Adding cam-- later add headers....
Thread Starter
Drifting
Joined: Mar 2000
Posts: 1,477
Likes: 105
From: st. louis, MO. USA
Adding cam-- later add headers....
Ok guys-- All this talk about swapping cams got me fired up and I bought one and am having it installed this week. Then Im having my car dyno-tuned 2 weeks later. I know its optimal to have LT headers with the cam but money is tight with cam, springs, pushrods, install, and tuning. So heres my question. Once I have the cam installed and the car dyno-tuned, If I add some Long-tube headers later, am I gonna have to have it tuned again??? Will the LT headers disrupt my previous LS-1 edit enough to where I should have it tuned a second time??--- I hope not (more and more money)
Thanks
Rob
Thanks
Rob
Thread Starter
Drifting
Joined: Mar 2000
Posts: 1,477
Likes: 105
From: st. louis, MO. USA
Re: Adding cam-- later add headers.... (1999PewterCorvette)
BTW, I want to personally thank the forum for helping me choose my cam and giving me good info. I really would never have attempted a mod of this nature had it not been for all of you guys and sharing your knowledge and experiences. thanks again :seeya :seeya
Drifting
Joined: May 2002
Posts: 1,607
Likes: 1
From: San Francisco CA
Re: Adding cam-- later add headers.... (1999PewterCorvette)
Adding the headers will probably lean it out a bit. How much I cannot really say. In any event I do not think it would make it dangerously lean. What you could do is to put it on the dyno that has a wideband O2, after you install the headers, and see what the air fuel ratio is and decide from there. Another option is to have it tuned a bit rich, say 12.7:1 and then when you install the headers you should be about right if the headers do indeed make it run a bit leaner.
Perhaps a call to Andy at A&A or maybe FLP or whatever tuner is familiar with the headers you will be installing would be a good idea, as they are more familiar with how the headers will affect the fuel mixture.
Perhaps a call to Andy at A&A or maybe FLP or whatever tuner is familiar with the headers you will be installing would be a good idea, as they are more familiar with how the headers will affect the fuel mixture.
Burning Brakes
Joined: May 2003
Posts: 1,058
Likes: 0
From: Roswell New Mexico
St. Jude Donor '07-'08
Re: Adding cam-- later add headers.... (SFVetteman)
Nope, you won't have to retune, it is probably optimal to retune a little, but at most i see the gains being less than 5hp with the 2nd tune. I did my cam first and tuned the car, then added headers later, and the only the car needed was more room to run!!! Ran excellent with no second tune. :steering:
Thread Starter
Drifting
Joined: Mar 2000
Posts: 1,477
Likes: 105
From: st. louis, MO. USA
Re: Adding cam-- later add headers.... (Mr. Big)
Thanks Mr. Big, thats what I wanted to hear.!! I know I wouldnt gain much in hp from a 2nd tune, I just didnt want to hurt the car by not tuning if I added headers later. Like mentioned above, I dont think it would change the car so much as to need a re-tune, maybe just lean it out a bit
So what kind of numbers did you see after the cam and tune and then after the addition of the headers???
Thanks, Rob
So what kind of numbers did you see after the cam and tune and then after the addition of the headers???
Thanks, Rob
Thread Starter
Drifting
Joined: Mar 2000
Posts: 1,477
Likes: 105
From: st. louis, MO. USA
Re: Adding cam-- later add headers.... (1999PewterCorvette)
Any guesses on what my horsepower will be BEFORE I add any headers to my car. ? Just have an MN6 with twin-flow air intake, mallett carbon fiber exhaust, Lunati 221 .558 cam and getting a dyno-tune with LS-1 edit. Anybody know any numbers I will be looking at???
Thanks
Rob
Thanks
Rob
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Le Mans Master
Joined: Jan 2003
Posts: 6,298
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From: Tyler TX
Re: Adding cam-- later add headers.... (1999PewterCorvette)
That's not true in all cases.
:skep: If you have it tuned with LS1 Edit" most tuners don't charge extra for retune. Different Headers can make much more than 5 hp gains over others. I would fine out from the tuner if he charges for upgrade tuning and if he does I would find one that don't. :yesnod: :thumbs:
Thanks Mr. Big, thats what I wanted to hear.!! I know I wouldnt gain much in hp from a 2nd tune, I just didnt want to hurt the car by not tuning if I added headers later. Like mentioned above, I dont think it would change the car so much as to need a re-tune, maybe just lean it out a bit
So what kind of numbers did you see after the cam and tune and then after the addition of the headers???
Thanks, Rob
So what kind of numbers did you see after the cam and tune and then after the addition of the headers???
Thanks, Rob
Melting Slicks
Joined: Aug 1999
Posts: 3,452
Likes: 3
From: Spring, TX
Re: Adding cam-- later add headers.... (1999PewterCorvette)
With the air intake and exhaust you are probably just over 300 rwhp now. So I would figure about 340-350 with the cam.
I adding a larger cam and pretty much have the same mods as you intake and exhaust and a friend of mine added a similiar cam with headers and cats and got 400 rwhp. I am hoping for about 365-375 with the stock manifolds and cats.
I adding a larger cam and pretty much have the same mods as you intake and exhaust and a friend of mine added a similiar cam with headers and cats and got 400 rwhp. I am hoping for about 365-375 with the stock manifolds and cats.
Thread Starter
Drifting
Joined: Mar 2000
Posts: 1,477
Likes: 105
From: st. louis, MO. USA
Re: Adding cam-- later add headers.... (gonbad)
Im hoping to make 345 rwp with those mods.-- That will put me at 400-405 hp at the flywheel and thats my goal. Wanted to be close to the 02-04 Z06's.
Then later add some headers and I think I will be done. But thats never the case is it?? Who knew you could dump so much money on such a "ready to race" car right from the factory?
Rob
Then later add some headers and I think I will be done. But thats never the case is it?? Who knew you could dump so much money on such a "ready to race" car right from the factory?
Rob
Racer
Joined: Sep 2002
Posts: 424
Likes: 0
From: Va, Beach VA
Re: Adding cam-- later add headers.... (1999PewterCorvette)
Im hoping to make 345 rwp with those mods.-- That will put me at 400-405 hp at the flywheel and thats my goal. Wanted to be close to the 02-04 Z06's.
Then later add some headers and I think I will be done. But thats never the case is it?? Who knew you could dump so much money on such a "ready to race" car right from the factory?
I have the same goals in mine.Hope you reach them.I did headers(kooks) first and doing cam next prabably the same cam as you.Do'nt forget to post results and a sound clip(I hear this is a mild cam) .And anybody that knows the specs. on the "stealth" cam and it's street manners chime in.
Rob
Then later add some headers and I think I will be done. But thats never the case is it?? Who knew you could dump so much money on such a "ready to race" car right from the factory?
I have the same goals in mine.Hope you reach them.I did headers(kooks) first and doing cam next prabably the same cam as you.Do'nt forget to post results and a sound clip(I hear this is a mild cam) .And anybody that knows the specs. on the "stealth" cam and it's street manners chime in.
Rob
Burning Brakes
Joined: May 2003
Posts: 1,058
Likes: 0
From: Roswell New Mexico
St. Jude Donor '07-'08
Re: Adding cam-- later add headers.... (Rays Vet)
Well i did dyno the car after the cam, this was with completely stock exhaust and ls1 intake, the only other mod i had was the blackwing. I had a 224/230 .561 .579 112 cam in the car, and she put down 341rwhp, after i added the full exhaust with tpis headers,x pipe and the ls6 intake, she hit the 380 range to the wheels.
I even did some wot runs and there was nothing to really tune, everything ran fine, i had access to tune again right away, just didn't need it. Big difference after the headers :smash:
[Modified by Mr. Big, 10:11 PM 4/11/2004]
I even did some wot runs and there was nothing to really tune, everything ran fine, i had access to tune again right away, just didn't need it. Big difference after the headers :smash:
[Modified by Mr. Big, 10:11 PM 4/11/2004]
Drifting
Joined: Jul 2003
Posts: 1,796
Likes: 1
From: Annandale VA
Re: Adding cam-- later add headers.... (1999PewterCorvette)
In my experience, a 221 duration cam is not going to get you 45 HP w/ stock heads. It will be more like 30 HP. Also, the straight pattern grind will benefit more from the addition of LT headers than a split-duration grind. Every car is different though.
Most guys install headers at the same time as their cam to keep their install costs down.
Most guys install headers at the same time as their cam to keep their install costs down.
Drifting
Joined: Oct 2002
Posts: 1,335
Likes: 76
From: Bedford Va.
Re: Adding cam-- later add headers.... (HITMAN99)
I just had my car tuned, 375rwhp & 382rwhp on a back to back run.
the higher number was after some cool down time. I have stock exhaust manifolds and cats with z06 cat-back. torque was low at 338rwq.
the straight pattern cam really needs the headers. I will be changing this setup. I asked about retuning after the header install, they said it would be minor. see profile for details
the higher number was after some cool down time. I have stock exhaust manifolds and cats with z06 cat-back. torque was low at 338rwq.
the straight pattern cam really needs the headers. I will be changing this setup. I asked about retuning after the header install, they said it would be minor. see profile for details
