mk 5 golf R32 - misfire
Discussion
I suppose what I should have said was, fill the tank with 95 and advance the base map as far as possible without detonation. It's normal to do that for 98/99 as you say, but with the R32 I'd prefer to play it safe when adding boost! In my experience, the difference in the timing map between 95 and 99 is usually only 3 or 4 degrees advance in the high load areas, which isn't going to add masses of extra power.
Shame the UK is sooooooo slow to embrace E85 as that is 105 octane, and has a cooling effect too. You wouldn't need an intercooler for stage 1 running that fuel. The downside is bigger injectors are required and you'll get 30% less range to a tank, but it's good stuff
Shame the UK is sooooooo slow to embrace E85 as that is 105 octane, and has a cooling effect too. You wouldn't need an intercooler for stage 1 running that fuel. The downside is bigger injectors are required and you'll get 30% less range to a tank, but it's good stuff
Yes, TRD have taken the head off and commented the block and all other internals are in good condition, therefore it `only' requires new pistons and putting back together. There is some very minor marks to cylinder 1 but nothing they can't remove with some oil stones and thorough cleaning and lubrication.
I will need to ensure the engine is bedded in properly when done and take it very easy for the first 1000 miles or so. Any particular advice in this respect? I've only ever owned second hand cars.
I mentioned other forced induction r32 owners recommended a spacer plate and intercooler and asked for comments, but the response I got was that it wasn't necessary, and not possible without other mods to existing set up. I asked why only cylinder one piston was damaged and didn't get a response. Not really going to get to the bottom of the cause without speculation. Anyway I'm looking forward to getting the car back, hopefully in a couple of weeks.
Depending on how bit performs over the next few months in still planning on taking bit on the road trip to south of France but will need to an my fuel stops wisely...
I will need to ensure the engine is bedded in properly when done and take it very easy for the first 1000 miles or so. Any particular advice in this respect? I've only ever owned second hand cars.
I mentioned other forced induction r32 owners recommended a spacer plate and intercooler and asked for comments, but the response I got was that it wasn't necessary, and not possible without other mods to existing set up. I asked why only cylinder one piston was damaged and didn't get a response. Not really going to get to the bottom of the cause without speculation. Anyway I'm looking forward to getting the car back, hopefully in a couple of weeks.
Depending on how bit performs over the next few months in still planning on taking bit on the road trip to south of France but will need to an my fuel stops wisely...
I hope they're not using a Flex Hone in a drill?? Every time I've used those on VR6 blocks (12 and 24V), the oil consumption increased markedly. The factory honing shouldn't be disturbed if you want to maintain the R32s negligible oil consumption, hence why I suggested starting over with a new engine if the cylinder walls are scratched. I would have done that anyway tbh as they're not expensive on ebay for a low mileage lump...and you wouldn't need to run it in.....
.....but anyway, they need to send your block to a machine shop who can do the honing to factory standards, but I'm sure they'll come up with a "Nah, it's not necessary...." type response to that as well.
Not trying to scare you, just sharing my experiences with this engine.
I don't understand their 'not necessary' response to intercooling and compression lowering. It's standard practice on an engine what wasn't forced fed to begin with! If that is what they are sticking to, I would seek a rock solid warranty from them before handing over any money, which sees them paying for a new engine if this happens again.
As for why only cylinder 1 let go, only one cylinder fires at a time, in a set sequence - 1,5,3,6,2,4. Numbers 1 & 6 run the hottest as they're on the edge of the block where the cooling jackets are smallest. 1 was on it's firing stroke when it was getting hot under the collar, and let go first.
It's unusual to see damage on all cylinders. One buys it, which slows the engine down, preventing further damage.
.....but anyway, they need to send your block to a machine shop who can do the honing to factory standards, but I'm sure they'll come up with a "Nah, it's not necessary...." type response to that as well.
Not trying to scare you, just sharing my experiences with this engine.
I don't understand their 'not necessary' response to intercooling and compression lowering. It's standard practice on an engine what wasn't forced fed to begin with! If that is what they are sticking to, I would seek a rock solid warranty from them before handing over any money, which sees them paying for a new engine if this happens again.
As for why only cylinder 1 let go, only one cylinder fires at a time, in a set sequence - 1,5,3,6,2,4. Numbers 1 & 6 run the hottest as they're on the edge of the block where the cooling jackets are smallest. 1 was on it's firing stroke when it was getting hot under the collar, and let go first.
It's unusual to see damage on all cylinders. One buys it, which slows the engine down, preventing further damage.
Good luck with getting it sorted, however it shouldn’t really eat a piston like that especially on a low boost set-up.
As has already been said, that points to a mapping issue, I would also question the placement of the MAF as my understanding is they are not designed to have air pushed through them (under boost conditions) I think it causes instability in the readings.
All the Turbo and Rrotrex installs I have seen have the MAF after the air filter and before the supercharger or turbo.
I have MKIV R32 with a Rotrex supercharger running at 15psi with lowered compression. I normally run on Vpower, however on occasions have had to run on 95, or even French supermarket petrol when on holiday. Never had any problems, obviously I don’t drive it hard when on 95.
The VR6 can take quite a bit of abuse as it was originally designed as a diesel. I did this to mine a few years ago https://www.youtube.com/watch?v=rgRnTJwjs9g
It had water in the cylinders as it was misfiring and steaming out the exhaust before I took the boost pipe off. I got very lucky and only damaged the MAF and throttle body, engine was fine.
If you are down south, near Surrey The Phirm in Blackwater are experts in tuning the VR6 so it is worth giving them a shout.
As has already been said, that points to a mapping issue, I would also question the placement of the MAF as my understanding is they are not designed to have air pushed through them (under boost conditions) I think it causes instability in the readings.
All the Turbo and Rrotrex installs I have seen have the MAF after the air filter and before the supercharger or turbo.
I have MKIV R32 with a Rotrex supercharger running at 15psi with lowered compression. I normally run on Vpower, however on occasions have had to run on 95, or even French supermarket petrol when on holiday. Never had any problems, obviously I don’t drive it hard when on 95.
The VR6 can take quite a bit of abuse as it was originally designed as a diesel. I did this to mine a few years ago https://www.youtube.com/watch?v=rgRnTJwjs9g
It had water in the cylinders as it was misfiring and steaming out the exhaust before I took the boost pipe off. I got very lucky and only damaged the MAF and throttle body, engine was fine.
If you are down south, near Surrey The Phirm in Blackwater are experts in tuning the VR6 so it is worth giving them a shout.
Good clip! You were lucky you didn't hyrdolock it!
Agreed, it's not normal to take MAF readings downstream of the compressor but if they've rescaled the MAF table in the map accordingly, it can work. The old Z-Engineering setups ran the MAF in the same way and they worked pretty well.
15psi through the plastic intake! The plenum likes to split open on those I wouldn't go any more than that on the boost!
Boosted R32s are great when built and tuned right.
Agreed, it's not normal to take MAF readings downstream of the compressor but if they've rescaled the MAF table in the map accordingly, it can work. The old Z-Engineering setups ran the MAF in the same way and they worked pretty well.
15psi through the plastic intake! The plenum likes to split open on those
I wouldn't go any more than that on the boost!Boosted R32s are great when built and tuned right.
This thread is too interesting to not ask for an update!
How did it go?
I’ve been looking, but it doesn’t appear that anyone offers a positive displacement charger for the R32.
I’m surprised as there is so much room for something like ESS do on the old M54B30 with cooler in the manifold.
Hrmmmm
How did it go?
I’ve been looking, but it doesn’t appear that anyone offers a positive displacement charger for the R32.
I’m surprised as there is so much room for something like ESS do on the old M54B30 with cooler in the manifold.
Hrmmmm
Mr Whippy said:
This thread is too interesting to not ask for an update!
How did it go?
I’ve been looking, but it doesn’t appear that anyone offers a positive displacement charger for the R32.
I’m surprised as there is so much room for something like ESS do on the old M54B30 with cooler in the manifold.
Hrmmmm
Hi Mr Whippy, I've just seen your other thread and recent purchase of R32. Hopefully this answers your questions....How did it go?
I’ve been looking, but it doesn’t appear that anyone offers a positive displacement charger for the R32.
I’m surprised as there is so much room for something like ESS do on the old M54B30 with cooler in the manifold.
Hrmmmm
https://www.pistonheads.com/gassing/topic.asp?h=0&...
I decided not to repair the car after the accident and let my insurers deal with it. It was placed into a salvage auction. It was bought and repaired and then sold to another person, whereby the engine died again. It was then rebuilt and was recently sold on ebay... I'm happy with a standard VR6. Due to the design of the engine, without a charge cooler they get too hot and can't cope with the boost and fry piston rings.
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