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Rb25de To Rb25det Conversion


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  • 1 month later...

Sorry for bringing up an old thread. I recently did this conversion; well, sort of, my engine was originally turbo so had less to worry about.

Off the top of my head: (most are obvious)

- Intake manifold (this isn't fun)

> ensure turbo injectors and fuel rail too

- spark plugs from 1.1 to 0.8 gap

- exhaust manifold

- Dump pipe

- Down pipe (may require modification if using stock NA exhaust, mine required cutting and rotating)

- turbo (derrrrr)

- ECU can be S1, S2, doesn't make a difference

- J pipe from throttle to intercooler piping

- find yourself a new BOV, mine leaked

- turbo intake pipe to Airbox (MAF suiting ECU)

- intercooler piping A & B that mount to SMIC

> if you're doing SMIC (R34 suits also)

> will require SMIC mount too (R32 won't fit)

- check brake booster hose from intake hasn't been tampered with as it will affect braking

- 2m of vaccuum lines will be required, don't use the old shit you have

- coolant hose that runs from back, drivers side of motor, around and onto turbo (feed)

> contact me if you want pics

- oil return turbo (R34 suits also)

- oil feed turbo (R34 suits also)

- boost solenoid with hosing that connects to wastegate and then intercooler piping

- recommend AFR ratio gauge, aftermarket boost gauge (standard is in mmHg and maxes out 15ish psi so if you're free boosting at first, you will easily blow past that) [assuming your cluster even has a boost gauge]

- as for compression ratios, mine was originally a turbo motor so I was in no worry of anything like that

- your clutch if rated to 200hp (NA) won't like the extra 80kw

- your running gear in general probably won't want too much abuse if NA is made any weaker (I personally don't know)

Have fun, best modifcation I've ever done. Only costed around $1500 to $2000 to do it properly with genuine and quality gear. If you're a pizza boy you could do it way cheaper if you need to.

Edited by R33 Jared
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