UPDATE: Mamofied sbe 346 ls1 - 446rwhp to 470rwhp SAE with exhaust upgrade
05-20-2016, 05:16 PM
#21
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That was why I asked about race weight. Also, as even the OP has agreed, there is power left in the exhaust. The exhaust ports on these Mamo heads are the best, but the rest of the exhaust can choke them much more easily.
Even if the OP "only" gains 15 from his planned exhaust upgrades, that's a 470/420 combo. And if there is any way to talk him into a lighter clutch for another 10-15.....
Even if the OP "only" gains 15 from his planned exhaust upgrades, that's a 470/420 combo. And if there is any way to talk him into a lighter clutch for another 10-15.....
Wondering how they would compare to my monster level 2
05-20-2016, 06:04 PM
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The RPS has more gripping power, and is lighter, so it makes the throttle response much snappier. Left leg effort is reduced as well. The RPS is rebuildable for like $400, so you'll never need to buy another clutch in theory
If you go RPS, definitely go through Tony, because he lightens up the flywheel on the outside, reducing MOI, which for the same price is well worth doing.
If you're feeling really ballsy, check out some of the super light options like the tilton 5.5. 19 pounds, and almost all the weight is less than 3" from center. There are guys posting that is worth 20-25 HP vs the stock or stock weight clutches. I'm positive I gained at least 10 from the lighter clutch.
Last edited by Darth_V8r; 05-20-2016 at 06:05 PM. Reason: added rebuildable comment
05-21-2016, 12:44 PM
#24
That was why I asked about race weight. Also, as even the OP has agreed, there is power left in the exhaust. The exhaust ports on these Mamo heads are the best, but the rest of the exhaust can choke them much more easily.
Even if the OP "only" gains 15 from his planned exhaust upgrades, that's a 470/420 combo. And if there is any way to talk him into a lighter clutch for another 10-15.....
Even if the OP "only" gains 15 from his planned exhaust upgrades, that's a 470/420 combo. And if there is any way to talk him into a lighter clutch for another 10-15.....
04-07-2017, 10:35 PM
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Updated numbers 470rwhp/411rwtq SAE Hey guys, happy to report some stronger numbers out of this combo 
I upsized my exhaust....
Old: ARH 1-3/4" x 3" LT's & 3" catted Y-pipe with 3" outlet -> 3" catback and cutout
New: ARH 1-7/8" x 3" LT's & 3" catted Y-pipe with 4" outlet -> open for now, but will go into 4" cutout pipe, then reduced down to stock SLP 3" CME catback
Here's a couple pics for comparison:
As you can see, the 4" outlet is substantially larger than the standard 3" outlet (I measured 2.62" ID vs 3.80" ID)
ARH does awesome work merging the two 3" pipes and incorporates a HVMC before opening to 4" OD...
Here's a dyno vid while tuning adjustments were underway:
Only minor fuel adjustments were made
Again, just running the open 4" outlet here until I can get parts together and get to my exhaust guy to finish it off...
Needless to say, it was loud! Probably the loudest sound I've ever heard out of anything...only got one video because the rest of the pulls, I was covering my ears lol
Literally gave me a headache driving to and from the shop
Final numbers were 470rwhp/411rwtq SAE (475rwhp uncorrected)
this is through a Monster level 2 single setup (47 LBS), stock 10-bolt and 3.90 gears
Car is stronger everywhere...
So this simple bolt-on change proved to be very effective, as commonly found...@ +24 rwhp, I'm very happy I did it
Will try to get to the track to see a mph gain, while the stock 10-bolt is still in there
Other mods still to come that will free up or eat some power:
Mamo RPS BC2 twin disc (+~10-15whp)
Strange S60 w/4.10s & S-trac (-~10-20whp)
3.5" PST alum driveshaft
RPM level VI T56 magnum
N20 plate kit (+/- 150whp
)
Again, props to Tony Mamo for an awesome, strong running combo and to Champion Motors for tuning
I upsized my exhaust....
Old: ARH 1-3/4" x 3" LT's & 3" catted Y-pipe with 3" outlet -> 3" catback and cutout
New: ARH 1-7/8" x 3" LT's & 3" catted Y-pipe with 4" outlet -> open for now, but will go into 4" cutout pipe, then reduced down to stock SLP 3" CME catback
Here's a couple pics for comparison:
As you can see, the 4" outlet is substantially larger than the standard 3" outlet (I measured 2.62" ID vs 3.80" ID)
ARH does awesome work merging the two 3" pipes and incorporates a HVMC before opening to 4" OD...
Here's a dyno vid while tuning adjustments were underway:
Only minor fuel adjustments were made
Again, just running the open 4" outlet here until I can get parts together and get to my exhaust guy to finish it off...
Needless to say, it was loud! Probably the loudest sound I've ever heard out of anything...only got one video because the rest of the pulls, I was covering my ears lol
Literally gave me a headache driving to and from the shop
Final numbers were 470rwhp/411rwtq SAE (475rwhp uncorrected)
this is through a Monster level 2 single setup (47 LBS), stock 10-bolt and 3.90 gears
Car is stronger everywhere...
So this simple bolt-on change proved to be very effective, as commonly found...@ +24 rwhp, I'm very happy I did it
Will try to get to the track to see a mph gain, while the stock 10-bolt is still in there
Other mods still to come that will free up or eat some power:
Mamo RPS BC2 twin disc (+~10-15whp)
Strange S60 w/4.10s & S-trac (-~10-20whp)
3.5" PST alum driveshaft
RPM level VI T56 magnum
N20 plate kit (+/- 150whp
)Again, props to Tony Mamo for an awesome, strong running combo and to Champion Motors for tuning
Last edited by manzo81maro; 04-09-2017 at 09:31 AM.
04-07-2017, 10:59 PM
#27
The S60 will eat about 20/25...
An x-pipe would pick up more torque vs a Y-Pipe. But you're no longer seeing the 3" restriction. A 4" pipe simply flows more before you get into back pressure issues.
And that's always been the issue with these cars. A single 3" exhaust or cutout is not remotely close to enough exhaust with any level of mods.
An x-pipe would pick up more torque vs a Y-Pipe. But you're no longer seeing the 3" restriction. A 4" pipe simply flows more before you get into back pressure issues.
And that's always been the issue with these cars. A single 3" exhaust or cutout is not remotely close to enough exhaust with any level of mods.
04-07-2017, 11:51 PM
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The S60 will eat about 20/25...
An x-pipe would pick up more torque vs a Y-Pipe. But you're no longer seeing the 3" restriction. A 4" pipe simply flows more before you get into back pressure issues.
And that's always been the issue with these cars. A single 3" exhaust or cutout is not remotely close to enough exhaust with any level of mods.
An x-pipe would pick up more torque vs a Y-Pipe. But you're no longer seeing the 3" restriction. A 4" pipe simply flows more before you get into back pressure issues.
And that's always been the issue with these cars. A single 3" exhaust or cutout is not remotely close to enough exhaust with any level of mods.
Heard the S60 takes a bit to turn, but RPS twin should offset that some
04-08-2017, 12:30 AM
#29
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The S60 will eat about 20/25...
An x-pipe would pick up more torque vs a Y-Pipe. But you're no longer seeing the 3" restriction. A 4" pipe simply flows more before you get into back pressure issues.
And that's always been the issue with these cars. A single 3" exhaust or cutout is not remotely close to enough exhaust with any level of mods.
An x-pipe would pick up more torque vs a Y-Pipe. But you're no longer seeing the 3" restriction. A 4" pipe simply flows more before you get into back pressure issues.
And that's always been the issue with these cars. A single 3" exhaust or cutout is not remotely close to enough exhaust with any level of mods.
Nice job OP.
04-08-2017, 09:56 PM
#31
Nice!
Big gains from the exhaust improvements (which is one of the reasons FBodies never usually dyno as high as there Corvette brethren which has a much better chassis layout for an effective 3" dual exhaust with an X-pipe).
Alex has a solid foundation.....getting the bigger numbers is always related to the attention to detail in the rest of the build!
Cheers,
Tony
Big gains from the exhaust improvements (which is one of the reasons FBodies never usually dyno as high as there Corvette brethren which has a much better chassis layout for an effective 3" dual exhaust with an X-pipe).
Alex has a solid foundation.....getting the bigger numbers is always related to the attention to detail in the rest of the build!
Cheers,
Tony
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www.mamomotorsports.com
Tony@MamoMotorsports.com
Anything worth doing is worth doing well. Build it right the first time....its alot cheaper than building it twice!!
04-09-2017, 09:58 AM
#32
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Nice!
Big gains from the exhaust improvements (which is one of the reasons FBodies never usually dyno as high as there Corvette brethren which has a much better chassis layout for an effective 3" dual exhaust with an X-pipe).
Alex has a solid foundation.....getting the bigger numbers is always related to the attention to detail in the rest of the build!
Cheers,
Tony
Big gains from the exhaust improvements (which is one of the reasons FBodies never usually dyno as high as there Corvette brethren which has a much better chassis layout for an effective 3" dual exhaust with an X-pipe).
Alex has a solid foundation.....getting the bigger numbers is always related to the attention to detail in the rest of the build!
Cheers,
Tony
What you put together is definitely a well thought out & wicked combo in itself, but it just needs the right combination of parts on the in & out to really make it shine!
I can definitely feel this gain...car is on another level in the top end.
Safe to say, dropping 15 lbs off the back of the crank with a Mamo RPS BC2 clutch, this should net 480+rwhp
All this is happening with a 227/231 cam 346 LS1
04-09-2017, 10:58 AM
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Originally Posted by manzo81maro
Thanks Tony!
What you put together is definitely a well thought out & wicked combo in itself, but it just needs the right combination of parts on the in & out to really make it shine!
I can definitely feel this gain...car is on another level in the top end.
Safe to say, dropping 15 lbs off the back of the crank with a Mamo RPS BC2 clutch, this should net 480+rwhp
All this is happening with a 227/231 cam 346 LS1
What you put together is definitely a well thought out & wicked combo in itself, but it just needs the right combination of parts on the in & out to really make it shine!
I can definitely feel this gain...car is on another level in the top end.
Safe to say, dropping 15 lbs off the back of the crank with a Mamo RPS BC2 clutch, this should net 480+rwhp
All this is happening with a 227/231 cam 346 LS1
And you're right. You gotta pay attention to getting air in and out of these things. The wrong exhaust can really choke them back - as you've seen.
04-12-2017, 08:36 AM
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Originally Posted by big hammer
More air in, more air out
04-15-2017, 09:28 AM
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04-15-2017, 09:49 AM
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Thanks guys!! In this case, YES bigger is better!!
Just had the exhaust finished up a couple days ago...
4" slipped over the Y outlet into 4" QTP cutout kit #QTEC40CP, then reduced back down to factory SLP CME catback:
Next, I will try to hit the track in a week or so to see what she does with the 10-bolt still in there....
Then I'll get the S60 setup bolted up and hit the track & maybe dyno again...
I know many have done this before but I think it's really interesting to see for yourself exactly what each mod does for power and performance
R&D = $$$ ............ doin it for ls1tech!!!
Just had the exhaust finished up a couple days ago...
4" slipped over the Y outlet into 4" QTP cutout kit #QTEC40CP, then reduced back down to factory SLP CME catback:
Next, I will try to hit the track in a week or so to see what she does with the 10-bolt still in there....
Then I'll get the S60 setup bolted up and hit the track & maybe dyno again...
I know many have done this before but I think it's really interesting to see for yourself exactly what each mod does for power and performance
R&D = $$$ ............ doin it for ls1tech!!!
Last edited by manzo81maro; 04-17-2017 at 09:57 AM.