Supercharged 306 GTi6

Pants · 23 May 2007 at 19:43

Arggggggggggg I want another GTI6!

Very nice car that, I love it. I think the GTI6 can handle a lot of power because the main think I thought that was lacking was the power in mine. It felt like the rest of that car could handle more.

Gaverick · 23 May 2007 at 20:02

Look what i found

http://www.youtube.com/watch?v=mUSymvjHDRA

penski · 23 May 2007 at 20:33

Bear said:
Odd with nigh on 400bhp that car surely must be running some serious boost on the supercharger yet I hear no whine at all.

pressure...not boost...

boost threshold....CANOFWORMS!

*n

Stellios · 23 May 2007 at 22:27

WOW, what i would give for a go in that beauty. Makes my 1.4 look likes its not bothering to do anyhting at all

Never though you would be able to get s supercharger on a gti6, but its obviously doable. Any ideas of how much that cost him as its the first ive heard of a supercharged 306.

Jonnycoupe · 23 May 2007 at 22:33

Does his have any sort of LSD? Pretty critical for that sort of power :cool:

The new Jackson Racing kits seem to be using the Rotrex units.

penski said:
pressure...not boost...

boost threshold....CANOFWORMS!

*n

WTF.

Boost is any pressure above atmosphere, no need to be so anal.

TripleT · 23 May 2007 at 23:55

Stellios said:
WOW, what i would give for a go in that beauty. Makes my 1.4 look likes its not bothering to do anyhting at all

Never though you would be able to get s supercharger on a gti6, but its obviously doable. Any ideas of how much that cost him as its the first ive heard of a supercharged 306.

He did most of the work himself with help from a few friends in the industry but still quite a bit of money I'd imagine, heart over head definately :cool:

He said he would manufacture kits if he got 5+ people doing it as otherwise it wouldn't be worth it. Think I heard it would be around £5k-£6k now he knows what he's doing

Very tidy job and has been running reliabily for a quite a while now. This is on a 90k engine which had the cam belt let go previously! And on the standard clutch :eek:

(Think he's uprated it now though)

Edit - Found the spec list here

Jonny ///M · 24 May 2007 at 00:11

Hmmmmma ton 40......interesting. I would rather have a vid of the road to get a sense of how quickly it pulls away from cars etc. I dont see the fun in looking at a speedo. :confused:

silversurfer · 24 May 2007 at 00:29

I was going to say the same thing, the MPV in front was drifting towards the barrier at one point, he was so concerned by the racket behind

s0ck · 24 May 2007 at 00:46

It looks stupid quick from the speedo.
What's the gearing limit on the '6? Looks like he was at 7k, assuming it was in 6th.

adam cool dude · 24 May 2007 at 00:54

TripleT said:
He did most of the work himself with help from a few friends in the industry but still quite a bit of money I'd imagine, heart over head definately

He said he would manufacture kits if he got 5+ people doing it as otherwise it wouldn't be worth it. Think I heard it would be around £5k-£6k now he knows what he's doing

Very tidy job and has been running reliabily for a quite a while now. This is on a 90k engine which had the cam belt let go previously! And on the standard clutch (Think he's uprated it now though)

Edit - Found the spec list here

Does that mean he is looking to make this mod available to the masses? Ive driven a lot of front wheel drive cars and nothing can beat the handling of the 306 in that bracket. Plus the engine in the Gti-6 is so lovely too especially at high revs. That thing must be mental ^_^. The engine sounds soo good in that video. I want one

Btw i think he needs some new clocks now

Also got any pics of under the bonnet?

Gibbo · 24 May 2007 at 08:38

adam cool dude said:
Does that mean he is looking to make this mod available to the masses? Ive driven a lot of front wheel drive cars and nothing can beat the handling of the 306 in that bracket. Plus the engine in the Gti-6 is so lovely too especially at high revs. That thing must be mental ^_^. The engine sounds soo good in that video. I want one

Btw i think he needs some new clocks now Also got any pics of under the bonnet?

Hi there

I've driven the 306 GTI-6 and the Rallye version and where I agree its a damn find handling car, its twitchy however at higher speeds. To say its the best handling FWD car I would disagree. I would rate the 106 Rallye as better, fair enough not as quick but even more chuckable. However I personally rate the Integra Type R as superior to them both and is the car I rank as the best FWD handling vehicle.

Gaverick · 24 May 2007 at 09:07

I've been doing a bit of research and apparently 7300k rpm in 6th gear is 160mph.

TripleT · 24 May 2007 at 09:10

adam cool dude said:
Does that mean he is looking to make this mod available to the masses? Ive driven a lot of front wheel drive cars and nothing can beat the handling of the 306 in that bracket. Plus the engine in the Gti-6 is so lovely too especially at high revs. That thing must be mental ^_^. The engine sounds soo good in that video. I want one

Btw i think he needs some new clocks now Also got any pics of under the bonnet?

I guess that's the idea, he's put so much time, effort and money into it would be a shame not to. Although having one of a kind would be kind of sweet

Like I said he needs interested numbers first though and it's pretty expensive! As much as I love mine I couldn't justify throwing that sort of money at it. If I won the lottery then definately

There's a couple of engine shots on page 2 of the first thread, I would re-host but I'm at work so can't sorry.

penski · 24 May 2007 at 10:29

Stellios said:
Never though you would be able to get s supercharger on a gti6, but its obviously doable. Any ideas of how much that cost him as its the first ive heard of a supercharged 306.

you can fit a blower to almost any engine...its all about the right application of the right blower and running the right pressure.

Jonnycoupe said:
WTF.

Boost is any pressure above atmosphere, no need to be so anal.

'boost' is just a symptom of a restriction in your engine.

superchargers supply pressure.

anal or not, I just dislike the whole "omgz 'as it got boost innit!?" thing.

*n

Bear · 24 May 2007 at 10:36

penski said:
'boost' is just a symptom of a restriction in your engine.

superchargers supply pressure.

anal or not, I just dislike the whole "omgz 'as it got boost innit!?" thing.

*n

It was hardly in the context you are saying it in was it and considering the gauge you measure that pressure is usually sold as a boost gauge, its hardly an "omgz 'as it got boost innit!?" thing as you say.

penski · 24 May 2007 at 11:18

Bear said:
It was hardly in the context you are saying it in was it and considering the gauge you measure that pressure is usually sold as a boost gauge, its hardly an "omgz 'as it got boost innit!?" thing as you say.

it wasn't a dig at you...merely taking the opportunity to have a mini rant.

*n

silversurfer · 24 May 2007 at 11:27

penski said:
you can fit a blower to almost any engine...its all about the right application of the right blower and running the right pressure.

Sure most cars might take a light pressure turbo but he hasnt done that. He must have uprated the internals so hats off to him for getting it right?

I think theres only a few great engines where its just a case of upping the air pressure and it just makes a ton more power without problems

penski · 24 May 2007 at 12:45

silversurfer said:
Sure most cars might take a light pressure turbo but he hasnt done that. He must have uprated the internals so hats off to him for getting it right?

I think theres only a few great engines where its just a case of upping the air pressure and it just makes a ton more power without problems

nope.

most engines made in the last 20-odd years (excluding something made in china out of anchovy tins with 3 bearings and a hollow crank...) will take 6-7psi of pressure from a positive-displacement supercharger without raising a sweat. Above this figure, you will need to look at an intercooler or chargecooler. A lot of modern engines will take around 10psi of pressure on stock internals...

the important thing to realise is that you aren't chasing peak bhp figures or boost. The goal of this exercise is to increase overall power and driveability, and to increase the area under the torque curve.

what you are trying to do is get the engine operating at 130 percent of volumetric efficiency across as much of the rev range as possible. look at the power graph for a stock engine...now ignore the bhp curve and look at the torque curve.

you will notice that it will have a defined 'peak' at one point in the rev range. at this point, the engine is operating at (or close to) 130 percent of VE.

what you do then is note what rpm this point is and then consult the pressure map for your particular blower. Using this map, you find out what rpm your blower needs to be spinning at to produce 6-7psi of pressure and also what pulley ratio you need to run.

So now you know what pulley ratio you need to run so that your blower will give 6-7psi of pressure at 'peak torque'.

Once you have the correct pulley ratio, you need to 'simply' fabricate blower mounts, intake ducting, outlet ducting, a plenum chamber, establish the belt run et cetera.

The end result is that your torque curve will flatten and move upwards (increasing the area under the curve). You should see an increase of around 30 percent in terms of bhp across most of the rev range and, most importantly, the engine will be much more driveable with a nice fat spread of torque.

I think that covers most of it...

*n

The_One · 24 May 2007 at 19:03

Heres the engine bay

hominid · 24 May 2007 at 19:58

This car is from my area as it flew past me last sunday morning as I was out for a early morning drive. Sounded very nice as it passed me then bounced off the rev limiter..

I checked it out on the RAC registration number checker and it can back as a GTI-6 1998cc, but I knew it was something more special than that.

Nice.