supercharging an 8v gti

[Khare]

honestly i would just get a 07 plate 1.25 fiesta 

well you go and do that then...

[Mikester]

But if you want to supercharge an 8v gti, buy mine and do it

[bored_Welsh_lad]

wow bored welsh lad, awesome info there! As you can tell by the thread I'm looking at spending under a grand by running low boost. For under a grand I could do this and that is the whole aim of the project, lots of ponies for under a grand. I'll speak to DH and see what he thinks, he did recommend using wideband, so I'll talk to him bout this and also to Danny, see what he thinks. Either way I'm gonna buy a complete engine on eBay and stick new seals and gaskets on it and port and polish the head. I'll stack headgaskets to relief pressure on the engine. I was thinking of sticking some ARP bolts on that engine anyway.

Right i will lay out what i think you can get for under a k if you shop around...

1.Charger M45 100-150
2.Management 2-300
3.Brackets 30-50 if you make them yourself
4.Belt 10-15 quid
5.injectors 50 quid (i picked up standard g60 injectors)
6.wideband 170 quid (new on ebay with guage(i got mine for 100 second hand)
7.Pipework 80 quid (can get second hand cheap)
8.Recirc 50 quid (load of the forge ones float about on forums)

Just another point worth noting.. the head seems to choke up at around 5000rpm and if you run a boost gauge you will see 10psi but thats the backpressure due to the head not being able to flow the boost.

I am hoping to see around 170 horse with the setup above.. if i do head towards a smaller pulley i will be running 2 gaskets and max of 10 psi..

below is the compressor map



and if you dont know how to read them, then check out this article..

Bimmer guide

[Khare]

nice one dude. So you are saying that with 2 HG's I can run on 10psi with stock internals? I'm sticking some ARP bolts in there however.
What gearbox will you be running? DH recommended the cable change off a seat toledo 16v.

When you say pipework, do you mean that runs from charer to manifold and to TB?

What about intercooler? 5/6 psi is not enough to need one is it?

[bored_Welsh_lad]

nice one dude. So you are saying that with 2 HG's I can run on 10psi with stock internals? I'm sticking some ARP bolts in there however.
What gearbox will you be running? DH recommended the cable change off a seat toledo 16v.

When you say pipework, do you mean that runs from charer to manifold and to TB?

What about intercooler? 5/6 psi is not enough to need one is it?

Toyotec is running 2 head gaskets on his valver turbo with no issues running the original head bolts from the car.. he says they handle the power no problem and the rumours about stacking gaskets is bullsh!t.. he said to check to see if g60 gaskets are the same as the 8v ones as they are steel lined...

pipework i mean from the tb to the charger inlet, the charger outlet to.. (intercooler) intercooler to inlet manifold...

with regards the intercooler, i have tried to limit the pipework so have run 2 1/4 pipework from the outlet into a charge cooler and then into the inlet manifold.. hope this helps

btw.. if your looking to get 10psi off a smaller pulley i would invest in headwork.. your best bet in the man in the shed on Cgti.

[Mew]

This is only what I've read over the years and admittedly I've not seen any proof, but apparently the mk2 8v head flows better than the mk3 head. How about looking into the use of a mk2 head inc inlet manifold and 4 branch exhaust?

[Khare]

This is only what I've read over the years and admittedly I've not seen any proof, but apparently the mk2 8v head flows better than the mk3 head. How about looking into the use of a mk2 head inc inlet manifold and 4 branch exhaust?

Interesting. I'll try and find some proof or do further research on it. The 1.8 head has smaller valves though, would that affect performance at all?

And yes I think G60 gaskets are steel lined, I'll look into them.

What intercoolers are available?

[Horney]

The 1.8 head has the same size valves AFAIK.

Nick

[Khare]

The 1.8 head has the same size valves AFAIK.

Nick

Ah ok, I'll look into it then 

[danny_p]

for dealing with the CR

1) leave it standard but fit aquamist 50/50  water methanol mix,  keep the water part injectted to about 25 % the volume of petrol injected at any given point

2)  ABA pistons   cheep but finding a gd 2nd hand set is a pita as they have to come from the states.
3)  2 headgaskets  MLS ABF ones each extra gasket is about 1 compression point
4)  g60 block comeplete


ECU . with ms you want ms2 thats where the development is happenign the cup is fater and can do more. also the maos are bigger ( unless you runign extra code ) then there about the same.

intercooler.  that woudl be from a sprinter van

charger.

M45 woudl praobly be just ok on an 8 valve but pritty pointless on a 16v  you need some high pully ratios  meaning charger will make lots of noise heat generaly be inefficent and wear out.  M62 is better even if it's just doing the same job but the revs will be lower meang less noise more efficency and longer life