Went to stealth yesterday to get alignment and a rolling road session. Setup is; Reconditioned 9a Twin KR exhaust cams S/S manifold back exhaust including 4 branch Lightened flywheel 50mm inlet manifold K and N panel filter with drilled air box Initial run; 139.7bhp @ 7533 and 111.5ft/lbs @ 5403. After a little tinkering with the timing and fuelling (about 5 mins!) second run; 170.1bhp @ 7633 and 127.3 @ 5422 The torque curve resembled a mountain range pre-tune with big drops at 4k and 7k but this got smoothed out with the tune. Impressed with the power but would have liked a little more torque. Car feels transformed both in handling and a massive improvement in the power delivery, highly recommended! I realise the car must have been running pretty badly before but i was really surprised in the 30bhp gain just by correcting the fuelling and timing!
Good stuff, I remember when I took my mk2 there, similar spec to yours with a similar end result. I was an extremely happy chappy
How much did it end up costing? Me and a mate are both doing 2L 16v conversions (one ABF one 9a) and are planning a trip there next year to get them setup properly.
Standard K Jet, I ended up spending more than i planned as the car was too low and the coilovers were seized but rolling road tuning is 65 + vat per hour and is usually done in an hour. Can't recommend this enough the car feels completely different to drive and im more than happy with the figures! Am i right in thinking the torque is a little low though?
Ultimately if you feel the car is quicker that is what matters. Shows the differences in dynos. DD units measure poorly calibrated ABF motors at around 127-130lbft, with healthy units at 145lbft of torque. RPM accuracy is key to have more represenative bhp measurement. Note though that 16v engines that achieve 127lbft on the DD dyno still feel very quick to drive. Your bhp peak RPM is quite high as well. Have you had mods done to the ignition module?
The car feels much quicker and is much more fun to drive. Vince did ask whether the ecu had been played with as it rev'd over standard, its nothing i've done will have a look through the book of receipts to see if i can spot anything. Is it likely its just had the limit raised or something else as well?
that seems to be very good results from them setting the car up yesterday, bet you are over the moon with it. how long did it take vince to set it up. when i last had mine on the rolling my max revs were 7412rpm so it isnt much behind yours and it is still running the standard ignition module etc. am i right in saying that the standard limiter is at 7200rpm? cheers Mark
harryc - best I got with similar spec to yours but with shed head was 183hp 145ish lb/ft, few years ago now though! Interested to get my mk2 VR6 on a DD rolling road, be lucky to see 195-200hp I reckon! 215 @ Stealth. The closest one to here is near Cheltenham. http://www.ajecracing.co.uk/racing/road.php
Maybe its time to plan a London day trip, and that fast boat anchor on the "London CGTi hall of fame board". You know I would make sure it measuring right .
I was just thinking it would be interesting to see how much the power increased with a ported head. I think Stealth have had a new rolling road since yours was done - not sure what type it is. It's allegedly a bit less optimistic than it used to be. @harryc, I'd have said the torque fig seems a bit low. My old 9A on KR cams (not twin exhaust) made about 135 lbft at Stealth. Have you got the printouts to put up? The shape of the curve is more interesting than the peak number. I'm not really surprised at the gain between the runs. Kjet cars seem to be very sensitive to ignition advance, and they tend to run on the lean side as standard.
I used to have a 944 Turbo and we in the Porsche Club always used a Dyno Dynamics RR year on year and back to back. They are very accurate and allow for rolling resistance and temp and humidity when calculating bhp. Problem is they tend to read low (accurately) where other `max power` set ups dont mind if theirs read high (if you know what I mean) and can be up to 10% out but strangely enough its always out 10% higher
Been to Ajec today, results on my members motors thread http://www.clubgti.com/forum/showthread.php?t=123&page=39
Quick question; Didn't get a chance to ask but when the fuel pressure was checked and altered was this the WUR mod being carried out? Wasn't sure if there is a difference between setting the correct pressure and WUR mod? Apologies for my ignorance, didn't get on the rollers til quite late and didn't get to ask all my questions!
