This is from the RR day in Bury in July 2002 where my standard 172 MK2 put out 136bhp at the wheels to Paddys 154bhp from his standard 172 MK2.
Anyone in the know care to analyse it?
http://www.rhys172.pwp.blueyonder.co.uk/images/yp02kkr_rr.jpg
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This is from the RR day in Bury in July 2002 where my standard 172 MK2 put out 136bhp at the wheels to Paddys 154bhp from his standard 172 MK2.
Anyone in the know care to analyse it?
http://www.rhys172.pwp.blueyonder.co.uk/images/yp02kkr_rr.jpg
Some 172s are faster than others. My mk1 172 is much faster than my mk2, but there are MK2s that are exactly as fast as my mk1. My best 1/4 mile run in the MK2 172 was 15.6, with the rest late 15s and 16s
A full second quicker in the MK1.Big flat spot in bhp from 5500rpm. The torque is up and down all over the place. If Jonnyboy sorts out the RR at the same venue Ill get a decent comparison between the two.
ICE'dberg MK2 172
Just a thought.....I remember someone else posting about an underpowered one and when they fitted an IK he found the air feed to the filter had become crushed/twisted in a way that made the bore a lot smaller hence lack of air hence low power.
I also had a similar problem with my viper....the air feed and split and I lost about 10bhp......should have checked all was ok BEFORE I RRd it..doh!
i think this issue of squashed air feed pipe to the airbox is common. Whenever the techno wizzes at Renault do a service or anything to my car involving removal of the airbox, they always put the air pipes back on the wrong holes resulting it squashed-tight pipes and bngger-all air getting to the airbox! Its really noticeable and i often forget to check if theyre on the correct way, in fact i might go and check now! i give them a good squeeze to re-form them into round tubes as its very tight and hard to see down there. Im not sure what the shape of the mk.2s are like, i guess they have a similar design, but enter a square box....... Really makes a difference. Also if they are disconnected, a very noticeable difference is well, noticed!
Ive gone back to my std. mk1 airbox and filter, but instead of the rubbish tubes that Renault supply, Ive used silver "Green" tubing to get airfeeds from underneath the car. Who needs a PiperX Viper
. Looks like the K&N filter doesnt give any extra "go" over the standard set up.Looks like all the extra 1/4 mile power was given by the decat pipe alone. Would be interested to see what my modded air tubes do.
From your graph, your peak torque is about 123lbft if you calculate it at 4500rpm and 105bhp. Thats pretty pants, especially for a 2.0 16valver. The way the torque curve drops off suggests its a breathing problem. Im pretty sure Simon172 is right. Weve fiddled around with his pipes (oh er) after the monkeys have serviced it and it makes a big difference. The rest of the deficit is probably down to you not fully wearing/thrashing it in, and also you tested it in July in a workshop with just a big fan for air, during the hottest Summer on record!!
Fiddle with the pipes and get it tested now - its probably a lot better now cos it feckin freezin outside.
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