Neo Rb25's Have Rb26 Rods, What About The Pistons?

[maximajim]

Has anyone experience a Ring land failure on a NEO with a proper tune? Are there any high powered Neo's in AUS?

Any pics of the NEO piston?

thanks

[Abo Bob]

I've seen a NEO with blown ringland. Can't vouch for the tune.

Sydneykid talks about one with 265rwkw stock head gasket etc.

I have 228 rwkw with an auto.

[maximajim]

Here in the US we had one making ~436rwkw before the owner decided to use 87octane fuel .

I'd like to know more about the ring lands. The neo doesn't have the same pistons as the r33. We know the problem with the r33 was it has comparatively small ringlands. I wish there was a pic comparing the two.

[Abo Bob]

Are you trying to tell us it had 436rwkw with stock pistons?

What's 87octane fuel? Beer?

[Amaru]

Theyre 87 RON would be equivilent to our 91 - 95RON (they use RON+MON/2, so their 91RON is actually pretty equal to our 98RON).

[Ronin 09]

How long was it making 436rwkW for...?

[Duncan]

I'm pretty sure there is a difference in dyno reading between USA and Aus too, I remmember seeing something on a Supra forum about it. The numbers were 10-20% higher in USA

[R31Nismoid]

How long was it making 436rwkW for...?

one dyno run man!

thats all you need to claim a reliable motor these days

[lwells]

I'm pretty sure there is a difference in dyno reading between USA and Aus too, I remmember seeing something on a Supra forum about it.  The numbers were 10-20% higher in USA

<{POST_SNAPBACK}>

I've tried to find something concrete about this (because I was bored). Do you recall if it was a calibration issue or are "US HP" a slightly different unit? Some interesting history here: http://en.wikipedia.org/wiki/Horsepower

[lwells]

I think I finally found the info. Supraforums search function is borked so its taken awhile

Duncan, is this what you are refering to? Its attributed to Todd Wilkes and would seem to be a calibration issue:

Recent dyno figures from the united states have been indicating that American engines produce more power easier than the same engine in Australia. This is in fact not the case because of recent information that has confirmed my long term belief that the Australian dyno dynamics chassis dynos are giving lower horsepower readings than the American DynoJet chassis dynos. The difference between readings is approximately 15%. Using the following example its easy to see why.

We will use flywheel horsepower as our base line and assume our engine has made 560 Horsepower on an engine dyno.

American engine builders i talk to typically have used 12-15% as a drive train loss figure because they use the DynoJet chassis dyno. And using our 560 flywheel hp figure would expect around 476 Rear wheel hp on a DynoJet chassis dyno in the USA. The problem i had with this was that my first supercharged 355 Holden engine did produce 560 flywheel hp on and engine dyno but when i put it on a Dyno Dynamics chassis dyno at summernats 12 it only produced 389 rear wheel hp! So that would indicate a 27% drive train loss taking into account the higher altitude in Canberra compared to Brisbane where i achieved the 560 flywheel hp. I decided to Email the dyno shop in the USA who had both Dyno Dynamics and Dyno Jet dynos and found that they at one stage used the same car on both dynos to see what difference there was. They agreed with my calculations which indicated that their dyno readings were apprixmately 15% higher than ours and then went on to say that they have calibrated their Dyno Dynamics chassis dyno using a 1.15 error correction factor which brings its readings up higher to equal their DynoJet chassis dyno readings!

OK so finally you can rest assured that Australian engines do produce the same power that the American engines have been.

[Duncan]

voila you are much more 1337 at this interweb stuff than I am, I couldn't find it.

[Abo Bob]

so US436 = AU379

that's still a lot but perhaps you meant rwhp which would translate to 282rwkw which is much more believable.

[USRB25S13]

I'm pretty sure there is a difference in dyno reading between USA and Aus too, I remmember seeing something on a Supra forum about it.  The numbers were 10-20% higher in USA

<{POST_SNAPBACK}>

And the cars are 10%-20% faster over here too. Kinda weird isn't it.

[maximajim]

I don't know why is when you guys see a high power figure out of an RB25 your feathers seem to get a bit ruffled. WE all know RB25's can NOT sustain this power in the long run. These engine are play toys to us and are NOT daily drivers for most of us.

IF you go into that RB failure thread it's quite easy to see that most failures are to due to: Poor Tuning and even NO tuning.

Or prehaps all of you are right and this massive turbo was all show

I also have a video of it and the owner claimed he ran a 11.9@121 with a small turbo and less power. I but it's all a lie anyway.

Edited September 9, 2005 by maximajim

[T04GTR]

Has anyone experience a Ring land failure on a NEO with a proper tune? Are there any high powered Neo's in AUS?

Any pics of the NEO piston?

thanks

<{POST_SNAPBACK}>

neo pistons have a differant pin height. pretty sure the same as prior 25s

[Scribble]

That turbo doesnt look that big but the bell mouth sure is

[R31Nismoid]

the turbo is tiny, just has a moronic wank bell mouth

[maximajim]

the turbo is tiny, just has a moronic wank bell mouth

<{POST_SNAPBACK}>

That's a Turbonetics T66. IF you think that's small I don't know what to say to you.

I expect this sort of ignorance and arrogance on american forums. I never knew I'd see that here.

[R31Nismoid]

It is small. a 600hp huffer, give or take?

Thats hardly a

massive turbo

by any means of the word

[maximajim]

It is small. a 600hp huffer, give or take?

Thats hardly a  by any means of the word

<{POST_SNAPBACK}>

Try 650RWHP... of course that's tiny on a standard RB25..