how much psi - 8v?

[...joe]

if you put a g60 block in it'll be better, plenty of people have turbo'd them when the superchargers give up.

[Brads MK2 GTI]

If you want to go crazy with the standard engine and blow it up with nothing uprated or capable of handling pressure, why don't you just fit NOS? Much cheaper way of blowing an old engine!

[mic]

ok we seem to have missed a few key words here

STANDARD
8V
PSI

question wasnt about management, which engine to use, and I didnt say anything about a turbo...

each engine comes out of a production line built as stock. each tuned for efficiency etc etc etc. as you know, these engines can be tweaked a little before any major mods.

im guessing that adding a LITTLE PSI wont do any harm, after all its only adjusting the standard factory settings..... make sence? yes, 20psi might be too much, but 2-4? thats all the question is, no more, no less

[Brads MK2 GTI]

No arguments here friend, just answering your questions as best we can. No one would really know how much boost you could put through a standard engine at a guess because I would've thought that most folks would use the G60 lump or uprate internals. How would you plan on controlling the amount of boost being put through? It's also a worry that (again at a guess) your engine will have seen the plus side of 100k, and will be stuck together with carbon build up, not sure pressuring it would be a good idea at all.

[mic]

sorry dude just edited that last post! i know its not an easy 'by the book' question but i only asking about a incy bit of boost, im not after an all-out turbo as some people may suggest!

[16v]

As a very loose rule of thumb a standard engine "should" hack up to 6 psi of forced induction. For how long though is the real question. It might hack 14psi...... for a week

I've no real experience with FI on VWs so I stand to be corrected but I have a lot of FI experience with Subarus. I tuned 2 of mine to over 375bhp which were both UK spec 208bhp standard.

The garage I worked for also did the first ever supercharger conversion to a n/a Subaru Impreza 2.0 Sport in the UK.
Mad conversion but it's what the owner wanted. That was 135bhp standard and we basically just bolted on a chargecooled supercharger using the standard ECU, injectors and standard block. It ran up to 9psi and did 189bhp on the dyno. The AFR were monitored closely of course, to make sure it didn't lean out and a knock detector was fitted to monitor det. The owner wanted to see exactly how far he could go on the standard lump and was quite prepared to blow it up. At 9psi he was maxing out the OEM injectors so it was left at that but it was a significant improvement over standard.

This was on a 4 year old car though with low mileage etc etc. so although this info is in no way relevant to your car it does give you some idea I suppose.

Also different engines will hack different things. It really is impossible to give you anything other than a ballpark figure.

Take 6psi as a benchmark. It MAY hack more but it MAY also grenade itself on less.

It's a bit like asking "if I'm 24 and start smoking, what's the most no. of fags I can smoke a day to make sure I live past 60." Who knows?

Hope that helps.

[mk2mark]

Why don't you tell us where you're coming from with these questions - so far your question has been answered as well as you can possibly hope for - you asked what boost in psi can a standard 8v engine handle - we've all told you there's no real way of knowing. Having said that there's not a huge difference between a turboed engine and a n/a one so if you're deciding to go forced induction the difference between 6psi and 14 is not a whole lot.

[turbodub]

On a PB engine though you would be asking for trouble if you ran more about 7-8lbs. They are 10:1 comp ratio when they left the factory, if your head is coked up (which it probably will be) or the head has been skimmed, which on most cars it has been, then you will get some serious detonation if you used more boost than 7-8lbs as stated above.

Lets say you use a T3 turbo with a .48 exhaust housing, it will start producing boost at around 3000rpm on your motor. As the RPM rises your Digifant ignition will advance the timing more and more while the turbo is producing more and more boost and you will get serious detonation. You would probably be able to drive it for some time as VW engines are quite tough, but it really is not the best way of doing things.

You really would be better off investing in a G60 bottom end and a G60 ECU and loom. You will then be able to safely run up to about 1BAR boost safely and reliably. It should not cost you more than £3-500 for both.

[mic]

ok im debating a supercharger. i have no idea about management, or VW engines so before i start lookin into all that kind of thing and start pricing these G60 parts up i may as well see if a standard engine would be capable of running a small amount of boost.
im not gonna start to learn about management an that if i dont 'need' to. i dont wanna go pricing things up and work out a timescale/budget etc if i dont need to...
if its a simple 'should be ok to run 2-3psi ' then great, if its 'dont run any cos it'll blow' then fine, i know either way.

to be fair i bought a golf just to drive, i wasnt goin to play with it as such - main reason why i gave up on last project - i just want something i can turn the key and go. ive liked em for years but never got round to owning one till now! i dont mind changing the chip - as per my other thread - and simple things like that but thats about it

[topher]

Standard block (if in good condition) will take 6psi. Standard digifant ecu has no map sensor though... and if you're fitting a s/c you'll most likely be nicking bits off a G60 anyway.