The improvement in the way the car drives is the main bit so as long as you are happy then dont be alarmed On a stock 1800 the peak power is around ~6300rpm with limiter at ~7200rpm. By swapping the inlet cam for an exhaust cam it isnt going to alter the stock power band a great deal (as the lift/duration of the 2 cams are pretty "similar") unless the cam timing has been played with or perhaps set a tooth out (retarded 1 tooth) to allow for the increased rev limit... This would make the car very peaky with no great urgency until well up the rev range. I speak from experience having owned a 2L 16v Jetta with the exhaust cam mod & also an ITB'd 2L 16v Golf, both previously fettled by Vince As an aside...I take it your block has ARP fasteners or similar, as it wont thank you for being revved to nearly 8k regularly. I used to suffer with flywheel, clutch & PAS bracketry problems when revving to those levels in my ITB'd Golf
@ GVK thats some tasty torque from the vr! Would be happy with the numbers from the valver plot tbh! @ Chris Eyre, Have only put 1000 miles on the new 2l so looking for bolt ons at this point, really happy with the way it drives and the peaky power band just thinking it may not be fullfilling its potential!
I've not read everything on the car, but the KR cams are in there, the 50mm inlet mani. Double check the WUR mod is done also. Could be worth a separate thread, asking for more ideas? Enjoy the motor in the meanwhile
Not sure if Vince checked the cam timing? but the numbers could certainly point at it being set to something non-standard... It's very hard to compare if Stealth have got a new RR but sub 130lbs/ft peak torque from a 2L sounds lowish compared to the numbers you will see in old 2L 16v threads. If the cam timing IS out then resetting it will give more midrange torque and most likely shift the powerband down the range Something definitely doesn't add up when your power is still climbing at the point your average valver has hit it's rev limiter!
Long gone. I think you might have a bit more potential in the engine you've got - you should find someone to double check the cam timing with DTI gauges. where did the modified exhaust cam come from? Reputable source?
they had a retarder rewound earlier this year and when refitting it found not all of the coils on the old one had been wired up. My ibiza kindly burnt off its new paint off the retarder mid year working the dyno to the max (pegged it big time) - literally smoking like a trooper (dyno not car) no idea what it made but it was >dynos max kw @ wheels with some discrpency between the digital readout which feeds the aquisition dynoplot software and the dials. digital stopped at a max lower than the dials did.
I hope so! I got 2 sets of cams along with the ones in the engine when i bought the 9a, i measured all the lobes and identified all of them. One was an exhaust cam with the key way cut etc for use as an inlet. Think i may have an abf inlet at home as well, will have to double check. Adjustable cam pulley and another rr session worth a shout?
If the cams are standard VW items then Id just whip the cam cover off & check all your timing marks line up with #1 @ TDC on compression... Should be no need for a Vernier Pulley TBH
Thing is, if you don't know who cut the keyway in the Exh cam, can you be sure it was done right? A couple of degrees out could make a big difference. I wouldn't be bothering with adjustable pulleys on VW cams, tbh. Better spending the money elsewhere. Maybe you should start by ringing Stealth up, and checking what they did. Also ask what Vince thinks, as he's seen a fair few of these engines, and should know what sort of power they're making on his dyno, these days, as opposed to 4/5 years ago when my old car was there. You'd need inter-cam verniers to get the inlet timing right, if it's been cut slightly out.
just to compare, I had my 6A+KR head (and standard KR cams) engine on Stealths rollers the other week, last time was about 2005. Nothing has been changed on the car, standard ex manifold internally polished. The injectors are now 20 years and 165K old lol! in 2005 after setup on rollers: peak 175bhp (139 ATW) 150 lb/ft couple of weeks back: peak 167bhp (135 ATW) 147lb/ft 7,200 red line there's very little in it, but from all the cars running on there it seems the 'drivetrain losses' figures are a little lower now on stealth's setup. BTW, old and new plots almost perfectly overlay, just with a few % lower figures
Thanks for that it's good to a have a similar setup to compare against. Need to get to the bottom of my low torque figure as I'm down 20ft/lbs on your results.. Do you have pics of the curves I could have a look at?
