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Rb25det Turbo Upgrade

MZTRBO

By MZTRBO,
in Engines & Forced Induction

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MZTRBO Experienced

MZTRBO

Posted
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Posted (edited)

good info Mad082,

My main point of fuel consumption is to not have the turbo even boosting and hoping that the auto is changing at 2,500rpm or there abouts when driving normal, taking it easy.

My theory was that, If turbo is boosting the engine is pumping through more and more fuel as thats the point of the turbo in the first place, force air and fuel into engine. So if it is not operating I have 2.5ltr n/a economy.

If I give it I have rb25det power with larger turbo + bad fuel economy?

Am I making sense or correct in what I say?

Cheers

Thanx for all the replys, very helpful info as when I do something I want to do it right the first time (on a budget :thumbsup:)

"quote"the more air you put into the motor the more fuel that has to go it to make it run at the right air/fuel ratio. for example if the bigger turbo at 4000rpm flows the same amount of air the standard one does at 7000rpm, then at 4000rpm it is going to pump in the same amount of fuel as 7000rpm on the stock turbo. if you are worried about fuel economy, then don't change the turbo."quote"

Edited by MZTRBO
MZTRBO Experienced

MZTRBO

Posted
  • Author
Posted

FYI,

I have been cruising with another fellow member of sau Legend01.

Legend01's car was putting out 280rwkw's with a laggy turbo (rb20).

On this cruise we had both filled up full at the same time. The entire cruise was that simply crusing, as legend01's car was just in a run in/check everything okay phase.

At the end of the cruise (Id say easily 120-150klms) my petrol tank was just above half way. Whereas legend01's petrol tank was just off the full tank mark? I know that it has 500cc less capacity, though people do say stock for stock they have similar fuel consumption.

This is were the laggy turbo taking it easy theory = good fuel economy comes into play.

  • 9 months later...
MZTRBO Experienced

MZTRBO

Posted
  • Author
Posted

hi,

This is 8months old now, but I have results from my first post..

I ended up gettin the turbo on, it was hitting R&R badly..running rich as...

before turbo I got dump pipe also..

Anyways ended up making good power 234.9rwkw@11/12psi..

Fuel economy is great..went for a drive after safc tune at hitmans...180klms so far to not even 1/4 tank..im sure i will get 450-480klms out of full tank..

theres a thread in forced induction with results n graph FYI

Cheers

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