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Re: Project Cobalt Candy [Re: Golfpro] #1670152
14/02/2024 08:29
14/02/2024 08:29
Joined: Dec 2005
Posts: 12,293
Sandhurst
Begbie Offline
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Sandhurst
Wasn't it due to there being a built in oil restrictor?


Originally Posted by Jonny - After being taken out at Spa
Your car is Usain Bolt with wellies
Re: Project Cobalt Candy [Re: Begbie] #1670154
14/02/2024 09:26
14/02/2024 09:26
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Golfpro Offline OP
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Originally Posted by Begbie
Wasn't it due to there being a built in oil restrictor?

the new G series definitely comes with restrictors already installed, but I think they always needed to be added to DBB GT series turbos.

As an aside, should we not move these discussions to the Discussion thread cop


Simon
Re: Project Cobalt Candy - Discussion [Re: Golfpro] #1670188
15/02/2024 17:18
15/02/2024 17:18
Joined: Aug 2021
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Nearly finished now smile

Turbo and new downpipe and oil lines fitted.

Full service including new timing belt, water pump, aux belt fitted.

New performance radiator fitted.

Just need to get on the dyno for a mapping tweek, then we will see how it compares with the old turbo smile

Attached Files
IMG-20240215-WA0000.jpg (111 downloads)

Simon
Re: Project Cobalt Candy - Discussion [Re: Golfpro] #1670195
15/02/2024 22:08
15/02/2024 22:08
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Posts: 960
Drakelow
Jamiepm Offline
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Be interesting to see the power delivery after the dyno session

Cheers Jamie


She's alive!
Re: Project Cobalt Candy - Discussion [Re: Golfpro] #1670361
26/02/2024 17:17
26/02/2024 17:17
Joined: Sep 2006
Posts: 17,037
FCSS 01684 593187
Countrycruising Offline
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Sorry I posted on your build thread so can a MOD delete that?

Good numbers, is that dip clutch slippage....?

Last edited by Edinburgh; 26/02/2024 21:41. Reason: deleted:)
Re: Project Cobalt Candy - Discussion [Re: Countrycruising] #1670363
26/02/2024 17:24
26/02/2024 17:24
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Originally Posted by Countrycruising
Sorry I posted on your build thread so can a MOD delete that?

Good numbers, is that dip clutch slippage....?

Yes that is what my guys thought. Maybe too much torque or maybe the clutch plate is due for renewal (after all I think Nigel gave it a good workout over the years!)


Simon
Re: Project Cobalt Candy [Re: Golfpro] #1670365
26/02/2024 19:04
26/02/2024 19:04
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Jamiepm Offline
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That’s a fast car


She's alive!
Re: Project Cobalt Candy - Discussion [Re: Golfpro] #1670366
26/02/2024 19:25
26/02/2024 19:25
Joined: Sep 2006
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FCSS 01684 593187
Countrycruising Offline
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Originally Posted by Golfpro
Originally Posted by Countrycruising
Sorry I posted on your build thread so can a MOD delete that?

Good numbers, is that dip clutch slippage....?

Yes that is what my guys thought. Maybe too much torque or maybe the clutch plate is due for renewal (after all I think Nigel gave it a good workout over the years!)


Yes Nigel wasn't shy when using all the power, lol

Re: Project Cobalt Candy - Discussion [Re: Golfpro] #1670368
26/02/2024 19:42
26/02/2024 19:42
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Golfpro Offline OP
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I have roughly drawn the new figures onto the old graph to show the difference in spool-up.

Hp generation seems to have improved by 500-700 rpm, but the torque generation is on a different planet shocked

Attached Files
Dyno Comparison.jpg (86 downloads)

Simon
Re: Project Cobalt Candy - Discussion [Re: Golfpro] #1670391
28/02/2024 08:40
28/02/2024 08:40
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I picked up the car yesterday afternoon and got to test it for about 10 miles of country roads on rhe way home driving

The car now feels substantially quicker smile

It doesnt seem to reach boost threshold much quicker (maybe a couple of hundred rpm), but when it does come on it goes from zero to full boost in about 1500 rpm shocked

So previously the power would build progressively as the revs rose, but now it has a massive wave of torque from 3500 rpm that propels the car to warp speed cool


Simon
Re: Project Cobalt Candy - Discussion [Re: Golfpro] #1670392
28/02/2024 11:02
28/02/2024 11:02
Joined: Dec 2005
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Drakelow
Jamiepm Offline
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Drakelow
Sounds awesome, enjoy


She's alive!
Re: Project Cobalt Candy - Discussion [Re: Golfpro] #1670410
29/02/2024 17:07
29/02/2024 17:07
Joined: Aug 2021
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Golfpro Offline OP
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I did some road testing today to record the boost response in the real world.

The turbo starts to spool around 2200 rpm
2500 rpm = 0.18 bar
3000 rpm = 0.39 bar
3500 rpm = 0.90 bar
4000rpm = 1.72 bar cool


Simon
Re: Project Cobalt Candy - Discussion [Re: Golfpro] #1670413
29/02/2024 17:40
29/02/2024 17:40
Joined: Dec 2005
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Jamiepm Offline
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Drakelow
What gear Simon?


She's alive!
Re: Project Cobalt Candy - Discussion [Re: Jamiepm] #1670414
29/02/2024 17:49
29/02/2024 17:49
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Originally Posted by Jamiepm
What gear Simon?

4th gear from about 30mph.


Simon
Re: Project Cobalt Candy - Discussion [Re: Golfpro] #1670418
29/02/2024 23:07
29/02/2024 23:07
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Jamiepm Offline
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Drakelow
Impressive


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Re: Project Cobalt Candy - Discussion [Re: Golfpro] #1670420
Yesterday at 10:13
Yesterday at 10:13
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Golfpro Offline OP
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I have plotted the dyno Hp and road test boost results onto the G25-550 compressor map.

The first x is 2500 rpm, the last 6000rpm.

As you can see it runs nicely in the efficiency islands until it is pretty much maxed out at 6000rpm.

I guess with that much torque available there is no real requirement to rev it out to the redline anyway smile


Attached Files
Last edited by Golfpro; Yesterday at 10:14.

Simon
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