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New bests with the D1SC @ 15psi
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From: Knoxville, TN
New bests with the D1SC @ 15psi Headed out to Steele Alabama today to check out the new AFR 225 heads, slow the car down a little for the upcoming Pinks all out in a couple weeks and see how the heads gaskets do.
Richened the car up some, put the 3.7 pulley back on the D1, got the BS3 boost timer workiing so I could pull a couple degrees of timing at the big end and had some pretty interesting results.
Good news is four passes and didnt push a drop of water.
Bad news (sorta) is the car picked up a sold tenth in the 1/8 with the way it was with the Dart heads. I use a TAG to predict my ETs depending on the DA and its been within a hundreth or so all last year with the D1/3.7 pulley. It said the car would run a 5.93 in the 1/8 (+300' DA), right off the trailer it ran a 5.90 but let off at 1000' or so since the track was a little rough last time I was there. Still ran a 9.30 @ 137 with a 1.27 60 foot.
So checked the water, pulled it around and stayed in it the full 1/4 - ran a 5.84 and 9.186 @ 147 in the 1/4 (1.270 60').
Checked the water, pulled it around again, spun pretty bad and aborted it and drove right back around and ran a 5.82 1/8 and 9.182 @ 144 (let off a little early and it was pretty hot) with a 1.254 60'. That is an amazing 60' on that little boost.
The car has run faster with the F1A and with the D1SC with the 3.4 but I didnt expect it to run what it did with only 15psi and the 3.7 pulley. Never pushed a drop of water either so I'll just leave it for a while. One of the few times I tried to slow the car down and it went faster lol.
No vids this time
Richened the car up some, put the 3.7 pulley back on the D1, got the BS3 boost timer workiing so I could pull a couple degrees of timing at the big end and had some pretty interesting results.
Good news is four passes and didnt push a drop of water.
Bad news (sorta) is the car picked up a sold tenth in the 1/8 with the way it was with the Dart heads. I use a TAG to predict my ETs depending on the DA and its been within a hundreth or so all last year with the D1/3.7 pulley. It said the car would run a 5.93 in the 1/8 (+300' DA), right off the trailer it ran a 5.90 but let off at 1000' or so since the track was a little rough last time I was there. Still ran a 9.30 @ 137 with a 1.27 60 foot.
So checked the water, pulled it around and stayed in it the full 1/4 - ran a 5.84 and 9.186 @ 147 in the 1/4 (1.270 60').
Checked the water, pulled it around again, spun pretty bad and aborted it and drove right back around and ran a 5.82 1/8 and 9.182 @ 144 (let off a little early and it was pretty hot) with a 1.254 60'. That is an amazing 60' on that little boost.
The car has run faster with the F1A and with the D1SC with the 3.4 but I didnt expect it to run what it did with only 15psi and the 3.7 pulley. Never pushed a drop of water either so I'll just leave it for a while. One of the few times I tried to slow the car down and it went faster lol.
No vids this time
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Thread Starter
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From: Knoxville, TN
Originally Posted by onfire
Hey, that's great news. Sounds like the AFR's are worth some power over the Darts.
How are you checking for "pushed water"? Overflow level?
How are you checking for "pushed water"? Overflow level?
I'm sure a fresh set of thicker deck heads helped some over the Darts with the water. Plus the AFR's port voume was ~6cc more then the Darts plus going from a 2.05 to 2.08 valve helped some I'm sure. Only thing I dont like is the valvetrai is considerably noisier now, probbaly because I have the 'upgrade' springs.
I'm pretty sure the F1A would have did pretty well but honestly I'm real happy with how the car is running right now and as tempting as it is to throw it back on and head to the same track tomorrow (they are open and the weather is going to be the same) I'm not going to do it. I'll save it for a new engine in the fall..
Great run!
Which AFR 225 heads did you go with? 65cc 3.9 heads or large bore?
At what RPM did you see 15psi? seams pretty high for better flowing heads and I assume 52219 rpm of impeller speed at 6500.
Which AFR 225 heads did you go with? 65cc 3.9 heads or large bore?
At what RPM did you see 15psi? seams pretty high for better flowing heads and I assume 52219 rpm of impeller speed at 6500.
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From: Knoxville, TN
Originally Posted by Fraser@speedinc
Great run!
Which AFR 225 heads did you go with? 65cc 3.9 heads or large bore?
At what RPM did you see 15psi? seams pretty high for better flowing heads and I assume 52219 rpm of impeller speed at 6500.
Which AFR 225 heads did you go with? 65cc 3.9 heads or large bore?
At what RPM did you see 15psi? seams pretty high for better flowing heads and I assume 52219 rpm of impeller speed at 6500.
They are the 65cc 3.9 heads, ~9.3:1 compression 347.
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From: Knoxville, TN
Originally Posted by Pro Stock John
Cool, so the AFR's worked better for you all around, and potentially solved your problem.
We'll see after a few more days at the track about the water, if I would have surfaced the darts the last time I had them off they may have worked again for a while but I wanted to try 3.9 bore heads and gaskets. We'll see what happens in 20 more passes but once it warms up out the car wont be making this power so it should last a while..
Kp did you happen to have the 205 Darts or 225 darts??
I believe GM high tech did a Head comparison offering Trickflow, AFR, Dart, ported LS6 heads, etc and the darts only flow like 275 at .600 lift
I believe they tested the 205 AFR and it flowed 304 or something along those lines at the same lift. Your 225 heads are moving some air in my opinion, Btw what springs are you running on those heads (did you ditch the 918 beehives?)
I believe GM high tech did a Head comparison offering Trickflow, AFR, Dart, ported LS6 heads, etc and the darts only flow like 275 at .600 lift
I believe they tested the 205 AFR and it flowed 304 or something along those lines at the same lift. Your 225 heads are moving some air in my opinion, Btw what springs are you running on those heads (did you ditch the 918 beehives?)
Originally Posted by Urban Legend
You get new bests on a monthly basis don't you? Congratulations for this month. 
You noticed that too? He's my hero, he's has more miles in the 1320 than
I have on my car total!
Nice job KP! 
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From: Knoxville, TN
Originally Posted by T/A KID
Kp did you happen to have the 205 Darts or 225 darts??
I believe GM high tech did a Head comparison offering Trickflow, AFR, Dart, ported LS6 heads, etc and the darts only flow like 275 at .600 lift I believe they tested the 205 AFR and it flowed 304 or something along those lines at the same lift. Your 225 heads are moving some air in my opinion, Btw what springs are you running on those heads (did you ditch the 918 beehives?)
I believe GM high tech did a Head comparison offering Trickflow, AFR, Dart, ported LS6 heads, etc and the darts only flow like 275 at .600 lift
I believe they tested the 205 AFR and it flowed 304 or something along those lines at the same lift. Your 225 heads are moving some air in my opinion, Btw what springs are you running on those heads (did you ditch the 918 beehives?)I dont pay a whole lot of attention to magazine articles but the Darts served me well for a year and I have nothing bad to say against them, car ran 150mph with them a month ago
I'm way more concerned with head gasket sealing then 20cfm of head flow on a blower car but I suspect the exhaust port is where it picked up if anywhere.. Thread Starter
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From: Knoxville, TN
Originally Posted by blackz93
Awesome man!!
PINKS in Rockingham?
PINKS in Rockingham?