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The std. shocks on mine started to leak after 5K miles on PI springs. I then fitted KONI adjustables and that sorted everything out. In my opinion one of the best mods for a std. 172 is uprated suspension.

Keep it all in case you need to sell the car and the person buying wants a std. one. You can also then sell you modified parts on the forum, etc.

I would go for the Supercharger if I had the money. Look at these tuning packs for the cooper S which add an additional 40 bhp to the std. supercharger setup - extra tuning potential. I reckon you would need to ditch the air con. to make space for one at the front. I remember getting a price...

Had the fortune of racing one of these on a private road. They are quick - not quite as quick as the 172 but very very close. I decided that I would follow and had too back off twice from getting close to him. 1st Time was top end of 3rd and then top end of 4th. Was rather frustrating really...

Also 30 bhp increase from Modifying the head alone?? is this realistic - what do you reckon is achieveable in terms of BHP gain?

hmmm - £1200 to have the head worked on and that includes the labour. Seems quite a bit to me. What do other tuners charge to modify a head and take it off and put it back on again?

There isnt much difference between imports and uk 172s. Alarm, rear arches seemed to be more rolled on UK cars (is variable) and I think the plaque on the sills are different - plastic/metal. The Renault Dealer I use doesnt discriminate certainly on warranty anyway.

Cups seem to put out more on the rollers and as previously stated this is down to no air con. and less power drain and possibly a different ECU program. Its not hard to change the parameters to alter timing/etc... Phase 1, Phase 2 and Cup all have different engine numbers.

I know of someone that has fitted Konig seats to their Cup.

Cups seem to put out more bhp than std. 172s which works in your favour. What id do: I would go for either a BMC or Viper with cold air feed - £150 Modify throttle butterfly - £40 Big Valve Head with all the trimmings - £???? Unichip to tie it all together £350 - £500 I reckon that...

Want another car to play with and have seen one going really cheap - like less than £300.

Opinions and Experiences of the above car please.

I wouldnt buy a Sparco strut brace - you need to move either the header tank or power steering vessel to fit it ! I think KTec might do one - that would be the one to go for as im sure you wont need to move anything - just drill the struts.

What sort of cost are you looking at to get a reliable 170 to 200 bhp on a GTT engine?

I think im correct in stating the original BMW M3 has multiple throttle bodies and that was back in the eighties !

Cats are going back on today - shame but want it so car can be seen by aRenault dealer and also not sure if any detremental effect of using a resistor.

Ill pop down Renault tom. and get the inlet manifold gasket for the 16v. Ive got a 172 one and can see if they marry. If so then you could fit the 172 manifold and throttle body. Not sure if the potentiometer plug is the same and I guess all the other pipes and stuff will fit?

So about £170 for the manifold. Four throttle bodies will cost I guess between £400 and £500. I think you can get an Engine Management system for £500. So looking at over a £1000 for parts....

Looks like the butterflys could benefit from being slimmed down at the edges to improve flow.

So am I correct in saying that the 16v Throttle body has two butterflys - a small one and a larger one? What are the designs reasons for this? Does the small one open at lower RPM giving better torque and then the larger one open up at higher RPM? Excuse my ignorance.

The Service Manager at the local Renault Dealer told me that they werent going to touch the car since I disconnected the downstream lambda sensor. He said if I got everything put back then they would look at it. Im concerned if the car is running too lean or over fueling and doing any damage...

Ive got the 172 gasket. Ill just go in and get the 16v one. They think im mad anyway as im always asking them questions out of the ordinary.

What the cons./dangers of this approach then? I asked him if the resistor was only effecting downstream sensor and the message I got back was it was effecting both. He did a CO reading and said everything was OK. Im still not 100% convinced ! The alternative to binning the decat is to put...

BenR, Any chance you can post a photo of the 16v inlet manifold ports and if you have time measure the size of them and distance between each. Im still wondering if the 172 inlet manifold would fit a valver. The plenum chamber on the 172 is quite large - 4.8 litres to be exact and if it went...

Ive now taken the decat pipe to the next level on my 172 - fooling the ECU into thinking that the rear lambda sensor (downstream) is working and I have a cat fitted to the car ! The rear lambda sensor has been removed and the 2nd hole in the decat pipe plugged. A resistor has been placed...

I got hold of a std. inlet manifold and throttle body for the 172 and took it to a well respected company. Guy there said there wasnt enough meat on the body or manifold to warrant enlarging. Although if I was racing it on the track then another approach could be taken. In the end the...

Power to weight ratio is the important thing. Thats why the 172 will keep up with cars that have more bhp but weight so much more. If you take the evo 1/2/3 these weight just over 1200 kg and have 240/250/260 bhp. Not too hard to get these motors to 300 bhp and an evo 3 will have 250 bhp/ton...

Renault Sport do a Group N ECU available for the MK1. Simon172 has one I think.

Dont they have to cut into your wiring loom to fit a unichip?

Well alot of the 172s have a very similar Torque figure - std. and modified - around the 148 figure even though some have higher bhp than others. On the road std. and modified ones are so close and much of it is down to the start you get and the drivers ability to change gear without bouncing...