84 replies to this topic

[LewisT]

Looking to improve the performance of my VX I got a VX NA and want to get a bit more power of it, but on a budget, i got the sports exhaust with the car so dont really wana upgrade to the miltech, but does anyone have any advance and predicted BHP upgrades of some useful products for my.
Cheers guys and gals

[Dave]

Change the colour of your car. Try Calypso or rabiata

Morrocon Red whats that all about then

In all seriousness do search for AMD regal etc or have a general browse.

Dave

or try here for a start

http://www.vx220.org...t=ST&f=9&t=6454

Edited by Dave, 22 March 2004 - 06:19 PM.

[LewisT]

The colour is sorted, truth is I havent even seen my car yet, picking it up on saturday, dad picked it up for me, so i'm yet to see the thing!!! Colour will be mint, just not happy about this power thing. Needs more power, I wana be trouncing the porkers around my area!!!

[Foxy]

The colour is sorted, truth is....

Hummmmm........think you can get a Corsa in that colour

Would that be the one in Derby??

[LewisT]

It would indeed be the one in Derby! Got it saturday, there apparantly was two people from this owners club there, thats where i found out about it! They gave my dad some useful advice on the car, was it you??? Anyway I thought Silver was the corsa colour of choice

[LewisT]

Am I right in thinkin if you could take the power of the NA up by a bit, the power to weight will be better than the turbo. Seen as the turbo weighs in at 930kg compared to 875kg. Also is it possible to get that gorgeous turbo spoiler on a NA engined car, been lookin at MS design but its a bit much, prefer the subtly of the turbo. Should have bought a turbo really!!!

[P11 COV]

I've got the sports exhaust, add a cheap induction £60, AMD remap £300, remove the pre cat (free if your'e into DIY) and you have 170+ BHP. - thats 16% hike in power from standard.

[VIX]

add a cheap induction £60

But which one?

[cheeky_chops]

I wana be trouncing the porkers around my area!!!

Dont hold your breath!! I've got a 175bhp 173lb/ft and had a boxter S pull a lenght on me up to 80

And a new carrera got two lenghts infront up to 60!!!

[P11 COV]

add a cheap induction £60

But which one?

Mines a PiperX

[Jim_Cross]

You'd need a pretty aggressive map to see 170bhp with the Vauxhall Sports Exhaust and a cheap induction kit, neither of which add any power (if you buy a cheap cone filter you might actually lose 1-2bhp, especially in hot weather). The pre-cat will give maybe 3-5bhp, so you'd then need another 20bhp from the remap . Bearing in mind the best results seen for the NA from a remap exhaust and filter is 175bhp, and that's with a Milltek and Viper giving 12-15bhp. IMO, if you do want 170bhp plus you should really deal with the breathing first, so a good induction kit and a sports centre section for your exhaust (i.e. no pre-cat and a sports cat), or at least a pre-cat replacement pipe. That should give you a better basis for moving on with remaps etc later. But that's just my opinion, and obviously depends on budget etc

[WoodenDummy]

You can normally only ever pick 2 of the 3 - Power/Cheap Cost/Reliability I think you probably picked the wrong car if you wanna drag race anyway, and the Boxster and VXT will always make more torque I would think.

[Purebob]

LewisT you need to get a Scooby STi or an EVO 7 to beat the porkers in your area. In a VX you'll just be having more FUN than the porker drivers in your area ! Seriously, you are getting the WRONG car to easily whoop all comers. Even the more powerful turbo needs skill and experience to master. Get yerself a powerful r4lly rep and whoop everything easily matey ! You'll only be disappointed by the VX or even VXt if that your prime objective.

[LewisT]

True, i suppose it will be more fun although... it nice on those long B roads with the swoopy corners, when you get that boxster with the Poser in it, all over the back of you, to put your foot down and pull away, then when you get to the corners to whoop him good and proper. You must have had occasions of someone wanting to push you, and thinking, DAM i just need more power. Thats all i after, I want some more power to reduce the chances of gettin a good whippin of some young playboy in a boxster!!!

[MRK30]

I've got the sports exhaust, add a cheap induction £60, AMD remap £300, remove the pre cat (free if your'e into DIY) and you have 170+ BHP. - thats 16% hike in power from standard.

Mmmm..personally I think this is a little generous .

Normal remaps offer between 7-12 bhp but with these figures, you're expecting more like 15-20 bhp from a remap to achieve the 170+ mark...without Cam work and the rest, I think you'll struggle (IMHO).

Courtenay reckon you'll see about 30bhp increase with their CS3 package which includes full exhaust sys inc. sports cat (not just back box) + Cams, airbox mods, filters & remap.

I don't mean to question you P11 COV, if you have this then lucky you, I just don't think 170bhp is the normal return from just backbox, remap & induction

[da_murphster]

Why not remove all the CAT's, get induction kit then remap? You should only need a cheap replacement pipe, it'll sound mounsterous, should definately breath easy! You might not be able to sleep at night knowing about all the rainforests snuffing it! Con's - engine light will trip, MOT's will involve sticking cat back on. I reckon you could do all this for £400 (if fitted yourself) Anyone any idea how must a cat (even a 200 cell sports one) restricts power?

[Jase_MK]

I don't mean to question you P11 COV, if you have this then lucky you, I just don't think 170bhp is the normal return from just backbox, remap & induction

Don't forget he has the pre-cat removed as well. I would say performance gains to be had from an aftermarket centre section are roughly 70/30 attributable to pre-cat/main cat. So removing the pre-cat gives you most of what you'd get from a sports centre section anyway.

This is based on nothing more than my hunch and opinion but looking at results people have had over the last year, there seems to be little difference in performance gain between a pukka centre section and DIY pre-cat removal. The only actual difference is the less restrictive main-cat but I would say that the gain to be had from this is small in comparison to the gains to be had from pre-cat removal.

Again, this is purely my interpretation so I could be wrong - but looking at RR figures from the AMD day and so on would suggest this.

To test this theory, I should have Piper backbox and pre-cat removed in time for the next RR day on my NA. Does anyone attending the RR day have a full Milltek on their NA without remap, induction etc to compare?

[LewisT]

Ok, so i got the sports exhaust off vauxhall, if i get the precat removed, add a filter, (the viper one as expensive as it is) and get the AMD stage 1 remap, what sort of figures are we lookin at here, is it going to be noticable power increase, and is it still going to be drivable as my car is going to be used every day. Had it picked up this morning, still not seen it, getting desperate to get back and play. (study in london, live in manchester) got to wait till saturday!!! Talk about wishing your life away

[Jim_Cross]

I would say performance gains to be had from an aftermarket centre section are roughly 70/30 attributable to pre-cat/main cat

I think Thorney said that the main cat is the most restrictive part of the existing exhaust system by some margin. Thorney - have you got the figures for pre-cat/standard cat/sports cat from AmD?

I'd be very surprised if a pre-cat removal saw even half of the 9-11bhp claimed by the Milltek.

[Jase_MK]

I would say performance gains to be had from an aftermarket centre section are roughly 70/30 attributable to pre-cat/main cat

I think Thorney said that the main cat is the most restrictive part of the existing exhaust system by some margin. Thorney - have you got the figures for pre-cat/standard cat/sports cat from AmD?

I'd be very surprised if a pre-cat removal saw even half of the 9-11bhp claimed by the Milltek.

I know that's been said, but I'm just going on what I've seen and picked up over the last year.

For instance I remember I think PaulB acheiving similar sorts of gains with full Miltek on his NA (before he started his more recent serious upgrades) as a few other people with just pre-cat removed - around 155bhp. These were all tested on the same RR day at AMD under the same conditions etc.