T3/T4 turbo reinstalled

[XoX1de]

Removed my small T3 turbo and put back in the T3/T4 50trim, BIG power difference... Recently I installed the JDM intake cam, I lost huge low end and not gaining much on top, ( thats with the small turbo). I wonder why that s*** happens and yesterday, I read article about turbo and overlap till 2am. Learnt something important..

RULE: Small turbo will work bad with high overlap cam 5 degree and more, so small turbo work best with stock cam (in the case of stock MSP).

Big turbo loves overlap, but not much (7-10 degree). So in general, the bigger the turbo, you have to treat the engine like an naturally aspirated.

 

[dandan2]

Removed my small T3 turbo and put back in the T3/T4 50trim, BIG power difference... Recently I installed the JDM intake cam, I lost huge low end and not gaining much on top, ( thats with the small turbo). I wonder why that s*** happens and yesterday, I read article about turbo and overlap till 2am. Learnt something important..

RULE: Small turbo will work bad with high overlap cam 5 degree and more, so small turbo work best with stock cam (in the case of stock MSP).

Big turbo loves overlap, but not much (7-10 degree). So in general, the bigger the turbo, you have to treat the engine like an naturally aspirated.

i dont get ur last statemen, how do u treat a turbo car like its naturally asperated? higher rpms?

 

[XoX1de]

i dont get ur last statemen, how do u treat a turbo car like its naturally asperated? higher rpms?

Big turbo tolerate more overlap because theres less back pressure pre-turbine and more pressure in the intake, so theres no reversion (exhaust return into combustion chamber)

So that means if you run stock turbo, dont put JDM intake camshaft....

 

[dandan2]

so how does it run? im building my motor and gonna be running a gt3071r most likely and i may mildly build the head aswell. or i may just have some custom ground.

 

[XoX1de]

I need better timing I guess, im runing with water injection and my timing is pretty retarded... But very safe. It runs flawlessly. Im sure I can sqeeze alot more poney by advancing the timing but I dont want to risk it, gotta put it on dyno.

 

[dandan2]

got any pics of ur setup? can u pm them to me? i wanna see the meth setup.

 

[XoX1de]

got any pics of ur setup? can u pm them to me? i wanna see the meth setup.

click on the link in my signature, you got them there

 

[MSP 2 K20]

you read an article and now you are the forum tuning master!
(rofl)

 

[big Lou]

you read an article and now you are the forum tuning master!
(rofl)

He never said that! He was just stating an article he read......

 

[MSP 2 K20]

i'm poking fun at him b/c he bumped an old thread of mine talking trash.

 

[big Lou]

Gotcha!!!

 

[Amdeus]

XoX dial out the overlap with adjustables

 

[justanothermp5]

No MAF? so your running a full standalone?
dam, must be nice lol

 

[Tzar177]

So keep stock intake cam on stock turbo, but its ok to upgrade exhaust cam?

 

[yudkib]

No MAF? so your running a full standalone?
dam, must be nice lol

hes standalone on megasquirt, and just posted a TON of info on how to do it in one of my threads.

 

[XoX1de]

I read far more than just an artcle, I read a dozen of books about engine management and force induction...

 

[XoX1de]

XoX dial out the overlap with adjustables

bought the adjustable cam gears already

 

[yudkib]

I read far more than just an artcle, I read a dozen of books about engine management and force induction...

im planning on getting a copy of maximum boost, but i need one on just EMS tuning. can you make a recommendation? ive heard good things on "how to tune EMS" by jeff hartman.

 

[littlemimus]

I read far more than just an artcle, I read a dozen of books about engine management and force induction...

give us a list!!!

 

[big Lou]

How big was your small t3? Also what Brand??