heads only dyno
11-04-2010, 04:28 PM
#1
heads only dyno i know a lotta people talk about cam only cars but what about heads only lol. i posted this in another thread but it was kinda a thread jack so i figured id make my own....my mods are in the garage section but basically most bolt-ons, 243 heads, and 1.85 rockers.
362hp SAE
364ft-lbs SAE
370hp STD
373ft-lbs STD
AFR 12.5-12.9 to 1
11.5 zr1 rims and 315 bfg drag radials on back. car is a '98 A4 Ws6
tested on DYNOJET
362hp SAE
364ft-lbs SAE
370hp STD
373ft-lbs STD
AFR 12.5-12.9 to 1
11.5 zr1 rims and 315 bfg drag radials on back. car is a '98 A4 Ws6
tested on DYNOJET
11-05-2010, 07:34 AM
#5
11-05-2010, 08:43 AM
#6
This is what I've always wanted to try, I've always allowed myself to be talked out of it for various reasons.
A cylinder head that provides increased airflow with the same or better air speed suggests to me more power with no compromise. This has to be very good street combo.
Cam shafts, even very small always seem to present some kink somewhere.
One of my winter projects this year is with my C6 LS2, which currently has a ported Fast 90 & CAI & very near optimized tune & supporting dyno runs. Cylinder head change & Headers only then re tune & dyno.......stock cam!
To OP, excellent idea! Lets see some Heads only!
A cylinder head that provides increased airflow with the same or better air speed suggests to me more power with no compromise. This has to be very good street combo.
Cam shafts, even very small always seem to present some kink somewhere.
One of my winter projects this year is with my C6 LS2, which currently has a ported Fast 90 & CAI & very near optimized tune & supporting dyno runs. Cylinder head change & Headers only then re tune & dyno.......stock cam!
To OP, excellent idea! Lets see some Heads only!
Last edited by ctd; 11-05-2010 at 11:40 AM.
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11-05-2010, 09:26 AM
#8
basically i was trying to see how much power i could get to on stock cam. like to keep the afr in the high 12's to stay safe though. i plan to cam the car in the near future. gonna go with an EPS grind so i am sure ill be in the low 400hp range after that. just wanted to get all the other stuff outta the way so that the cam swap will be quick. dont always have access to a garage in case anything goes wrong and things take longer than they should so i gotta wait for those times to come like when my parents are away and i know i have a week or two with the garage to myself.
11-05-2010, 09:31 AM
#9
We picked up 40rwhp w/ a set of A.I. ported 241's w/ stock valves cut a mere .018. With a stock cam you could cut .030 easily and pick up more.
Whenever I start another project car I think i'll be doing something similar to this also. Probably an 02-04 LS6 camshaft, LS6 springs, LS6 intake, and A.I. ported 243's cut .035. I'm pretty confident that setup would make just as much TQ as it does HP, which would be killer.
Whenever I start another project car I think i'll be doing something similar to this also. Probably an 02-04 LS6 camshaft, LS6 springs, LS6 intake, and A.I. ported 243's cut .035. I'm pretty confident that setup would make just as much TQ as it does HP, which would be killer.
11-05-2010, 12:02 PM
#13
Been tested before with good results. For anyone interested, read this thread. Has dyno graphs and he used A.I. heads if I remember right.
https://ls1tech.com/forums/dynamomet...stock-cam.html
https://ls1tech.com/forums/dynamomet...stock-cam.html
11-08-2010, 08:28 AM
#15
We picked up 40rwhp w/ a set of A.I. ported 241's w/ stock valves cut a mere .018. With a stock cam you could cut .030 easily and pick up more.
Whenever I start another project car I think i'll be doing something similar to this also. Probably an 02-04 LS6 camshaft, LS6 springs, LS6 intake, and A.I. ported 243's cut .035. I'm pretty confident that setup would make just as much TQ as it does HP, which would be killer.
Whenever I start another project car I think i'll be doing something similar to this also. Probably an 02-04 LS6 camshaft, LS6 springs, LS6 intake, and A.I. ported 243's cut .035. I'm pretty confident that setup would make just as much TQ as it does HP, which would be killer.
Glad you guys like it!
11-08-2010, 10:18 AM
#16
[QUOTE=Advanced Induction;14093445
It certainly should, and we've got a revised 241 since the casting is both plentiful and cheap. Though the 241 is often derided or flatly ruled out, our 219cc 241 has never had an issue managing 430-470rwhp. For the $ they can be a great value. Our 241's have been tested w/ the LS6 cam, and the top-end results were impressive. At the same time, we don't recommend higher than stock rockers if there are other routes. For reference, here is a graph w/ results from both the stock LS1 grind, and GM LS6 cam. You may want to disregard the 450 # unless you run at the track w/o the accessory belt. If you like, we can supply a cam that will combine the positive attributes of both the LS1 and LS6 stock cams from the test.
It will work out great, but I'd want to build them w/ a different spring. I can also simply supply a miniature camshaft that'll run like stock, but perform better if you are inclined to go that route.
Glad you guys like it![/QUOTE]
Care to explain why you don't recommend higher ratio rockers? I understand a cam swap would yield better results... curious to know the negatives to using higher ratio rockers on stock cam profiles? Btw your cnc'd 241's are impressive to say the least!
It certainly should, and we've got a revised 241 since the casting is both plentiful and cheap. Though the 241 is often derided or flatly ruled out, our 219cc 241 has never had an issue managing 430-470rwhp. For the $ they can be a great value. Our 241's have been tested w/ the LS6 cam, and the top-end results were impressive. At the same time, we don't recommend higher than stock rockers if there are other routes. For reference, here is a graph w/ results from both the stock LS1 grind, and GM LS6 cam. You may want to disregard the 450 # unless you run at the track w/o the accessory belt. If you like, we can supply a cam that will combine the positive attributes of both the LS1 and LS6 stock cams from the test.
It will work out great, but I'd want to build them w/ a different spring. I can also simply supply a miniature camshaft that'll run like stock, but perform better if you are inclined to go that route.
Glad you guys like it!
[/QUOTE]Care to explain why you don't recommend higher ratio rockers? I understand a cam swap would yield better results... curious to know the negatives to using higher ratio rockers on stock cam profiles? Btw your cnc'd 241's are impressive to say the least!
