924Board.org

[CorsePerVita]

Ok, i've seen a lot of PICTURES of setups, and a lot of threads with links that are broken and not a link of definitive info. What i did find was a thread a while back regarding zx6rr throttle bodies with rails and injectors that work @ 38mm.

So.. for an EFI setup with a megasquirt, what sort of fitment/options do we have that are a DIRECT bolt up to the head? I assume the ITBs are going to be DTH?

Part numbers? Brands?
_________________
- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS

[ideola]

Links from the performance upgrades thread:
References

• 931 intake mods - which throttle body for EFI?
  
• Audi Throtllebody and TPS Conversion
  
• Throttle body comparo --> stock/Weber/Audi
  
• ITB and Plenum Teaser - giggle
  
• EFI/ITB/Garrett Engine
  
• ITBs on an N/A

Suppliers
DIY, www.extrudabody.com
_________________
erstwhile owner of just about every 924 variant ever made

[Rocco R16V]

[Joes924Racer]

Ask your fellow Norwesterner fiat22turbo he has some on a
project.
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

[CorsePerVita]

[CorsePerVita]

[fiat22turbo]

Personally, I'm only really doing the ITBs because I've had them for quite a while and wanted to finally use them. They are likely rather useless on a stock head. Eventually I'll spring for larger valves and proper porting (or learn to do it myself)

In your case? I would use the stock intake with that Passat throttle body mentioned a while back that has a throttle position sensor on it already. Combine that TB and a stock intake with MegaSquirt, the injectors and fuel rail I have for you and the fuel regulator of your choice (I have one of those as well if you want) along with the rest of the sensors and wiring you'll need (DIYAutotune.com is a great source for connectors, labeled wiring, sensors, and tuning help)

If you're having the head machined by the machine shop, have them bore the old injector holes out to fit the Bosch injectors and O-rings. This will bring the tip of the injector closer to the port and lower the fuel rail assembly to make fitting the air intake tubing easier and make mounting the rail much easier. You can also bring the head up and I can bore them out on my Dad's milling machine.

Otherwise, see if you can get some transmission drainplugs and have them bored out to fit the injector O-rings.

This is the quickest way I know to get the car up and running, since you'll only have one throttle to sort out, vacuum signals for the MAP sensor will be more stable, etc. The head will limit your power and the lack of compression ratio also doesn't help.

In the meantime, keep an eye out for a DCOE style intake and build up a spare cylinder head with porting, valves, springs, cam, etc. Then you can decide what type of throttle bodies/intake you might want to use or can get.

The TWM throttle bodies are about $1500 list price with the fuel rails, etc. Mine were about $300 off eBay many years ago because they were miscategorized.

Jenvey out of the UK has them as well and is likely what Pierce Manifolds would get you if you call them (since they've pulled it from their website)

Tweakit is out of Australia and isn't bad on price either, depending on the exchange rate.

Extrudabody has an interesting solution, which is similar to what I would do with the Bike parts. Build a base plate and bolt the TB's to that. For $995 it seems like a deal compared to the others.

The Bike TB's would be just as good and cheaper, but would require adapter flanges be made to mate their tubes to the DCOE flange. Not impossible, but something that would take a little time. If they are mounted using rubber tubes, then there is a little more flexibility.

Either way, with the bike parts you'd need to watch the bore spacing since the DCOE intake pairs the intake ports off. You may find that cutting up a stock intake manifold makes more sense since the ports are more evenly spaced. The trick is finding someone who can weld cast aluminum or is willing to to do aluminum brazing.

With any of the ITB solutions, you'd have to stabilize your vacuum signal to the MAP sensor by building a vacuum manifold so that the MAP sensor sees the sum total of the vacuum in the cylinders. With a nasty cam and porting, that signal may drop enough to warrant dropping the use of the MAP sensor and moving to Alpha-N to stabilize the idle and low speed drivability.

An interesting discussion on the topic:

http://clubroadster.net/vb_forum/showthread.php?t=10012

and another link that goes into detail on how he did ITB's the DIY way and got it to work with MegaSquirt:

http://grassrootsmotorsports.com/forum/grm/lethal-locost-goes-megasquirt/8505/page1/

Note: MadScientistMatt on that board works for DIYAutoTune and is amazingly helpful.
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

[CorsePerVita]

Holy moly man, that's a lotta post. Thanks dude, I appreciate all the good info! I need to get my ass up there and get you your parts and give you some cash and get that system.

Going to take the info and save it to my neverending "book of 924" - thanks again man.
_________________
- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS

[Joes924Racer]

You know dude you could just get another notebook,
like an extra laptop for notes or pictures.. what ever.
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

[fiat22turbo]

Obviously, since I don't have a car running on MS yet, I'm just basing this all on experience and what info I can find.

So while I hope this helps, this isn't to be taken as gospel or the "right" way to do things as there is more than one way to skin a cat . These are just my thoughts and how I'd go about solving the problem(s) at hand.
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

[CorsePerVita]

[buldogo2]

I'm working on a reprodusebel boldon for the zx-6r 05 ITB's, at the moment i'm working on the vacium for the power break line. Only problem is that my computer isn't coping it that well...it's working on in for 16 hours now .

Here some pics hope it's helpful







http://www.youtube.com/watch?v=6FgKd9wpKx0&feature=player_embedded

[morghen]

nice renderings, the welds look very realistic

8 injectors? BIG HP projet?
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Supercharger and EFI kits
https://www.the924.com

[buldogo2]

[Martijnus]

be sure to keep the injectors in the head as primary injectors i've experienced how bad it can get when the injectors are in the tb's.
Those are 40mm tb's btw... it probably will go better with smaller tb's, but keep in mind that the air velocity is the highest right before the valves, where the stock injectors are placed.
_________________
"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment