Afr heads and new tune on my 383
06-06-2013, 07:06 PM
#1
Afr heads and new tune on my 383 Ok here goes.
94 lt1, 383
Splayed 4 bolt, 10 5:1 compression
Gm847 cam
Afr 210 heads (race ready)
Built A4, ptc 3600 stall, pacesetter longtubes.
UNLOCKED on the dynojet made 351/334 sae. A/F was right arou d the 12s the whole time...nkt sure where timing was. I the 30s if i recall. What do you think?
94 lt1, 383
Splayed 4 bolt, 10 5:1 compression
Gm847 cam
Afr 210 heads (race ready)
Built A4, ptc 3600 stall, pacesetter longtubes.
UNLOCKED on the dynojet made 351/334 sae. A/F was right arou d the 12s the whole time...nkt sure where timing was. I the 30s if i recall. What do you think?
06-06-2013, 07:31 PM
#2
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Ok here goes.
94 lt1, 383
Splayed 4 bolt, 10 5:1 compression
Gm847 cam
Afr 210 heads (race ready)
Built A4, ptc 3600 stall, pacesetter longtubes.
UNLOCKED on the dynojet made 351/334 sae. A/F was right arou d the 12s the whole time...nkt sure where timing was. I the 30s if i recall. What do you think?
94 lt1, 383
Splayed 4 bolt, 10 5:1 compression
Gm847 cam
Afr 210 heads (race ready)
Built A4, ptc 3600 stall, pacesetter longtubes.
UNLOCKED on the dynojet made 351/334 sae. A/F was right arou d the 12s the whole time...nkt sure where timing was. I the 30s if i recall. What do you think?
06-06-2013, 07:37 PM
#3
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Nice set up, would like to have it...a lot lol. Idk it seems like maybe it could have made a little better numbers I thought heads and a cam was good for like 400. I'm basing this off of other builds I've read about. None the less sounds like it rips!
06-06-2013, 09:26 PM
#5
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I just got my Camaro tuned Tuesday on a dynojet .. Made 356 hp 387 torq.. He told me that's like 440 crank with the correction factor.. Car has eagle 383 rotation assembly. Pacesetter LT's, twin 58, stock heads with 1.6.1 rockers and cc503 cam.. Those numbers seem really low to me.. My car has 11.3.1 cr
06-06-2013, 09:39 PM
#7
I just got my Camaro tuned Tuesday on a dynojet .. Made 356 hp 387 torq.. He told me that's like 440 crank with the correction factor.. Car has eagle 383 rotation assembly. Pacesetter LT's, twin 58, stock heads with 1.6.1 rockers and cc503 cam.. Those numbers seem really low to me.. My car has 11.3.1 cr
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06-06-2013, 09:42 PM
#8
Ok here goes.
94 lt1, 383
Splayed 4 bolt, 10 5:1 compression
Gm847 cam
Afr 210 heads (race ready)
Built A4, ptc 3600 stall, pacesetter longtubes.
UNLOCKED on the dynojet made 351/334 sae. A/F was right arou d the 12s the whole time...nkt sure where timing was. I the 30s if i recall. What do you think?
94 lt1, 383
Splayed 4 bolt, 10 5:1 compression
Gm847 cam
Afr 210 heads (race ready)
Built A4, ptc 3600 stall, pacesetter longtubes.
UNLOCKED on the dynojet made 351/334 sae. A/F was right arou d the 12s the whole time...nkt sure where timing was. I the 30s if i recall. What do you think?
Numbers definately sound on the low end especially the torque. The true indicator of power will be your ET at the track.
06-06-2013, 10:18 PM
#9
The 10.5:1 was speccd with 57cc chambers on the afr heads, pistons .020 below the deck, a .027 squished head gasket with a 4.1? Hole, and with -16c dished pistons.
I just found out why I lost 4th after a burnout tonite. Trans was low on fluid, so its a good chance it was slipping on the dyno (just picked it up this afternoon) plus the numbers shod read low anyways, since it wasnt locked on the dyno.... Right?
I just found out why I lost 4th after a burnout tonite. Trans was low on fluid, so its a good chance it was slipping on the dyno (just picked it up this afternoon) plus the numbers shod read low anyways, since it wasnt locked on the dyno.... Right?
06-07-2013, 12:30 AM
#10
On The Tree
10.5:1 is way too low for that camshaft. Assuming you used stock length rods and installed that cam as ground (107 ICL), you're just below 7.7:1 dynamic compression ratio. That's very, VERY low... I like to see a "hot street" pump gas engine up around 8.8:1 - 9.0:1. That's why your power numbers are off.
The 847 is a great camshaft (see my signature). I use it often... In most cases, I prefer it to the XFI grinds everybody is using now for numerous reasons, but you do need some compression to make things happy when using it.
The rest of your choices are good, but flat top pistons would have been your friend...
The 847 is a great camshaft (see my signature). I use it often... In most cases, I prefer it to the XFI grinds everybody is using now for numerous reasons, but you do need some compression to make things happy when using it.
The rest of your choices are good, but flat top pistons would have been your friend...
06-07-2013, 07:32 AM
#11
10.5:1 is way too low for that camshaft. Assuming you used stock length rods and installed that cam as ground (107 ICL), you're just below 7.7:1 dynamic compression ratio. That's very, VERY low... I like to see a "hot street" pump gas engine up around 8.8:1 - 9.0:1. That's why your power numbers are off.
The 847 is a great camshaft (see my signature). I use it often... In most cases, I prefer it to the XFI grinds everybody is using now for numerous reasons, but you do need some compression to make things happy when using it.
The rest of your choices are good, but flat top pistons would have been your friend...
The 847 is a great camshaft (see my signature). I use it often... In most cases, I prefer it to the XFI grinds everybody is using now for numerous reasons, but you do need some compression to make things happy when using it.
The rest of your choices are good, but flat top pistons would have been your friend...
And how do you calculate the dynamic CR?
06-07-2013, 11:05 AM
#12
Is it a 10.5:1 SCR spec'd with what size CC heads? If it was spec'd 10:5:1 with factory chambers the large ones on the AFR's will bring it down considerably.
Numbers definately sound on the low end especially the torque. The true indicator of power will be your ET at the track.
Numbers definately sound on the low end especially the torque. The true indicator of power will be your ET at the track.
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NewOrleansLT1 (01-29-2023)
06-07-2013, 02:13 PM
#19
I milled the heads as small as i could without angle milling (57cc chambers) and I used the thinnest head gasket I was confertable with (a 200 dollar pair of Cometic MLS .027 gaskets)
I did what I could with the compression with the parts I have. An Extreemly reputable local builder built the motor for me, and also did the heads. His reasoning for the dished pistons was "yeah, you could bump your compression up by two points likely. Your tune would have to be very spot on to run the crap gas we have around here, and 10.5:1 gives you the option of running a bit of boost in the future, or just sprayng it."
It sees the track mabey once a year.
I talked to the tuner, he said that timing was right at 35. so thats good. its a bit surgy on the highway and at low speeds, but pulls smooth. I think that may be the cam though. I'd like to get a cam that's better suited to lower compression motors, but I'm not sure what direction to go.