TFS 235cc vs Stage 3 LS6 on stroker
TFS 235cc vs Stage 3 LS6 on stroker FINAL # 545rwhp This is a 13.1 comp stage 3 LS6 head vs 11.8 comp TFS 235cc head on a 414 stroker motor compare graphs. All I did was head swap and ported the FAST. Cam is a RPM 6 244/248...612/615..112LSA. Run 125 is final #, Run 58 is LS6 with timing and run 75 is with LS6 but had to take timing out due to det. Run 120 and 122 were final but RPM got more today .The most my car made with LS6 was 537rwhp and 490rwtq but the graph is choppy from 3500 to 5000 rpm's. If you notice we only pulled run125 up to 6000rpm and 120 and 122 to 6400-6500rpm that is because it flattens from 6000 to 6500 rpm and does not drop so I shift at 6200rpm. So what do yall think? Final #'s 545rwhp 506 rwtq. As for the spike at the end the run we did after this run we took up 6500rpm and it made 543rwhp 508rwtq with out the spike.
Last edited by jeremym; Aug 24, 2007 at 12:03 AM.
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AND you actually dropped the compression by 13.1-11.8 = 1.3 pts !!! If you use the old 4% power per compression point rule, that means you WOULD have made about 1.3pt * 4 %/pt = 5.2% more power, if the TFS235 head was milled down enough to yield the 13.1. You would have then made 1.052*543rwhp = 571rwhp !!! So you would have gained 34rwhp peak and +60ft*lb throughout the curve !!!
It is interesting how the higher compression Stage 3 LS6 heads start to catch up to the lower compression TFS235 head at 6400rpm or so. They probably were so hogged out, that the poor flow velocity was killing your low/mid/fairly high end torque, until WAY up near the peak power rpm, where the flow velocity is less important.
This is where an ENGINEERED head like the TFS has enormous advantage over ported GM heads. Power throughout the band, due to high velocity AND flow.
Thanks for all the cool info, and congrats on your great setup.
It is interesting how the higher compression Stage 3 LS6 heads start to catch up to the lower compression TFS235 head at 6400rpm or so. They probably were so hogged out, that the poor flow velocity was killing your low/mid/fairly high end torque, until WAY up near the peak power rpm, where the flow velocity is less important.
This is where an ENGINEERED head like the TFS has enormous advantage over ported GM heads. Power throughout the band, due to high velocity AND flow.
Thanks for all the cool info, and congrats on your great setup.
Those are great numbers. What do the TFS's flow. I am putting that cam in my 402 on a 114 with 12.08 compression with a ported 90/90. I have Larry Meax ported AFR 225's though at 252cc's. I am affraid I am giving up bottom end with those large ports. I would guess your LS6 heads were about the same cc's. I am hoping to just make 500/490. Again, great numbers. I would be happy.
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Originally Posted by Pray
Those are great numbers. What do the TFS's flow. I am putting that cam in my 402 on a 114 with 12.08 compression with a ported 90/90. I have Larry Meax ported AFR 225's though at 252cc's. I am affraid I am giving up bottom end with those large ports. I would guess your LS6 heads were about the same cc's. I am hoping to just make 500/490. Again, great numbers. I would be happy.
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From: Was New Orleans, but swam to Baton Rouge
Originally Posted by Pray
Those are great numbers. What do the TFS's flow. I am putting that cam in my 402 on a 114 with 12.08 compression with a ported 90/90. I have Larry Meax ported AFR 225's though at 252cc's. I am affraid I am giving up bottom end with those large ports. I would guess your LS6 heads were about the same cc's. I am hoping to just make 500/490. Again, great numbers. I would be happy.
Originally Posted by Ron@Vengeance
Congrats on the #s!!! I knew it was a matter of time before you got your issues sorted out. Looks like it was all worth while.
Sorry if this is thread hijacking. That is not my intent. This will be my last post on my motor. My 383 is producing 497/457rw with a 239/244 .651/.612 112+2 so I think I am in good shape. More cubes (larger cylinder bore, the valves are a little shrowded right now) with more cam should get me more power. I did have to change back to AFR valves though to get the valve train to where I could use it, so I hope that didn't hurt any thing velocity wise. The heads did pick up about 10+cfm across the board when I did that though. I know cfm doesn't equal power. We will see.
Originally Posted by 30th t/a
wow 545rwhp NA got to be a freaking monster on the street!
are you going to be heading to the track anytime? Id love to see what that beast runs.
are you going to be heading to the track anytime? Id love to see what that beast runs.
Last edited by jeremym; Aug 25, 2007 at 12:27 PM.
Originally Posted by jeremym
What is funny I still have a 10 bolt. I race no the hwy mostly.
Hey guys if I am peaking at 6000-6100rpms does that mean my fast is choking it up? BeardWS6 I see you have a sheet metal intake. Did you do a comp between sheet metal and FAST?
Using a head designed for a 4.125" bore on a smaller bore was risky, but it looks like it works fine. To drop compression and pick up power everywhere is a testiment to how well the TFS heads work for sure.
Congrats on the results, and I know you must be happy to be able to put pump gas in your car and drive it anytime you want without detonation.
Congrats on the results, and I know you must be happy to be able to put pump gas in your car and drive it anytime you want without detonation.