im about to purchase a mhg should i go a little bigger than stock and lower the compression? i only have stock components how bout some pros and cons fellow gearheads thanks
should i lower my compression
- Thread starter speedfreak
- Start date
lower compression = more power from more boost on pump gas
higher compression = more low end, faster spool, less boost on pump gas
make sure to deck your head and block. you need completely flat surfaces for a mhg to seal, and DON'T use a head gasket sealant
higher compression = more low end, faster spool, less boost on pump gas
make sure to deck your head and block. you need completely flat surfaces for a mhg to seal, and DON'T use a head gasket sealant
it depends on what kind of turbo you are going to put on it. Because you are asking the question, I assume you are using a stock turbo. The car will be more fun to drive if you raise it a bit. Go with a standard-thickness after resurfacing.
Stock boost, stock turbo, no boost controller, no shimmed wastegate, 3" TB, no cats, running 8.5psi on pump gas.
Last edited:
Adjuster
Supramania Contributor
Heck, at 8.5psi, the higher static CR would be nice for sure.
Mine was designed to be 9:1 static CR, but I'm also running coatings that help control/lessen issues where heat is concerned.
If I build another 7MGTE again, It will be higher static CR. Much more fun to drive around town as you are not in boost most of the time. Also the stock turbo is fine for the stock motor at lower boost pressures especially. Say less than 12psi.
Concentrate on getting the most out of your 8.5psi. Better flowing IC pipes is a good place to start. (I picked up pressure just by removing the cast lower IC pipe that is bolted to the right frame rail... Replaced it with a section of metal conduit pipe cut to fit, and it gained me more boost pressure at the manifold at the same waste gate setting.. so net gain with no downside.)
In your avatar, you have hard pipes up on top, did you replace the lower ones too? Go true CAI for your filter, and pick up a few more free hp as well. (Just move your filter to the area under the right headlamp with a short section of 3" pipe through the snorkle hole.)
In short, I like my higher than stock CR.
Mine was designed to be 9:1 static CR, but I'm also running coatings that help control/lessen issues where heat is concerned.
If I build another 7MGTE again, It will be higher static CR. Much more fun to drive around town as you are not in boost most of the time. Also the stock turbo is fine for the stock motor at lower boost pressures especially. Say less than 12psi.
Concentrate on getting the most out of your 8.5psi. Better flowing IC pipes is a good place to start. (I picked up pressure just by removing the cast lower IC pipe that is bolted to the right frame rail... Replaced it with a section of metal conduit pipe cut to fit, and it gained me more boost pressure at the manifold at the same waste gate setting.. so net gain with no downside.)
In your avatar, you have hard pipes up on top, did you replace the lower ones too? Go true CAI for your filter, and pick up a few more free hp as well. (Just move your filter to the area under the right headlamp with a short section of 3" pipe through the snorkle hole.)
In short, I like my higher than stock CR.
Adjuster said:
Oh, I am. Increasing the boost manually will be the last, very last thing I do IF I ever do it.
That pic is a front, you see that black "coupler" thats actually the stock IC piping. Stock IC and piping, only replaced the piping you see in the pic.