March 2011 (Uh-oh update...)
As some folks (or those who read my previous few posts) know I recently had ITB's fitted to my Trophy. It was something I had wanted to do for some time but - obviously - it took some scrimping and saving to finally pull together the pennies to get it done. I had actually thought about going down the supercharger route but, for various reasons, I decided not to - primarily because I wanted to keep the Trophy as a "Trophy" and retain the NA characteristics of the engine (plus I could not justify the additional step-up in cost). Hence, ITB's were the way to go; especially given the sort of driving I enjoy with Rebel Motorsport Club and the various events and drives I'm involved with throughout the year (not to forget the spur-of-the-moment weekend blast now and again).
But before I embark on the rest of this story and bring things up to date, I need to go back some three and a half years to the point at which I purchased the Trophy. It likely has significance on the events of recent days...
I purchased this wonderful car back in August 2007 and it was in fantastic condition. The only two negatives were that a) the brakes were knackered as the car had been stood for a while and b) the engine bay had a very ill-fitting Hillpower induction kit fitted (which had been somewhat cannibalised to fit, although the rest of the engine appeared mechanically sound). A test drive was taken and the car was purchased - no real issues whatsoever. The brakes were replaced (new pads and discs) and the Hillpower kit was removed and the standard airbox and setup reinstalled. This actually resulted in a mild performance increase (which did not surprise me given the state of the Hillpower "bits".
Despite the relatively good performance of the car (I'm talking engine performance rather than handling characteristics) it was not quite there. In all truth I didn't notice this as I had never driven a Clio Sport 172/182 before and was simply enjoying it as it was. However, a good friend of mine (Lyn/Salem) took the car for a spin - on quite a few occasions - and realised it wasn't perhaps quite as it should be. She had good experience of the Clio Sport 172/182/Trophy range to this point and I valued her thoughts on this so, naturally, was somewhat dismayed to hear that it wasn't quite living up to the performance of other stock Clio Sport's out there. It wasn't bad but she mentioned it didn't pull like she expected it to; nor did it have the urgency she expected when burying the loud pedal. A little further down the line this was confirmed by another good friend of mine (Lyn's father) who also knows his Renault's and engines (having worked in motorsports as both a mechanic and race driver in his earlier years). He also commented how lethargic it felt in comparison to the cars he had driven. Again I was a little disappointed but I couldn't be too upset as very often it would embarass far superior cars despite not perhaps being quite at the level it should be.
Over the next three and a half years I steadily modified the Trophy to get it to where it is today and can honestly say that I have enjoyed each and every mile in it... even if it hasn't perhaps lived up to the performance levels that it should. I had no complaints, no serious problems and the car is probably far more capable than I'll ever be. It's been lovingly looked after and will be in my garage permanently as a keeper. With that in mind, it brings us right back to today and the decision I made to go down the ITB route...
Having had experience of the K-Tec Racing DTH ITB kit on a friend's Clio Sport 172 (and the fact he'd been running it for some time with no problems) I decided to contact them and arrange to get the work done. I had previously been to K-Tec Racing for other work and could not fault their courtesy, customer service and for generally keeping me up-to-date on how things were progressing. They took my car in on the 12th March and kindly loaned me their 172 for the week whilst the work was carried out.
It was with a fair amount of excitement I returned on March 19th to pick her up! After exchanging pleasantries and settling the bill I was given a rundown on the work carried out and the difference I would need to be aware of compared to the stock F4R engined Trophy. No major issues there and so I took receipt of the dyno plots. Being a fairly level-headed sort of guy (old!) I had fully realistic expectations of the sorts of gains I was likely to get from the ITB's but was still surprised at the relatively low figures I was seeing. I was told that the K-Tec Racing dyno setup was very conservative but still remained a little disappointed (although the sound made me feel a bit better!) In all honesty the gains shown were healthy and I was assured that they couldn't feasibly squeeze anymore out of it; just my personal disappointment souring things a little. As I drove away I wasn't unhappy at all; it sounded beautiful, the throttle response was instant and the performance markedly improved. By the time I was home I was grinning from ear-to-ear and about 65 quids worth of V-Power lighter in the wallet. My disappointment had all but vanished.
Last Thursday I went with my club for an exclusive trackday at Llandow (sadly I wasn't running) and was showing-off the new shiny bits I now had on the Trophy. I had some great feedback and positive comments but the issue of the somewhat low results cropped up again. Something wasn't quite right. The car was running fine and better than ever before but still that result bugged me... and the comments that Lyn and her father made those three and a half years ago came back to haunt me!
As it turned out I was contacted by a good friend of mine (who shall remain nameless but nonetheless receives my thanks and gratitude) who has experience of ITB's and the related gubbins and we chatted at length about the setup, the potential issues and how I might look to resolve any problems that may exist. After a day or two of chatting, hypothesising and generally chewing the fat I decided to take a roadtrip to see Matt at Tour-De-Force in Cambridgeshire. It was a fair trek from sunny South Wales but I spoke to TDF on the phone and they very kindly got me straight in yesterday (28th March) to take a look at what was going on. Considering how busy Matt and the team are (with the race season kicking off big time) I was chuffed they could fit me in and naturally I'm very grateful.
I left the keys to the Trophy with Matt whilst my partner and I took off for a few hours in Matt's 172 Cup... which was nice... and the smoothest Clio I've ever driven
Returning several hours later I was greeted by Matt and he kindly took the time to explain what he'd done and the things he had found whilst looking for potential problems with the engine. He had both good news and bad news; the good news was that the car was not in danger of exploding (phew!) but the bad news was that there was indeed an issue with power loss. At this point he then proceeded to show me the results of the compression test... ah bugger. That immediately answered the question as to why the Trophy never felt "quite there" and is likely the reason it's felt that way since I bought it! (Yeah, I'm kinda embarrassed I didn't think of it but I'm no techy when it comes to engines I'm afraid...) It also explained why I got a figure in the 150's when the Trophy was put on the dyno at K-Tec in the first instance. Cylinders 1 and 3 are ok but cylinder 2 is not well and cylinder 4 is not well at all. Despite the compression issue Matt made a minor tweak to the map that improved the cold start situation somewhat.
In terms of the ITB's I can't complain as they appear to very well built and put together. However, I have my concerns over the choice of filter. As well as the bad news upon my return to TDF I was also greeted by trumpets full of disintegrating foam and Matt had kindly taken the time to clean everything up for me. This was frustrating given that they had only been on the car for 9 days. Sadly, the foam components also don't hold up higher in the rev range and the filter gets sucked right up against the trumpets. Below you can see the extent of the problem:
(Thanks to Matt for the photos).
Despite the above issue my early impressions of the K-Tec DTH ITB's are very good. The filter is being replaced next week with an ITG sock and a custom-made back plate to prevent the trumpets becoming fouled.
The good news and the bad news remain however (albeit in a different context). The good news is that Matt has kindly been able to squeeze me in on the 7th and 8th of April to get it fixed. The bad news is that it's an unexpected and hefty blow to an already lightened wallet! As I am often reminded that "you only live once and you can't take it with you" I have bitten the bullet and decided to go ahead with the following, courtesy of TDF:
- Valve seats recut
- Acid dip
- Skim
- Cylinder head pressure test
- Full cambelt replacement along with all fasteners
- New ITG filter with custom-made backplate
- Dyno and remap to suit the now-health Trophy
I look forward to Matt doing his thing on the soon-to-be-healthy Trophy and driving a car back to Wales with some noticeable improvement in performance. I am genuinely excited!
A big thanks to K-Tec for supplying and fitting their ITB kit, to TDF for their time and expertise in checking the map and the diagnostic/compression testing, etc. (and the forthcoming work) and to my mate who I chewed the fat with in terms of where to go and what to do once I'd decided to go down the ITB route. A special thanks to my partner, too, who had to put up with my moaning and general grumpiness once I'd found out what the problem was and also for keeping me company throughout the day.
Thanks to you, too, if you've had the patience to read through this... I salute you!