Need some Help with Modding My LS1!!
Thread Starter
Burning Brakes
Joined: Jun 2008
Posts: 838
Likes: 5
From: San Diego CA
Need some Help with Modding My LS1!!
Whats up? I bought my 99 c5 about a month ago, and my HP goals for this car are 450whp. I need some help figuring out what mods to get me there without going forced induced, or straping nitrous. what can a ls6 intake manifold handle, and how much can one be had for? I am not against Forced Induction just wondering what it would take to get 450 on motor alone without No2? thanks for the help.
Last edited by stryderss; Jan 5, 2009 at 12:38 AM. Reason: making it clear lol
Tech Contributor
Joined: Jan 2007
Posts: 19,401
Likes: 1,141
From: Dyer, IN
Whats up? I bought my 99 c5 about a month ago, and my HP goals for this car are 450whp. I need some help figuring out what mods to get me there without going forced induced, and nitrous. Would a ls2 throttlebody mount to a ls6 intake manifold? and what is the highest HP you can get before you would need to swap out the ls6 intake manifold? thanks for the help.
Drifting
Joined: Jul 2001
Posts: 1,312
Likes: 2
From: Lake Havasu City AZ
Whats up? I bought my 99 c5 about a month ago, and my HP goals for this car are 450whp. I need some help figuring out what mods to get me there without going forced induced, and nitrous. Would a ls2 throttlebody mount to a ls6 intake manifold? and what is the highest HP you can get before you would need to swap out the ls6 intake manifold? thanks for the help.
Congrats on your new car. I hope I can help you reach your goal without wasting lots of money. Getting to 450 RWHP is expensive normally aspirated period! You have two problems in CA. One is emissions inspections that limit you to shorty headers and 91 octane gas which limits CR to about 11/1. Here is a senerio for N/A route.
AFR or equivlent heads with gaskets and ARP fasteners = close to $3K
Cam with new lifters /pushrods and rockers =$1K
Shorty headers with gaskets =1K
Underdrive pully with ARP bolt = $400
LS6 or better intake and new gaskets =$400 to $1200.
Tuning =$500
All prices are with out labor.
So your looking at about 6k minimum. You can buy an A&A S/C kit for about $4500 on special and have a real drivable car for less. I hope this helps. By the way the new heads should give you about 3 more MPG.
Mike V
Thread Starter
Burning Brakes
Joined: Jun 2008
Posts: 838
Likes: 5
From: San Diego CA
hmm thanks mike. how do the ls2 intake manifolds stack up to the ls1 intake? and are there any mods i would have to do to make the ls2 intake and ls2 throttlebody work on my ls1?
Drifting
Joined: Mar 2002
Posts: 1,298
Likes: 12
From: Salt Lake City UT
The LS2 intake and LS2 90mm throttle body will work. You will probably need to use a fairly stout cam to get 450RWHP out of a 346c.i. engine. By stout I mean something in neighborhood of a G5X3. The 205 AFR heads will really work well with this cam.
Pro
Joined: Oct 2005
Posts: 733
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From: Vanceboro NC
The LS2 intake is one of the worst LS intakes you can get. The LS6 is the better of the two and the stock TB will take you to your power level.
A set of properly ported 243 heads and a matching cam will take you to power level your looking for. The right 243's will out flow the AFR's and match the 3.899 bore better. If you spend the money on heads that are really efficient you can run less timing, less fuel, and a smaller cam than with the cheap heads that require more of the above. Which will make it easier for you to make power and pass emissions.
A set of properly ported 243 heads and a matching cam will take you to power level your looking for. The right 243's will out flow the AFR's and match the 3.899 bore better. If you spend the money on heads that are really efficient you can run less timing, less fuel, and a smaller cam than with the cheap heads that require more of the above. Which will make it easier for you to make power and pass emissions.
Safety Car
Joined: Jul 2005
Posts: 4,205
Likes: 2
From: Chicago-NW Burbs Illinois
you will need a pretty stout H/C package to get you there and all the bolt-ons. I noticed that you're from California so you probably won't be able to go too big on the cam (224/228 114lsa or so) because of smog. It can be done but you will need the right combo.
AFR 205's, 224/228 114, LT's, CAI, Underdrive pulley and a FAST 92 should get you there if not pretty close. Good luck!
AFR 205's, 224/228 114, LT's, CAI, Underdrive pulley and a FAST 92 should get you there if not pretty close. Good luck!
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Former Vendor
Joined: Feb 2007
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From: Birmingham, AL www.hinsonsupercars.com 205-909-9402
Whats up? I bought my 99 c5 about a month ago, and my HP goals for this car are 450whp. I need some help figuring out what mods to get me there without going forced induced, and nitrous. Would a ls2 throttlebody mount to a ls6 intake manifold? and what is the highest HP you can get before you would need to swap out the ls6 intake manifold? thanks for the help.
Advanced
Joined: Jan 2009
Posts: 55
Likes: 0
From: franklinton nc
The LS2 intake is one of the worst LS intakes you can get. The LS6 is the better of the two and the stock TB will take you to your power level.
A set of properly ported 243 heads and a matching cam will take you to power level your looking for. The right 243's will out flow the AFR's and match the 3.899 bore better. If you spend the money on heads that are really efficient you can run less timing, less fuel, and a smaller cam than with the cheap heads that require more of the above. Which will make it easier for you to make power and pass emissions.
A set of properly ported 243 heads and a matching cam will take you to power level your looking for. The right 243's will out flow the AFR's and match the 3.899 bore better. If you spend the money on heads that are really efficient you can run less timing, less fuel, and a smaller cam than with the cheap heads that require more of the above. Which will make it easier for you to make power and pass emissions.
What about the Jeggs High Performance december catalog that has the trick flow heads/cam packages for 500 and 515 HP? I personally was going to buy the 500 HP package for my stock 02 C-5
Thread Starter
Burning Brakes
Joined: Jun 2008
Posts: 838
Likes: 5
From: San Diego CA
ok thanks for the info guys. what about a set of stock zo6 heads with upgraded springs? those are a 243 casting correct? and yeah i live in california so i would need to be within smog standards unless i register it in my home state of colorado (Im in the Navy).
Thread Starter
Burning Brakes
Joined: Jun 2008
Posts: 838
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From: San Diego CA
Burning Brakes
Joined: Jan 2008
Posts: 1,033
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From: H-Town Texas
You will need to port the ls6 heads and YES they are 243's. More than likely you will also need a FAST 92 Intake Manifold, possibly a Vararam Intake (Good hp when you are moving), and shorty headers, x-pipe etc.
My suggestion for you would to go the FI route and either get an A&A supercharger, ECS supercharger, or Maggie. This will give you a very streetable car that will definitely reach your 450 rwhp mark and will be much cheaper than a H/C/I route.
My .02
My suggestion for you would to go the FI route and either get an A&A supercharger, ECS supercharger, or Maggie. This will give you a very streetable car that will definitely reach your 450 rwhp mark and will be much cheaper than a H/C/I route.
My .02
Le Mans Master
Joined: Mar 2005
Posts: 5,811
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From: Minnetonka MN
St. Jude Donor '06
tell us again why you do not want to go with a supercharger or twin turbo? a used blower from our for sale section will run you about 4-5K, plus install and tune, figure another 1K. you'll have a lot more power then a h/c bolt ons setup. you're not going to make 450 whp with h/c. if you do, its a heavy HEAVY build, which will probably run you up past 8K. at this point, your car will probably not pass CA inspection either and it will be a pain to drive on a daily basis.
your other option, buy a built 402 stroker motor. that'll get ya 450 easy!
i'd say go forced induction if u want to stay with the stock 346ci... do the research on it.
your other option, buy a built 402 stroker motor. that'll get ya 450 easy!
i'd say go forced induction if u want to stay with the stock 346ci... do the research on it.
Thread Starter
Burning Brakes
Joined: Jun 2008
Posts: 838
Likes: 5
From: San Diego CA
Im not against blowers at all just curious to see what it would take to get to 450 N/A. I had a SuperCharged cobalt so it wouldn't be new to me. I most likely will go that route. what supporting mods would be suggested/ mandatory for going with a blower. A and A is somewhat local too.
Advanced
Joined: Jan 2009
Posts: 55
Likes: 0
From: franklinton nc
No But in my catalog there are three part numbers if you go to summitracing.com (I thought it was jeggs) and type >
tfs-k306-485-460 ---485 hp
tfs-k306-500-460 ---500 hp
tfs-k306-515-460 ---515 hp
and you should find them...These are complete kits heads,gaskets,pushrods,camshaft,And rocker arms ---all matched!
ttyl good luck! ,chris
tfs-k306-485-460 ---485 hp
tfs-k306-500-460 ---500 hp
tfs-k306-515-460 ---515 hp
and you should find them...These are complete kits heads,gaskets,pushrods,camshaft,And rocker arms ---all matched!
ttyl good luck! ,chris
Pro
Joined: Oct 2005
Posts: 733
Likes: 0
From: Vanceboro NC
No But in my catalog there are three part numbers if you go to summitracing.com (I thought it was jeggs) and type >
tfs-k306-485-460 ---485 hp
tfs-k306-500-460 ---500 hp
tfs-k306-515-460 ---515 hp
and you should find them...These are complete kits heads,gaskets,pushrods,camshaft,And rocker arms ---all matched!
ttyl good luck! ,chris
tfs-k306-485-460 ---485 hp
tfs-k306-500-460 ---500 hp
tfs-k306-515-460 ---515 hp
and you should find them...These are complete kits heads,gaskets,pushrods,camshaft,And rocker arms ---all matched!
ttyl good luck! ,chris
Pro
Joined: Oct 2005
Posts: 733
Likes: 0
From: Vanceboro NC
The 243 H/C package will most likely out perform those kits. And they come with Ferara valves, Pac springs set up to match the cam. You can run your stock rockers with them, so no need to waste money on rockers. And we use custom 3/8" pushrods with all our H/C packages. The cams are custom spec'ed for each set up to match the car and the owners needs.
Race Director
Joined: Dec 2004
Posts: 13,760
Likes: 75
From: Haymarket VA
I had a nice H/C 90/90 setup on my 346. 230-236 112 +2 cam. You don't need a big cam to make good numbers. It's all about the combination of parts working together. My car made 460/425 and drivability was great.