RB30 engine conversion (lots of pics)

[tarmac terror]

Thats really bad news Andy, sorry to hear about it. Loved this thread from the start and hope you get back on track soon so-to-speak.
I think money permitting I might take a stab at an RB30 should the 26 go bang. Seems to be the future LOL.

Good luck with the rebuild and keep all the good info coming

Scott

[R32 Combat]

It should only take a month or so. Everything's in place now after spending all afternoon on the phone. It's certainly a quick learning curve. At least it gives me the opportunity to make a few tweeks now its out.
There are still a few technical issues to over come, and a few mine fields out there. Hopefully, within the next year, there will be alot more parts/info on the RB30/26 conversions as more and more people play about..

[002-M-P]

Another quick question....of all the strengthened timing belts out there, could there be one that is any stronger than another or less susceptable to stretching to reduce the amount of error in the CAS sensor?

[Asim R32GTR]

Originally Posted by 002-M-P

Another quick question....of all the strengthened timing belts out there, could there be one that is any stronger than another or less susceptable to stretching to reduce the amount of error in the CAS sensor?

Have a look at this pic, it shows the what`s inside the CAS.



The big slots / gaps are for each sylinder = 6slots
The tiny tiny tiny slots are for crank position = 360slots.

Do you se how small size the crank slots are? dont have to be a astronaut to figure out how small of cambelt flex is needed for wrong timing

Asim...

[002-M-P]

Originally Posted by Asim R32GTR

Have a look at this pic, it shows the what`s inside the CAS.



The big slots / gaps are for each sylinder = 6slots
The tiny tiny tiny slots are for crank position = 360slots.

Do you se how small size the crank slots are? dont have to be a astronaut to figure out how small of cambelt flex is needed for wrong timing

Asim...

I definately understand why it is happening and that minimal flex causes incorrect timing, but I am just wanted to figure out if one specific timing belt could reduce this flex even minutely.

[Asim R32GTR]

Originally Posted by 002-M-P

I definately understand why it is happening and that minimal flex causes incorrect timing, but I am just wanted to figure out if one specific timing belt could reduce this flex even minutely.

As far as i know, it is not possible to cure this.
You could tighten up the cambelt so much that it has no play at all, but the risk of damage to the tensioner would be to big of a risk.

Could maybe get away with it on a dragcar... but no way on a road car. Tensioner would make nois, and bearing inside would be destroyd after a short while...

Asim

[ISL33P]

having also followed this for quite a while, i'm sorry to hear about the issues you are having. Hope it comes together ASAP and it running to its true potential.

being in australia and building my own rb26/30 there are numerous cars out there with this style of combination and i can quiet honestly say that none of them use a crank trigger for the ignition signal. these are cars that are making approximately 1000hp and putting down 160mph down the qtr mile. the main difference being they are using the best aftermarket computer available in the world, MOTEC. Seems like a cheap insurance when building such an engine.

The slightly larger honing for cylinders 5 & 6 appears to be a cheap, but costly (excuse the pun) fix for a problem that can be tuned out of the car if the computer/tuner have the options available, being individual injectors control and egt's probes in the exhaust manifold.

this is just something to think about, that's all.

[saladfingers]

hi do you do all the work yourself.. good one ..love the work..

[Asim R32GTR]

Originally Posted by ISL33P

being in australia and building my own rb26/30 there are numerous cars out there with this style of combination and i can quiet honestly say that none of them use a crank trigger for the ignition signal. these are cars that are making approximately 1000hp and putting down 160mph down the qtr mile. the main difference being they are using the best aftermarket computer available in the world, MOTEC. Seems like a cheap insurance when building such an engine.

The slightly larger honing for cylinders 5 & 6 appears to be a cheap, but costly (excuse the pun) fix for a problem that can be tuned out of the car if the computer/tuner have the options available, being individual injectors control and egt's probes in the exhaust manifold.

this is just something to think about, that's all.

What type of motec uses the CAS ??

And what type of fuel are these 1000hp cars using?

If they are using racefuel, then it wont be a problem. Detonation on racefuel is heavily reduced. The problem is for streetcars running pump fuel...

Asim...

[ISL33P]

uses the signal from the standard CAS.

yes they use race fuel, but why risk all those hard earned dollars (pounds) on the crap you buy at the pump. if you are going to run any serious boost figures, its the only way to go. if you drive it on the street, just select a conservative tune with little boost.

[Asim R32GTR]

Originally Posted by ISL33P

uses the signal from the standard CAS.

yes they use race fuel, but why risk all those hard earned dollars (pounds) on the crap you buy at the pump. if you are going to run any serious boost figures, its the only way to go. if you drive it on the street, just select a conservative tune with little boost.

I see.... Motec is a very good ecu, no doubt!
If i had the money i would go for one. I am currently using electromotive, wich i find has probably the best / most accurat ignition system.

Motec can probably adjust ignition scatter? and ignition on each sylinder aswell?

[ExScoobyT]

Typical internet BS relating to the nissan CAS! The problem is the AEM ecu not the bloody CAS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[Asim R32GTR]

Originally Posted by ExScoobyT

Typical internet BS relating to the nissan CAS! The problem is the AEM ecu not the bloody CAS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

How would you explain everybody`s problem when using ecu like aem, powerfc, link etc etc ?

I have seen this many times now, and hear about it all the time.

When you use it for a 400hp engine there is no problem, it is when you come up to 5-600 ++ hp, and using pump fuel.

Not every one can afford a system like motec, or run a daily driver on racefuel. Or have a HKS ecu, there is not one powerwriter in norway, so that means i have to go to uk everytime i want to change something on the map or settings etc....

Asim...

[Cord]

Originally Posted by ExScoobyT

Typical internet BS relating to the nissan CAS! The problem is the AEM ecu not the bloody CAS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I'm not saying the CAS is/isn't at blame for this particular failure. But have you any evidence that AEM ecu's aren't up to the job, or that the CAS is a good piece of kit (when used at decent power levels obviously)?

[Asim R32GTR]

Originally Posted by tyndago

I have never heard of this in the factory ECU. I will enquire into it myself. I know that at higher RPM's we see some RPM drift. The thing is that the RPM is picked up off the CAS.

The CAS is belt driven, and I think the belt moves around a little. One a 600 hp car under load, I would see the RPMS move around 200-600 rpms up and down. Thats on a new build, with a new motor. If you are on the Datalogit group - for Power FC. In the files section, there are some logs of Nicks car 11 second runs. You can see in secessive frames the RPM's bouncing.

I remember reading that Mario - Exvitermini had issues with the Motec and the Nissan CAS. I think they were seeing something similar. Big rpm movements frame to frame.

I have a Nissan CAS that was altered to run a pre- Nissan CAS AEM. They made a new wheel for it. Seemed to work out ok on that car. It did over 900 whp.

This is what im talking about....