How much horsepower on a supercharged Marauder from from headers?

[Themarauderguy]

Okay I'm sure this has been asked before, but I'm going to ask anyway how much horsepower can I really expect on an Eaton swap stock block 04 Marauder if I put headers?Basically what I want to know am I going to feel the difference is it going to make a difference in how easy the tires spin just curious any inputs welcome sarcasm is welcome as well. Lol

[ChiTownMaraud3r]

Forced induction cars have seen up to 50HP increase with long tubes.

[RubberCtyRauder]

it will need to be tuned to benefit

[lji372]

it will need to be tuned to benefit

No really? Say it ain't so....:lol:

[RubberCtyRauder]

No really? Say it ain't so....:lol:

it sounds like he thinks it's just a bolt on and viola ,added hp..that's the way i read it

[Themarauderguy]

No I know I would need to retune to benefit just curious is it worth it am I going to feel the horsepower behind-the-wheel increase or not? And to the guy that posted some people have seen 50 horsepower gain that's quite a bit I think.

[RubberCtyRauder]

25 + hp for sure, engine will breathe better with a wider power band,

[guspech750]

Over 8,000?


Sent from the White House on the tax payers dime.

[lji372]

Long term bang for the buck is boost. The end.....

[Themarauderguy]

I'm already supercharged Eaton swap just wondering how much more horsepower that would add to my car putting headers on it. And would there be a noticeable difference in the takeoff and horsepower feel in the car in general. So far I got my answer I think anyway. Lol

[Ambitious1]

This may help:

https://www.mercurymarauder.net/forums/showthread.php?t=66621

[robertmee]

I gained about 30hp with my long tubes and a tune.

[sailsmen]

Depends on where you are currently at. Are you going to run a Street Tune on 91 Octane? What type of heat exchanger, etc...

[WPG_Merc]

Best to re-tune/dyno with the headers at Mo's in GA,They can get the most
HP out of it without blowing it up. :burnout:

Worth the trip. :2thumbs:

[justbob]

After the obvious pulley swaps, next up is a small shot of nitrous, then headers.

That's more or less the list in order for more power after S/C.

Pulleys alone will get you good power, the right combo will even remodel your stock engine with all new windows..


Sent from my iPhone using Tapatalk

[Themarauderguy]

What pulley setup would you recommend for the most power? right now I have the stock Eaton upper pulley and a 2-pound lower pulley ring. 39 pound injectors lightning 90mm mass air flow. Stock heat exchanger from 03 Cobra and tune on 93 octane. My supercharger has been ported as well. But the pulley and everything else on the supercharger still stock.

[RubberCtyRauder]

are your internals stock? if so stay 425-435 rwhp. pulleys create heat, might want to look into a killer chiller. just had one put on mine after porting blower, changing lower pulley. iat's near 100

[RubberCtyRauder]

what are your numbers now? psi? stock internals for longer life, stay 9-11psi, 425 rwhp range has been the general consensus here for years. some push more, some less. sort of depends on your "oh crap" $ availability if you push it too far. must have a good tune as well

[Themarauderguy]

I have two other Marauder engine sitting in my shop so not too worried about the engine blowing up or longevity and that factor I just like to play with these things from time to time. It's been remote tuned not sure what my numbers are but I'm sure it could go a lot more if I put headers on it I figure in a 4lb lower pulley I can probably be around 12 pounds of boost. It started to cool down in Texas right now so probably won't do a killer Chiller till after March or so this coming year. My other thoughts are taking a pi 2 valve block pulling the heads off put the marauder heads and front timing cover assembly on it which would lower the compression ratio of course it would not be forged internals but I'm curious to see how far that could go on stock internals. This is just kind of a hobby I do on the side I know a lot about the 4.6 double overhead cam engines and the two valve 4.6 Crown Vic engines as well as the 5.4 single overhead cam and double overhead cam engines so I like to mess with these just as something to do as a hobby from time to time. Manly in this thread I was curious about headers and what the performance increase would be on a supercharged marauder.

[RubberCtyRauder]

they dont call them a Heaton for nothing, a 4 lb lower and 3.0 upper on a trilogy is around 15 psi. i have a 4lb lower, 2.8 upper trilogy at 17 psi. my rods and pistons are forged. if you like yanking motors all the time, then boost it up and grenade them. Regardless if the weather is cooling off, upping boost adds heat, get a better heat exchanger...its a 4400 lb car with driver, not a 3700 lb mustang of same year

[RubberCtyRauder]

lightning maf will prolly be pegging at 440-450 hp, so will need to either change mafs or get a maf extender

[Themarauderguy]

Really you think the lightning maf will peg at only 440-450. Wow! Wow I thought lidio had those numbers on the stock mass air flow with his Trilogy huh that's crazy. And the stock Eaton upper pulley is like a 3.7 not a 3.0 so with a 4lb lower it probably be around 12 to 13 lb of boost. I read that somewhere in the old threads on this form. I pull a motor every weekend in fact I pulled an engine out of the marauder with the help of my brother of course and installed it TurnKey running in a 9-hour day. Like I previously stated I do this for fun so but I definitely appreciate all your info I'll definitely be looking into a bigger heat exchanger that sounds like a plus like I said as well as a killer chiller. I think we all know a Whipple is the best choice at the end of the day and down the line when I decide to forge an engine and get carried away with all that I'll probably look into that one day not right now though. Lol and I think I'll also be looking into a set of headers as well I like the input I received on that thanks guys.

[RubberCtyRauder]

Trilogy is pretty much same thing as eaton. cobra eaton is M112, trilogy eaton is a MP112. inlets are different and intake side. i have a trilogy, not a eaton swap. stock upper is like a 3.4 on trilogy, maybe 3.6 on a cobra. im tellin you what im famiar with. my lightning maf pegged, added a mafia extender to get to 455, now changed to sct ba 2600, no extender.

[Themarauderguy]

Okay well I'll take it from a person who sounds like they know their stuff. so I'll definitely look into that as well the mass air flow extender. But you think I'll be okay with the four pound lower with the stock upper or should I just stick with the two pound lower and go with headers and a killer chiller.?

[RubberCtyRauder]

get a boost gauge to see where it is at...the marauder is a 10:1 compression motor, the cobra mustangs motors were 8.5:1 compression, im not sure if all were, im not positive if they had diff. ratios of compression at different times. who is remote tuning it? Askthem about pulley swapping. every car tunes differently.

[sailsmen]

With a stock motor, Vortec with no headers 450RWHP on a DynoJet.

[tbone]

Trilogy is pretty much same thing as eaton. cobra eaton is M112, trilogy eaton is a MP112. inlets are different and intake side. i have a trilogy, not a eaton swap. stock upper is like a 3.4 on trilogy, maybe 3.6 on a cobra. im tellin you what im famiar with. my lightning maf pegged, added a mafia extender to get to 455, now changed to sct ba 2600, no extender.

When you upgraded the MAF did you need to tune it again or was it plug and play at that point?

[RubberCtyRauder]

I did a bunch of changes at once, ported trilogy, accufab TB, SCT BA2600 MAF, Killer Chiller, LFP intercooler, lower pulley change so it was re-tuned on dyno..now 495/468

[tbone]

If the car is already tuned for a supercharger, would switching from a Lightning to an SCT maf require a new tune? I'm sure it would be optimal but....$$$

[RubberCtyRauder]

If the car is already tuned for a supercharger, would switching from a Lightning to an SCT maf require a new tune? I'm sure it would be optimal but....$$$


I don't know..Mine had a Diablo MAFia extender on the LIghtning MAF which I wanted to get rid of. If you Lightning MAF is not pegging, then it prolly wouldn't change anything, but I'm not the one who knows that answer

[tbone]

I don't know if it is pegging or not. But if there is some hidden power I would like to tap it.
I had the Diablo MAF. My tuner didn't set it up although he said he did. So I just said good enough and sold it.

[Themarauderguy]

I would be happy with 440 450 to the rear wheels my blower is ported as I mentioned yesterday as far as maxing out the block I'm sure I'm nowhere near close to maxing out right now lidio claimed the trilogy kit was pushing 450 to the wheels with the stock mass air flow which is not a 90 mm lightning. so you do the figuring once again every car is different we all know that. My topic was this would headers add horsepower and would I notice it behind the wheel. the feel when I punch it wide open throttle that's what I was looking for I found my answer so far. as far as the pulley I'm sure I could go with a 4 lb lower I'm running on 93 octane yes a killer Chiller will come later. As stated yesterday as well I'm not worried about blowing my engine up I work on these things all the time and build them so that's not a big deal I'm looking to see how far the stock block could go not trying to blow it up per se. Lol just curious how far could go the other thing I said was I would like to take a Crown Vic Pi engine 2 valve put my Marauder heads and assembly front timing cover on it which would lower the compression ratio to round 8.5 give or take and then I imagine the extra boost will be able to run without having to worry about it pre detonating. I to also had a Trilogy Marauder and when i would stomp it at 55 it will break both rear back tires lose my current eating swap doesn't even come close to that!!! And that car made 10 lb of boost on 91 octane tune no headers 355 rear axle just like my current setup. Except the trilogy wasn't ported. my eaton is. My car was remote tune by Martyo by the way. Lastly the reason for the header discussion was if it wasn't a significant gain I wasn't going to waste the money I figured if it was close to the same what's the point in the mod. Hp/tq not to get off topic but I think the trilogy blower outperforms the eating just a personal opinion though. I know and theories they are pretty much the same.

[sailsmen]

The stock Trilogy ~390 to 402RWHP.

Per Lidio - "Also this exhaust work was only worth about 12 HP at the rear wheels even after we upped the boost to 11.8. For now the number one car is making 402 at the rear wheels."

https://www.mercurymarauder.net/forums/showthread.php?t=5099

[ChiTownMaraud3r]

Make it as conservative as possible if you want to drive it and not have to rebuild it. Broke mine with 440rwtq.

Internals are not made for this extra power.

[Themarauderguy]

I don't mind rebuilding it I have two extra Marauder engines now and actually working on a Mark 8 block with Marauder heads as well. My brother already did this the Mark 8 with the marauder heads on it his cars that worked out well. On the trilogy website shows the trilogy made 430 rear wheel horsepower with a 3.0 pulley and an 80 mm mass air flow with Kooks Headers. I can live with 425 horsepower and torque I know I'm not close to that right now. my Trilogy car was something else. Has anybody ever ran a Trilogy supercharged Marauder against the eaton swap one I would be curious to see the comparison both at 10 # boost.

[sailsmen]

Just go with Nitrous!:D

[ChiTownMaraud3r]

I don't mind rebuilding it I have two extra Marauder engines now and actually working on a Mark 8 block with Marauder heads as well. My brother already did this the Mark 8 with the marauder heads on it his cars that worked out well. On the trilogy website shows the trilogy made 430 rear wheel horsepower with a 3.0 pulley and an 80 mm mass air flow with Kooks Headers. I can live with 425 horsepower and torque I know I'm not close to that right now. my Trilogy car was something else. Has anybody ever ran a Trilogy supercharged Marauder against the eaton swap one I would be curious to see the comparison both at 10 # boost.

The main difference is the intake is more restrictive on the trilogy. Not sure what that does to power output at same boost.