Now that I have my RB in and running for awhile, I would like to find out the full potential just from tuning it. I am talking about putting it on a dyno and adjusting whatever needs to be adjusted. I have never done anything like this so I would like to get some information on what can be done. Now I am just talking about a stock RB25det with fmic, and exhaust for bolt-ons.
When I get it dynoed, do they automatically adjust the timing to its max potential? What else can they adjust? Approximately how much cash should I expect to spend?
I would adjust the timing myself but I would not know whether to advance or retard just by butt-dyno. Sorry if I appear ignorant but I have never done anything like this. Also do I need to take it to a shop who has experience in RB's? I tried asking McKinney's but their site is down for now.
Thanks.
rb tuning
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skillzilla
- Posts: 655
- Joined: Tue Jun 08, 2004 4:32 am
Basically, getting your A/F ratio to as close to 12:1 as possible seems to be the general concensus for power/detonation on turbo cars. This means it is rich enough to keep detonation out of the picture, but lean enough to provide power. Timing can be adjusted, but Ive never done that on an RB so I have no idea passed the 15 degrees that comes stock. There is also boost to think about, finding out what the efficiency point is for your turbo (point where bell curve drops and no real power is made after the boost is raised). This will keep your turbo happy. You can also tweak the fuel points if you have a AFC or similar unit to make the A/F at the 14:1 normally aspirated level until the turbo spools, then drop to 12:1 to combat detonation. This will give you more off-boost power and make your turbo spool quicker.
Normally, dyno tuning takes ~$400, but can vary HUGELY based on the tuning you want to do, number of pulls needed, and shop to shop.
Normally, dyno tuning takes ~$400, but can vary HUGELY based on the tuning you want to do, number of pulls needed, and shop to shop.
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frosted flakes
- Posts: 410
- Joined: Tue May 13, 2003 9:02 am
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I just want my timing adjusted and my engine running to its full stock potential. At least they could tell me if I am running too rich or lean or something. I don't expect them to hack into the ECU at all.
Maybe they can diagnose the problem I have with my engine that feels like a limiter. Around high 5's-6k rpm it feels like surging. My af meter shows rich and my boost doesn't show it increasing anymore. So I just shift to a higher gear and it pulls hard again. This is really why I want to get the dyno.
Maybe they can diagnose the problem I have with my engine that feels like a limiter. Around high 5's-6k rpm it feels like surging. My af meter shows rich and my boost doesn't show it increasing anymore. So I just shift to a higher gear and it pulls hard again. This is really why I want to get the dyno.