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> Fiid's Project Progress Thead., The Legend of Narparu
fiid
post Nov 22 2005, 06:08 PM
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I've been talking with a guy (Big thanks if you're reading!) in the UK who used to have the twin turbo legacy that this engine came out of. He's provided a lot of great info on the stock ECU which I should be able to leverage in my tuning. He had the following to say about the engine:

QUOTE

If you ever make 21psi you should be 350 ftlbs ish.  At that boost a single
detonation event could and probably will fracture a piston between the ring
lands. I speak from experience.

Looking at your piccies it looks like you have a 250 ps engine from a bg5a
legacy - ie like my old one.  It should make for good performance!  If you
tune it it will be, well, scary!  


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jsteele22
post Nov 23 2005, 12:40 PM
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QUOTE (fiid @ Nov 22 2005, 05:08 PM)
If you ever make 21psi you should be 350 ftlbs ish. At that boost a single
detonation event could and probably will fracture a piston between the ring
lands. I speak from experience.


Cool. Then you wouldn't need to bother with the knock sensor....
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fiid
post Nov 23 2005, 04:32 PM
Post #243


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Yeah - no $#!+.

(Fiid sits at side of road waiting for a tow).... "Guess it knocked!".

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mightyohm
post Nov 23 2005, 05:25 PM
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Does the knock sensor board in the megasquirt interface with the stock Subaru knock sensor on the engine? Is the megasquirt board thought of as a reliable solution or is it experimental? I think the only safe way to avoid knock is to keep your advance and boost at sane levels, and err on the side of rich for the AFR. Maybe you could find the advance vs rpm and map curves for a stock engine?
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fiid
post Nov 23 2005, 05:32 PM
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Yah. I think NOT running 21 pounds is a great idea - 350ftlbs from a 4 cyl will make short work of a 901, and besides. I'd settle for 250-280.

The knock solution I have is somewhat experimental.

I now have the stock AFR target table and advance tables, so I know what ballpark the engine is intended to run in although they aren't quite the same axis as the megasquirt (Load instead of MAP, etc).

I think by staying relatively conservative there's a lot of success and happiness to be had. Next up though is Muellers 2x4 & Sledge fender tuning.... (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif) :bfh:
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soloracer
post Nov 23 2005, 05:35 PM
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Are you using a wide band O2 sensor to datalog your mixtures? If not I suggest getting an Innovate LM-1. It's a very good unit and will be invaluable during tuning.
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fiid
post Nov 23 2005, 05:36 PM
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I have an LC-1 - I violently agree - they are awesome. I do my datalogging off the Megasquirt.
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fiid
post Dec 5 2005, 01:41 PM
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On Saturday the esteemed Mr Keyzer came over again to help with the project. He did an awesome job of beating my fenders out so they clear my 205s. We spend a little time fixing some idle control problems and also rose the ride height up a little bit.

Today I pretty much dared myself to drive the car to work - which went off without incident. It's about 20 miles from my house to work - nearly all on the freeway. The car cruises really nicely. I forgot how smooth my suspension setup is once it gets up to speed - just irons the bumps out - definately smoother than the miata - and it just hangs on through all the corners. Exceptional.

I did experience a few problems with the idle control system on the megasuirt before the car had warmed up properly. Still some work to do there I think, but I have some ideas on what to do next.

Very exciting.... will report more when I know more!

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fiid
post Mar 10 2006, 08:35 PM
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Minor update - did a bunch of work today to try and get the car ready for AX tomorrow. Good news is I think I can run it!!!

Did a bunch of driving and it looks like the cooling system is working fine. I think a lot of my problem might have been caused by various air bubbles in the cooling system.

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I'll try and get an in-car video soon!

P.S. Experienced throttle steer for the first time today (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif) Woohoo.
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fiid
post Mar 10 2006, 08:35 PM
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Oh - yeah - in other news - it's also running Megasquirt II now - which seems to be very smooth and running well!
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nsyr
post Mar 11 2006, 08:36 AM
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Gotta love the MS2! I've got the same setup, originally twin converted to single turbo with MS2. Ironically I bought the same exhaust manifold. I do have to ask if you had the same smoking problem from the flex joint where the manifold is connected to the uppipe? I assume it is because it is new and it's just burnoff.
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boogerboy
post Apr 27 2006, 11:09 AM
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just wanted to say thanks for all the help youve given me on aim, im hoping mine turns out as well as yours!
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neo914-6
post Apr 27 2006, 01:36 PM
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QUOTE(boogerboy @ Apr 27 2006, 10:09 AM) *

just wanted to say thanks for all the help youve given me on aim, im hoping mine turns out as well as yours!


Another Suby conversion?
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Cap'n Krusty
post Apr 27 2006, 01:52 PM
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QUOTE(Brad Roberts @ Jan 3 2004, 12:39 AM) *

I just know the tranny depth is correct and that the bus runs a type4 flywheel.

All buses came with the same Bosch SR17X starter that the 914 came with.

B


I'm a bit late, but that's just not true. All busses to 1975 came with the SR 17x, and all automatic busses to 1979, as well as auto Vanagons to 1983. The Cap'n
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boogerboy
post May 22 2006, 05:06 AM
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QUOTE(neo914-6 @ Apr 27 2006, 11:36 AM) *

QUOTE(boogerboy @ Apr 27 2006, 10:09 AM) *

just wanted to say thanks for all the help youve given me on aim, im hoping mine turns out as well as yours!


Another Suby conversion?
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oh im not new lol. Yeah, i should have my motor ordered this summer. im gonna run retty much the same set up as fiid. ej20, ms2, and probally his engine mount. (IMG:style_emoticons/default/smile.gif). Ill deff. keep everyone posted on it!
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