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Whats the reason for the difference

wwe_champion
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wwe_champion Newbie

wwe_champion

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Gday all, i just have a question. My mate and i both have 180sx and both have RB20's in them. Mods wise they are very similar in that there isn't really any. But when we are travelling at similar speeds are revs are very different. E.g when im doing 100km/h my car reads out that im doing 4500rpm while my mate at the exact same speed is only doing 3500rpm and they are both in 5th gear. Could anyone tell me the possible reasons for the difference in revs and could this be a problem.

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sewid Grand Master

sewid

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Posted
im sure he knows what engine he has :D

they both got swapped for rb20's by the sounds of it. Sorry i cant help ya mate

yeah youd think so, but he said he and his friend have no mods.

why would you go through the effort of swapping the SR20 for the RB20 anyway? If you were going to swap to an RB you would at least go for the RB25.

dojobi Experienced

dojobi

Posted
Posted

Just to check that the tacho isn't wrong (as 1000rpm seems like a huge amount more for a 4.3 diff over a 4.1 one), do the engines sound the same when they cruise at that speed? I mean does your one actually sound like it's doing 1000rpm more than his? Since yours is slower, it does sound like your diff isn't some super high ratio one.

wwe_champion Newbie

wwe_champion

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Im not the most knowledgeable when it comes to the mechanical side of cars, but can someone please explain what the difference is with the diff ratio and how it effects the car. Is it related to the gear ratio. Im sorry if this is a dumb question but i don't really know. Tah

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