Make a Hypothesis on my setup.
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Make a Hypothesis on my setup. Hey boys/lady's Im doing a H/C/I install in this crappy winter weather in my non heated garage. Here is what Im installing, please post your thoughts about my setup and my possible rwhp/tq #'s. Thanks! 
AFR 205 59cc Heads, dual spring upgrade, ti-retainers.
Comp cams cust. grind 230/234 591/598 114+4
QTP HVMC Stainless headers with QTP Catted Y pipe
Magnaflow Catback
LS6 Intake
Hardened Pushrods
SVO 30# Injectors
ASP Underdive pulley
SLP Lid, Ls2 chains, Ls6 oil pump all the necessities.
This is all through an M6 and a stock rearend. Im hoping for 450-470 rwhp and 400-420 rwtq.
AFR 205 59cc Heads, dual spring upgrade, ti-retainers.
Comp cams cust. grind 230/234 591/598 114+4
QTP HVMC Stainless headers with QTP Catted Y pipe
Magnaflow Catback
LS6 Intake
Hardened Pushrods
SVO 30# Injectors
ASP Underdive pulley
SLP Lid, Ls2 chains, Ls6 oil pump all the necessities.
This is all through an M6 and a stock rearend. Im hoping for 450-470 rwhp and 400-420 rwtq.
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Originally Posted by SideStep
You are going to need a FAST 90/90 to hit that number, unless you plan on spending tons of time on the dyno. I have 83 pulls and hundreds of midnight blast on deserted roads...
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Joined: Mar 2003
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Guys stop worrying about static compression ratios... DCR is where it is at...
Your DCR should be around 8.6 with those mods, I am assuming you fly-cut your pistons (1cc) and you are using factory composite head gaskets. Mine was 8.38 and I was running up against KR and had to reduce timing in some areas.
Other than that I think determining your HP before you modify and/or dyno is asking for it... Not trying to rain on your parade. I had a little more cam (232/236) then you and was able to hit 450rwhp but I lived on the dyno for weeks... A FAST 90/90 setup would have made it a walk in the park... If you have the option it will make your goals easier to hit....
Your DCR should be around 8.6 with those mods, I am assuming you fly-cut your pistons (1cc) and you are using factory composite head gaskets. Mine was 8.38 and I was running up against KR and had to reduce timing in some areas.
Other than that I think determining your HP before you modify and/or dyno is asking for it... Not trying to rain on your parade. I had a little more cam (232/236) then you and was able to hit 450rwhp but I lived on the dyno for weeks... A FAST 90/90 setup would have made it a walk in the park... If you have the option it will make your goals easier to hit....
Thread Starter
12 Second Club
Joined: Jul 2005
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Originally Posted by SideStep
Guys stop worrying about static compression ratios... DCR is where it is at...
Your DCR should be around 8.6 with those mods, I am assuming you fly-cut your pistons (1cc) and you are using factory composite head gaskets. Mine was 8.38 and I was running up against KR and had to reduce timing in some areas.
Other than that I think determining your HP before you modify and/or dyno is asking for it... Not trying to rain on your parade. I had a little more cam (232/236) then you and was able to hit 450rwhp but I lived on the dyno for weeks... A FAST 90/90 setup would have made it a walk in the park... If you have the option it will make your goals easier to hit....
Your DCR should be around 8.6 with those mods, I am assuming you fly-cut your pistons (1cc) and you are using factory composite head gaskets. Mine was 8.38 and I was running up against KR and had to reduce timing in some areas.
Other than that I think determining your HP before you modify and/or dyno is asking for it... Not trying to rain on your parade. I had a little more cam (232/236) then you and was able to hit 450rwhp but I lived on the dyno for weeks... A FAST 90/90 setup would have made it a walk in the park... If you have the option it will make your goals easier to hit....
A friend had the exact same setup but with stainless works headers and a smaller cam and made 440rwhp. With a larger cam and hvmc qtp's I should see around 450.
Originally Posted by Ouchburns
A friend had the exact same setup but with stainless works headers and a smaller cam and made 440rwhp. With a larger cam and hvmc qtp's I should see around 450.
I know people that have identical setups and are completely different animals. Just cause you have a big cam isnt going to give you big hp/tq. there are several moderate cams that will give you better overall power/performance....Take my cam for instance. It will make 430 easily...at 7200rpms. It is basically useable up in the 4000+ mark. But Side is right about the 90/90. As a rule of thumb, these engines work like compressors. Therefore...more air = more power output. You can't run too much good airflow through an LS1/LS6 engine.
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Verdad Gallardo Thread Starter
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Originally Posted by orangeapeel
You definitely have the heads for big power, so don't sell yourself short on the LS6 when you could actually benefit from a 90mm setup.
fast 90/90 is not in the budget at this time, but I will be getting one evnetually, I picked up the slp ls6 manifold with no provisons. Thanks for the input so far guys.
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Joined: Jun 2005
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From: England
Originally Posted by Ouchburns
A friend had the exact same setup but with stainless works headers and a smaller cam and made 440rwhp. With a larger cam and hvmc qtp's I should see around 450.
Also what type of dyno as this can drastically affect your results. Common dyno's are Mustang and Dynojet, but there are many more.
A 450rwhp Dynojet reading is about equal to ~420rwhp on a Mustang Dyno.
If you're after the biggest dyno number make sure you use a Dynojet, although as I understand it the load bearing Mustang Dyno's are better for tuning and give a better "real world" comparable number.
Originally Posted by Ouchburns
Remember my heads are milled .042 for 11.3:1 comp ratio, every .1 increase in compression results in 4% more hp.
its every 1 full point of compression for 4%
Last edited by Steel Chicken; Mar 3, 2006 at 10:26 AM.