Re: EFI vs CIS

[Gerard <gerard@poboxes.com>]

> To justify bigger and 'better' one should demonstrate need.  I would
> argue most that consider EFI, haven't done the basics to justify the
> need.  Does it work?  You betcha.  Is CIS keeping you from going fast
> and tweeking your car. Nope.  Is EFI the answer?  Depends.  What else
> ya got?

I am a big culprit in this regard. I haven't done a single mod as yet,
I am still battling to iron out the general faults that have arisen
from 118,000km of wear and tear on my 200t. My interest in EFI is
not purely academic, even though I am going to be monitoring a thread
like this pretty closely without doing work on a conversion to my car
as such, I do wish to put in an EFI as I do see it having more benefits
over the mechanical system and, besides, I'm a computer nut and wish
to have more control!! :) However, while monitoring the thread and
learning about how to do this and what pitfalls to look out for I will
be fixing my 200t to factory spec and then modifying the CIS-E from
QL info (ECU and mechanical fuel feed system) to get some more power
out of it all. I asked the questions to find out how much work is
involved and whether it is worth it; based on info I get here and
how much I can get out of my CIS system (in the future) and also based
on what job I end up eventually and how much dough I can come up with
(currently unemployed, but hunting work!) in the future I will decide
on a conversion or to mod up the CIS and stop there.

Do I need EFI? No, I don't think so. Do I want EFI? Yeah. :) Granted
CIS cars can still develop whopping amounts of power (a lot of Qlisters
can attest to that), I think the EFI systems look less restrictive.
Less restriction, more benefits, right? Would it be silly to say that
a motor with EFI has more potential with less work compared to a CIS
motor? (That assumes both the EFI and CIS cars came with the systems
installed, no conversion necessary)

Perhaps it would be best to discuss the benefits (if any) that a EFI
conversion can offer over the stock CIS, that way we have a starting
point or reference for other future listers who are thinking about it
and would like to know whether it is worth it or not. See what I'm
getting at? EFI conversion is not essential, you can still get a lot
of punch out of CIS, so put forward information and details of benefits
and pitfalls of both systems in order to inform future listers (and
myself) of what can be expected from a conversion. So, discuss
benefits before presenting various market sources for conversions.

> The key to mods is lambda = 1, from 825rpm > redline.  That's all. 
> Can EFI do it?  Yup.  Can CIS do it?  Yup.  Ok, where do we go from
> here?  I wouldn't consider a swap from EFI to CIS.  However, I don't
> think it's anymore necessary to go the opposite way either.

My worry is how to control the proper fuel feed with the K-Jet fuel
feed. EFI has more control of this and would, to me, seem safer in
avoiding those scary lean running conditions at the top end.

Once again, I don't need EFI right away but would like to research
its viability towards a more efficient motor. I'm still going through
hell fixing my car while unemployed, after that comes my CIS-E mods
and depending on how things go with work and motor I would like to
delve into something like EFI to see how much better it is. By that
point I guess I'll have done some work to the CIS-E I have and the
motor should be giving quite a kick, so lets see what EFI can offer
over CIS as a reference for this thread.

G.
-- 
"a thousand miles from here, there is another person smiling"
1990 Turbo (200t, MAC13A ECU, 1.4-1.6 bar, FWD auto)
name   : gerard van vught
tel    : +27-21-696 0331 (h) / 082 923 9609 (cell)
url    : http://www.poboxes.com/gerard/
e-mail : gerard@poboxes.com  / han.solo@galaxycorp.com