2 Cutouts or 1 Cutout, yes AGAIN!!!
Thread Starter
!LS1 11 Second Club
Joined: Apr 2003
Posts: 7,133
Likes: 2
From: Miami
2 Cutouts or 1 Cutout, yes AGAIN!!! http://home.att.net/~carlos.ramirez1...ic_org_pub.jpg
I saw these and thought Hmmmmm....
They are custom offroad pipes with cutouts to replace the cats on SLP LT Header/ Y-Pipe setup.
Now, I've already put a single cutout in the 2.75" I-Pipe, but I'm thinking these puppies may work great as I will not get the bottleneck effect at the 3" Y-collector to 2.75" I-Pipe.
[And yes, I plan on upgrading the catback... so no "why don't you just upgrade the catback!" responses please]
So, the ol' question... 2 Cutouts (at the Y) vs. 1 Cutout (at the I). Which should work best? Any proven results? I think I read once that PSJ ran better with one.
I saw these and thought Hmmmmm....
They are custom offroad pipes with cutouts to replace the cats on SLP LT Header/ Y-Pipe setup.
Now, I've already put a single cutout in the 2.75" I-Pipe, but I'm thinking these puppies may work great as I will not get the bottleneck effect at the 3" Y-collector to 2.75" I-Pipe.
[And yes, I plan on upgrading the catback... so no "why don't you just upgrade the catback!" responses please]
So, the ol' question... 2 Cutouts (at the Y) vs. 1 Cutout (at the I). Which should work best? Any proven results? I think I read once that PSJ ran better with one.
Thread Starter
!LS1 11 Second Club
Joined: Apr 2003
Posts: 7,133
Likes: 2
From: Miami
Well, I'm thinking the 2.75" choke of the stock I-pipe is a factor. Plus, these offroad pipes could be incorporated into a future X-pipe true dual system.
What I wonder though is if the perpendicular flow is an issue, as the opening is at 90 degrees from the flow path, unlike the Flowtech style which shoots off at an angle.
What I wonder though is if the perpendicular flow is an issue, as the opening is at 90 degrees from the flow path, unlike the Flowtech style which shoots off at an angle.
Thread Starter
!LS1 11 Second Club
Joined: Apr 2003
Posts: 7,133
Likes: 2
From: Miami
Generally, a single cutout in the I is my preference also, but in my case (due to the 2.75" I), I think I can benefit from 2 in the 3" Y (though I don't know if the Y-collector provides beneficial scavanging).
Anyone have any comments regarding the design of these cutouts?
Also note; I'm gaining 23HP with open cutout, so this cam loves to breathe.
Anyone have any comments regarding the design of these cutouts?
Also note; I'm gaining 23HP with open cutout, so this cam loves to breathe.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
!LS1 11 Second Club
Joined: Apr 2003
Posts: 7,133
Likes: 2
From: Miami
Originally Posted by Tally TransAm
id do dual cutouts
but i think those would sound like a huge exhuast leak rather than cutouts
the flow would probably go right past the opening
but i think those would sound like a huge exhuast leak rather than cutouts
the flow would probably go right past the opening
Yeah, the 90 degree angle can't be good.
I could probably achieve the same results with 2 rust holes.
The compactness of the design woulda been nice.
Thread Starter
!LS1 11 Second Club
Joined: Apr 2003
Posts: 7,133
Likes: 2
From: Miami
Originally Posted by BigPlanTransAm
if i was going to upgrade the catback anyway i would just wait till i upgraded it and put one in the I to increase the scavenging effect
Ah, yes, this would be the rational thing to do.
-or-
3" True duals, X.
We have some results for you guys. This is on Pauls WS6. Untouched motor. Mods are:
Lid/Filter
Ported TB
QTP Headers
QTP Dual QTEC Y Pipe
QTEC in I Pipe
This was on Carteks Dyno
1 Cutout Open
339.7hp/355.1TQ
2 Cutouts Open
345HP/358.4TQ
I have to scan the dyno sheet in but there is NO loss of torque down low or anywhere else. Gains across the board.
I have to get my car on the dyno to see how heads/cam car reacts to 1vs2
Lid/Filter
Ported TB
QTP Headers
QTP Dual QTEC Y Pipe
QTEC in I Pipe
This was on Carteks Dyno
1 Cutout Open
339.7hp/355.1TQ
2 Cutouts Open
345HP/358.4TQ
I have to scan the dyno sheet in but there is NO loss of torque down low or anywhere else. Gains across the board.
I have to get my car on the dyno to see how heads/cam car reacts to 1vs2
