Paging Chris B and other HC smart guys :)
01-07-2002, 10:18 AM
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Paging Chris B and other HC smart guys :) Hi guys,
Right now I am running blower ported S1 ARE heads with 2.02 and 1.57 valves and about 9.7:1 compression. It was originally built for a blower but I am now running NA. (Car is running mid 11's@116.5mph with traction problems on motor.)
I am running a B1 cam (221/221 114LSA and 558 lift.
The rest of my combo is the following:
TP 4400 converter,
12 bolt with 4.11's and spool
26 inch slicks
LS6 intake, ported Tbody
MAC headers with ported primaries and true duals. (Going back to 3 inch int pipe eventually)
My question is this <img src="gr_stretch.gif" border="0">
What would I gain by going with a more aggressive cam (say a 226 or so cam on 114LSA and .55x lift) and further porting my heads and upping the compression to 11.2:1 with dual springs?
Would it be worth the cost and money to swap the cam and pull the heads for this work? How much do you think I'll gain if any? Should I just pull the heads, do the port work and up the compression and leave the cam alone? I need to pass emissions as well.
What are your thoughts? <img src="gr_grin.gif" border="0">
Thanks again,
Chris
Right now I am running blower ported S1 ARE heads with 2.02 and 1.57 valves and about 9.7:1 compression. It was originally built for a blower but I am now running NA. (Car is running mid 11's@116.5mph with traction problems on motor.)
I am running a B1 cam (221/221 114LSA and 558 lift.
The rest of my combo is the following:
TP 4400 converter,
12 bolt with 4.11's and spool
26 inch slicks
LS6 intake, ported Tbody
MAC headers with ported primaries and true duals. (Going back to 3 inch int pipe eventually)
My question is this <img src="gr_stretch.gif" border="0">
What would I gain by going with a more aggressive cam (say a 226 or so cam on 114LSA and .55x lift) and further porting my heads and upping the compression to 11.2:1 with dual springs?
Would it be worth the cost and money to swap the cam and pull the heads for this work? How much do you think I'll gain if any? Should I just pull the heads, do the port work and up the compression and leave the cam alone? I need to pass emissions as well.
What are your thoughts? <img src="gr_grin.gif" border="0">
Thanks again,
Chris
01-07-2002, 11:24 AM
#2
Re: Paging Chris B and other HC smart guys :) Well, we can suppose... But I suspect that we need some "better info" to give you the real breakdown. Any dyno #s? And flow data on the heads?
If we can presume you are making around 385-390 rwhp and you have good mid-lift flow, a more agressive cam than the B1 on a 112 would get you 5-6 hp through the area you are looking for. Better heads, while not actually having the data, *might* get you another 10hp where you need it. I then worry that you would have too much stall. The gearing is excellent for the 1/4, but I wonder with 410 rwhp and more torque if you really are stalling at 4400. If you start to push that stall up, then you wont be taking advantage of most of the area under the curve that you just gained by going with the other cam. What is your exhaust situation?
chris (n)
If we can presume you are making around 385-390 rwhp and you have good mid-lift flow, a more agressive cam than the B1 on a 112 would get you 5-6 hp through the area you are looking for. Better heads, while not actually having the data, *might* get you another 10hp where you need it. I then worry that you would have too much stall. The gearing is excellent for the 1/4, but I wonder with 410 rwhp and more torque if you really are stalling at 4400. If you start to push that stall up, then you wont be taking advantage of most of the area under the curve that you just gained by going with the other cam. What is your exhaust situation?
chris (n)
01-07-2002, 11:32 AM
#3
Re: Paging Chris B and other HC smart guys :) OK... I read some more.
You are doing ok with the exhaust for your stall. If your stall was lower, I'd think a set of longtubes would help... But your stall is pretty well up there. I would also venture that the compression might get you 10hp more. For some reason on these LS1s lower compression really hasnt hurt folks as much as previous engines. Better dynamic compression must be the culprit.
As far as if its worth the $... Lets assume you could sell your heads for 1300 outright, and the new heads would be 2400 outright. We'll also assume you are doing the install yourself. $200 for bolts and gaskets... 1300$ for potentially 15-20hp. Then do the cam while your in there. Sell the B1 for $200. $250 for 5 or so hp.
Both sound like a good deal where you are at... I sure would buy 15 hp for $1300 at this point :-/ It doesnt come that cheap anymore, unless the EWP turns out to be worth 15+.
chris (n)
You are doing ok with the exhaust for your stall. If your stall was lower, I'd think a set of longtubes would help... But your stall is pretty well up there. I would also venture that the compression might get you 10hp more. For some reason on these LS1s lower compression really hasnt hurt folks as much as previous engines. Better dynamic compression must be the culprit.
As far as if its worth the $... Lets assume you could sell your heads for 1300 outright, and the new heads would be 2400 outright. We'll also assume you are doing the install yourself. $200 for bolts and gaskets... 1300$ for potentially 15-20hp. Then do the cam while your in there. Sell the B1 for $200. $250 for 5 or so hp.
Both sound like a good deal where you are at... I sure would buy 15 hp for $1300 at this point :-/ It doesnt come that cheap anymore, unless the EWP turns out to be worth 15+.
chris (n)
01-07-2002, 11:33 AM
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Re: Paging Chris B and other HC smart guys :) The heads flow aprox 285cfm at 550 lift.
The car dynoed 400RWHP with the six speed but I have since changed to an Yank 4L70 A4 and 12 bolt with spool and 4.11 from the stock rear. My power peaked at 365RWHP and 404RWTQ after the swap but I am working out issues. (Vac leak, fuel issues, cat converter problems etc) Most of the loss in power is from the tranny and converter, rear etc. The dynos were all through cats as well.
Exhaust is ported MACs with 3 inch collector mod and 3 inch cats. I also have an offroad Ypipe and duals I can use as well. I am primarily interested in picking up power from 4500-6500 rpm. I think with the 1.4 point increase in compression I will pick up about 10RWTQ and 6RWHP plus whatever gains I get from aggressively porting the heads. I am not sure what I will gain with the cam though. I am keeping my rev limit at 6600rpms and will be using stock program with HPP+ for rev limit etc and ported MAF.
Thanks,
Chris
The car dynoed 400RWHP with the six speed but I have since changed to an Yank 4L70 A4 and 12 bolt with spool and 4.11 from the stock rear. My power peaked at 365RWHP and 404RWTQ after the swap but I am working out issues. (Vac leak, fuel issues, cat converter problems etc) Most of the loss in power is from the tranny and converter, rear etc. The dynos were all through cats as well.
Exhaust is ported MACs with 3 inch collector mod and 3 inch cats. I also have an offroad Ypipe and duals I can use as well. I am primarily interested in picking up power from 4500-6500 rpm. I think with the 1.4 point increase in compression I will pick up about 10RWTQ and 6RWHP plus whatever gains I get from aggressively porting the heads. I am not sure what I will gain with the cam though. I am keeping my rev limit at 6600rpms and will be using stock program with HPP+ for rev limit etc and ported MAF.
Thanks,
Chris