Mauricio Evo IV

iTrader: (1)

Red line its the new turbo and blue old turbo.
Hello guys, recently I change my blown turbo 6266 journal bearing to a ball bearing.
I bought the turbo used, but the guy who sold, told me was journal and not. Its a ball bearing and hotside its not 66mm. According to PTE its a 68mm, so the turbo its 6268 supposedly.
I made a datalog with the new turbo whithout tune and numbers are low than 6266 journal.
Yes, I know, I need to retune the car, but if the turbo its bigger than the old one, without tune I expected better numbers than before with the same boost dont you think?
The car its ok in afr with 27-28psi and zero knock. But I dont know right know if the turbo its ok or what.

heres the dyno grahp.

maxroach

iTrader: (12)

Its a starvation of air (boost) at top end.

Your tuned boost at top end from 66 opens your WG and limiting exhaust gas to spin 68 Turbine wheels. 68 is higher rotational mass than 66, a bit heavier to spin.

kaj

iTrader: (60)

Swapping turbos without a tune isn't going to do anything, really. It's pretty dangerous to drive it that way, so get 'er done!

LetsGetThisDone

iTrader: (1)

Is the new turbo making more or less boost than the old one?

kaj

iTrader: (60)

He says it's the same.

Mauricio Evo IV

iTrader: (1)

Yes man, same boost... 27-28psi

Mauricio Evo IV

iTrader: (1)

Can you check my datalog???

maxroach

iTrader: (12)

Your 66/66 spools faster by 600 RPM. Ref blue circle. Wastegate open and cant keep the 66/68 turbo spool at your RPM Limit. Green Circle
My safest suggestion is,
Re-tune it to your set up.

Mauricio Evo IV

iTrader: (1)

Thanx man for your suggestion.
I will search a good tuner, because my tuner I think have a lot of work and cant help me....
Someone you can recommend to make some adjust in the tune?

maxroach

iTrader: (12)

Where are you located?
What wastegate are you running?

Mauricio Evo IV

iTrader: (1)

Im from El Salvador in Central America. I use a Tial 44mm wg.

maxroach

iTrader: (12)

Mauricio Evo IV

iTrader: (1)

Im using a mix spring. Without boost (boost controller close) the car boost 28 psi.

maxroach

iTrader: (12)

You don't have a problem with your boost. Boost is fine.

Problem is, When you hit 28 psi on your boost, the WG is fully open already. Exhaust gas losses energy to spool the Turbine Wheel.

You need to have higher compression spring to control your WG until 7000 - 7200 RPM.

Mauricio Evo IV

iTrader: (1)

just one more question.

If I run the car like this, is there a problem? The car not detected knock and afr its ok for the gas that use + methanol.

I think run more boost (33-34 psi) with Q16 or Torco 118 octane... and I have the tune with more gas and timing