Intake advise
Thread Starter
Heel & Toe
Joined: Dec 2014
Posts: 15
Likes: 0
Intake advise
I have a 98 C5 with a poor tune on it and was wondering if I could get advise on what to do as I go for a new tune. Its a good time to make sure everything is matched.
Looking for 500 HP loosly (maybe 440 at wheels) and I have a ported LS6 intake, Texas speed 2.5 heads, tick torquemax stage 2 cam, LG 1 3/4 ceramic long headers, hight flow cats, corsa exhaust, stock bottom end. Since I have a stock MAF and stock throttle body would I gain enough by just porting these or should I look at an LS2 intake, MAF and Throttle body? Ported TB and ls6 MAF? trying to not go to the FAST stuff cause of the price but maybe that's the answer if its really the bottleneck??
Right now the dual wideband shows about 14.1 from idle up to half throttle (closed loop I believe) then as soon as I go over half it drops to 10.3 or a little above. seems to stay in 10's most of the way up RPM's.. I should be shooting for about 12.5 right?
Thanks for any input! Happy New Year!
Looking for 500 HP loosly (maybe 440 at wheels) and I have a ported LS6 intake, Texas speed 2.5 heads, tick torquemax stage 2 cam, LG 1 3/4 ceramic long headers, hight flow cats, corsa exhaust, stock bottom end. Since I have a stock MAF and stock throttle body would I gain enough by just porting these or should I look at an LS2 intake, MAF and Throttle body? Ported TB and ls6 MAF? trying to not go to the FAST stuff cause of the price but maybe that's the answer if its really the bottleneck??
Right now the dual wideband shows about 14.1 from idle up to half throttle (closed loop I believe) then as soon as I go over half it drops to 10.3 or a little above. seems to stay in 10's most of the way up RPM's.. I should be shooting for about 12.5 right?
Thanks for any input! Happy New Year!
Last edited by motoman250f; Jan 1, 2015 at 03:36 AM.
Drifting
Joined: Oct 2006
Posts: 1,724
Likes: 23
From: Minnesota
500whp is hard to hit on just the motor. Do a search, there are a few guys on here who have done it. The FAST will outperform the LS6 no doubt. 12.5ish is a good target for an NA build.
My advice, drop a supercharger on the thing. Way easier to hit 500whp that way.
BTW. I'm running a '98 with heads/cam/intake/TB/Headers/supercharger/etc. and I'm probably at 550-575 whp. 500 on the motor will be hard to obtain.
My advice, drop a supercharger on the thing. Way easier to hit 500whp that way.
BTW. I'm running a '98 with heads/cam/intake/TB/Headers/supercharger/etc. and I'm probably at 550-575 whp. 500 on the motor will be hard to obtain.
Pro
Joined: Mar 2007
Posts: 600
Likes: 11
From: Wilmington NC
I'm pushing the numbers you're looking for, check out the signature for mods. Keep in mind that I have an automatic with 3.73 rear and a 4000 stall TC. Those all decrease the HP at the wheels but make for a quicker car. I can roast my 345's at a 50MPH roll... it's sickening!
Thread Starter
Heel & Toe
Joined: Dec 2014
Posts: 15
Likes: 0
aftrbrnr, you seem happy right at that amount of hp? You wont be going up? Seems like everyone is saying if you have 500 you will just want 600. That's plenty more CI in a Ls2,, sounds like a nice setup!
Pro
Joined: Mar 2007
Posts: 600
Likes: 11
From: Wilmington NC
Honestly more hp is a waste at this point. There is nowhere that I can use more than 50% throttle legally. This car is wicked fast accelerating and I can't hook up in a launch at greater than part throttle. The sound is fantastic. She sounds fast for sure and shakes the house sitting outside idling. I have had this car for over ten years now and I am quite happy with it; I never get bored with its performance.
Drifting
Joined: Oct 2006
Posts: 1,724
Likes: 23
From: Minnesota
I can roast my 345s on a 50mph roll as well. Car still feels slow to me. Enough is never enough. Maybe at around 1000 that would be enough, but I imagine people at 1000 say 1500 would be enough. It never stops.
Drifting
Joined: Oct 2006
Posts: 1,724
Likes: 23
From: Minnesota
The only way he's going up significantly is with NOS or FI. There's not much more he can do to that motor.
Thread Starter
Heel & Toe
Joined: Dec 2014
Posts: 15
Likes: 0
Yeah but what do you have to do to your rear end and cv's to handle the power? I'd do a blower if I thought I wouldn't have bottom end problems or rear end problems. what are you doing to strengthen things up?
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Burning Brakes
Joined: Feb 2003
Posts: 1,144
Likes: 18
From: Panhandle FL
OK, just saying "I'M THE ONLY GUY THAT READ YOUR POST" ! You have everything you need to hit 440ish RWHP ! Your tune is way off. You need a dyno tune from somebody with LS experience. If they know their stuff they can get you within 5 hp of your goal on a dynojet dyno. Just saying.........................
Pro
Joined: Mar 2007
Posts: 600
Likes: 11
From: Wilmington NC
Unless you do hard launches on sticky tires you won't need to upgrade to hardened output shafts. The C5 CV axles are better and thicker than C6 so you're fine there for a large power range.