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Showing results for tags 'Dyno results'.
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We see it week in week out... a customer gets told the cheap Chinese coils are no different to the OEM or splitfire range of coil packs well i can tell you they are. I see at least one set of the 3 generic brands on the Australian market fail each week and here is the latest.... these are new 70-100 kilometer old ATOMIC coilpacks breaking down at 17psi. .. dropped in set new std ones and a set of 40,000km old splitfire coil packs and bingo 80rwkw gain...
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Hi all, Have pulled together some info from the RB25 dyno results thread. Only considered some of the more common turbo options (for more data points), and have focussed on those which are internally gated. Turbos looked at were: HKS GT-RS HKS 2835 Pro S Hypergear SS1PU GT3071 Was originally going to do 3076 as well, but didn't find a whole heap of examples where internal gate was still used. Have put together two plots. One shows peak power vs boost, and the other shows some dyno curves. Dyno curves are approximate, as I only read off a handful of points from posted images. Also recorded a bunch of dyno curves in km/hr but cbf trying to convert as not aware of different drive ratios between RB25 variants (e.g. Stag vs Skyline). Might dig some more in the info later to see if any other trends (e.g. for intercooler types), but nothing was immediately obvious. Some observations from myself: You're not going to see benefits of the bigger turbos (e.g. 3071) unless you push higher than 16 psi. Those with cams seem to be consistently at the top of the range. i.e. cams are good. Best results were had with Neo engines, but also some strangely poor results with GT-RS. SS1PU looks very good, shame there wasn't more results. Strongest mid range from 2835 Pro S Some possible conclusions: If you only want to run 16psi, stick with GT-RS (GT28) sized turbos. If you want max mid range (3-5,000rpm) smaller turbine is better. GT3071 really shines > 5,000 rpm, and needs boost. No groundbreaking insights here. There's obviously a heap of other factors that come into play too, but hopefully is of some interest.
