Engine Sounds Like It's Going To Die

[PoppinJase]

Hey All,

I have an r33 gtst s1 - recently I've put on a new 3076 turbo with a 4inch intake pipe. I have yet to get injectors + fuel pump so I've just been putting around. Anyhow was driving home when I had an issue with the crank angle sensor which has now been fixed..

The issue is ever since that happened I get a screeching type of sound that comes in and out (not sure but could be metal shavings) and everytime i come to a near stop the engine sounds like it is going to cut out although it doesn't

does anyone know what the issue may be here? or what that sound is?

[PoppinJase]

sorry just going slightly off topic here but my back aerial isn't going down at all, would love to get it down, any help?

[Harey]

Finish off your mods and get a tune asap! Too hard to diagnose from the info provided.

[DVS JEZ]

Check all the belts.

Does it only go to die when the aircon is on? Maybe the air con compressor is starting to seize

[75coupe]

list your mods...

how did you expect a new larger turbo to go without getting other supporting mods?

and without getting it tuned?

please tell us you have a tuneable ECU or af control of some sort...???

[PoppinJase]

i wasn't expecting it to "go" or planning on trying to do that without supporting mods.... injectors + fuel pump should be here within the week.

3' xforce exhaust

vipec v44

greddy fmic

gt3076

basically crank angle sensor went and had that fixed but ever since that there has been this winding sort of noise which hasn't gone away yet..

[89CAL]

Did one of the washers for the CAS fall into the timing covers? Or anything else when you did the CAS?

Hard to say without seeing. This is just a guess as it's the last thing you touched before it went wrong

[PoppinJase]

Nah I don't think so aye, also checked the belts and all that is sweet - while I was checking everything I noticed my exhaust was leaking though? it was leaking from the front so i lifted the car to make sure everything was tightened up and it was...

after turning the car over I had a closer listen and noticed the winding sound is actually coming from the exhaust, I just can't seem to find what the issue is and why it is leaking when everything is tightened.. I couldn't see any cracks either

[TiTAN]

i wasn't expecting it to "go" or planning on trying to do that without supporting mods.... injectors + fuel pump should be here within the week.

3' xforce exhaust

vipec v44

greddy fmic

gt3076

basically crank angle sensor went and had that fixed but ever since that there has been this winding sort of noise which hasn't gone away yet..

map sensor + turbo change + no tune = silly.

map sensor has no way of knowing airflow like an AFM system and a turbo change will throw the tune out.

[PoppinJase]

I got a tune as soon as I got the ecu, I was able to take the airflow meter off and stick on 4 inch intake pipe because he had been mapped.. does it still throw that tune out because I've got a new turbo on there???

[75coupe]

are you asking, when you install a new turbo do you need to have it re-tuned?

- new ECU and you got it tuned everything fine

- new turbo and 4" intake & tune not adjusted

- CAS issue and now you have problems

is that the order in which things have happened??

Just trying to verify the steps along the way

[TiTAN]

I got a tune as soon as I got the ecu, I was able to take the airflow meter off and stick on 4 inch intake pipe because he had been mapped.. does it still throw that tune out because I've got a new turbo on there???

a map sensor relies on the overall setup staying within a small margin of difference, a different turbo is not a small change to the system. get your tune checked it could be massively out.

on my car the difference made by having it tuned with VCT off and turning VCT on in some points made what was 14:1 now 15-16:1 AFR.

[PoppinJase]

yeah that is pretty much the order that it all happened..

I see so it leans it out alot...

thanks for the advice guys, i think i know what the issue is now and definitely the solution - ta. i'll let you guys know how it goes once it's all finished and whether or not I am still having the same issues