CIS to EFI kit

[atech]

Question, where is the option to purchase the tbitz efi system?

[timmy2]

Originally Posted by atech

Question, where is the option to purchase the tbitz efi system?

Try here:
Home

[atech]

Been to the site but no buy it now or even a phone# googled it and cant find a vendor who sells it

[timmy2]

Did you try Emailing the owner?
Tony will reply.

[acme911]

Originally Posted by atech

Question, where is the option to purchase the tbitz efi system?

Yes, Email Tony. i just purchased a kit from him about a month ago. I will be using a Carrera intake that had the rails, etc. Let Tony know and sent some pic's of it. He sent off a kit with map adjusted to my needs all for around $700 since I had all the other parts.

All this will be going on an '82 3.0 motor.

The Yahoo group site and Tony are very active.

[wreckah]

it's 2017 now, i installed this kit this week, and i'm very happy. It's easy to install, it's good quality, it has been proven, not too complicated to understand or tune, and you get rid of 99% of the CIS junk (yes, most of it is aged junk by now). I took my time to get rid of fuel accumulator, decel valve and AAV too (which is not strictly necessary in a standard conversion).

I am on my second day (third drive) into tuning, and hot starts and driving are already very good, much better than CIS ever was.
Cold starts are not yet okay, and you know why, because there's one last CIS component screwing things up: the AAR which seems to close completely, but is in fact still a huge airleak when fully closed. I'm looking for options now to delete this last dinosaur.

I don't really care that the MS1 has been superceded twice now, it still works and has plenty features. It's a great solution for almost plug and play install, and easy tuning.

[groovydude]

Originally Posted by wreckah

I am on my second day (third drive) into tuning, and hot starts and driving are already very good, much better than CIS ever was.

Just curious, can you please elaborate on "much better than CIS ever was"? Are you feeling improved power and/or torque? Throttle response?

[timmy2]

Yes to all 3 since 2012 for me.

[wreckah]

yes, even with the base map:

- crisp throttle response (no delay like with CIS)
- loads more low end grunt because of much quicker accel enrichment
- the same goes for the top-end, it's manic.
- smoother running engine, less vibrations

haven't checked mpg yet, but i'm sure this will improve too.

And you have the added psychological benefit of knowing that alle these aged and tired and half-broken and leaking and cracked CIS components are out of your car.

[antares]

… so just curious , what makes you porsche bucks think that by just installing this "kit" you will have any "real" resemblance of improved mpg over a properly functioning CIS system … yes a properly functioning CIS system …?

With that said, here is our take on this area of the kit mpg claims improvement scenario … To truly accomplish this, one needs also to control spark and advance curve on the fly in relation to torque, load as well in conjunction with air density control. The addition of a crank sensor and dedicated coil packs incorporated into your Kits, are then a needed part while in pursuit of realizing this MPG mantra so often talked about but rarely truly achieved ….

[wreckah]

...i'm quite sure that it's hard to find a truly good CIS system out there by now. Even though it might seem to run well, i'm sure not every component is still 100%.

A brand new CIS will work great...but after 40 years you got WUR's with wrong resistance, fuel distributors that are dirty inside, fuel accumulators with worn membrane, leaky AAR's, etc etc the list is endless, and the prices for second hand (all these parts are not available anymore) are rising quickly...for me, it had become economically unviable to keep patching up the CIS.
I'm very happy with my new system with almost nothing to fail.

[Nux]

Originally Posted by wreckah

...i'm quite sure that it's hard to find a truly good CIS system out there by now. Even though it might seem to run well, i'm sure not every component is still 100%.

A brand new CIS will work great...but after 40 years you got WUR's with wrong resistance, fuel distributors that are dirty inside, fuel accumulators with worn membrane, leaky AAR's, etc etc the list is endless, and the prices for second hand (all these parts are not available anymore) are rising quickly...for me, it had become economically unviable to keep patching up the CIS.
I'm very happy with my new system with almost nothing to fail.

+1. I installed the Bitzrace kit during a weekend. Straight forward procedure, with cookbook step by step instructions. Did it with engine in car, no drop. Engine started right up and using Tuner Studio I'm now feeling more power, greatly improved throttle response and non of the CIS related issues. I did a dyno test with the CIS before changing and will report back after tuning the EFI. I do not have any numbers on fuel consumption - but I have been mainly focused on my faulty CIS and the extra HP I get from this kit. IMO there's is no cheaper or better bang-for-buck upgrade to improve the injection system of these cars. Sure you can go MSII/AEM/ITB and so on - but then price rises exponentially. Just my 2 cents.

[timmy2]

My fuel mileage average went from 16 mpg with a well tuned CIS with SSI's and Dansk muffler, to an average of 17.5 mpg with EFI. This has been constant since installing.
The '78 was rated at 16 mpg average when new.
A small but noticed improvement in MPG. 10% average.
Very noticeable improvement in throttle response and acceleration.
Haven't had to adjust anything in about 5 years for tuning.
Just get in, turn the key and go.
No other changes to ignition or timing etc were made.

[Eli W]

I have a question about this kit.

Are you going to see the same HP gains that you could see with going with Carbs? Or potential hp gains, I know depending on engine set just going stock to carbs is not going to do much at all. I realize too the mpg is going to be much better than carbs with blitz.

And Carbs do better with carb cams.

My car already has electromotive crank fire and twin plug going with this kit would seem like a good fit.

[wreckah]

i am not trying to convince anyone to go for this kit by the way. I'm just stating that i like it alot, and that it solves all my issues.

Everybody can happily do what he/she wants.

For me, it just made a lot of sense to have reliability/tunability for a very low price. +/- 2500 dollars will give you this kit. Yes, you can probably fix CIS with the same amount, but even then, you are stuck with a non-tuneable injection system, and 40 year old parts.
Any other FI system out there starts from 6K or so, and is much harder to tune. So as much as ITB's are attractive ooooh aaaah yeahhhh (and i get that!) i cannot justify the cost for me personally...plus it is almost impossible to tune as a DIY kinda guy.

OK, it's not original, but i don't care, i drive my car (10.000 miles/year), i don't intend on selling it anytime soon. I want it to start on the button winter and summer and be reliable (and be quick and sound great ) .

[Pazuzu]

Last two rallys I was getting 18mpg average with my Bitz system.

250 miles, flat out on farm roads, flipping between 3rd and 4th, some triple digit speeds.

Now, I *did* have some trouble with it just the other day. I was messing around with the control box while driving, trying to get my bluetooth transmitter to work. Suddenly, the car started running poorly, the AFR was pinned on 10 (full rich), bogging, etc.


Turns out I had pinched the vacuum tube leading into the control box in the process The computer was working fine, it thought I was WOT even though I was sitting at a light

so, it seems that EFI is NOT 100% idiot proof

[trond]

another happy user here ! Has been running great since 2009. 18 mpg mixed driving, 25 mpg on longer trips, without being too careful with the throttle

[jsveb]

Ding it I must get my bitz installed. Been on the shelf for yeeears now.

[Eli W]

Lol, glad I'm not the only one I bought the parts to rebuild my transmission two years ago and just now have had it fixed.

[jjeffries]

Exposing my engine-bay vanity but if/when I go this route I'd want a better looking air intake system. Maybe one could find bits and pieces from other cars (i.e., salvage yard) to cobble together something a bit more OEM or at least, less Pep Boys/eBay-tuner. Of course while I'd be worrying about that, the guys who've already installed the Bitz kit would be out there actually driving their nice-running SC's! John.