924Board.org

[morghen]

Just gonna lay this here...


turbine housing p/n: 5326 101 6365
compressor p/n: 5327 101 5091
compressor wheel p/n: 5327-123-2308
Backplate / Sealplate p/n: 5327-151-6701

This recipe can jump you over 300hp if you've got the fuel and will absolutely shock you on how fast you will run out of gears even with tall gears.
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https://www.the924.com

[Cedric]

[Fasteddie313]

Went cart racing yesterday at lv exotics..

Tons of ferraris and lambos and such there.. pro driver guy said the 911 gt2 RS was the fastest car there.. it was a weissach too..
I sat in it and stuff but didn’t pay to drive it, or any of them..


Idk how nuts I should go..
How nuts should I go?

Probably get a ton more power just being efficient around 1.5 bar..

Still would like to rig water injection too, just because..
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80 Turbo - Slightly Modified

[Fasteddie313]

[morghen]

I was running 1.1 bar on that thing above, it detonated sometimes but it was quick. I thought it could do more if fuel was controlled better, was thinking of applying your fueling system on that car but never made it.
It would lean out at wot over 5000prm in 5th and detonate while there so it was not easy to trick it to do high speed but 3rd and 4th were quick enough that the fuel didnt run out and it could hold 1.1bar.
Cedric says that the compressor i used was a low flow k27, it had a small inlet for a k27 indeed but it spooled just as fast as a k26 which was important for me. Not sure how efficient it would be at 450hp but we could take a look at its graph. I’ll look it up.
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https://www.the924.com

[Cedric]

[Fasteddie313]

Think I should just buy an upgraded /8 so it’ll fit my 6.10 housing?

That way I can just sell the one I’m running right now complete instead of canibalizing it...
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80 Turbo - Slightly Modified

[Mike9311]

[Fasteddie313]

It will run fine with no electronic control if you dial the mixture screw for a good idle, but will be far too lean on top/boost without pushing it richer with the electronic control..

I also highly recommend using overrun fuel cut below about 0.3% TPS, 33kpa, and down to about 1600 RPM..

Make sure you turn accel enrichment off too because I believe their is a bug in it that makes it work backwards..

EGO control works well too but I forget my settings.. I think I only use it up to about 110kpa.. When you get there I’ll give you my settings..

I would say copying my VE map would get you pretty close, but my car doesnt idle very smooth above about 13AFR, because I think my injectors aren’t very even at very low flow, but even out pretty well once the flow gets going..
Not sure how yours will behave..

So maybe if you copy my VE map and adjust your mixture screw to my idle AFR, then it would get your map pretty close for the top end, and you could lean your idle out as much as you can in the VE map if yours likes to idle better than mine..

IDK.. Maybe it has something to do with this FD idling on a 2.0 @ less than half the flow it would take to idle its V8 it came from.. Very little flow for it at idle..

It’ll spray plenty of fuel though.. It’ll still absolutely drown the engine out rich even over 20psi if I turn the VE up too high..
No lack of available fuel whatsoever..

On my stock pump it runs 100psi fuel pressure/system pressure almost all the way to full flow but will drop to about 90psi with the injectors absolutely blasting..
It might could use a bigger pump, or 2 931 pumps inline to keep 100psi at full flow, but it has not been a problem for me yet, as I doubt I am anywhere near full flow where it would start loosing system pressure due to the volume..
I haven’t exactly logged or watched fuel pressure on runs though, just spraying into bottles, but it seems to work fine and be nowhere near out of fuel with every bit of boost I can get my engine to make the way it is right now..

It is also extremely drivable and cruises any speed like a dream at whatever AFR I tell it to..
Response speed to drop AFR or even go into full fuel cut is also very good/fast..

It works..


If you want more info about how I did the TB and TPS let me know..
I guess you don’t really need a TPS, but is very nice to see it in the logs, and would be needed for fuel cut..

Also with fuel cut on, you can’t ditch the recirculating BOV and just blow it off to atmosphere, because it will fuel cut when you drop the throttle anyway..
But.. If I just half lift throttle enough for it to blow off a little, it WILL throw the AFR out for a second, enough to buck a tiny bit.. Haven’t found a solution for that yet..
Lift slowly or just know lifting fast will unsettle it a bit..

Thing is a monster.. It goes from boring to murderer in the blink of an eye..
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80 Turbo - Slightly Modified

[Mike9311]

You need a small % cut from reanimotion You sell this system so well

I have the S2 TB with the top mount cooler so I plan on finding a way to get a TPS on the throttle body. It will have the stock appearing 2667 turbo I just did so obviously the stock recirc. I am almost done with the rebuild. Also working on a head which will be mated to a stock S2 bottom end. This shortblock is essentially done and waiting on the head. I'm likely going to use MLS so it will need a skim. This setup is temporary for part or all of this summer while I work on another engine which is also in process both head and block. Trying hard not to spread to thin and stay reasonably on point. I like the pass kick plate mount. It looks tidy and accessible

So much to do! Been sizing up turbo center sections to bearings today.

Edit: Do you think I'm crazy if I run a second set of injectors higher up on the intake? Various reasoning for that idea but maybe its simply because we can
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1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car

[Fasteddie313]

I’m not sure about running 8 injectors... Why though?
The GTS ran 8 lines to 4 injectors, stock 931 injectors just like ours at that..
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80 Turbo - Slightly Modified

[Mike9311]

I was thinking of helping to cool the charge further. Craziness i know and its quite obvious they are not needed. Makes my life easier to eliminate the idea
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1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car

[924RACR]

Mike - did you see how I installed the Volvo TPS on my S2? Other than trimming the length of the throttle shaft, it was bolt-on with a homemade adapter plate. Volvo TPS was much cheaper than the 944 which is bolt-on too, both in the stock location underneath...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[Mike9311]

Vaughan, I don't think I have and just tried a search

Thanks for the tip
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1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car

[GregSC]

Wait, so a 944 tps is plug and play for a S2? If so is there a specific model and year range to look for? Sorry to cut in on the discussion but I've been searching for a bit of information about this and couldn't find anything definitive.
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1981 931