Club G40 Forum
Technical => Turbochargers => Topic started by: dub-disaster on November 12, 2009, 10:02:18 am
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hi all,
got my turbo kit yesterday with a second hand ko3 it looks ok but can turbos be sericed or reconditioned is it worth getting this done before throwing it on the car or is it not really worth it?? Also in the exhaust side of the turbo i know its gonna be sooty but theres alot caked on carbon there does this need removing before fitting or will it just build up again ??
And finally when fitting a rothe manifold what gaskeet do you use a standard exhuast manifold gasket ??
Thanks in advance for your help :)
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-Check if the shaft "plays", also check if the compressor wheel has any damages, if there's nothing theres no reason to rebuild the turbo.
-Don't worry for the carbon, if you clean it, it's gonna happen the same
-Yes, for the manifold use a standard, but metal gasket
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thanks for your reply, no theres no play its nice and tight :) heres a pic of the compressor wheel very very minor damge but let me know what you think !! the bloke who sold it to me is sending me a new wheel is it worth changing them over and do they need balancing or anything if i change the wheel over
(http://i673.photobucket.com/albums/vv92/antywill666/DSC00508.jpg)
(http://i673.photobucket.com/albums/vv92/antywill666/DSC00509.jpg)
(http://i673.photobucket.com/albums/vv92/antywill666/DSC00512.jpg)
What do you rekon ......
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Need to be balanced if you're replacing the turbine dude- even a tenth of a gram at the speed these do (150,000rpm) makes for an unstable balance!
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does this look a lil bent on that fin labled or is it ok ??
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Can't really see from the pic Ant, they're so cheap on e-bay for a low mileage turbo I'd not bother repairing one, don't think you'd pay anymore than £50 for one :)
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ok guys thanks for your help , think ill stick this one in and if it goes bang buy a new one :)
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i doubt it will get pats the intercooler, but i just bought this off somone on here as a turbo conversion and he has had it running on his car so it cant be that badly damaged can it?? or should i send it back to him as i thought that i was getting a turbo in good conditon.
Hmmm what do to ??? think i mite find a local turbo sepcialst and drop buy and show them and ask them weather its worth sending it back for a refund or if its ok to put in the car
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Yea that's what I'm thinkign now just gitA find a reasonably local turbo company any one know of one in the south west of England ?
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I would just fit it, its very rare that they actually fail properly anyway. You just get more and more play and then oil blowby.
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Ok thanks for the advise tommo, what happens when oil blowsby?
This is on a compley differnt subject but tommo with your intercoer setup (you still using that 4x4 cossie one behind the grill?) how deep is the core as I'm Reading a book on forced induction tuning by graham bell and it says in there that the deeper the intercoer core the less the air gets through to the rad and that general a core should be no thicker than 2 1/2 inches otherwise the radiator doesn't cool aswell aswell as the back if the intercooler wich suffers aswell, but the abouve 2 1/2 inch rule applies to cars with radiators of 3inches and abouve and as a g's rad is about 1 1/2 inches I just wondered the exact depth of the cossie cooler an if you had any cooling problems with your rad receiving less air??
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obviously that's only a problem if you mount the IC in front of the radiator anyway.
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That's where I was going to mount it. Also the back of the deep. Ire wi h I belvedere to be 120mm deep is only two thirds as effective as the front due to less airflow I just wanted to check the depth think I'll go for one of the ones of eBay there about the ritght depth and bar and plate type anyway
cheers guys
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two schools of thought really.
A thinner one with a large surface area will be more effective than a smaller, thicker one, even if both have the same tube surface area. Because like that book says, the air heats up as it passes through the core so has less cooling effect towards to back of the core.
However, a big thin one which is mostly obscured behind the grill, bumper etc... will be less effective than a smaller, thicker one which is fully in the cold air flow.
so it's swings and roundabouts really and depends what you can fit on your car. If fact the radiator being right behind it will further restrict airflow too as if the warmer air can't get out of the back of the core quick enough, fresh air can't get in at the front.
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I see what you mean about swings and roundabouts, think I'm just going to get a 2-2 1/2 inch deep one that will fit in the gap at the bottom of the bumper from eBay , just outa intrest what intercooler setup do you run hayesay ??
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My rad is below my intercooler so it has no effect really. But I wouldnt worry too much, at speed my car runs a bit cold if anything, and in traffic you have your fan to draw air through.
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Ok not so sure what to do now! I can get a 4x4 cossie intercooler for £35 or pay £80 for a thinner one that I can mount rite out front rather than behind the grill as I would with the cossie one wich one would give better cooling?? Because if there both roughly the same then I won't bother paying the extra £45!! Ne ideas tommo don't suppose you eer measured your charge temp after the cooler have you??!! Whats you opinions
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buy which ever one you can fit the easiest and in the best position on the car to get as much airflow as possible.
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Ne ideas tommo don't suppose you eer measured your charge temp after the cooler have you??!! Whats you opinions
Nah, I could do with fitting some thermocouples really but I never got round to it.
Bear in mind that to fit the cossie IC I had to cut a lot out of the front of my car, and had to reposition the rad in a totally new place, with new pipework. And I lost the standard bonnet catch mechanism.
If you arent bothered about hiding it then Im with hayesey, get somthing big and get it on there.
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Thanks for your help tommo been most helpful :D
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You can hide huge intercoolers on G40s, there's loads of room at the front!
Mine:
(http://img.photobucket.com/albums/v251/Young_Un/DSC00129.jpg)
(http://img.photobucket.com/albums/v251/Young_Un/Turbo/DSC00210.jpg)
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That is pretty big man! Is that one of those custom o es you had ? Did you have to move much to get it in there? Looks nice and stealth though , cheers yoof
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You can hide huge intercoolers on G40s, there's loads of room at the front!
Not totally true Pete.
Yes you can run a large intercooler like yours if you can get one with reward facing inlet and outlet stubs. However, these aren't widely available, unless you buy a custom made or specifically made one like you have. And that means expensive.
The majority of intercoolers available (not the less reliable plastic end tank O.E. type fitted to some BMW and VW turbo diesels) virtually all have inlet/outlets facing outwards. Loads of different ones available from the shops on Ebay. By the time you put elbow hoses on the end it severely restricts the overall width of intercooler you can use. IIRC there is only about 800mm between the chassis rails, so not much room for a decent size one at all.
I think Antony is thinking of using one of these types? These are cheap enough and look pretty, but you do need a fair amount of depth and width to fit them. Most cars do have enough room, which is why they are made this way. However, the Polo doesn't - and my MK2 is far worse!
And Pete, I HATE your intercooler!!! >:( >:( :D :D
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You can hide huge intercoolers on G40s, there's loads of room at the front!
Not totally true Pete.
Yes you can run a large intercooler like yours if you can get one with reward facing inlet and outlet stubs. However, these aren't widely available, unless you buy a custom made or specifically made one like you have. And that means expensive.
If you shop around, there are OEM intercoolers with rearward facing outlets that are a similar core size to the PSD setup that Yoof uses that can be had for cheap. It's not rocket science, and compared to a lot of boosted motors there's plenty of frontal space on a Mk3 Polo for a decent intercooler.
The old PSD setup like Yoof's got is pretty good, mounts nicely, fits well, flows well and is a good size. Emtec do a similar setup with their turbo kits.
If you think a Mk2 is tight, try a Mk1. Our Polo-PP project Mk1 will have the rad in the boot and will still need a lot of tinkering to get a decent-sized cooler in.
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(http://derby.polog40.co.uk/photos/intercooler_fitted.jpg)
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Intercooler envy LOL ;D You can buy it for £450 :P
As Andy says there are several OEM intercoolers that will fit just fine, get down a scrappy with a tape measure!!
Stu 'Snow Plough' Baxter still holds the G40 intercooler record ;D
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That's mine, but it's not hidden:
(http://i427.photobucket.com/albums/pp355/doc_j/G40/012893332-big.jpg)
(http://i427.photobucket.com/albums/pp355/doc_j/G40/012898946-big.jpg)
(http://i427.photobucket.com/albums/pp355/doc_j/G40/Aili002.jpg)
I needed to cut a lot of my front bumper, but the cooler can be mount behind it if you cut small of the bumper-base. Like him:
(http://img222.imageshack.us/img222/641/mg3630ok7.jpg)
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Intercooler envy, yeah damn you Pete! ;D
Antony (dub-disaster) is haggling over paying £35 for one let alone £450!
Like I said I think most of the O.E.M. ones such as the BMW and VW tdi ones have plastic end tanks. Alright for low boost but how long it'd last with circa 20PSI is anyones guess.
I think the Vauxhall Frontera one may be all alluminium construction, but its got a very thin core and small dia. pipe stubs.
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I don't mind paying more than £35 definantly don't fancy £450 though !! What's the depth of that psd one you got there yoof??