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S15 SR20DET BlackTop Compression - Hardtuned.net

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S15 SR20DET BlackTop Compression 

S15 Blacktop compression results test
5 replies to this topic

#1 Dyzzii

  • Joined:14-November 17
  • Location:Other
  • Car:S15 200SX

Posted 14 November 2017 - 03:32 PM

Hey guys! This is my first post here but I really needed some clear answers. Have tried googling but everyone seems to have red-tops for this.

Anyway, I was about to dump some money into my car (front mount, cams, ecu, injectors etc) but decided to do a compression test first to make sure everything was good.

The car has done 95,000kms (both body and original motor). However my compression results have slightly worried me as they seem to be seriously low.

Cylinder 1: 122PSI
Cylinder 2: 121PSI
Cylinder 3: 119PSI
Cylinder 4: 119PSI

This was done on a hot motor (driven around for around 30 minutes then tested straight away) with the throttle fully open. They are next to perfectly even across the board but am just concerned with how low they are. The car drives perfectly, does not feel sluggish, no hesitation on boost, doesn't burn oil etc. Just has me a bit concerned now is all.

What do you guys think?

#2 S15 sxytime

  • Joined:18-March 09
  • Location:Australia SA
  • Car:S15 GT spec R

Posted 14 November 2017 - 05:43 PM

Is the gauge accurate??

#3 6330

  • Joined:18-February 05
  • Location:Australia WA
  • Car:S15

Posted 16 November 2017 - 03:05 PM

You should do a dry and then wet compression test to get a better idea of the health of the engine.

#4 pmod

  • Joined:13-May 10
  • Location:Australia NSW
  • Car:Fruity 180sx

Posted 17 November 2017 - 08:22 AM

Also remove all the spark plugs when doing the test and hold the throttle open full; comp tests need to be done with no restrictions. Also, be sure to remove the fuel pump fuse (obvious).

Here's something for you to measure against:


Youtube ftw.

#5 pur40m

  • Joined:16-February 05
  • Location:Australia NSW
  • Car:180sx

Posted 30 November 2017 - 06:24 PM

Depending what cams its got will affect the test results

#6 chris_c30

  • Joined:29-December 12
  • Location:Australia SA
  • Car:s14a 200sx

Posted 01 December 2017 - 09:28 AM

View Postpur40m, on 30 November 2017 - 06:24 PM, said:

Depending what cams its got will affect the test results

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