anyone lose power with 3" duals
anyone lose power with 3" duals last week i posted a thread asking if my 4" header back setup was costing me power and someone posted a graph showing 3" duals flow more than a single 4" and another person claims to have gained almost 40hp going down from a 4" to 3".
so my question is; has anyone lost power going to a 3" duals setup? and again i ask that because on the graph posted it showed more cfm from 3" duals than a singlr 4".
so my question is; has anyone lost power going to a 3" duals setup? and again i ask that because on the graph posted it showed more cfm from 3" duals than a singlr 4".
last week i posted a thread asking if my 4" header back setup was costing me power and someone posted a graph showing 3" duals flow more than a single 4" and another person claims to have gained almost 40hp going down from a 4" to 3".
so my question is; has anyone lost power going to a 3" duals setup? and again i ask that because on the graph posted it showed more cfm from 3" duals than a singlr 4".
so my question is; has anyone lost power going to a 3" duals setup? and again i ask that because on the graph posted it showed more cfm from 3" duals than a singlr 4".
If you want duals (Which I don't think are necessary till your north of 420 RWHP), I'd go with 2-1/2".
Re'
Tech Resident
Joined: Jan 2006
Posts: 5,117
Likes: 3
From: Philly
I want to modify this statement.
You gain power through WELL-MADE true duals. It's hard to make true duals for F-body's, and if you slap together some crap, a y-pipe setup will outperform it.
In most cases, power is gained by switching to true duals because of scavenging, not because of flow. Chances are, your y-pipe setup flows well enough. Adding more flow won't help in this case. True duals help because a good H or X merge can outperform a Y-merge. You have to realize a few things:
1.) If you don't have a merge in your true duals, you're likely better off with a y-pipe setup.
2.) If your H or X merge is made like crap and just slapped together, it may hurt you more than help you.
There surely are some people out there that lost power going from a y-pipe setup to TD's, but it's because their TD's were crafted poorly. If you want to go TD's, make sure you have it made well. Mandrel bends, minimal bends, a GOOD merge (the most important part)...these are the things you want to make your money on TD's well-spent.
You gain power through WELL-MADE true duals. It's hard to make true duals for F-body's, and if you slap together some crap, a y-pipe setup will outperform it.
In most cases, power is gained by switching to true duals because of scavenging, not because of flow. Chances are, your y-pipe setup flows well enough. Adding more flow won't help in this case. True duals help because a good H or X merge can outperform a Y-merge. You have to realize a few things:
1.) If you don't have a merge in your true duals, you're likely better off with a y-pipe setup.
2.) If your H or X merge is made like crap and just slapped together, it may hurt you more than help you.
There surely are some people out there that lost power going from a y-pipe setup to TD's, but it's because their TD's were crafted poorly. If you want to go TD's, make sure you have it made well. Mandrel bends, minimal bends, a GOOD merge (the most important part)...these are the things you want to make your money on TD's well-spent.
i had 3 1/2in td's on my bolt on ls1 last year and she picked up a good amount of power, i bought the setup dirt cheap, broke 12's with bolt ons, this year im going to 3in td's because i lowered the car both will have an X pipe
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the reason i asked this question is because i have a 4" header back setup and a graph was posted on a thread i started last week showing 3" duals flow more than a single 4" and was wondering if i was losing power going with such a big 4" exhaust.
if 3" duals flow more cfm than a single 4" would that also mean that the 3" dual setup would have equal and/or less back-pressure than the 4"single exhaust?
if you were going to lose power with a 4" single setup would you also expect to lose power with the 3" duals since the dual setup flows more cfm than the 4"?
if 3" duals flow more cfm than a single 4" would that also mean that the 3" dual setup would have equal and/or less back-pressure than the 4"single exhaust?
if you were going to lose power with a 4" single setup would you also expect to lose power with the 3" duals since the dual setup flows more cfm than the 4"?
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i lost 1rwhp going from LT's/ORY and SLP LM catback system to TSP TD's...
however i gained 6rwtq by going to TD's...
LT/ORY/SPL LM setup...
LT/TSP TD's w/dual SLP LM resonators...
however i gained 6rwtq by going to TD's...
LT/ORY/SPL LM setup...
LT/TSP TD's w/dual SLP LM resonators...
You will not lose much.. but for to the fact that you will change your power band... and the HP or TQ will move to a different range. More than likely, it has now moved higher in the RPM Range with the larger pipes.
So, the Seat of the pants Dyno will say you lose HP/TQ if you are driving in the lower RPM Range and many not even notice much at WOT.
My 2 cents..
So, the Seat of the pants Dyno will say you lose HP/TQ if you are driving in the lower RPM Range and many not even notice much at WOT.
My 2 cents..
Thanks for that info!!! I have a Dyno mouth and often wondered what it would gain(or lost in this case) if I went with duals
Tech Resident
Joined: Jan 2006
Posts: 5,117
Likes: 3
From: Philly
Keep in mind that the TSP TD's don't have a great X-merge either, and they still gained over the highest flowing catback on the market. If you get TD's made with a very good X-merge, you will pick up even more.