L-jetronic

[WERNER_HAUSSMANN at HP-Loveland-om2.om.hp.com]

Hi Orin

Yes the car runs good with the Bosch system.  I increased the pressure at the 
injector to 17.5lb, and loosened the spring at the air meter by two notches.  
That worked real good. I later found a way to increase fuel flow by modifying 
the analog computer.  This allowed me to use a standard air meter.

The thing I want to do now is delete the trottle switch for enrichment. I never 
got it to fit well. I am looking for a vacuum switch for the fuel enrichment.  
The L-Jetronic system you used has such a switch. Do you have the Bosch number 
or do you have one?  

The injector I am using is four times a standard 288 cc/sec flow.  I am doing 
this by memory, so it may be wrong. I gave you the PN  for that injector.



Werner




______________________________ Reply Separator _________________________________
Subject: Re: L-jetronic
Author:  Non-HP-orin (orin at nr.infi.net) at HP-ColSprings,shargw2
Date:    3/5/96 7:45 AM


-- [ From: Orin Harding * EMC.Ver #2.5.02 ] --

Werner,
Did you ever find out what the flow specs. are for the Ford (Bosch) 
injectors are???  I remember you said that you were having trouble with the 
system running lean on the "B"..I had the same problem when I tried your 
approach and never could get the thing to run as I would like.  I also never 
overcame the cold start problems..You know, on very cold days it would idle 
very rough...Warm days ok, but cold days really bad.  I have switched over 
to the Electromotive TEC II and it runs fine, although a little lean, but 
the system is very expensive and defeated the real purpose...A cheap 
replacement for the SU's or Zenith carbs...Let me know how you're making out 
...

Orin
-------- REPLY, Original message follows --------

Date: Monday, 04-Mar-96 04:45 PM

From: WERNER_HAUSSMANN at HP-Loveland-om2.om.hp.com \ Internet:   
(werner_haussmann at hp-loveland-om2.om.hp.com)
To:   DIY_EFI at coulomb.eng.ohio-state.edu \ Internet:   
(diy_efi at coulomb.eng.ohio-state.edu)

Subject: Re: L-jetronic

Item Subject: L-jetronic
Hi James

I'm new at this list, so I don't know if I should reply to each person, or 
send my reply to DIY_EFI.  I never did see my own message, so I don't know 
how everyone else saw it. Am I getting other peoples messages?


Anyway, James, you're not confused.  The my L-Jetronic does have an air 
meter.  It also has a lambda sensor. At 2/3 or more trottle a switch  closes 
, and the lambda sensor circuit is disconnected, the mixture gets  richer by 
about 4% for a little more power and knock protection.  Later (  oh.... 
about '86) the trottle switch was replaced with a vacuum switch to  sense 
the manifold.  This way even when the trottle is opened only half way  at 
low rpm, the vacuum drops, the switch closes and the mixture goes rich  by 
~4%.


James, thanks for the offer of the '79 Supra, but no. I have all the parts 
I need, except this vacuum switch to replace the switch on the trottle 
shaft.


The parts came from a '83 Renault Fuego. Most of the information came from 
the Bosch FI book ( I don't have the author handy) the the FI book by 
Hartman.  


Actual data is very hard to come by.  I had no luck getting data from  Bosch 
.  If you need specifics I may be able to help.  But not much.



Werner







______________________________ Forward Header __________________________ 
Subject: Re: L-jetronic
Author:  Non-HP-james (james at brc.ubc.ca) at HP-ColSprings,mimegw2 
Date:    3/4/96 4:21 PM




Werner, I thought that the L-jetronic (1979 and on) used an air flow 
meter, manifold vacuum to control A/F ratio????
The later LH-jetronic added and oxygen sensor.  Am I confused???

Anyway I have a friend with a '79 Toyota Supra that has died at my  parents 
place.  I might be able to persuade him to part it out.  It has  the LH- 
jetronic and except for a couple of fuel pressure hoses the system  works 
fine.  Are you interested at all????  The car has blown a head  gasket and 
thus he's got to tow it away to a wrecker and he'll probably  get nothing 
for it.


Sorry Werner I forgot to ask you if your L-type was a speed  density system? 
??  Where did you get your parts from for the conversion  (ie. what car that 
is?)   Do you have a good reference book that gives  physical data on 
different sensors??  Like resistance of different coolant  temp. sensors and 
whether they change their resistance in a  linear,  geometric or logarithmic 
fashion????? 

Thanks in advance

jw


-------- REPLY, End of original message --------