jon_s
10-05-2003, 09:02 AM
Yo yo yo!! I have finally got round to doing this!! Ok, this is how it goes:
There are several things you can do:
1)Exhaust
2)Manifold
3)Induction Kit
4)Cams
5)Ecoteck Valve
6)Power Boost Valve
7)Chip
1) There is so much choice out there!! Basically GMC are the best...contanct no. below. However, there are lots of others out there. Main point...go for a full system. Not just the back box. You would be looking at £200-£300 I suspect.
2)Ok there are two types of manifould for your car. Firstly 4-1 and 4-2-1. From what I have read, 4-1 is better for the VTS and the 4-2-1 is better for the VTR. Reasons: 4-1 is better for the higher torque/RPM range, and the VTS makes the most of this. The 4-2-1 is better for the lower torque/RPM range, and the VTR takes advantage of this. For a manifold to work correctly the length and bore size is critical, unfortunately most exhaust manufacturers do not follow the requirements they just join the 2 up the best they can, having wrong sizes or wrong lengths can make the engine LESS not more powerful, all GMC manifolds are made technically correct. Miltec were charging over £200, and their specs were wrong, but it looks better!! Personally I would go for a GMC 4-2-1, you will see power gains from it. A GMC manifold costs £160 plus £30 for a fitting kit. You can ring GMC on 01671-403606 (the bloke there is also a Rally Driver, and does know his shit!!) to purchase one, as well as some friendly advice! You cannot order it online, as too many people order the wrong thing. They prefere to have a chat to make sure that they are selling the right product!Also, I believe that your cat is in the manifould, so, you would have to get a cat back exhaust to pass an MOT. without the cat you would be looking at around a 10bhp increase, with a cat exhaust, you would be looking at arouund a 5bhp increase. Oh and without a cat, the car is a lot louder--Something to ask GMC--.
3)Right Induction Kits!! rule one don't get a cheap open one i.e a K+N 57i...they are all sound and no go....even less go on a hot day! You need an encloused induction kit to see some real performance increases. You can get a 'Green Encloused induction kit', BMC enclosed, also the piper ViperX. You will be looking at £200ish. You can get the Green one for £160 including post I believe from a company called S-Link. Unfortunately I don't have a contact number. p.s Demontweeks is very expensive. Also have a look on e-bay.
4)CAMS!! Oh yes! You know the prices already. You were worried about getting any increase....well, if they are the first thing you do then you wou't see much! However, if you have sorted out the breathing of the car, then you will. When I put CAMS on my car, I was really disappointed, as I saw very little in terms of gains...and they were the last thing I did. Reason...........ahhhhhhh, a little matter of running them in! After around 2-3k the engine losened up, took it back to the dyno and my little baby was pushing an extra 8bhp over the original increase 6bhp...so in total I got an extra 14bhp.
5)Just an aside: there are various debates going on about an 'ecoteck valve'. For the VTR I have heard that they can increase responsiveness at around 3000rpm, and improve fuel eco! Not bad for £60. Some people will disagree, but have a look into it.
6) These cost around £100, and are needed after CAMS have been fitted to increase the fuel pressure. pre-CAMS, you will see no difference at all!
7)Chip, I could not find a lot of info on a chip. In general it should be around the last thing you do...as it adapts to all the mods that you have done (especially CAMS) Unfortunately Chips are beyond me. I can't tell you how they make the car better, it just does lol. But they respond best after engine mods. Looking at around £100-£200 again.
Overall!!! Agruments..is it worth spending all that money?? Errr..probably not! But then I did, and I am happy with the results. A VTS engine transplant could also be on the cars....but I doubt you will go down that route. Basically, the 3 main things are the 1)manifold 2)Full Exhaust System 3)Enclosed Induction Kit. You will notice the difference with this. In fact you will notice quite a lot of difference! As for the rest. Go for it if you want to.....JUST REMEMBER THE RESALE VALUE OF YOUR CAR!! The more you do, the less it is worth, and the more the insurance will be!
Hope this helps dude!
There are several things you can do:
1)Exhaust
2)Manifold
3)Induction Kit
4)Cams
5)Ecoteck Valve
6)Power Boost Valve
7)Chip
1) There is so much choice out there!! Basically GMC are the best...contanct no. below. However, there are lots of others out there. Main point...go for a full system. Not just the back box. You would be looking at £200-£300 I suspect.
2)Ok there are two types of manifould for your car. Firstly 4-1 and 4-2-1. From what I have read, 4-1 is better for the VTS and the 4-2-1 is better for the VTR. Reasons: 4-1 is better for the higher torque/RPM range, and the VTS makes the most of this. The 4-2-1 is better for the lower torque/RPM range, and the VTR takes advantage of this. For a manifold to work correctly the length and bore size is critical, unfortunately most exhaust manufacturers do not follow the requirements they just join the 2 up the best they can, having wrong sizes or wrong lengths can make the engine LESS not more powerful, all GMC manifolds are made technically correct. Miltec were charging over £200, and their specs were wrong, but it looks better!! Personally I would go for a GMC 4-2-1, you will see power gains from it. A GMC manifold costs £160 plus £30 for a fitting kit. You can ring GMC on 01671-403606 (the bloke there is also a Rally Driver, and does know his shit!!) to purchase one, as well as some friendly advice! You cannot order it online, as too many people order the wrong thing. They prefere to have a chat to make sure that they are selling the right product!Also, I believe that your cat is in the manifould, so, you would have to get a cat back exhaust to pass an MOT. without the cat you would be looking at around a 10bhp increase, with a cat exhaust, you would be looking at arouund a 5bhp increase. Oh and without a cat, the car is a lot louder--Something to ask GMC--.
3)Right Induction Kits!! rule one don't get a cheap open one i.e a K+N 57i...they are all sound and no go....even less go on a hot day! You need an encloused induction kit to see some real performance increases. You can get a 'Green Encloused induction kit', BMC enclosed, also the piper ViperX. You will be looking at £200ish. You can get the Green one for £160 including post I believe from a company called S-Link. Unfortunately I don't have a contact number. p.s Demontweeks is very expensive. Also have a look on e-bay.
4)CAMS!! Oh yes! You know the prices already. You were worried about getting any increase....well, if they are the first thing you do then you wou't see much! However, if you have sorted out the breathing of the car, then you will. When I put CAMS on my car, I was really disappointed, as I saw very little in terms of gains...and they were the last thing I did. Reason...........ahhhhhhh, a little matter of running them in! After around 2-3k the engine losened up, took it back to the dyno and my little baby was pushing an extra 8bhp over the original increase 6bhp...so in total I got an extra 14bhp.
5)Just an aside: there are various debates going on about an 'ecoteck valve'. For the VTR I have heard that they can increase responsiveness at around 3000rpm, and improve fuel eco! Not bad for £60. Some people will disagree, but have a look into it.
6) These cost around £100, and are needed after CAMS have been fitted to increase the fuel pressure. pre-CAMS, you will see no difference at all!
7)Chip, I could not find a lot of info on a chip. In general it should be around the last thing you do...as it adapts to all the mods that you have done (especially CAMS) Unfortunately Chips are beyond me. I can't tell you how they make the car better, it just does lol. But they respond best after engine mods. Looking at around £100-£200 again.
Overall!!! Agruments..is it worth spending all that money?? Errr..probably not! But then I did, and I am happy with the results. A VTS engine transplant could also be on the cars....but I doubt you will go down that route. Basically, the 3 main things are the 1)manifold 2)Full Exhaust System 3)Enclosed Induction Kit. You will notice the difference with this. In fact you will notice quite a lot of difference! As for the rest. Go for it if you want to.....JUST REMEMBER THE RESALE VALUE OF YOUR CAR!! The more you do, the less it is worth, and the more the insurance will be!
Hope this helps dude!