That is a LOT of rubber on the road. Makes my 11s look like bike tires..

Yeah.. I really didn't need all that rubber . I was tearing up Quaiffe diffs every few races they couldn't handle the Tq and those big tires coming off a corner...the Gaurd GT held up though. When the car gets redone I will go with 13's in the rear and a smaller front tire too.

One word to sumarize VZ935's car = ORGASMIC!!!!!!!!!!!!

Not much.

You've done as much as possible with CIS. Time to go EFI and twin plug.

thanks to this thread I searched around my town and found a porsche upgrade shop that does efi conversions. They said they use megasquirts and the carrera manifold. They usually have kits ready to go and they only take 4 days to get it done which is awesome for me. I think im going with the highflow 2 from imagineauto. I appreciate the input you guys gave me!

What does megasquirts do for spark? Can you map out boost, spark and fuel with these things like a true standalone?

I have a new megasquirt for sale if you are interested. I dont have anyone local that knows how to install it so I went with a Tec3r.

Murfreesboro is just a short ride North for me. Can you shoot me an e-mail and tell me what mods you have done on your turbos?
Thanks.

Bruce, I'm just EFI-ing mine with Megasquirt so will find out how good/bad it really is.

Functionally yes - it can control fuel & spark, and it can do things like retard/advance timing based upon temp/boost.

Back to dynevahn's original question - my take is it depends on how long you want to engine to last. With ancient CIS/mechanical injection, factory 935 (i.e. with lots of goodies in the engine) last 1 race at 1.4 bar according to most material I read...

Dynevahn--

Get dyno sheets from these guys before you buy anything. NEVER accept "educated guesses" regarding hp/torque on a Porsche hop-up. More bs in this area than in a Texas cow pasture. If they've done these before they should have dyno sheets, either engine dyno or chassis dyno or both. Read them carefully. If you can, talk to earlier customers as well.

EFI is great. But it must be done correctly or you will not only waste your money, you will be frustrated beyond belief.

alot of pelican members reccomended them, Jon at Black Forest Racing. I will get dyno sheets from them as well. I will let you guys know how everything works out.

I had my 1985 930 at a shop getting the MegaSquirt EFI installed for over 4 months. Finally they just gave up. I sent it to another shop to start over with Tec3r. The first shop told me they had done dozens of MegaSquirt EFI systems and a few on Porsches. I believed them and it cost me $$$ and time. Don't skimp on this step. Take it directly to a shop that has real verifyable experience and pay well for it.

I hope to have mine back from shop #2 this week.

Bruce, I've been running a MegaSquirted twin-plugged 930 SC (spark and fuel) for about 6 weeks and am very pleased. It is pretty easy to get started if you've got engine maps from others with a similar setup (I'm posting mine for others), but to totally tweak it, you need a wide band O2 meter and/or dyno time. Great community of folks.

hey guys where can I get the twin plug setup and how long does something like that take to install?

You have to have your heads drilled for it. It's pretty involved. About half the people I ask say it is not necessary on Turbos anyway. I have it but had it done during an engine rebuild.

Big horsepower and torque goals mean twin-plugging is a good idea. Better combustion all around.

It's not an "install", though. It's a "build". Somebody has to drill an extra hole for the second plug in each cylinder.

interesting, so its best to do this with the engine removed?

Dunno if it has to be all out. But the heads have to be accessible.

Ollies in Santa Anna, CA will twin plug heads for 250.00 I think thats what I paid about 2 years ago. Then again, they could have gone up.

With regard to twin plugs.. my engine is twin pluged.. but my buddy Bob Stephanowicz's motor is a single plug twin turbo. runs it on full kill and gets 40-50 hours before feshening... can do a 1:46 at Thunderhill running the Eagles Nest.... he feels you don't need it but I guess it doesn't hurt ?

With regard to a 935... 935's run a bosch or Kuglefischer mechanical injection .. I can run 1.4 bar on my motor and granted it won't last as long but it will make over 800 hp and based on basic 20-30 min sprint races it will last quite a long time.