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| Forum name | Performance/Engine |
| Topic subject | Speed/RPMS |
| Topic URL | https://forums.2gnt.com/dcboard.php?az=show_topic&forum=i5&topic_id=125909 |
125909, Speed/RPMS
Posted by PDUBS, Jun-02-09 07:33 PM
What RPMs is my motor supposed to be at when im doing 60 in 5th gear? I only ask because i think my enigne is running like crap so if someone could let me know that would be great
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125921, RE: Speed/RPMS
Posted by wordsarize, Jun-03-09 09:44 AM
around 2000-2300 rpms i believe?
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125922, RE: Speed/RPMS
Posted by Warmage12, Jun-03-09 11:05 AM
I do 70 around 3000-3200 and 50 is a dead 2000 in 5th, so you should be about 2400-2600 at 60.
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125923, RE: Speed/RPMS
Posted by wordsarize, Jun-03-09 11:08 AM
hmm.. i guess my tach is off then? cause at around 3000-3200 rpms im doin 80
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125924, RE: Speed/RPMS
Posted by CODE4, Jun-03-09 11:37 AM
Keep in mind tire and rim combination will alter results.
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125925, RE: Speed/RPMS
Posted by wordsarize, Jun-03-09 12:00 PM
got stock 16" rims n tires on
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125926, RE: Speed/RPMS
Posted by justins71, Jun-03-09 12:00 PM
and transmission, manual vs. auto (tcc) and if there's the 3.55 swap... i assume you have stock though. go in the spec section and get the gear ratios, measure your tire height then google rpm mph calculator and fill in the blanks
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125927, RE: Speed/RPMS
Posted by barza21, Jun-03-09 04:06 PM
Try this out, if IIRC you should use 24.5 as your tire diameter.
http://car.race-cars.net/calculators/mph_calculator.html
That will give you a good idea.
There was a discussion the other day on chat about the mph that the tach shows on our cars. Supposedly the tach is not 100% dead on, there is some % of error, that being said I dont know if the calculator takes that % of error into consideration though.
Either way it should give you a really good estimate.
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