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R32 Gtst Exhaust Problem

r32gtstJ

By r32gtstJ,
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r32gtstJ Enthusiast

r32gtstJ

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hello all i'm new to the world of skylines since i just got my 1990 skyline gts-t

Here's the intro.

i love my new baby but it hasn't been a smooth ride, took abit of work to get to where i am now, the car had a new motor and gbox put in done 80k and 20k but soon after i ran into problems such as limp modes :P and rough idle which i've fixed (for anyone who is wondering it was caused by faulty cam angle sensor, ignitor and afm) which took me nearlly a month of searching since it was a very intermittent problem.

so far i have installed apexi pod, new coilpack and sparks(non branded), took the cat out, put 3" tube instead and but a hks style muffler on. alot more planned but due to $ i have to fix my probs first.

Now the car is running much better than start but i have another issue thatwas bothering me,

when i turn the ignition on, the car starts runs slightly rough and suddenly rpm rises and falls back down to about 1000-900 which i heard was normal on rb engines, (correct me if i'm worng), might get a good earth kit and split fires to fix that

but

my main concern is in the exhaust, (the car had been outside in the rain in wonter for about 2 weeks when it went to the garage) now i didnt notice it b4 but when i changed the muffler to hks type the exhaust sound seems irregular, for example it doesnt keep a constant tune all the time, it sometimes makes a very very soft pop? pulse, change in pitch dont know how to describe perfectly.. sorry... then goes to normal sound and suddenly changes sound again and so on, as if its blocked which i checked but wasnt.

and also since taking the cat out it seems to make more smoke out of the exhaust, not thick but normal exhaust smoke whitish colour is this normal? just condensation? since it's been abit wet these days?

i havee searched high and low but maybe its normal for skylines? what could be the issue with my exhaust sound? is it supppose to sound abit irregular? any input would be much appreciated thank you for reading my long post.

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r32gtstJ Enthusiast

r32gtstJ

Posted
  • Author
Posted
hello all i'm new to the world of skylines since i just got my 1990 skyline gts-t

Here's the intro.

i love my new baby but it hasn't been a smooth ride, took abit of work to get to where i am now, the car had a new motor and gbox put in done 80k and 20k but soon after i ran into problems such as limp modes :P and rough idle which i've fixed (for anyone who is wondering it was caused by faulty cam angle sensor, ignitor and afm) which took me nearlly a month of searching since it was a very intermittent problem.

so far i have installed apexi pod, new coilpack and sparks(non branded), took the cat out, put 3" tube instead and but a hks style muffler on. alot more planned but due to $ i have to fix my probs first.

Now the car is running much better than start but i have another issue thatwas bothering me,

when i turn the ignition on, the car starts runs slightly rough and suddenly rpm rises and falls back down to about 1000-900 which i heard was normal on rb engines, (correct me if i'm worng), might get a good earth kit and split fires to fix that

but

my main concern is in the exhaust, (the car had been outside in the rain in wonter for about 2 weeks when it went to the garage) now i didnt notice it b4 but when i changed the muffler to hks type the exhaust sound seems irregular, for example it doesnt keep a constant tune all the time, it sometimes makes a very very soft pop? pulse, change in pitch dont know how to describe perfectly.. sorry... then goes to normal sound and suddenly changes sound again and so on, as if its blocked which i checked but wasnt.

and also since taking the cat out it seems to make more smoke out of the exhaust, not thick but normal exhaust smoke whitish colour is this normal? just condensation? since it's been abit wet these days?

i havee searched high and low but maybe its normal for skylines? what could be the issue with my exhaust sound? is it supppose to sound abit irregular? any input would be much appreciated thank you for reading my long post.

found a slightly better description,

idles fairly smoothly as per normal however you can feel these low-pitched subtle pops/thumps coming out of the exhaust which you can feel while sitting in the car. when you drive it doesnt jump around or miss or anything but kinda bothers me, anyone have any idea what this is?? please help!

Chibs Community Regular

Chibs

Posted
Posted

Hey man... exact same thing with mine.... But i dont find it to be a problem?

The RB20DET is a tad old and i would imagine a "SEMI" rough start up in the mornings is normal? It vibrates and does a bop bop bop bop bop bop in a very low tune.... rev shoots up to about 2000 then down to 900.... then bop bop bop bop bop.... until it has warmed up!

After about 3-5 minutes the engine has warmed up a bit and it is up and running ready to hit boost ! the drive is perfect up until the next time you start the car in the morning...

Let me know if there is something wrong with that.. haha because i find it normal...

r32gtstJ Enthusiast

r32gtstJ

Posted
  • Author
Posted

yeah sounds real similar to mine, in the initial start it's abit rougher than i want it to be but if its normal then i guess i cant complain,

do you get the low thumping noise from exhaust after you're in idle as well? like normal tone..... then suddenly thump...normal then thump thump then back to normal again, kinda sounds like it's missing? or blocked or something, the cars rpm is steady though, doesnt jump up and down or anything... hmmmm i wonder if this is normal as well... :ermm:

Chibs Community Regular

Chibs

Posted
Posted

Yeah it seems normal man.... My start use to be a lot worse until i replaced the battery and spark plugs...Since then it has improved a lot! but still a little rough... Not enough to phase me though

Love the 32 =D and the low tune the RB puts out... mmmh sex!

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