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Subject: "Speed/RPMS" Previous topic | Next topic
PDUBSJun-02-09 07:33 PM
Member since Nov 25th 2008
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#125909, "Speed/RPMS"


          

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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Replies to this topic
RE: Speed/RPMS, wordsarize, Jun-03-09 09:44 AM, #1
RE: Speed/RPMS, Warmage12, Jun-03-09 11:05 AM, #2
      RE: Speed/RPMS, wordsarize, Jun-03-09 11:08 AM, #3
           RE: Speed/RPMS, AdministratorCODE4, Jun-03-09 11:37 AM, #4
                RE: Speed/RPMS, wordsarize, Jun-03-09 12:00 PM, #5
                RE: Speed/RPMS, justins71, Jun-03-09 12:00 PM, #6
                     RE: Speed/RPMS, barza21, Jun-03-09 04:06 PM, #7

wordsarizeJun-03-09 09:44 AM
Member since Nov 23rd 2008
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#125921, "RE: Speed/RPMS"
In response to Reply # 0

          

around 2000-2300 rpms i believe?

  
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Warmage12Jun-03-09 11:05 AM
Member since May 24th 2008
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#125922, "RE: Speed/RPMS"
In response to Reply # 1



          

I do 70 around 3000-3200 and 50 is a dead 2000 in 5th, so you should be about 2400-2600 at 60.

95 RS sold...

  
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wordsarizeJun-03-09 11:08 AM
Member since Nov 23rd 2008
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#125923, "RE: Speed/RPMS"
In response to Reply # 2

          

hmm.. i guess my tach is off then? cause at around 3000-3200 rpms im doin 80

  
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AdministratorCODE4Jun-03-09 11:37 AM
Member since Nov 23rd 2003
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#125924, "RE: Speed/RPMS"
In response to Reply # 3



          

Keep in mind tire and rim combination will alter results.

---

2012 2500HD LML

  
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wordsarizeJun-03-09 12:00 PM
Member since Nov 23rd 2008
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#125925, "RE: Speed/RPMS"
In response to Reply # 4

          

got stock 16" rims n tires on

  
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justins71Jun-03-09 12:00 PM
Member since Oct 25th 2007
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#125926, "RE: Speed/RPMS"
In response to Reply # 4

          

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

/>

'95 GS w/ t3/t4b
FMIC, diy piping & RFL BOV
MS2-Extra Fuel&Spark
50 lb/hr Holley injectors w/ 1:1 RRFPR
JE 8.8:1 dish w/ Hastings Rings
Eagle Rods w/ ARP bolts
ARP Head studs
Mild port/polish head
3" custom DP/cat section, 3" PIT catback
dual MBC - 12 psi / 20psi

  
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barza21Jun-03-09 04:06 PM
Member since Oct 09th 2006
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#125927, "RE: Speed/RPMS"
In response to Reply # 6



          

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.

I wish I had blown it, believe me, I do...

  
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