4Age 20Bt Turbo

[rhysscott]

hi all

just a few questions as I'm not sure if I'm getting correct answers from people doing work so

i running as title says 20v BT turbo in my rolla and so wondering should vvt be used or disabled when turbo?

also got defect few weeks months ago and had to get emmissons test at botney so had to put in euro cat, how much power should one expect to lose compared to before when i had no cat?

and lastly what sorta power is normal/expected for said engine all std running @ 11psi

thx

[Subaru_kid]

LOL

 

 

 

 

Just go put it on a dyno...

[rhysscott]

thx for the awsome post nice way to waste 10secs

 

don't see how putting it on a dyno will tell me if vvt needs to be on or off? which is the only part i was actually looking for help with

[ke70dave]

err....

 

the dyno will tell you EVERYTHING.

 

do run on dyno with vvti off.

do run on dyno with vvti on.

 

compare, if it makes any difference?

 

there is alot to VVTI tuning, so i would be talking to a reputable tuner to get his oppinion on it. as its not just switching on vvti, its:

 

-where in the rev range do you switch it on?

-what changes to the fuel map do you make if you turn it on? (there will be some)

-what changes to the ignition advance map do you make if you turn it on? (there will be some)

 

but i cannot see any reason why incorporating vvti into your tune wont give you advantages, more air can only ever be a good thing, but its going to take alot of development in order to get the full advantage.

 

same deal as the cat. if you get the biggest cat you can get, with the lowest number of holes, on a 1.6L i can't imagine it will lose more than 10kw. complete guess here.

 

also, there is a HUGE difference between tuning for power, and tuning for emissions. if you are trying to pass the emissions test, you may need to get your tuner to completely rethink how they tune it. Tuning for emissions can be possibly alot more difficult than tuning for power. and some tuners might not even bother doing it.

 

as for the power you expect it to make, that is not a completly answerable question, but here is a good start:

 

http://www.not2fast.com/turbo/glossary/turbo_calc.shtml

[Subaru_kid]

thx for the awsome post nice way to waste 10secs

 

don't see how putting it on a dyno will tell me if vvt needs to be on or off? which is the only part i was actually looking for help with

No worries. Glad I could help.

 

 

 

 

Refer to KE70dave's post...

Edited September 18, 2012 by Subaru_kid