280XFI Cam
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Race Director
Joined: Nov 2003
Posts: 12,220
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
There were extensive studies performed. Due to the effects of global warming (and the associated depletion of oxygen), XFI cams have lost .000001hp.
They also determined that cams with more overlap, lift, and or duration still make more power!
They also determined that cams with more overlap, lift, and or duration still make more power!
Race Director
Joined: Nov 2003
Posts: 12,220
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Which intake did you like better? The one that got you 10 more HP or the one with 25ft/lbs more torque?
Thread Starter
Advanced
Joined: Mar 2010
Posts: 54
Likes: 0
17 more HP!
Hp peaked at 5600 with SR and the MR peaked at 6100. With 3.73's the car peak 5600 going through the lights @ 112mph and this is shifting at 5900. No track times with the MR yet but I'm quite sure with the MR it would have at least gave me 114+ at a higher shift point. The car has a T5 Trans and the 60ft was around 1.80's.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Race Director
Joined: May 2003
Posts: 10,749
Likes: 41
Well I have TFS heads. They were flowed @ 270cfm's. Dr J's Performance has them right now. When he gets through they should flow 295-305cfm's with a 2.05 intake valve(5/16 and more head porting).
17 more HP!
Hp peaked at 5600 with SR and the MR peaked at 6100. With 3.73's the car peak 5600 going through the lights @ 112mph and this is shifting at 5900. No track times with the MR yet but I'm quite sure with the MR it would have at least gave me 114+ at a higher shift point. The car has a T5 Trans and the 60ft was around 1.80's.
17 more HP!
Hp peaked at 5600 with SR and the MR peaked at 6100. With 3.73's the car peak 5600 going through the lights @ 112mph and this is shifting at 5900. No track times with the MR yet but I'm quite sure with the MR it would have at least gave me 114+ at a higher shift point. The car has a T5 Trans and the 60ft was around 1.80's.
what are you expected those TFS to pour to flow 295-305cfm?
did they start life as 195's?
Thread Starter
Advanced
Joined: Mar 2010
Posts: 54
Likes: 0
Race Director
Joined: May 2003
Posts: 10,749
Likes: 41
Back to my question. What do you expect these runners to measure? I was more curious about runner size then cfm numbers.
This is what my old TFS heads flowed: 195 cc head.
.200 lift(intake/exhaust) Trickflow-138/98
.300 lift(intake/exhaust) Trickflow-190/130
.400 lift(intake/exhaust) Trickflow-230/156
.500 lift(intake/exhaust) Trickflow-253/174
.600 lift(intake/exhaust) Trickflow- 260/185
Last edited by 88BlackZ-51; Feb 18, 2012 at 08:29 PM.
Thread Starter
Advanced
Joined: Mar 2010
Posts: 54
Likes: 0
Sounds good. I bought similar heads about 6 years back.
Back to my question. What do you expect these runners to measure? I was more curious about runner size then cfm numbers.
This is what my old TFS heads flowed: 195 cc head.
.200 lift(intake/exhaust) Trickflow-138/98
.300 lift(intake/exhaust) Trickflow-190/130
.400 lift(intake/exhaust) Trickflow-230/156
.500 lift(intake/exhaust) Trickflow-253/174
.600 lift(intake/exhaust) Trickflow- 260/185
Back to my question. What do you expect these runners to measure? I was more curious about runner size then cfm numbers.
This is what my old TFS heads flowed: 195 cc head.
.200 lift(intake/exhaust) Trickflow-138/98
.300 lift(intake/exhaust) Trickflow-190/130
.400 lift(intake/exhaust) Trickflow-230/156
.500 lift(intake/exhaust) Trickflow-253/174
.600 lift(intake/exhaust) Trickflow- 260/185
I have no idea. All I know is that Dr. J says he can make them flow -295-305cfm's and the opening of the runner is 2.4x sq inches.
Racer
Joined: Oct 2007
Posts: 478
Likes: 1
Safety Car
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
Race Director
Joined: Jan 2012
Posts: 17,062
Likes: 166
From: United States
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Which is why I posted the 1st link about it
LE Ported TFS 195's
Finished intake port volume 205 cc
Exhaust port finished volume 76 cc
.200 @ 140 / 108
.300 @ 200 / 144
.400 @ 245 / 176
.500 @ 274 / 190
.550 @ 280
.600 @ 282 / 204
Greatest RWHP achieved: 389
Best ET: 11.98
Best MPH: 119
Last edited by rodj; Feb 19, 2012 at 02:19 AM.
Race Director
Joined: Jan 2012
Posts: 17,062
Likes: 166
From: United States
I had an 280XFI cam as it was recommended to me before I knew of this and other forums with people who could guide me better.
I made 419 in a 396LT1 with AFR heads, old 195's. But on another dyno it made 405. Same temp, but different dyno same brand and both were SAE.
Tuner can make a helluva difference too.
Who would you recommend for camshafts?
I made 419 in a 396LT1 with AFR heads, old 195's. But on another dyno it made 405. Same temp, but different dyno same brand and both were SAE.
Tuner can make a helluva difference too.
Who would you recommend for camshafts?
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
everyone has their preference cris straub straubtechnologies.com will get ot right the first time.
ud Harold is good
some guys like mike Jones. more specs you have better cam youll get.
ud Harold is good
some guys like mike Jones. more specs you have better cam youll get.
Race Director
Joined: Jan 2012
Posts: 17,062
Likes: 166
From: United States