[a4anurag]

Issue faced: Between 1,500-1,800 RPM the whole cabin vibrates as if a subwoofer is cranked up fully. Couldn't really understand what the issue was. Initially, we thought it could be the clutch not engaging fully so we bled the system and all was good for 2-3K kms but later the ugly hum re-appeared. A bit more searching and tracing through the clutch lines we found a part on the clutch line to the slave cylinder. It is named as 'Regulator" by Hyundai but is generally referred to as the "Clutch Delay Valve (CDV)".

The valve or Regulator as per Hyundai


As per Boodmo

Did some searching on the internet about this valve and here's what I found:

Source 1

The clutch delay valve in the slave cylinder, its there to prevent transmission component damage due to slowly releasing the pressure in the slave, but make the clutch wear faster!

Taking it off will result in a:

• Bit stiffer clutch
• Better clutch response
• No more clutch slipping

Source 2

Source 3

A Clutch Delay Valve (CDV) is a one-way restrictor, located between the clutch slave and clutch master cylinders. It slows the engagement of the clutch, similar to a damped record player tone-arm, gently lowering the needle to the surface of a record.

Due to this factory device, the clutch engages the flywheel slowly, regardless of how quickly you lift off the clutch pedal. In theory, it reduces driveline shock, if an inexperienced driver dumps the clutch. In practice, it prematurely wears the clutch disc and transforms experienced drivers into novices, who cannot shift smoothly. During parallel parking, the delay can be infuriating, causing constant clutch slippage. During hard acceleration, the slippage shortens the life of your clutch. During normal driving, the first to second gear shift may be jerky, leading passengers to question your skill, as their heads bob back and forth!

Source 4

After going through all the data that I could gather, we decided to get rid of this valve so headed straight to our FNG and removed it from the system. We did this exercise when the odometer was 67,900 kms and now the odometer stands at 70,000 kms.

Battery, air filter box, plumbing and ECU removed for access


Thought of removing the valve and using this piece but decided not to as the length is more and sponginess may increase.


The valve as seen in my car


The whole line was removed from the car for easy working. The valve can be seen


Used this one that we scavenged at the FNG after a thorough cleaning. Connected the free ends to this directing it

Result: After driving it for 2,100 kms, the clutch engagement is smooth. The clutch feel is direct and smooth even in bumper-to-bumper traffic. No more juddering or jumping-like action.

______________________

Have contacted GT TunerZ, Delhi (Mr Akshay) for helping me to revert my car to stock. Reverting to stock only for checking purpose, two reasons:

1. Smoke under acceleration (2000 RPM and above) from 3rd gear onwards;
   
2. The hum as described above.

Shall run the stock for a while and then remap again after addressing the issues with Akshay's help. Modifications to the map etc with fine-tuning shall be done in the background so a better and final map can be written on the ECU.

**************

70,000 kms SERVICE

Changed the following:

• Engine oil
• Gear oil
• Engine oil filter
• Engine air filter
• A/C filter

From 60,000 kms the car was running on 15W40 engine oil (worst oil ever in terms of NVH and FE) and I have decided to not use this grade oil hereon come what may - it shall either be 5W30 or 5W40 grade. Decided to try another oil but a different grade this time - chose 5W30 as opposed to 5W40 that I was using other than the 15W40.

As per the manual, transmission oil also needs to be changed at 60,000 kms but we missed it so changed it this time temporarily till we get the correct one. We used Gulf gear oil (80W90) but that shall be drained and filled in with Petronas Tutela gear oil (75W85).

Have placed an order for it @ 99rpm.com

ODOMETER UPDATE

ODOMETER: 70,000 kms
DURATION: 26 months (Car completed 2 years on 18th October )

Since purchase, the time taken to reach this 10,000 kms milestone was the longest - 6 months (2.5 months was off-the-road due to health issues).

Signing off with some pictures of the car.

[ank.nsit]

Hi Anurag,

Why did you contact GTTunerz Delhi and not the Hyderabad dealer where you remapped the car?

Also is Akshay willing to put in the stock map and fine tune the map free of cost? Last when i talked to him he told me that they will charge money every time they flash any map.

[a4anurag]

Originally Posted by ank.nsit

Why did you contact GTTunerz Delhi and not the Hyderabad dealer where you remapped the car?

Also is Akshay willing to put in the stock map and fine-tune the map free of cost?

Had to contact Akshay as the guy who remapped my car in Hyderabad is currently in the USA that's why. Akshay is only helping me out to reach out to the person/store doing the remaps in Hyderabad. A store in Gachibowli is doing it currently so waiting for Akshay to revert on dates they are available with the K-Tag tool to read the ECU on the Creta.

Regarding the financial part, I am yet to gain full information on what could be the charges etc for fine-tuning. Shall update the thread after reverting to stock.

[a4anurag]

Originally Posted by ank.nsit

Also is Akshay willing to put in the stock map and fine tune the map free of cost? Last when i talked to him he told me that they will charge money every time they flash any map.

I spoke to Akshay regarding this and his response was - "There are no charges for going between maps."

So there is no need to pay anything if one wants any changes etc in the map.

[sujithsidhardha]

Originally Posted by a4anurag

Source 1The clutch delay valve in the slave cylinder, its there to prevent transmission component damage due to slowly releasing the pressure in the slave, but make the clutch wear faster!

Source 3 In practice, it prematurely wears the clutch disc

This was a piece of great information. Considering the above points, could this be the reason for infamous clutch issues in Creta?

[a4anurag]

Originally Posted by sujithsidhardha

Considering the above points, could this be the reason for infamous clutch issues in Creta?

Yes sir. It is one of the possible reasons.

Not sure what Hyundai decided to add that piece in the clutch line when I don't see it in other cars from Maruti etc.

[sagarpadaki]

IIRC Creta 1.6 needs 1.8 Litres of transmission oil.

While you are at it, also add a couple of tubes of Liqui Moly Gear oil additive. Makes a significant difference in the smoothness of gear shifts.

[sujithsidhardha]

Originally Posted by a4anurag

Not sure what Hyundai decided to add that piece in the clutch line when I don't see it in other cars from Maruti etc.

Seems it's interesting as per boodmo that 1600C>DOHC-MPI uses a different TUBE-CLUTCH (41631-A0900) without REGULATOR ASSY-CLUTCH. In addition majority of the clutch complaints i heard or read was from diesel users.

[a4anurag]

Originally Posted by sagarpadaki

IIRC Creta 1.6 needs 1.8 Litres of transmission oil.

While you are at it, also add a couple of tubes of Liqui Moly Gear oil additive. Makes a significant difference in the smoothness of gear shifts.

Yes, the 1.6L CRDi needs 1.7-1.8L of transmission oil. Will be filling the Petronas Tutela 75W85 oil in the coming weekend. Don't plan to add any additives though.

Originally Posted by sujithsidhardha

Seems it's interesting as per boodmo that 1600C>DOHC-MPI uses a different TUBE-CLUTCH (41631-A0900) without REGULATOR ASSY-CLUTCH. In addition majority of the clutch complaints i heard or read was from diesel users.

Yes sir. This 'regulator' is only for diesel engine model.

One can procure the petrol engine 'tube clutch' and replace it and should be a direct fit.

[a4anurag]

Forgot to upload the picture of the filters

Cabin A/C Filter


Old vs New


Changed after 25,000 kms of use


Fuel Filter


Being changed after 30,000 kms




Engine Air Filter


Item cost for 70,000 service

Engine oil - ₹2,400
Engine oil filter - ₹425
Engine air filter - ₹320
Cabin filter (A/C) - ₹500
Fuel filter - ₹1,898
Transmission oil - ₹1,134

Total - ₹6,683

[a4anurag]

Originally Posted by a4anurag

Have contacted GT TunerZ, Delhi (Mr Akshay) for helping me to revert my car to stock. Reverting to stock only for checking purpose, two reasons:

1. Smoke under acceleration (2000 RPM and above) from 3rd gear onwards;
   
2. The hum as described above.

Thanks to Akshay who helped me reach to Mr Vamshi @ RaceKraft who did help me get back to stock tune. Took a total of 60 minutes to complete the job. Observations after reverting to stock:

• Car is slow to accelerate from 1,000 to 1,800 RPM after which turbo wakes up and helps in faster acceleration;
  
  
• Mild to almost nil smoke in turbo zone during acceleration which was not the case earlier. Earlier it was thick-black smoke embarrassing me to put my foot down;
  
  
• Humming noise at 1,500RPM still present as earlier so it is not remap related.

[ank.nsit]

Originally Posted by a4anurag

Thanks to Akshay who helped me reach to Mr Vamshi @ RaceKraft who did help me get back to stock tune...

Is the GT tunerz Hyderabad center not operational anymore?

[a4anurag]

Originally Posted by ank.nsit

Is the GT tuners Hyderabad centre not operational anymore?

The guy running GT TunerZ, Hyderabad, is in the US. Not sure when he would return so I was helped by RaceKraft guys.

[sunilsoft]

Amazing thread. I am planning to buy a Hyundai Creta 1.6 Sx O as didn’t like the looks of the creta 2020. I am also planning to do a remap from Gt Tunerz as I am pretty satisfied with remap done on my polo by akshay. Did the black smoke issue resolve.

[a4anurag]

Originally Posted by sunilsoft

Amazing thread. I am planning to buy a Hyundai Creta 1.6 Sx O as didn’t like the looks of the creta 2020. I am also planning to do a remap from Gt Tunerz as I am pretty satisfied with remap done on my polo by akshay. Did the black smoke issue resolve.

Congratulations in advance sir for the Creta.

I haven't got the re-tuned map yet. Shall do it when Akshay is in Hyderabad. Currently running on stock map so smoke is nil till ~3,300 RPM. Post that it is visible in ORVM/IRVM especially under hard acceleration.