JMC

Wow, that is fantastic :notworthy: Luvvin the Megaview as well 8)

Here's a new one. I've plotted the boost pressure from my old toothed belt system (pulley about 67mm AFAIK), and my 65mm pulley (both on my old head and block and with a vernier pulley), vs the 68mm pulley on my new head and block (and no vernier). Excuse the lines - they are a bit rough and ready as they are averages of a few runs. Now I've been wondering abou this. Boost pressure for a given system is really a measure of how inefficient that system is at flowing gas (the more the blockages the higher the pressure), so here's the question.... If the new system (the 68mm pulley with a 1.9l engine and 4 branch manifold) flows gas more efficiently, I would expect the boost pressure to actually be lower than the old 1.8 engine, with the original manifold and 65mm pulley, but it's to be higher (especially as the charger is spinning slower)?? Please can someone one with more thermodynamics knowledge come forward as my brain hurts :confused4:

Not sure on the VRs but on the G60 it is the black one next to the blue one. There is a small clip which just pulls out to the side, and then the sensor pulls out. Do it when cold though - the last you need is hot coolant everywhere. Hopefully one of the VR boys will be along soon, but I would also suggest the search

Which Corrado is this on mate? On my G60 the black temp sender (next to the blue one on the front of the block) is the one which measures the water temp in the dash, but not sure if this is the same on the others...

I suppose this is the reason why the boost retrun is supposed to give a slight increase in power - no recirculating of already heated air back into the supercharger. Shame the noise and oil vapours in the engine bay really wound me up to the point of putting the pipe back on. Must be getting old :lol: I like the idea of the fuel cooler. Seen that suggested before in the book "How to build a fast road car" as one of the recommended upgrades for supercharged cars (although oddly enough it didn't mention it for turbo'd ones :shrug: ). The more I read peoples comments and the more I think about this, brings me back to finding the best way of monitoring air temps at different points along the intake...

Hmm, is that the stock Corrado G60 intercooler Yan? I'm running a Golf FMIC, and have cut away half my bumper to get more airflow. I wonder what that is rated as reducing the temps by? I think temp measurements are going to have to be done, and thanks for the comments and ideas guys. Keep 'em coming :D More airflow through the engine bay is the way forward - stil convinced of that (on top of charge cooling with either water, methanol or nitrous of course). Remove ambient hot air more efficiently and the temps of everything come down. When the air is stagnant then all the heat sinks in the world aren't going to do you any good....

My G60 does that. It seems as though there is a slight leak where the coolant pipe goes into the block - corroded flange or something like that. Basically I have to top up the coolant every few hundred miles, until I get round to changing the flange.

No, I haven't got a standalone oil feed. Done a bit of digging into the background of those, and it seems they were first developed for the G40's not to cool down the chargers, but to deal with the high oil pressures blowing seals. I can see in principle how they work for the G60's, but my oil rarely gets above 85 degrees now (with the 19 row oil cooler) even on the motorway. Also with the standalone systems, they are themselves going to suffer from heat soak, as they are sat in a nice hot engine bay - the ones I have seen so far haven't got external coolers on them. The phenolic gasket is something I do like the sound of. But even with that, with everything sat in a nice hot bay when in use it will all equilibrate, but intrigued to hear what you say boostmonkey that it makes that much difference. I am hoping the group buy for Schimmel water/methanol goes ahead, as this should be a very efficient way of cooling the system. You're welcome dirtytorque. The scientist in me likes to share data and try and understand what is going on. Far too often do we try and make decisions based on peoples opinions who have never even tried using equipment, but recommend it because they heard a mate talk about it in the pub. Not planned on taking it to any quarter mile events really, just trying to build something which is fun, and an exercise in seeing what is possible wih the right setup, but I'm sure if the occasion arose then I might be tempted to do a sprint :D

Interesting though that all the subsequent runs are about the same, and there is such a huge difference especially low down. I don't have a phenolic gasket on there - I was told at the time by an eminnent engine builder that they were not worth it. Beginning to wonder now :? The rolling road set up at Surrey Rolling road uses a 'large' fan directly in fron tof the car. As you say, not the same as the road, but even so, it moves plenty of air.

The fuelling goes a bit lean above 4000 as it stands at the moment, so there is some improvement to be had there. Lower down it looks pretty good though, so I don't think I'll be messing there. The oddest thing though. If you look at the runs I've done from originally getting the car, the 1st run on any given day is always drastically different from the subsequent ones. There is huge amounts more boost pressure lower down, and as a result masses more torque, but this disappears and after the 1st run. Every set of data I've looked at for mine does this. I wonder whether others get this too, but as you normally only see the last power run, you wouldn't normally see this. I was thinking heat soak, and still am really (even with my new openned up bumper), as I can't think what else it would be :?

For those of you who are like me (geeky) I've been able to pull together rolling road info on the old vs new engine. On the graphs are wheels values for power and torque for my old engine (before the rebore), new engine just after running in and on a safe map, and finally after it has been mapped. Still think there is more to be had in the mapping, so fingers crossed...

My usual run on is at most 5 mins, even after a hard drive (and I have a low temp stat and rad switch).

Grrr, seems to be the time of year for this type of problem. Just been adjusting my Variant 1's and guess what - everything was fine until the last one which wouldn't budge :censored: Soooo frustrating, having to go back and put everything else back to how it was....

There is a tab to select 'upload attachment' and you can put your pics in there :D

Currently running on a 68mm one mate :D

Yep, still got my old Piper 285 (which I believe is actually a 276 degree cam, due to some weird naming convention from Piper). Overtaking is fun :D , and that much torque makes one lazy - there just is rarely any need to change gear apart from running out of revs :lol:

Cheers mate. Here's the graph for you boostmonkey...

It does go some boostmonkey, especially as it's coupled to a Peloquin. The torque curve is not really flat, so it creeps up from 3000 to where it peaks, but the main pwerband is from 3000 to 5500. I'll get a scan of it up when I get home. There is still a little more to get out of it, and Darren is refining the map, so there might be another 5bhp and lbft to get. Even now though, as a scientist I can't stop fiddling. I see in the group buy section there is a buy for schimmel water/methanol injections systems on. Me thinks I see the next toy :D

Just a quick update - made 225bhp (6300rpm) and 200lbft (at 5000rpm) at Surrey Rolling Road this week. :D but there seems to still be a bit more squeeze out of this above 5000rpm as the fuelling starts to lean out to much at the top end. So hopefully a bit more to come :D :D

Yeah, it wil mate - I am just waiting to get one, that ropey old 7 slat is just a stand in one (don't worry, it wasn't some weird fashion statement).

G-werks mate. Depending on where you are in London it will take an hour or 2 to get to them. They can turn it around in a day, so take it down one saturday if you can (but book first as saturdays are very busy).

Good to see you again too Supercharged, and to meet Yan too. I wouldn't worry about the delays to my day - a day out at G-Werks is always a good day out :D

Yeah it is Greg Howell, Kev. Great workmanship and a really nice chap too. There's a Golf G60 FMIC behind there, and I was always frustrated with the conventional bumper as it blocked of air flow to half the intercooler and rad. This seemed to be the right way to rectify that.

Just waiting on a new 3 slat coming through - the old 7 slat is just a stand in grill until then, and it should look alot better with the new one. And yes, banan0r, he does do that. He's based up in Southam which is up the M40 and about an 80 mile trip from where I am (J13 M25), but is well worth the journey.

Just wanted to day the front bumper that Greg at Southam Bodies made for me is absolutely first rate (see the attached). Grafting in a 3 slat grill and making it look as though it has just come from the factory. Great guy to deal with and amazing workmanship. Would definately recommend if anyone is thinking of bodywork...