[joshdj13]

ok so i've been reading post about running a somewhat high c/r and a s/c. i like codycat want to run a high comp 2v from mmr but i'm not sure what there high c/r numbers are and i really would rather know now than to wait till after the holidays. i saw that 10:1 is suppose to be good with a centri but i dont know how high i could go. also if i change the c/r will i need to run a different octane fuel?.

my goal for the car is to have a dd/occasional strip car that puts down 500-550 with a high c/r and a vortech s/c. i also like codycat will be putting a blower on a while after the bottom end is replaced.

[stal94gt]

if your looking for 500-550 there is no need for high compression. a good 9.5-1 cr with heads/cams can get you there with a good intercooled vortech setup.

[MacDizzle]

i got mine 9:5:1 with future supercharge plans. Prepare to wait.

[stal94gt]

if your going to do this i recommend doing it right the first time. best advice for you would be to build an aluminum block with 9.5-1 cr and instead of going with a base vortech kit i would piece together a v7 ysi trim.

[MacDizzle]

What does trim relate to?Vortech V-7 YSi-Trim Supercharger <-- This thing looks awesome. What other mods do i need to make 500hp on top of my MMR 750SE 4.75L? Injectors and fuel rails?? What would you suggest?

Originally Posted by stal94gt if your going to do this i recommend doing it right the first time. best advice for you would be to build an aluminum block with 9.5-1 cr and instead of going with a base vortech kit i would piece together a v7 ysi trim.

[stal94gt]

trim is the size of the supercharger. the larger the sc the more cfm it pushes. cfm is accualy all that really matters. think of it this way. you have a one inch diameter hose pushing water at 12 pounds of pressure, then you have a 4 inch diameter hose pushing water at the same 12 pounds. the 4 inch hose will pass more water than the little one inch hose. this is a simmilar concept to how a sc works except a small s trim super charger is compressing less air per cubic inch than a ysi can. also when a small trim sc is over spun it generates heat which is power loss and hot air also shows up as false boost (more pressure with out increasing cfm).

[MacDizzle]

So basically i should go with the big one which is stronger and can move more air even though i plan on moving less air than it wants to push? So my motors internals are capable of withstanding 750 HP and I only want to make about 500 or so. Running the V7 would be right in line with making my dream of max bulletproofness a better option than running a lesser Supercharger pushing the same amount of boost and making more heat. Sounds good buddy! lol

Originally Posted by stal94gt trim is the size of the supercharger. the larger the sc the more cfm it pushes. cfm is accualy all that really matters. think of it this way. you have a one inch diameter hose pushing water at 12 pounds of pressure, then you have a 4 inch diameter hose pushing water at the same 12 pounds. the 4 inch hose will pass more water than the little one inch hose. this is a simmilar concept to how a sc works except a small s trim super charger is compressing less air per cubic inch than a ysi can. also when a small trim sc is over spun it generates heat which is power loss and hot air also shows up as false boost (more pressure with out increasing cfm).

[stal94gt]

honestly there really is no diff in supporting mods for a 500 hp car and a 600 hp car. you will need to have 60# injecters and a decently sized fuel system. i belive your goal should be around 600 hp and yes for those power levels a v7 ysi trim would be a great blower setup. you cant really under spin a big blower or else you will loose bottom end power. personaly if i could do it all over again with a 2v i would have gone

aluminum block standard bore standard stroke mmr 900 sb with 9.5-1 cr
ported stock heads (bonze guides, high load springs, and timeserts)
custom grind blower cams
eddie intake mani, with a 6061 intake elbow
v7 ysi head unit, bracket and install kit
cx 31x12x4 ic
ais meth kit
return fuel setup
80# injecters
sct ba 5000 maf/hpx slot maf
tial 50mm bov with a smaller bypass valve to keep thing quiet

[joshdj13]

Originally Posted by stal94gt if your looking for 500-550 there is no need for high compression. a good 9.5-1 cr with heads/cams can get you there with a good intercooled vortech setup.

well i'd like to have a 300+ hp n/a before i go f/i. i'm going with mhs stage 1 head and blower cam after i do the shortblock so i want to go with a high enough

[99GT35thLE]

MMR builds the shortblocks to what you want. So you decide on what CR they will build the motor to based on what heads you plan on using.

[Scott2001GT]

I would go higher than 9.5:1

[codycat91]

Originally Posted by joshdj13 ok so i've been reading post about running a somewhat high c/r and a s/c. i like codycat want to run a high comp 2v from mmr but i'm not sure what there high c/r numbers are and i really would rather know now than to wait till after the holidays. i saw that 10:1 is suppose to be good with a centri but i dont know how high i could go. also if i change the c/r will i need to run a different octane fuel?. my goal for the car is to have a dd/occasional strip car that puts down 500-550 with a high c/r and a vortech s/c. i also like codycat will be putting a blower on a while after the bottom end is replaced.

Hey watch your mouth! Mine is a 4v! lol

[stal94gt]

Originally Posted by joshdj13 well i'd like to have a 300+ hp n/a before i go f/i. i'm going with mhs stage 1 head and blower cam after i do the shortblock so i want to go with a high enough

Depending what octane gas you are going to run will determine what cr and boost you should run. If you have e85 on tap I would go with a higher compression than if you run 93. You make more power with boost than higher compression so a motor running 10-1 cr and 12 pounds of boost wont make as much power as a 9.5 cr motor and 20# of boost

[Shaun03GT]

Originally Posted by Scott2001GT I would go higher than 9.5:1

Theres really no need for 550rwhp. Can easily make 650 with 9.5:1 and the right setup.

[thereal2v2fear]

Originally Posted by stal94gt if your going to do this i recommend doing it right the first time. best advice for you would be to build an aluminum block with 9.5-1 cr and instead of going with a base vortech kit i would piece together a v7 ysi trim.

why not a v7 JT trim?

[stal94gt]

the v7 jt trim head unit is a good head unit, it is the step up from a t trim and a little better than a d1. the v7 ysi trim is the largest head unit that fits on the bracket made for our car and it pushes enough boost to put most built motors with heads and cam well into the 700 hp range

[joshdj13]

Originally Posted by codycat91 Hey watch your mouth! Mine is a 4v! lol

my bad, i meant to put i want a 2v instead

[joshdj13]

well like i said i want to run the mmr 600 s/b(maybe the aluminator), and mhs stage1 ported heads and stage 1 blower cam. the reason for the higher c/r is because i want to break 300 or better n/a while i save up for the s/c.

[Scott2001GT]

Isn't about how much power. It's more efficient. There are a few gains from it

[joshdj13]

Originally Posted by Scott2001GT Isn't about how much power. It's more efficient. There are a few gains from it

just to peak my curiosity, what makes it more efficient and are there more gains than just hp?

ok, so should i go with the 4.75(750hp rated) block or stick with the 600?
i've got it down to stage1 heads and blower cam combo, 42# injectors(may go higher), lightning maf, some trim of vortech, and idk what kind of fuel pump to go with. any suggestions on that as far as what will support my hp goals of 500-550? also has anyone used this intercooler?Mishimoto Universal M Line Intercooler - Black at AmericanMuscle.com - Free Shipping! whats a recommended one if not.

is there anything that i'm missing?