Why so little??

[philthy]

Sorry Kev, ignore everything that I have posted. They really should stop me smoking grass...

tut

[Kev]

No worries Tut

It must be those painkillers your on

[meatball]

think that the fall affected the silly old buggers brain as well

You did say that you had a pain in the groin!

[campbell]

Campbell - I'm just regurgitating the digested contents of internet engine folklore ... I had no more idea about how to tune an engine than anyone else 10 years ago and even today my knowledge is 99% theoretical

Cheers,
Robin

Aye but those 10 years have made a positive difference unlike some!

[Kev]

Well had it in to Rickys today to check the cam timing and it was spot on at 0.045" for the Inlet and 0.040" for the exhaust. I'm on nights this weekend so should get a chance to look at the cat.

The hunt for the missing ponies continues

http://farm4.static.flickr.com/3067/300 ... 90eb_o.jpg and http://farm4.static.flickr.com/3055/300 ... 8231_o.jpg

[robin]

Looking at AFR on those charts it's running quite rich - do you have an adjustable fuel pressure regulator on it? If so I wonder if it isn't a little too rich. If not, I wonder how it gets to be so rich even though it's making more power than it did as standard and it's still on the standard map?

Anyway, that torque curve doesn't look quite as severe as the last one - it at least now makes peak power very nearly at the rev limiter - anything different on this run? Different gear?

Cheers,
Robin

[Kev]

No, I don't have an adjustable fuel pressure regulator. The only mods I've done are what I listed at the beginning. As far as I know, the runs have all been carried out the same, apart from ambient conditions. Ricky said he has run it a fair few times only getting small changes i.e. 1 or 2 hp, apart from today when there was a little more. He suggests getting rid of the cat and also get an emerald, so then I'll get the full potential of the cams and exhaust system, but that means throwing more money at it to get it where I thought I'd be.

I've also emailed Dave at DVA for some advice and he suggested carrying out a compression test to make sure the bottom end is healthy.

[Kev]

Well I carried out an compression test tonight and they all seem fine to me, Left to Right - 170 - 170 - 170 - 175. I also had a look at the cat and that seems ok from both ends.

[robin]

If you have the stamina to pursue this you could consider running it on another rolling road to make sure that the data you're getting is sound (I have no reason to believe it isn't, but this could be a wild goose chase for some reason we don't understand yet).

I assume the cam lift was measured at TDC by actually checking for TDC with a dial gauge dropped down the plug hole onto the piston face, rather than relying on any timing marks on the pulleys, etc.? If it was done with timing marks, I would be checking that all the timing is right relative to the piston at true TDC ... I'm sure Ricky knows his stuff, though, so this isn't all that likely.

How did you ascertain that the cat was clear?

If you can get hold of an OBD2 code reader thingmy you should check there are no codes stored in the ECU. You can also use the live data reading to check that the engine sees full throttle when you press the pedal to the metal - the ECU uses the MAP sensor as primary load indicator and the MEMS at least was able to run pretty well with the throttle pot disconnected/broken.

The other thing is change the coil packs - these aren't cheap so I would suggest just swapping with a friendly local S2 K-series owner. In the past I would have suggested testing them first, but I've been bitten by that recently - they test OK until you actually want them to spark ... if you're adventurous you could rig up something to spark test them yourself ... but make sure you never discharge the S2 coil without having a spark plug in both ends and those spark plugs must route to a solid ground connection - this isn't just for your safety, it's also to prevent frying the coil pack. TBH, given that you aren't complaining of a misfire I would suspect that the coil pack is a red herring. But nothing else springs to mind either.

Cheers,
Robin

[Kev]

I had a look at the cat through both ends and a good shake, I also put some air through it at about 50 psi and never noticed anything untoward.

TBH, I'm going to give up for now and just put this down as experience. I've got a few things to sort out for its mot and with christmas coming up, I can't keep throwing money at it. The only time I get a chance to work on it is when I'm at work, when thats not busy, which isn't too often these days. I get fed up easily working out in the cold with no garage. Just gutted with the result for the amount of money I've spent on it. I'll see what next year brings. Thanks for your help Robin

[Rich H]

That is far too rich, your peak AFR looks to be around 12.25:1 and the lowest is 10.75:1.
AFR should be 2 or 3 points higher IIRC Peak power is 13.5:1

How about this: The Inlet air temp sender is either buggered or covered in clag its giving lies to MEMS, MEMS thinks the air temp is really low so it hoofs in more fuel than it should - that gives an overly rich mixture and robs you of power. Is the tail pipe and rear clam sooty? Plugs sooty?

Alternatively the FPR is buggered and has upped the fuel pressure or the wrong injectors are fitted. Bit spurious though.

Rich

[Kev]

Well decided I can't give up, that's too easy and ordered a live data OBD2 reader thingy off ebay. Hopefully it arrives tomorrow so I can have a look at what some of the sensors are doing.

Cheers
Kev
(will not be defeated faction)

[Kev]

Well my gadget arrived, I had 3 codes, 2 I induced last week so not worried about. I had P0106 - Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance. I've cleared the codes and I'll drive it for a couple of days and check again, just to make sure it's not a spurious fault.

I also check to see my TPS and was getting a max of 71.3% with my foot to the floor. I'm assuming I should be getting late 90's-100% for fully open. I tried a reset and it's still the same, so checked visually and it's not going fully open. So I'll adjust that and see what happens.

[campbell]

Checking for fully opening throttle is the first thing the AVA rolling road did for us all many years back on an SE group session. Guess it should be part of any decent RR tester's checklist but apparently not

gotta be worth 50bhp

[robin]

LOL. Here's hoping it's that simple I don't suppose it will be. The MAP sensor function is actually more likely to be the issue as it's the primary load indicator to the ECU and your engine is running rich.

Cheers,
Robin