412 replies to this topic

[cheese-lobber]

Why are you running so scared? The power to weight ratio in the VX will always be superior.

Edited by cheese-lobber, 28 January 2005 - 10:37 AM.

[Jon]

Is the conversion suitable for other Vauxhall 2.2 engined cars such as the Astra? or is this an exclusive to the VX220?

We have taken measurements, we are pretty sure it will fit the Vectra. We just need to confirm a couple more dimensions for the Astra 4 however we are hopefull.

[Flanners]

Slurp. Well up for this!

[Jon]

This all sounds very 



I know all prices aren't fully worked out yet but i was just wondering, if a customer (must start saving up) was to have the 230hp conversion upgraded (i just said upgraded ) to the BIG one, would the cost be around the difference in the two guesstimated prices, or would it be a new management£ £ system or suchlike?

Hi Sam yes the conversions should be using the same ecu, so the upgrade should be the around the differance between the kits. However a sports exhaust (especially the front pipe with sports cat) will be required for the higher powered version.

[Jon]

Would the belts be easy to source &easy to fit, & how much would they cost?

We will keeps belts in stock, I have not had the exact price on the new heavier duty continetal belt, however typically a multi V belt is £17-20 pounds.

[stevevx220]

Jon Do you recomend using a lightened flywheel with this supercharger? Steve

[Jon]

Jon

Do you recomend using a lightened flywheel with this supercharger?

Steve

Hi Steve, you don't have to have one, however the engine will accelerate quicker with one installed, I will be putting one in my car, as I love the way the engine feels & revs with the light one fitted.

[SPLAM]

Hi Sam yes the conversions should be using the same ecu, so the upgrade should be the around the differance between the kits. However a sports exhaust (especially the front pipe with sports cat) will be required for the higher powered version.

It all sounds to good, can't wait.



The girlfriend is telling me we need a new kitchen though, yeah right!

[Mutt & Jeff]

How soon do you think you'll be able to get some performance figs up? 0-60, 0-100, standing 1/4, 30-70 & some in gear would be great! Doug

[Jon]

How soon do you think you'll be able to get some performance figs up? 0-60, 0-100, standing 1/4, 30-70 & some in gear would be great!

Doug

Alex will probably give us the first indications, the kit for my car is under way I should have this in the next few weeks, so hopefully in about 6 weeks I should have some figures.

[Mutt & Jeff]

Thanks Jon....looking forward to them!

[paulf-cam]

I am graph-boy, behold a new graph! This one plots the NA's torque curve against the Hitec SCed VX, a VXT and a stage2 VXT. I've coloured the NA curve green to match my envy at the thought of all that extra torque

Attached Files

•  newoverlay.jpg   54.56KB   0 downloads

[paulf-cam]

Oh, um and i converted Nm back into lb ft... just because. Cheers, Paul.

[Jon]

Nice curves! A persuasive argument not to go to the dark side, not to mention the better acceleration from the lower final drive of the NA.

[paulf-cam]

Its interesting to note (looking at those graphs) that the "stable" torque region on the VXT vs the chipped VXT seems to have narrowed from ~2.5k - 5.5k to ~2.75k - 5.25k. I imagine that this range is the one you want to be in to avoid nasty spikes spinning you off the track/road (unless you're in a straight line). Interestingly, the NA curve just seems to have been amplified with no loss in rev range over which its stable - is this a charactistic of a supercharger vs a turbo that we're seeing here? Of course, i may be completely wrong, not being particularly mechanically minded Cheers, Paul

[#2177]

We are seeing two effects: The SC is more stable in the low rev limit as it is constantly delivering the same level of boost, if demanded. The turbo has to build boost and limit it though the waste gate, it may need a little higher revs to get there. The effect at the upper end is just the effect of the "small" turbo. It has not been designed to build higher pressures at the upper end. If you would build in a "bigger" turbo, you would not see that break down at higher revs.. THe SC can build boost levels up to 1 bar. wth the 0.72 bar , that is is used for this application it is far away from full load, the limiting factor here is the engine, which cannot take higher amounts easily without blowing away. #2177

Edited by #2177, 30 January 2005 - 01:05 PM.

[paulf-cam]

THe SC can build boost levels up to 1 bar. wth the 0.72 bar , that is is used for this application it is far away from full load, the limiting factor here is the engine, which cannot take higher amounts easily without blowing away.

Do you know what the limiting factor is with the engine (i.e. the thing which would break at higher boot levels)? I seem to remember someone mentioning (i think it was dude) that the 2.2 has weak combustion chambers in the head...?

Cheers, Paul.

[Whiteboy]

I thought it had would break con rods first.

[SPLAM]

I am graph-boy, behold a new graph!

Mild mannered paulf-cam eats a banana and becomes...

Graph-boy

Is it a bird? Is it a plane? No, it's Graph-Boy.


Excellent work Graph-Boy.

[paulf-cam]

Excellent work Graph-Boy

I thought it had would break con rods first

I guess what I'm getting at is, whether the engine can be modded to take even more boost safely from the SC or if it would just be 'too' expensive...?