Bosch K-Jetronic CIS Car Owners, UNITE!

[outatym2001]

Shoot! I usually notice things before posting like you have an 88 Esprit when I thought you have an 87. I just now downloaded the 1988 – 1992 Esprit Parts Manual to get a better understanding of your Esprit.

Ufff da. You have a primary and secondary fuel pump for your Bosch mechanical fuel injection and two steel fuel tanks.. What a pain. That fuel page 44.03C looks like a plate of spaghetti.

You’re welcome on the routing suggestion although I’ve never taken the interior of an Esprit apart but the DeLorean is similar to the Esprit as far as the main wire harness it is hidden under the center vinyl covered arm rest.

I tried sending you a personal message regarding my 81 DeLorean but your inbox is still full. I don’t want to get off topic and tell the whole world about my D. Clear up your inbox and I’ll send you a message.

Mark Vanyo.

[MrDangerUS]

Mark, don't worry about it.

Your DMS has CIS, so it is good to go. It makes the thread more interesting and everybody can learn new tricks.

Some Ferraris and Lamborghinis have CIS injection. It would be interesting to hear their owners' impressions.

Not too many people know that DMC is a step-child of Lotus, sharing many systems with Esprit.

Edited May 10, 2011 by MrDangerUS

[MrDangerUS]

D-WUR update: the stepper motor has been replaced in favor of a fuel injector serving as a frequency valve

http://www.thelotusforums.com/forums/index.php/topic/41947-bosch-k-jetronic-cis-tuning-86hc-87hc-88-x180-esprit/page__gopid__357682#entry357682

[The Veg]

Another fly in the ointment: the guys on the TurboEsprit Yahoo-list are some rather experienced hands (well, some of them anyway), so I asked for an opinion on the DWUR...and the consensus seemed to be, "why not just do a complete EFI system, such as the MegaSquirt or similar?"

I know the price tag is fairly different between the two approaches, but ignoring that factor, it IS a rather interesting question.

[MrDangerUS]

In the past, when they were looking for the way to improve CIS- the only"improvement" available was...EFI.

They never followed up on new ideas and never went back to look what the current technology offers.

In addition, if you noticed, mostly non - Bosch guys offered their opinions. I bet you they don't even know how the Wur works and what it does.

And... those are their opinions only (NOT facts stemming from experience). They couldnt be bothered to study, comprehend the system and play with it. They never did.

The beauty of the DWUR is "plug and play", one part, wiring loom and controller. Done!

You don’t have to weld up bungs, re-design fuel and electrical system, etc.

Have you read 53 pages of this thread? http://forums.pelica...tal-wur-53.html

I decided to build the most powerful Bosch CIS Esprit and prove all sceptics wrong.

The distance between Maddness and Genius is measured in success.

Edited May 13, 2011 by MrDangerUS

[Rich H]

Having replaced CIS with EFI on my old Porsche 924 - I can confirm that, while EFI is always going to be more flexible it is a nightmare to assemble, so much needs making from scratch you have an inordinate number of opportunities to bollicks it up... The DWUR is bolt on and simple to operate, an effectively blank Megasquirt is a whole different ballgame!

[StevenD57]

The EFI system I added to my 2.0L 907 motor was not "a nightmare to assemble"

What absorbed most of my time was designing the high pressure fuel system since the car had ZS carbs to start with.

The Bosch CIS system already has the high pressure fuel system so that should not be an issue.

I wish I had access to a Bosch equipped Lotus motor. I am sure I could come up with a nicely engineered system to put EFI onto it using Megasquirt.

I almost bought a 1987 turbo car last year but it got sold out from under me.

[MrDangerUS]

Dear "Brothers in Bosch",

To prove that Bosch cars can be fun and offer ample performance improvements, I decided to embark on an engineering development adventure.

My intention is to re-engineer the Bosch injected car without tearing into the engine and without conversion to EFI. (Do not even mention EFI here! IMO, it is a blasphemous talk!).

Project name is X180-Rx300. Now, when I see it is quite feasible, 300HP goal should be sufficient, providing adequate attention will be paid to Citroen/Maserati transmission.

I invite anyone who has a K-Jetro car (does not matter what make), or has any experience on this subject matter, to participate/share their thoughts.

Again, NO EFI-talk, please.

How to doit? Please follow Forums "Garage" and a related thread:

http://www.thelotusforums.com/forums/index.php/topic/41947-bosch-k-jetronic-cis-tuning-86hc-87hc-88-x180-esprit/page__pid__357717#entry357717

Edited May 18, 2011 by MrDangerUS

[MrDangerUS]

As promised, I posted in the Forum "Garage" section (mod: Intake Flow & Plenum Volume), few pictures of the IM diffuser “Moustache” diverter, which equalizes filling of the cyl #1 and #4.

Also shown, there is the Commemorative Michael Rodrigues Plenum Expander, milled of the 1" billet aluminum plate, which adds 60 cu in to the overall plenum volume.

It has a positive effect on cylinder filling in higher rpm band, as it acts as an in-line Helmholtz resonator coupled with the cylinder cavity volume. (See: SAE Paper Number 983045. Analisi e simulazione di sistemi di aspirazione accordati al motore. D. Bortoluzzi, A. Doria. Department of Mechanical Engineering, University of Padova,Via Venezia 1 35131 Padova Italy).

Edited May 20, 2011 by MrDangerUS

[The Veg]

Also shown, there is the Commemorative Michael Rodrigues Plenum Expander, milled of the 1" billet aluminum plate, which adds 60 cu in to the overall plenum volume. It has a positive effect on cylinder filling in higher rpm band, as it acts as an in-line Helmholtz resonator coupled with the cylinder cavity volume.

How does it affect things in other RPM ranges?

[MrDangerUS]

Larger plenum vol. makes the TQ curve to raise earlier in rpm range and stay flatter (won't fall off at the higher rpms). Please go back to Dave's dyno plot and superimpose it against the "factory" plot. You'll see the difference.

http://www.thelotusforums.com/forums/index.php/topic/42263-412-bhpthat-will-do-nicely/

Edited May 22, 2011 by MrDangerUS

[MrDangerUS]

Just finished installing 85 micron Earl's (PN#230210) inline filter. I plumbed it between the fuel tank and primary pump and, of course, a new pump, which gave the ghost due to rust and crud coming with the fuel. My fuel accumulator failed, too. It sprung a small leak, probably due to the same reason. My after-the–pumps filter was full of brown sediment!

To avoid a "Sudden Death Syndrome", my advice to ALL pre 1989 Esprit owners is: take a precaution and install pre-filter. It is a sad situation, but there is nothing protecting your expensive pumps and accumulator.

Edited May 30, 2011 by MrDangerUS

[MrDangerUS]

FYI: Fabulous fuel injection and diesel EXPERT:

Owner, 50 years of experience and many European customers

Pumps rebuilding, injectors, calibration, etc,etc

HANS UTKE

H & R Fuel Injection Ltd.

(631) 589-1600

360 Knickerbocker Ave Ste 12

Bohemia, NY 11716

Edited June 10, 2011 by MrDangerUS

[MrDangerUS]

D-WUR FOR BOSCH CIS INJECTED ESPRITS

If you EVER considered adding intercooler, larger turbo or more boost - here is the device which makes it POSSIBLE!

I am are in the process of integrating it into my Esprit. Work in progress.

Here is a manual describing Digitally operated WUR.

UnwiredTools UTCIS™

Trbo Guys suppose to use UTCIS-PT.

http://unwiredtools.com/utcis-pt.asp

http://unwiredtools.com/manuals/UTCIS_Application_Guide_A2.pdf

If you are interested, PM me for a "Group Buy" discount.

Edited June 19, 2011 by MrDangerUS

[MrDangerUS]

"Thermal Ignition Valve", Lotus PN# B910E6792F

Part is Ford E1AE8A654G1A which is used on the 83 Mustang 2.3L engine. In US, at the local auto parts store or online, you can buy it as AIRTEX/WELLS 7P1095

Edited July 4, 2011 by MrDangerUS

[MrDangerUS]

Just got miy Laminove heat exchangers. The fun will begin soon: have to design and fabricate the new plenum/housing. Oh, well...

http://www.batinc.net/laminova.htm

http://www.laminova-online.se/

http://www.opcon.se/index.asp?sPage=1&langID=2&cID=15

http://208.109.215.220/files/intercool.pdf

[MrDangerUS]

Need to identify 1988 Esprit Turbo CIS turbocharger unit

88-92 Service Parts List shows turbo PN # C910E6372F.

However, according to the table below, this number belongs on 83-86 cars.

88 Esprit 2.2/16v should have A910E6959FA2.

I think the book is wrong...

http://115.47.103.117/Lotus/

Cold side A/R= 0.42

Turbine side=?

[MrDangerUS]

The Turbocharger on the USA Turbos with Bosch K Injection (86,87 & 88) are Garrett T3

Lotus Part No. C910E6372F (Listed in Lotus Parts Book)

Specification as follows :-

0.63 A/R Turbine

0.42 Comp

55 Trim Comp Wheel

Boost set at 0.66 Bar

The European cars from 88 MY (X180 Intro) had a Garrett T3 with 'Integral Wastegate'.

Lotus Part No. A910E6889F (Listed in Parts Book)

Specification as follows :-

0.63 A/R Turbine

0.42 Comp

55 Trim Comp Wheel

Boost set at 0.66 Bar

Thanks to Brian Angus at Lotus Hethel for the above info.

[MrDangerUS]

LOTUS ESPRIT - TURBOCHARGER UPGRADES

From 1980-87, Lotus used the T3 turbocharger. It has .63 a/r turbine and .42 a/r compressor.

It can be upgraded to compressor with super 60 a/r

like this one: http://www.mjmturbos...LotusTc0301.htm

When buying, you must specify if your turbo has an external wastegate.

From 1988-95, Lotus used also T3 but with an integral wastegate. Some folks say that this unit was smaller than the previous. It may be .48 a/r and .60 t3 compressor. The upgrade looks like this

http://www.mjmturbos...worth-Lotus.jpg

Then, all V8 has twin turbo but using smaller turbo than the above.

They used a Garrett T25 which could be upgraded to T28 instead of T25.

It looks like this http://www.mjmturbos...8hYBRIDt04B.htm

For info and questions see:

http://www.mjmturbos...urbolicious.htm

Edited August 29, 2011 by MrDangerUS

[sailorbob]

The S4 uses a turbo with a .48 turbine housing, part number A910E6959F.

Edited August 30, 2011 by sailorbob

[MrDangerUS]

Rich H,

Got a question for ya...

You are an expert on Porsches.

To get more flow out of the Esprit CIS system, one would need a greater capacity airflow meter (CIS fuel distributor head) intended for use with a 4 cyl, such as one from a Porsche 944 Turbo S, or better yet, a Porsche 968 Turbo and the injectors to with it.

944' may not work well, because displacements are almost the same (2.2), but 986 is 3.0L and higher flow.

Do you know if 968 is CIS or EFI?

Edited September 6, 2011 by MrDangerUS

[Rich H]

I replied to your PM but for the benefit of all:

Porsche 924 CIS is allegedly good for 240-250 bhp

Every Porsche from the 924S (so 924S 944, 968) is EFI

CIS was used on the 924, 924Turbo, 928 and contempery 911 but also on Fords, Volvos, BMW, Mercs, Saabs, etc.

2 solutions have been used on high powered 924 Turbos:

Fit an complete extra fuel system, so everything duplicated double up the injcectors, 2 AFMs, 2 pumps, etc, etc

Fit a 928 system and double up the injectors

The other solutions might be shim the fuel pressure regulator in the CIS unit that should give more fuel across the board

Any of the above will take a lto of work though!

[MrDangerUS]

HOW TO REBUILD CIS FUEL DISTRIBUTOR HEAD

see: http://forums.pelica...out-w-pics.html

Edited September 22, 2011 by MrDangerUS

[MrDangerUS]

Great variety of engine and fuel injector information,

http://users.erols.c...ss/tableifc.htm

Edited September 29, 2011 by MrDangerUS

[MrDangerUS]

TURBO UPGRADES & DISCUSSION

http://www.thelotusforums.com/forums/topic/12932-turbo-options/page__fromsearch__1