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View Poll Results: Where should I look next
Fuel System 1 12.50%
Ignition System 4 50.00%
Air System 1 12.50%
Cam Timing 1 12.50%
Valve Timing 0 0%
Pull the heads off and start measuring 0 0%
Turbo 0 0%
Find an expert 2 25.00%
For a new owner 0 0%
Multiple Choice Poll. Voters: 8. You may not vote on this poll

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David's Avatar
 
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Quote:
Originally Posted by AngM018 View Post
You may also want to consider going for a more aggressive cam if you do swap them out. SC's may be a little watered down for your set up.
I was thinking the same thing. 964 cams at the minimum.
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Old 11-13-2007, 03:28 PM
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OK just got back from the shop. We confirmed that the ECU was set incorrectly and set it to 6 teeth before the missing tooth. It appears that the TDC center mark on the pully was out by 10deg.

I am aboutt o jump in it and take it to T&D automotive in Brisbane 7hours away. So I will not be able to post for a few days.
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Old 11-13-2007, 04:53 PM
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Quote:
Originally Posted by rotorhead View Post
OK just got back from the shop. We confirmed that the ECU was set incorrectly and set it to 6 teeth before the missing tooth. It appears that the TDC center mark on the pully was out by 10deg.

I am aboutt o jump in it and take it to T&D automotive in Brisbane 7hours away. So I will not be able to post for a few days.

Bingo!

Now put it on the dyno and do proper mapping by flattening out AFR's (you are going lean on initial boost buildup) and then chasing optimal torque with ignition advance.

I'm pretty sure you'll se much more power even with relativly mild cams.
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Old 11-14-2007, 04:38 AM
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Quote:
Originally Posted by beepbeep View Post
Bingo!
Beep I have just driven 800km to get the car to the best Porsche race prep shop in this little country. I am printing out this thread as we speak and tomorrow I am confident in getting it sorted out. (Because on Friday I have booked a day at Willow Springs International Raceway).
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Old 11-14-2007, 04:50 AM
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Glad to hear you made it OK. So there's a Willow Springs in Australia too?
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Last edited by David; 11-14-2007 at 07:22 AM..
Old 11-14-2007, 04:53 AM
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its here on google earth

http://maps.google.com/maps?ll=-27.691040,152.652283&spn=0.009527,0.013626&t=k&hl=en

its the piss weak version of Willow springs
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Old 11-14-2007, 04:58 AM
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It is funny that this post had 65 replies and 588 views yet only 5 people have taken the poll on what they think is the issue. C'MON PEOPLE IT'S IGNITION TIMING NO-2 ON THE POLL
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Old 11-14-2007, 05:07 AM
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As far as I can see, engine is almost stockish except for KKK 7200 and EFI.

My suggestions are following:

1. Find and adjust trigger until 0 deg. in software means 0 deg. in hardware. Check with timing light.

2. Advance timing to 15 deg. and check that timing jumps 15 deg. in hardware (to be sure that trigger wheel software-interpretation is OK).

3. Engine being stockish (no twin-plug, right?), start with initial timing advance slightly below OEM 26 deg. (to safeguard against possible lean condition), disable accelleration enrichment (that assumes you arre doing long pulls in 3:rd or so) and do pulls and mapping of fuel cells until AFR's are rock-solid in 12.8 to 12.4 range. (I prefer 12.8, many have different opinions of AFR's on aircooled cars. It's yours and your tuners call). Devote extra time to make AFR's stay flat between trasition from no-boost to boost. This is the trickiest area to map as VE takes a big jump. Making this work 100% will improve spoolup and driveability, which won't show on peak dyno numbers.

4. Once AFR's are in check start advancing the ignition timing towards OEM and superimpose torque curves after each. Remember that you are tuning for gas being in tank...once tuned, you shouldn't fill it with lower octance brew. You will see torque slightly increasing untill you hit the limit. (Always check your AFR's during this). Limit will be either when torque starts dropping or engine starts to ping. As this engine is less forgivable of pining, I suggest playing it safe and increasing the timing to roughly OEM value and not going the whole length of finding out where it pings to save piston rings. As far as I know, gas in Oz is not always good and weather is hot. When all is done, you should be making around 330-340hp and will have total advance around 26-28 deg.

5. (This is a fine part). Ask yourself what is more important: torque off-boost or quick boost? There are tricks you can play with ignition to achieve quicker spoolup. Of course, there are always drawbacks. In case of track car that will spend most of it's time revving above 3000 RPM and where getting out of boost hole is important, it might be usable to actually drop the timing just before boost treshold in order to spool turbo quicker. This will make car consume more fuel in steady-state (like cruising on highway) but it will give you slightly more response once you nail it. Re-check AFR's after doing this and make necessary adjustments as AFR's might change.

6. Re-enable accelleration enrichment and play around with different values until fast prod of thottle in low gears doesn't make engine bog down. This is trial-and-error stuff.

7. Do a dyno pull and brag on PP

I'm sure you'll get to bottom with this, build sheet sounds solid. It's just a software glich
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Old 11-14-2007, 06:22 AM
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It may be ignition timing now but I don't know if it was originally.
You stated that this engine has always been sluggish, even when stock(ish). Your current EFI/Ignition issue couldn't have been the problem when the engine had a CIS and a distributor.
You will likely never know what the problem was, only what it now may be or is. Your perserverance of the problem is only outweighed by your willingness to throw money at it, ha! It's a common affliction.
You'll have a wicked fast car soon.
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Old 11-14-2007, 07:12 AM
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If you had slugish performance even while stock, it's even more important to check ignition timing. Your distributor might have been installed one hack south or timing markings might have been altered.

As I said before, it's imperative to find out TDC and bring it into sync with software, even by means of pulling a plug and sticking in a dial gauge.
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Old 11-14-2007, 08:46 AM
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