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Increasing redline on RB25

JimX

By JimX,
in Engines & Forced Induction

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JimX Grand Master

JimX

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Is it safe to take the redline up to 7500rpm or so? With stock internals, and a PowerFC. I've got an adjustable exhaust cam gear so that should help with any breathing problems, but I'm also worried about affecting the longevity of the engine.

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https://www.sau.com.au/forums/topic/49107-increasing-redline-on-rb25/
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R31Nismoid Grand Master

R31Nismoid

Posted
Posted
Long term = completes a track session

Standard internals = un-opened motor

:D

:cheers: always the realist ;)

I took mine to 7500rpm no drams for over 12 months.

Motor died - but that wasnt due to revs, just a few too many psi snuck in one night and caused it to ping.

So 7500 all the way.

Although, i found with stock cams, the car didnt have any go after about 7300 at that was still pushing it.

Also due to many other factors aswell im sure, like ECU and all sorts of other things

krzysiu Grand Master

krzysiu

Posted
Posted

There is no point at all to increasing the redline, You will lose so much power after 6500RPM that its not even worth it. It may seem like its still pulling but on the dyno it shows that the HP drops like hell.

JimX Grand Master

JimX

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Although, i found with stock cams, the car didnt have any go after about 7300 at that was still pushing it.  

Also due to many other factors aswell im sure, like ECU and all sorts of other things

I'm only considering it because I've got an exhaust cam wheel, and will be running 15 psi after the tune. I used to run 15psi with the factory ECU, but the PowerFC at the same boost maxes out my injectors and AFM. So I'm running at 11psi until I get it tuned.

Anyway I'll see what the mechanic has to say when I take the car in. At least now I know I have some room to experiment.

aridyne Enthusiast

aridyne

Posted
Posted

I've run my Skyline up to 7500 for over 9 months now, I have had no drama's with this setting, however yes in Dyno runs I have found that there is no real power increase around the 6500 mark. I am running a Haltech E6K I think with a Stock engine and turbo along with ARE intercooler. I pulled about 187kw out of the rear wells and about 1350nm of Torque which I thought was quite high but this has been verified by two different dyno stations.. Also running the stock turbo at 14psi with a 3" Dump running into a Apexi 3.75 cat back exhaust.. (yes it scraps everywhere). I did a recent check and found compression to be around 135-150 over all 6 cylinders.. I have been told this is about right for a skyline, I dunno? shrug :P I think that a GT2540 would be great to upgrade to with new 700+cc injectors with fuel rail and pump to be upgraded as well. What ya think? do you think a new Cam gears would be wise too?

Aridyne

51jay Mentor

51jay

Posted
Posted

The exhaust camwheel retarded 3 or 4 degrees is good for enhanced torque low and midrange. In all our dyno runs stock and modified power tended to drop off fairly sharply over 7000. In the early days we hit 8200 on a regular basis.....but not anymore. After 3 years of street/drag/track the engine still doesn't use any oil between 5K changes so I guess the revs didn't hurt it any. When you get it tuned and see your power curve then you can decide on your rev limit

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