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Anyone using High-Flow, VG30, RB25 turbo or aftermarket turbo on RB20

Mr Rb20

By Mr Rb20,
in Engines & Forced Induction

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Mr Rb20

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Thanks Luke.

I have a Veilside chip in my car so i am wondering if they will adapt to the R33 turbo ??

How about injectors and fuel pump ?? Have they stood up to the task or have you changed them ??

What about adding a fuel pressure regulator ??

Also, what sort of difference is there between driving with this turbo and your standard turbo ?? ie does boost come on earlier, harder, longer etc ??

In other words, how does it drive ??

Thanks

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Luke C Contributor

Luke C

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I would definately get your AF ratios checked on a dyno with the Veilside chip. It is obviously going to be tuned more aggresively than the standard chip, ie more advance and probably leaner mixtures. Having said that, the difference in airflow between the standard turbo and the R33 would not be huge, so you may get away with the ecu setup that you have. Better safe than sorry anyway.

Your injectors should still be fine with the mods that you have listed. Your fuel pump should also be able to keep up as long as it is in good condition, but again this is something that you should probably check. An adjustable fuel pressure reg is a bit of a band aid solution in my opinion, and should not be needed if it is tuned correctly. The only time they are useful is when your injectors start to run out of flow, which I don't think will be an issue for you yet. Other people on here will have a much better idea on this than I do.

As for how it drives, with 10psi boost it feels pretty soft through the mid range, coming on boost a little bit later than the stock turbo, and then starts to go better than stock when it hits 5000rpm. At 14 psi it is much better, pulling much harder than the stock turbo from about 4500 all the way to redline. It is definately worth doing.

Sydneykid Grand Master

Sydneykid

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Posted

Hi Mr Rb20, we have not found any difference between the compressors, plastic or not. The failures have all been the ceramic turbine. The R34 killed a turbine at 12 psi and the R33's did the same.

When I have a car with a ceramic turbine in it I stay under 10 psi, I just don't like the consequences. As fast as I can I upgrade it to a steel turbine, even if it is exactly the same size as the standard ceramic. Hi flowing is of course better but more expensive.

Hope that helps some more.

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