kaisar1

I started my rex after a week, checked oil guage and it was at half. Filled it to full, and checked water level which was ofcourse always ok. Turn the key and it started instantly.

I had to see my sister who lives like 13kms away, half way on red light when i stopped i felt mild missing or 'like i wanna go or turn off myself' feeling on my throttle. (my FD is auto). Anyway i proceeded and on my next red light i felt everything was ok.

On my way back after 2 or 3kms on open road i felt like WOTing it, and when i kicked throttle down and 1st turbo engaged itself there was this kharrrr kharrrr kharrrr sound from the engine upto 6000 rpms but between 6000 to 7000rpms there was nothing. I felt like im gonna have a heart attack. After trying reading everything regarding a Rotary it was very worrying for me.

I kept pushing the throttle from its idle position to the floor in an instant for 3 or four times, the noise kept coming and going and later it was gone like it was never there.

I stopped my car and called my mechanic and he told me either the noise is coming from turbo or else its main pulley bearing noise cause its coming and going, loud and distinct respectively.And definately not the Rotors, sigh!!! If it was turbos there would have been a continuous creeeekkk creeekkk khaarrrr kharrrr sound and eventually they will break down if you are continuosly pushing it to the red line which i was. And thirdly its main belt connecting almost everything with main pulley.



SO what is it, im worried and ALOT.

im posting this video, which i made right after i got back home and started it again, the oil guage looks ok, engine temp is where it should be, there is no smoke at all except at 7000rpm range. But that noise at the end of WOT tick tock crack kharr is scary.

HELPPPPPPPPPPPP!!!!!! sorry my english is not that good.

[youtube]v6PRuUK3N1k[/youtube]

http://www.youtube.com/watch?v=v6PRuUK3N1k

nocomply24

bump lets get some rotor heads to help a fellow rx7 owner!

jacobcartmill

iTrader: (6)

all i heard was a slipping belt...

MrNizzles

iTrader: (5)

Being the holidays, it might be slow getting more feedback, however, I honestly don't think the problem is that bad...

What is the rpm reading when that black puff of smoke comes out and we hear that "screech" sound ?

Do you have a boost gauge hooked up? What is your vacuum reading at idle? What is the boost reading at the point of the screech sound / black puff of smoke?

It could be one of the pulleys making the screech sound, but that won't cause the puff of black smoke either.

My best guess (and I'm not a guru with these FDs by any means) would be there is an issue with the turbos, maybe a little too much play in the shaft somewhere which causes the screech and possible a very "slight" oil leak as well, causing the black puff of smoke?

I would remove the Intercooler piping and check for any significant oily deposits inside the piping (either before or after the intercooler?) that could indicate an oil leak from the turbos.

Good thing here, if it is the turbos, you could send them to turbocity.com for some work, I don't think it's too expensive, not nearly as much as all new turbos.

Sounds like your mechanic could "honestly" help you as well. Good luck, nice FD btw! post some pics if you can, the red interior looks nice!

bryant

i couldnt make out anything?

iSP33D-for-J3SUS

I couldn't make out any strange noise from the video you posted. I did see the puff of black smoke that came out your exhaust, though. Does it normally do that at WOT? I wouldn't be surprised - black smoke = fuel and we all know that rotaries love to run rich.

Have you tried letting the car idle for awhile? I know my RX7 HATES being left off for an entire week. It won't drive right until it's warmed up and even then it usually takes some "breaking in". I'm not sure why. (I own an FC - 1988.)

Maybe you just got a batch of bad gas? What octane do you normally run? That could explain the misfires and the strange idle you experienced at the stop light. I'm not sure about the khaaar noise because I didn't hear it in the video.

Awesome FD by the way! I love the interior!

Cheers,
Cody

MrNizzles

iTrader: (5)

The "screech" sound in the video occurs EXACTLY the moment you see the puff of black smoke.

Put on some headphones or turn the stereo up, you will hear the screech... though, one poster thought it could be a belt/pulley.

I think the OP mentioned this happened at anytime, even after the car had warmed up.

rpm, vacuum and boost pressure would be good to know at the moment this happens.


OMG !!! MY 100th POST !!! I'm not a NooB anymore !!!

kaisar1

Ok! well if you are infact standing by the or driving the vehicle its heard more like a metal screeching against metal in different frequency at different times you know.

kaisar1

between 6000 to 7000rpm

Dont have a boost guage. But i tried one manual/analog boost guage 15 days back and the reading was 8 psi max for both turbos.

Rich running nature of Rotaries???

yes there is a slight leak, but its almost 10% of what a completely leaked turbo shoud be.

i will do that.

Good thing here, if it is the turbos, you could send them to turbocity.com for some work, I don't think it's too expensive, not nearly as much as all new turbos.

He called me again and told me another thing that this noise could be coming from the metal flap that makes this twin turbo setup sequential. May be the bushings that hold it are loose or worn out since turbos never had a rebuilt and it rattles when the second turbo is bypassed the boost from first turbo???

Thanks for the compliments about the interior.

what do you guys think?

kaisar1

black smoke is okay, screech sound is worrying. BTW its pssssh sound from turbos at their max psi level, but screech happenes at that very moment too...

kaisar1

Well there is, and it comes loud sometimes and sometimes its just gone like its all ok. hardluck while making of this video that it wasnt too loud to be heard but you can still feel it when your video bar at youtube is between 2:10 till 2:14

you can see the idle when i bring in the cam inside the car showing the meters and guages, and idle is at its perfect settings and steady.
So have i never and ever took my FD out untill the temp guage reaches its half mark and thats where it stays while the car is running.

91 Octane. there were never any misfires, only the idle was a little hasty as i was pressing brakes while waiting for the green light with shifter at 'D'. All went normal after that.

Thank you. Thanks alot, interior was black when i got it cleared from Customs & Ports. But then a friend of mine with a Touring exchanged it cause he changed the Black color of his 93 FD to blue.

So since there were no FDs from factory leaving with Blue Body and Red interior but had clack instead, i gave him the black one from mine. And got the red one since there were Silver FDs with Red leather interior.

MrNizzles

iTrader: (5)

The primary turbo switches over to the secondary turbo around 4500 rpm, so I don't think the "screech" sound which is happening higher than 6000 rpm is caused from anything when the turbos go from 10-8-10. Though you mentioned that they are maxing at 8.

The only metal flap I'm aware of, and again, I'm not a turbo guru, but I only know of the wastegate that opens and closes. I can't imagine this making the "screech" sound, but I can definitely imagine bearings and shaft play causing it.

I guess have your mechanic run some diagnostics, check the belts and pulleys, then check the turbos and go from there.

kaisar1

let me take out the pipe coming right off the turbos to the intercooler and i will post some pics for you also to analyse it

watching some fine powdry metal debris or dripping oil or both from that elbow would be a nightmare i guess.