Rb20det Rev Limiter?

[R338OY]

haha that's funny. My stockish RB25DET cuts the fuel around 7000rpm but i guess it's A) safety and B)pointless to go harder as the stock turb is outta breath by then anyway.

Does it sound good over 8000rpm? I reckon it would be as angry as a Type R, hopefully angrier with an extra two pistons spinning around.

[abu]

haha that's funny. My stockish RB25DET cuts the fuel around 7000rpm but i guess it's A) safety and B)pointless to go harder as the stock turb is outta breath by then anyway.

Does it sound good over 8000rpm? I reckon it would be as angry as a Type R, hopefully angrier with an extra two pistons spinning around.

Yeah no point reving them that hard when they are stock.

They sound fair quiet on boost but once it gets up about 6,000 rpm and above you can hear the engine struggling and whining.

But again I haven't rev'd it that hard too many times so haven't taken much noticed.

I'd rather hear it on limiter!!

Edited September 11, 2007 by abu

[Green_s13]

my rev cut is about 8030rpm picked up by my profec e01 when tuning.

[MADGT4]

From what Roy has said im pretty sure his has seen 8500 on numerous occasions!

And its not like his motor is lightly tuned either.

BUt prob wait till he comes in and drops his 2c

But i feel the same as well as you guys... I remember going to Launch my car once and i forgot to put it in gear :S

I dont know what it revved to but it did make a odd noise, like not something breaking and not flutter and not my BOV... Motor still seems A-OK though!

[1400r]

about 1 min 50 in grey 4 door

[abu]

From what Roy has said im pretty sure his has seen 8500 on numerous occasions!

And its not like his motor is lightly tuned either.

BUt prob wait till he comes in and drops his 2c

But i feel the same as well as you guys... I remember going to Launch my car once and i forgot to put it in gear :S

I dont know what it revved to but it did make a odd noise, like not something breaking and not flutter and not my BOV... Motor still seems A-OK though!

Hahaha revving it on idle to 8,000 rpm odd wont cause damage if its just there and back. But constantly holding it there, or under load say in gear it will cause some damage, but depends on the situation I guess, and things such as tune.

Yep also keen to see what Roy has to say. I know he revs his motor hard on occasions but that’s tuned motor. I need more feed back on a stock motor

[abu]

I'd rev it to 8,500 rpm if it was tuned and making power that high in the rev range, no issues lol

[FATAZZ]

i've hit the limiter a few times. it just cuts out all power. just back off abit and get back on it.

mines a std rb20det auto with std ecu and my safc reads about 300rpm lower then what the tacho reads.

[Wheezy]

7992 is where my factory limiter was (according to my old R-FIT) So 7,800 sounds about sopt on.

[abu]

7992 is where my factory limiter was (according to my old R-FIT) So 7,800 sounds about sopt on.

Yeah thats what I thought.

If it kicked in 7,800 rpm that would be awesome!

Edited September 11, 2007 by abu

[acsplit]

Std rb20's with the rev limit raised to 8900 love the limiter all day long.

ps wolf ecus are shit for an rb application.

pfc remap ftw

[abu]

Std rb20's with the rev limit raised to 8900 love the limiter all day long.

ps wolf ecus are shit for an rb application.

pfc remap ftw

Any reason why WOLF is shit? Would be keen to hear the explanation behind that.

After market ECU's are only as good as the tuner, that goes for any ECUs including PFC and REMAPs.

8,900 rpm is way to high, maybe if its been modified and tuned.. but still why the fk would you rev it to 8,900 rpm?

Edited September 11, 2007 by abu

[Roy]

Hahaha revving it on idle to 8,000 rpm odd wont cause damage if its just there and back. But constantly holding it there, or under load say in gear it will cause some damage, but depends on the situation I guess, and things such as tune.

Yep also keen to see what Roy has to say. I know he revs his motor hard on occasions but that’s tuned motor. I need more feed back on a stock motor

LOL...my engine is a $600 short motor from EKW, it was built by Nissan and tuned by a built fella. But the motor is std.

As for rev limit, i would stick with about 7,000rpm and i am confident the thing will last a lifetime. If the thing doesnt breathe that well up high and drops off power, then dont rev it...it hurts your acceleration and the engine needlessly

Some thinking of mine about abusing RB20s

Dont rev the engine harder then you need to in order to fall into the meaty range of the power band on a gear change. Make sure your fuelling and ignition is on the money at the higher rpms and the engine isnt pinging. Also, make sure you are not getting your water or oil temps too high (water 95deg C and oil 100 deg C) To some that may be low but when i see those temps i tend to back off the motor and drop the revs well back to let it all cool down.

So, that all said. I have used 8,600rpm (According to PFc handset) and 1.5bar of boost in my engine. Its a credit to my tuner and the reliability of a std motor at 260rwkws. I typically run a rev limit of 8,000rpm and around 1.3bar.

You can see in the attached graph which shows rpm that even with a reasonable sized turbo the power does fall off at 7,000rpm

So i am to keep my car's revs between 5,500 and 7,000rpm as it never drops below 240rwkws. So at motorkhanas i bounce off the rev limit a fair bit as i am in 1st. Occasionally in 2nd gear. At the track i generally touch the limiter if its a slow corner and 2nd gear as i need to wait that moment until road speed actually catches up with wheel speed (touch of wheelspin)

But apart from that i generally shift up at around 7,300rpm when into 3rd and 4th gears etc etc. When at Sandown and Winton there are a few corners where if i give 2nd gear hell the cars gearing allows me to avoid a gear change and get great drive / power on exits. So when at Winton and Sandown i will up the rev limit to 8,600rpm and i get damn near it on my 2nd to 3rd shift, occassionally hitting it if i get a bit of wheelspin. But at a place like Phillip island where its all 3rd gear stuff and higher i tend to only rev it to a bit over 7,000rpm before changing gear.

So, yeh they rev nice and handle the revs and boost well. But as i want this motor to last as long as possible so i can find out how much abuse and power it can make ...i do tend to apply some logic to how i drive the thing...though most ppl think im just a butcher

This is 8,600rpm (maybe 8,800 cant remember) and 1.3bar

and a lets

[abu]

The man has spoken!

Thanks heaps for that Roy, very informative post.

Edited September 12, 2007 by abu

[bad_rb20]

my rb20 s13 is fairly stock and i hit limiter at 8500rpm, and its still on full boost

[limpus]

it might still be on full boost but if you look at your power curve it would be past peak power and be dropping off already...

[burnsie]

its 8200 ive had mine hit the limter

[abu]

its 8200 ive had mine hit the limter

Oh ok, standard ECU?

Is this your R32 stats; 165rwkw & 13.8 @ 99mph?

What mods did you do to get it to 165rwkw?

[Lukaz]

Std rb20's with the rev limit raised to 8900 love the limiter all day long.

ps wolf ecus are shit for an rb application.

pfc remap ftw

Wolf is shit for rb??? I don't think so buddy.

[abu]

Wolf is shit for rb??? I don't think so buddy.

Yeah exactly.

I am waiting for him to reply with an explanation..