Darton 427 ls6 headed dyno results...
02-22-2007, 07:58 PM
#1
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Darton 427 ls6 headed dyno results... 
Not bad, but I think the cam being so large may be hurting my torque numbers..480tq is low I think, I would expect atleast 500. There's a dip there at 2500 rpm that I think is cam related as well. Not to mention it kinda flat lines at 6 where I figured it would climb a little bit more then it did. Maybe the fast intake it just restricting it also.
I'm happy overall, the car hauls ***, What do you guys think?
02-22-2007, 08:47 PM
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427, actually anything over 402 should crack over 500rwtq.
You could have the power currently, and you could be missing out on the tune.
For reassurance the 346 is putting out 465rwtq today with stock bottom end.
You have 81 more cubic inches than that, no reason you shoulndt be over 520rwtq actually.
You could have the power currently, and you could be missing out on the tune.
For reassurance the 346 is putting out 465rwtq today with stock bottom end.
You have 81 more cubic inches than that, no reason you shoulndt be over 520rwtq actually.
02-22-2007, 09:20 PM
#4
I'm sorry, but those numbers are a bit weak for a 408. Now don't get me wrong, 525/485 is very strong, but compared to other 427 combos it isn't breaking any records. I think the cam is hurting it - bump that compression up to 12.5:1 to take advantage of it or replace it. The tuning could also be an issue.
Some other 427 out there look like this:
Most of MTI's 427s (how come no one ever talks about them?) have a 236/236 114 in them or a 244/244 112 and they hit 550/520 with Kooks 1-7/8", ported LS6 heads, and a FAST 90.
I've seen 565rwhp and 540rwtq out of LG with AFR 225s and the G5X4 on a 427.
Rapid has done a few 427s that are between 570-600rwhp and have more than 520rwtq.
A&A Corvette (not a sponsor here, but people know them) ususally does 550/520+ with smaller cams (232/236) and AFR/ET heads.
LPE even did 530/520ish with a 229 cam and LS6 heads and FAST 90.
And of course both Cartek and ECS have done 600rwhp with a 427 with LS6 heads and a FAST 90.
With those Cartek heads I'd expect it to easily break 550rwhp. I know Cartek does really big cams on really wide LSAs with fairly low compression. Might want to talk to them to see what they recommend to go with those heads. I know on one of their 447s with Stage 5 LS6 heads it had a 260/260 114 in it and it worked well somehow.
Some other 427 out there look like this:
Most of MTI's 427s (how come no one ever talks about them?) have a 236/236 114 in them or a 244/244 112 and they hit 550/520 with Kooks 1-7/8", ported LS6 heads, and a FAST 90.
I've seen 565rwhp and 540rwtq out of LG with AFR 225s and the G5X4 on a 427.
Rapid has done a few 427s that are between 570-600rwhp and have more than 520rwtq.
A&A Corvette (not a sponsor here, but people know them) ususally does 550/520+ with smaller cams (232/236) and AFR/ET heads.
LPE even did 530/520ish with a 229 cam and LS6 heads and FAST 90.
And of course both Cartek and ECS have done 600rwhp with a 427 with LS6 heads and a FAST 90.
With those Cartek heads I'd expect it to easily break 550rwhp. I know Cartek does really big cams on really wide LSAs with fairly low compression. Might want to talk to them to see what they recommend to go with those heads. I know on one of their 447s with Stage 5 LS6 heads it had a 260/260 114 in it and it worked well somehow.
02-22-2007, 09:33 PM
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I'll give Cartek a call and talk to dave..myabe see what he says. I was hoping for a little more power then what I have. Something is wrong somewhere to not be getting bigger torque numbers.
Originally Posted by JakeFusion™
I'm sorry, but those numbers are a bit weak for a 408. Now don't get me wrong, 525/485 is very strong, but compared to other 427 combos it isn't breaking any records. I think the cam is hurting it - bump that compression up to 12.5:1 to take advantage of it or replace it. The tuning could also be an issue.
Some other 427 out there look like this:
Most of MTI's 427s (how come no one ever talks about them?) have a 236/236 114 in them or a 244/244 112 and they hit 550/520 with Kooks 1-7/8", ported LS6 heads, and a FAST 90.
I've seen 565rwhp and 540rwtq out of LG with AFR 225s and the G5X4 on a 427.
Rapid has done a few 427s that are between 570-600rwhp and have more than 520rwtq.
A&A Corvette (not a sponsor here, but people know them) ususally does 550/520+ with smaller cams (232/236) and AFR/ET heads.
LPE even did 530/520ish with a 229 cam and LS6 heads and FAST 90.
And of course both Cartek and ECS have done 600rwhp with a 427 with LS6 heads and a FAST 90.
With those Cartek heads I'd expect it to easily break 550rwhp. I know Cartek does really big cams on really wide LSAs with fairly low compression. Might want to talk to them to see
what they recommend to go with those heads. I know on one of their 447s with Stage 5 LS6 heads it had a 260/260 114 in it and it worked well somehow.
Some other 427 out there look like this:
Most of MTI's 427s (how come no one ever talks about them?) have a 236/236 114 in them or a 244/244 112 and they hit 550/520 with Kooks 1-7/8", ported LS6 heads, and a FAST 90.
I've seen 565rwhp and 540rwtq out of LG with AFR 225s and the G5X4 on a 427.
Rapid has done a few 427s that are between 570-600rwhp and have more than 520rwtq.
A&A Corvette (not a sponsor here, but people know them) ususally does 550/520+ with smaller cams (232/236) and AFR/ET heads.
LPE even did 530/520ish with a 229 cam and LS6 heads and FAST 90.
And of course both Cartek and ECS have done 600rwhp with a 427 with LS6 heads and a FAST 90.
With those Cartek heads I'd expect it to easily break 550rwhp. I know Cartek does really big cams on really wide LSAs with fairly low compression. Might want to talk to them to see
what they recommend to go with those heads. I know on one of their 447s with Stage 5 LS6 heads it had a 260/260 114 in it and it worked well somehow.
02-22-2007, 09:42 PM
#6
You dynamic compression must be pretty low because your low and mid-range torque is lacking. Bet if you advanced the cam 4 degrees you'd really pump up your torque and not hurt the top-end power too much.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
02-22-2007, 10:28 PM
#7
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Patrick G.
What were saying, is the low RWTQ showing something is amiss.
It could be cam timing issue, cyllinder slightly down, anything.
Once he gets it right, RWTQ is going to be what it "should" be ( 510rwtq-520rwtq )
and power will come right on up with it.
What were saying, is the low RWTQ showing something is amiss.
It could be cam timing issue, cyllinder slightly down, anything.
Once he gets it right, RWTQ is going to be what it "should" be ( 510rwtq-520rwtq )
and power will come right on up with it.
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02-23-2007, 12:44 AM
#8
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I just got it tuned, and my tuner is pretty good. I don't know what could be a miss, the car runs awesome. I think it's the cam...i've seen a couple other cube motors (mostly 408's) with this cam doing only 480 rwtq aswell.
Heres one for starters ...it even has the same dip at 2500 I do.
https://ls1tech.com/forums/showthrea...ht=texas+giant
Heres one for starters ...it even has the same dip at 2500 I do.
https://ls1tech.com/forums/showthrea...ht=texas+giant
Last edited by jermzz; 02-23-2007 at 01:15 AM.
02-23-2007, 07:38 AM
#12
Originally Posted by jermzz
Not bad, but I think the cam being so large may be hurting my torque numbers..480tq is low I think, I would expect atleast 500. There's a dip there at 2500 rpm that I think is cam related as well. Not to mention it kinda flat lines at 6 where I figured it would climb a little bit more then it did. Maybe the fast intake it just restricting it also.
I'm happy overall, the car hauls ***, What do you guys think?
02-26-2007, 11:08 AM
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What gets me is the ratio doesnt match. 525hp to 563 = 38hp 482 tq to 530 = 48tq Dynapak usually dyno higher cause it's at the axels, I was told it was corrected 10% down.
There was one stock c6 there that dyno'd 330 and one with exhaust that dynod 350, I figured this was pretty close to what it should be no?
Would a dyno show higher or lower numbers if they had the wrong gear ratio? I think the dynojet I dynod on may havehad 4.10 instead of 4.11's for the rear, not sure how much of a difference it would make.
There was one stock c6 there that dyno'd 330 and one with exhaust that dynod 350, I figured this was pretty close to what it should be no?
Would a dyno show higher or lower numbers if they had the wrong gear ratio? I think the dynojet I dynod on may havehad 4.10 instead of 4.11's for the rear, not sure how much of a difference it would make.