Stock Rb25 - How Much Rpm ?

[The Mafia]

If you have any idea how the inside of an engine works, you'll understand that staying constantly near or hitting the limiter is bad. Actually it's really bad.

The higher you rev the engine the more rod stretch you're going to get. While these rods are bouncing all over the place, add some crazy ass cuts all along the crank and things are going to get all out of balance, at such a high rpm.

Now hitting the limiter isnt bad if you do it every now and then, but inexperienced "drift queens" that just want to slide think its cool to just hold it on the limiter, and it's kind of like these clowns that have a vent to atmosphere bov - they do it because they think it's cool.

Well, unfortunately no one cares about your bov or your coolness at hitting the limiter. They just want to see it blow up, hence why they encourage you. It's human nature to want to see things blow. . Also, if You bash the limiter you're going to show that you have no idea how to properly drift, to the people that actually can.

Learn throttle control, and learn about what limiter bashing all day long will do to a standard rb25. Their rods are weak. They are more prone to rod stretch and will not take abuse.

I swear the questions on this forum are getting stupider every day.

[zebra]

has anyone seen a rod failure in a 25?

I bent a rod in mine but that was due to bearing failure welding the rod to the crank

[Rolls]

has anyone seen a rod failure in a 25?

I bent a rod in mine but that was due to bearing failure welding the rod to the crank

All I've ever seen is detonation, bearing or oil pump related failures.

Never see a rod on its own let go with something else failing first.

[zebra]

exactly, I've seen more rod failures in 2J's than rb25s

but as you said, many other things will break in an RB before the rods see their limit

[MBS206]

Not very many engines like limiter bashing at all. When you limiter bash, you hammer the oil pump, when the oil pump cracks, you lose oil pressure and trash the motor...

I can tell you this from experience...

[MBS206]

has anyone seen a rod failure in a 25?

I bent a rod in mine but that was due to bearing failure welding the rod to the crank

Yes, dead standard RB25 bottom end, making 370odd RWKW... Nitrous Oxide was then added...

[Rolls]

Yes, dead standard RB25 bottom end, making 370odd RWKW... Nitrous Oxide was then added...

What rpm was used?

[Room42]

Here is a look at my hand controller. Its a stock internal rb25det hitting almost 8200 rpm at about 26 to 28 psi through a gt35r. I raised the rev limit to 8500.

The youtube clip is uploading now and should be ready in half an hour.

I took it a bit easy in first gear to prevent limiter bashing.

I guess another degree of timing can come out at the high load 8000rpm cells.

[Rolls]

Maxing your afm out, does that make it hard to tune?

[zebra]

Very nearly maxed AFM there

what is the timing at 8k WOT out of interest?

[Room42]

Very nearly maxed AFM there

what is the timing at 8k WOT out of interest?

8 degrees

edit: that's the z32 afm

Edited October 23, 2011 by Room42

[zebra]

ouch...would hate to see the EGT's

not that timing can be related between RB's due to the cas being a hunk of shit

[Room42]

Maxing your afm out, does that make it hard to tune?

I haven't tried it myself but I have heard that you guess what the timing and fuel will need to be after 8k and then change the 8k cells so the extrapolation works it out. I could be wrong.

That was the one and only time that engine will see that amount of rpm. The power fc lets you tune to 8k rpm anyway.

I'm about to upgrade my ecu to a map sensor based one so the afm maxing out wont be an issue.

[Room42]

ouch...would hate to see the EGT's

not that timing can be related between RB's due to the cas being a hunk of shit

The missus was watching the afr gauge and she reckoned it was mostly low 11's and went to 10.7:1 after 7500ish

Edited October 23, 2011 by Room42

[zebra]

fair enough, shouldnt be too bad then

[Room42]

I will eventually get an egt sensor and gauge but you know how it is with doing up your car. It cost bucket loads. It'll all come together over time....unless I win the lotto

[zebra]

Tell me about it...Im going a t78-33d on stock ECU and injectors due to blowing a turbo the other day....will be babying it for a while

[Rolls]

There was a really nice piece of kit someone was using on here, individual cylinder EGT probes, basically comes with a special gasket that they are part of. Wasn't cheap though, something like $1500 for it and the data logging hardware/software it came with.

[Room42]

Grrr I uploaded the wrong video.

Here is the right one.

http://www.youtube.com/watch?v=ZCG9jTJozuM

Edited October 23, 2011 by Room42

[zebra]

wheel spin much