 4400 converter,on a 12 Bolt.
Any thoughts on what I can do to help out this combo. I am looking to make 440 RWHP
Sorry to the thread starter. I didn't mean to Hi Jack your thread
Seb
Any thoughts on what I can do to help out this combo. I am looking to make 440 RWHP
Sorry to the thread starter. I didn't mean to Hi Jack your thread
Seb
Thats a big *** cam for a 347.
I dont think it needs to be that big to make 440rwhp.
Isn't the "stock" pushrod length 7.700" for use with the TFS heads? If so, why would you go to a 7.500" which is .200" shorter? Even if you mill the heads .18" ~ 61cc, you'd still need 7.675" pushrods. Do the YTs require a different length pushrod?
Originally Posted by SEBLS1
I am running the TFS 225 Heads on a 347 Motor with a 648 - 652 Duration Cam on a 110 Lobe Sep at 650 lift, Nick William TB, FAST Intake (ported), Kooks 1 7/8 headers Stepped 2inch on 3 1/2 Collectors with a 3 1/2 inch Custom X-Pipe with Elec Waterpump & pulley through a Stage 3 Built 4L60E Trans with a Yank PT 4400 converter,on a 12 Bolt.
Any thoughts on what I can do to help out this combo. I am looking to make 440 RWHP
Sorry to the thread starter. I didn't mean to Hi Jack your thread
Seb
Any thoughts on what I can do to help out this combo. I am looking to make 440 RWHP
Sorry to the thread starter. I didn't mean to Hi Jack your thread
Seb
Originally Posted by JakeFusion™
High stalled A4s simply don't put down good dyno numbers. Unlock it and run it - it should be close. Also, you gave lift numbers, not duration for your cam.
248-252 duration.
I am wanting to make good TQ & that is why I am going with a 110 lobe sep. It just going to be really hard to tune from what my tuner says.
Looking to run 6.80 @ 101 mph in the 1/8 mile. The car is Full weight at 3600 lbs,,,,
Am I setting my goals to high.
Also I am wanting to run the Jessel rockers
Thread Starter
TECH Enthusiast
Joined: Jul 2003
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From: Ankeny, IA
Originally Posted by Brian Tooley
I have seen 2 poor results with TFS heads, yours and a guy with a C6 Vette LS2 and TFS 225 heads, the only thing in common is both combinations had YT roller rockers...
I would take the advice of Mike above...
I would take the advice of Mike above...
Thread Starter
TECH Enthusiast
Joined: Jul 2003
Posts: 507
Likes: 2
From: Ankeny, IA
Originally Posted by JakeFusion™
Isn't the "stock" pushrod length 7.700" for use with the TFS heads? If so, why would you go to a 7.500" which is .200" shorter? Even if you mill the heads .18" ~ 61cc, you'd still need 7.675" pushrods. Do the YTs require a different length pushrod?
Thread Starter
TECH Enthusiast
Joined: Jul 2003
Posts: 507
Likes: 2
From: Ankeny, IA
Originally Posted by SEBLS1
When you say overlap. Please explain. I am confused?
Not to be rude, but can you please continue this discussion via pm's or with a different thread? It's hard enough trying to get a handle on what the heck is wrong with my car without two different conversations going on.