Timing issues on RB25DET

[R33fourdoor]

Hi R334door' date=' I have re read this thread a couple of times and I see no reference to the A/F ratios. If you have them, can you post the power graph with A/F ratios and boost. The Microtech has air temp correction, which I assume is being used, if so a graph of that will be handly as well. That will help the diagnosis a lot.

[i']Hmmmm.....only have the shootout graph. I'll ask whether Shaun still has that data and is able to extract it from his Dyno Dynamics gizmo.[/i]

What model of Microtech is it? Are you running wasted spark? Have you paired up the injectors (ie; using 3 injector drivers)?

Yoiks......NFI?? It's a Microtech LT12 (like Matt's) but I'll need to quiz Shaun about the rest. Hopefully he'll have the answers.

I have never run a Skyline on anything other than 98 ron, it simply isn't worth it. Since you have a "free fuel" advantage, I would suggest a 20% mix of toluene (I use 10 litres of toluene with 40 litres of fuel). Don't get it on your hands or inhale it, it's not nice. One tank full and $50 on the dyno with the items above logged will eliminate many things.

Yes.....good ole Toluene!! Had alot of fun with this stuff in the good old days, building up a mates 1340cc Mini which ran a CR of 13.0:1!! It's a interesting thought and I'll look into it a bit more. As I'm stuck with this Caltex Card for the time being it may be the practical alternative for my second tuning map.

[R33fourdoor]

Thanks for the instructions on checking out the timing belt Mark, I'll definitely check this out on the weekend. Would love to eliminate it as a possibility but somehow imagined it would be more difficult!

Now I see what you mean Joel. I suppose in a way this is the hardest thing to check as the injectors need to come out and go to someone else for flow testing. I can see the sense in it and I'll definitely get this done but I'll leave it until last and check out the more "user accessible" things first.

Steve, I know what your saying mate, that was my concern also (comparing it to a standard ECU). I have a Microtech LT12 and it was apparently the second unit ever installed and setup by RPM (Lachlan "Freebaggin" I'm told was the first....but don't quote me). It doesn't appear to be a problem at this stage as the results are consistent and aren't varying between fiddlings.

I have the standard ECU but I feel that this would just introduce yet another variable. I'd rather work with what I already have and eliminate one thing after another..........but yeah, it's tempting!!

I wouldn't be suprised if I discovered something like this Ben, but I highly doubt it (couldn't be that lucky). I'll definitely know a bit more once I take some covers off to try out Mark's suggestion.

[whatsisname]

I have a Microtech LT12 and it was apparently the second unit ever installed and setup by RPM (Lachlan "Freebaggin" I'm told was the first....but don't quote me).

I believe that my car/I hold the number two spot for an LT12 install. My car and Lachlans were done back to back - sort of like sister cars AFAIK.

[R33fourdoor]

I believe that my car/I hold the number two spot for an LT12 install. My car and Lachlans were done back to back - sort of like sister cars AFAIK.

Howdy Matt,

Whoops!! Sorry if I've got it wrong......as you know I wouldn't have the foggiest idea if it were the case (never had it back then), it's just something that Shaun mentioned when I collected the car last Friday. :Oops:

He said that when he was with RPM, they had a particular naming pattern and the map name in my ECU is "RPM2R33t", so he must have figured it was the second!

:idea: How about I get Shaun to rename the map to "RPM2.5R33t" (just in case "RPM3R33t" is also on this forum)!!

Cheers.......