need gasket advice for boosting a 3.4 dohc

[no_doz]

lol thats pretty much what i had figured on but i figure id have them tilted 120* with short/straight runners that flow air directly to the ports since its being crammed in at all times by a supercharger-& has each charger flow to 4 cylinders, so basically itd kinda be like 2 eclipse engines, each with its own charger, hooked together, at the crank, not pos mitsubishi, with all of that dohc v8 goodness

also if i go this route (strong possibility since it takes badass to a new level & besides the degree of it being so custom, it wont cost more than going out & picking up an m112)-id setup an idler pulley with another attached to it, & route a seperate belt from the secondary pulley to the S/C's-that way i could go wtih a stock belt & taking it all off seems like itd be a lot easier this way.

[robertisaar]

that challenger redefines bad-ass... especially for chrysler!

[no_doz]

they dont COME like that do they?????

[robertisaar]

they dont COME like that do they?????

if only....

maybe after everyone realizes that we, as humans, cause very little damage to the environment by ourselves, we might see twin roots chargers as a factory option. then again Buggatti Veyrons have quad-turbos, so you never know, they might do something crazy like this too.

[no_doz]

i dont see why not-from what ive been hearing everywhere a properly sized & placed roots supercharger increases both gas mileage AND power with a good tune-why not build smaller motors & just supercharge/tune them properly from the factory-supercharged v6 cars getting 30-35mpg would make a lot of people go out & buy a new car in a heartbeat-i know i would!

[no_doz]

as long as they are $5k out the door or less! LOL

[robertisaar]

to actually gain fuel economy from adding a blower, you'd need to shrink the motor. i don't know how some of the super3.8 manage to get like 31 on the highway when the NA version gets about the same...

[bszopi]

to actually gain fuel economy from adding a blower, you'd need to shrink the motor. i don't know how some of the super3.8 manage to get like 31 on the highway when the NA version gets about the same...

Tuning will play a huge part in this, as well as the actual build.

[robertisaar]

of course, but i'm still confused as to how the 3.8 with a m90 attached gets the same fuel economy even with the drag of the blower AND lower compression...

[no_doz]

the way i figure, the reason for the supercharged 3.8's being so good on gas with a tune & such is because most engines arent efficient enough topull in enough air to make enough power to pull themselves a long, & to compensate for this the stock fueling system will just beef up the fuel mixture to accomodate for the lack of ass that the engine doesnt have-but with the supercharger it gets as much air as it could possibly need at all rpm ranges, & with the GTP tall gear ratios they can run at the low rpms because their engines are getting fed the air they need to pull the car along with out running so rich, meaning they can cruise around at low revs & get good mpg.

if i am wrong as hell someone please correct me because this all seems to make perfect sense to me & thats kinda scary lol.

[robertisaar]

the m90s do have boost bypass valves, but i forgot they got higher gearing...

and most of your theory, i'm gonna say no, since the ECU/PCM is pretty much forcing the air/fuel ratio at 14.7 at all times, except for when at WOT/PE, so the PCM adding extra fuel to "accomodate for the lack of ass" doesn't hold water...

[no_doz]

i was under the understanding that the engine can recognize that its under heavy load (although im not quite sure how) & will take steps to compensate by pumping more fuel.

[robertisaar]

that extra load: its measured by the MAP (or MAF) sensor, and the PCM does add fuel... enough to keep the engine at a 14.7:1 A/F ratio, unless it goes into PE, and it will richen it up to whatever the PCM is tuned for...

[no_doz]

sad news-the aurora engine i was looking at buying has a broken timing belt & from what ive read it is an interference motor, & in that case there has been engine damage & screw that! also i figure im just going to buy the aurora, fix the leaking gaskets & sell it (theres like $2k there)- & possibly put the 3.4 in it DEPENDING on if it is damaged or if its just a fuel pump.

just out of curiosity-could a lq1 handle 2 m90's with say a light port, crank scraper, custom intake manny-on the stock bottom end-if i keep the boost low until such a time as i can afford to beef up the internal engine components? sorry, but im really liking the idea of 2 m90s due to how damn cheap they are to find in comparison with their larger counterparts, & if im going to make/have a custom intake fabbed up why not go for something unique if im going to have a year to put it together ya know. i really want to be able to stuff my foot right up the 370z's ass when he gets back-& i want to do it with an AMERICAN engine

also isnt 14.7 pretty higher? my understanding was that 11.5 is good for most applications-is this incorrect or are the factory tunes just THAT rich?

[robertisaar]

the EPA won't allow any car manufacturer to have the motor running at anything other than 14.7:1 due to emissions being lowest at that point. the 11.5 number that you got, that may be the ratio while at WOT....