Is Bigger always Better??
Is Bigger always Better?? Here soon.. I will be trying to squeeze every hp outta my setup to achieve a goal. Currently I'm Running 1 3/4 SLP Long tubes with ORYP and 3" Exhaust through a cutout.. What gains if any would I see going to a 1 7/8 Headers??? True Duals?? 4" exhaust??
Thanks,
Justin
Thanks,
Justin
In short, if your engine isn't bigger, even if it flows better, bigger can be bad for performance. If you go too big (like heads and cam) you're gonna have an engine with NO bottom end power and that'll probably fall on it's face part way down the track even with good tuning. 1 7/8ths is considered overkill and will, in most cases, loose low end power for minimal top-end gains (if you've got a 408 stroker or bigger, go for it, if not - I'd stick with the 1 3/4 or go for some stepped headers. If 3" is about the limit I'd put on exhaust pipes on even fairly heavily modded LS1's. No catback can outflow a cutout but IMHO, I like true duals - they sound great and flow amazingly well - only drawback is ground clearance (you'll loose some with a cutout too depending on where you put it). Anyone feel free to 'take me to school' if I've said anything false 
. Good luck making more power.
. Good luck making more power.
Originally Posted by 300bhp/ton
What setup?
And why every HP, because I bet there are a ton of other things which you could do also.
And why every HP, because I bet there are a ton of other things which you could do also.
Launching!
Joined: Aug 2005
Posts: 227
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From: Burlington, NC
Anyone feel free to 'take me to school' if I've said anything false. Well GTObsessor. I'm taking you to school. I have true duals on my car that goes over the axle and exits out the rear from beneath the bumper in the stock location and I have MORE ground clearance with the duals than I had with that stupid, power robbing "Y" pipe system. I have no idea where all you guys get the idea that dual exhaust has a ground clearance problem. If the system is designed properly, there is no ground clearance problem. (I designed my own system and had a muffler shop friend built it for my car.) It was designed to look like a factory system. Yes, I used the stock manifolds and I left the cats. in their stock location. So, I have the performance gains of a dual exhaust system, (about a 5 percent (15 horses) horsepower gain over that stupid 'Y' pipe system), better ground clearance, A system that is street legal in all 50 states and it all looks stock. What more could one ask for.
Last edited by JEB Garner; Dec 3, 2005 at 12:01 AM.
You can't over exhaust an LS1.. Sure going with a bigger setup you will lose some down low but you gain it back up top and some through the curve. I think most of us spend most of the time in the upper RPM range when we race.
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TECH Addict
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From: England
Originally Posted by 01 Red WS6
You can't over exhaust an LS1.. Sure going with a bigger setup you will lose some down low but you gain it back up top and some through the curve. I think most of us spend most of the time in the upper RPM range when we race.
As for high rpm's, well if you're exhaust is performing best at 6800-9000rpm it's pretty usless on a LS1
Last edited by WILWAXU; Dec 7, 2005 at 08:55 PM.
Originally Posted by JEB Garner
I designed my own system and had a muffler shop friend built it for my car.) It was designed to look like a factory system. Yes, I used the stock manifolds and I left the cats. in their stock location. So, I have the performance gains of a dual exhaust system, (about a 5 percent (15 horses) horsepower gain over that stupid 'Y' pipe system), better ground clearance, A system that is street legal in all 50 states and it all looks stock. What more could one ask for.
Originally Posted by Griswold
if you are trying to get all the horsepower out of your setup you should seriously consider getting rid of those slp headers.
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From: England
Originally Posted by JEB Garner
Anyone feel free to 'take me to school' if I've said anything false. Well GTObsessor. I'm taking you to school. I have true duals on my car that goes over the axle and exits out the rear from beneath the bumper in the stock location and I have MORE ground clearance with the duals than I had with that stupid, power robbing "Y" pipe system. I have no idea where all you guys get the idea that dual exhaust has a ground clearance problem. If the system is designed properly, there is no ground clearance problem. (I designed my own system and had a muffler shop friend built it for my car.) It was designed to look like a factory system. Yes, I used the stock manifolds and I left the cats. in their stock location. So, I have the performance gains of a dual exhaust system, (about a 5 percent (15 horses) horsepower gain over that stupid 'Y' pipe system), better ground clearance, A system that is street legal in all 50 states and it all looks stock. What more could one ask for.
BUT a well designed Y pipe cat back will have offered the same gain.
And no way is a cat back going to give you 15bhp without doing some thing with the headers and CATS. There is such a thing as flow rate?
If you want to know more about it have a look at the sticky about exhausts/mods
BTW - duals are not always better.
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From: England
Originally Posted by CRL 01 SS
Why is that? SLP longtube headers flow just as well, maybe better, than any other 1 3/4" header made for an LS1, except for maybe Kooks. Even switching to Kooks there won't be much of a gain.
And why are Kooks so good? There are many many other manufactures out there which offer similar headers.
Is this mearly the fact that you yourself have SLP headers and like to try and prove they are as good??
I'm not saying SLP headers arn't any good, but they are however:
-expensive
-do have clearance issues (proven)
-have also seen and heard of claims of making more power with alternative headers in direct comparison on rolling road dyno's.
Originally Posted by 300bhp/ton
Can you prove any of your claims, or are you just basing it on here say?
And why are Kooks so good? There are many many other manufactures out there which offer similar headers.
Is this mearly the fact that you yourself have SLP headers and like to try and prove they are as good??
I'm not saying SLP headers arn't any good, but they are however:
-expensive
-do have clearance issues (proven)
-have also seen and heard of claims of making more power with alternative headers in direct comparison on rolling road dyno's.
And why are Kooks so good? There are many many other manufactures out there which offer similar headers.
Is this mearly the fact that you yourself have SLP headers and like to try and prove they are as good??
I'm not saying SLP headers arn't any good, but they are however:
-expensive
-do have clearance issues (proven)
-have also seen and heard of claims of making more power with alternative headers in direct comparison on rolling road dyno's.
Last edited by CRL 01 SS; Dec 3, 2005 at 03:13 PM.
Originally Posted by JEB Garner
Anyone feel free to 'take me to school' if I've said anything false. Well GTObsessor. I'm taking you to school. I have true duals on my car that goes over the axle and exits out the rear from beneath the bumper in the stock location and I have MORE ground clearance with the duals than I had with that stupid, power robbing "Y" pipe system. I have no idea where all you guys get the idea that dual exhaust has a ground clearance problem. If the system is designed properly, there is no ground clearance problem. (I designed my own system and had a muffler shop friend built it for my car.) It was designed to look like a factory system. Yes, I used the stock manifolds and I left the cats. in their stock location. So, I have the performance gains of a dual exhaust system, (about a 5 percent (15 horses) horsepower gain over that stupid 'Y' pipe system), better ground clearance, A system that is street legal in all 50 states and it all looks stock. What more could one ask for.
I didn't intend to start the slp vs. the world debate with my comment. I have seen a lot of people pick up power switching from slp to another 1 3/4 header. Do a search and I'm sure you will see what I mean. Not to mention the ground clearance is a lot better with other headers.
For this particular application, if he has afr 205's, g5x3, ported 90/90, pulley, ewp, etc.....I would be willing to bet money he would pick up power all over the place switching to another header. Just my opinion of course.
For this particular application, if he has afr 205's, g5x3, ported 90/90, pulley, ewp, etc.....I would be willing to bet money he would pick up power all over the place switching to another header. Just my opinion of course.