S4s,S4,SE UPDATES & IMPROVEMENTS - LotusTalk - The Lotus Cars Community
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post #1 of 163 (permalink) Old 01-15-2018, 12:04 PM Thread Starter
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S4s UPDATES & IMPROVEMENTS

OK, many of you probably took a wager how soon I start modifying my new car.
Yep, here we go...
Improvements and upgrades, of course, why not... I'm not going to go Ape-ballistic like on my 88"ET, though.
Who won the bet? LOL.

FYI: Struts-hold open, rear hatch
On Amazon, price $22 Prime/pair

Search for:
BOXI 2pcs Gas Charged Universal Lift Supports Struts Shocks Springs Dampers Extended Length 19.70 inches, Compressed Length 11.75 inches, 75 lbs Force,10mm Ball Sockets 6938

If you have a glass hatch and/or wing you need 90 lbs force due to an additional weight.

Last edited by MRDANGERUS; 01-23-2018 at 10:43 AM.
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post #2 of 163 (permalink) Old 01-15-2018, 03:17 PM
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Looks like they do not have the electrical connectors for the CHMSL so would not work for most applications except the S4s
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post #3 of 163 (permalink) Old 01-15-2018, 09:43 PM Thread Starter
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post #4 of 163 (permalink) Old 01-16-2018, 08:48 AM Thread Starter
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Have you looked under your chargecooler, Lately? Well, I did!
And... I found a surprise waiting!

One of the vacuum/boost lines came off the plastic Tee. I noticed, that once upon a time, someone replaced a short section of the line between one way valve and the manifold Tee with silicone hose!
Silicone has a bad habit of swelling and getting mushy (what-t-a technical lingo!), and eventually disintegrates in a presence of the oil vapours.

Quick fix: replace any silicone vac. line with rubber and add mini tie wraps or metal clips to prevent slipping off under boost.

Whilst the CC is off, a nice thick layer of Thermo-Tec insulation should be attached to the bottom to minimize thermal absorption of the engine heat by the CC.
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Last edited by MRDANGERUS; 01-23-2018 at 10:44 AM.
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post #5 of 163 (permalink) Old 01-16-2018, 09:33 AM
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I like the 'old school' photo labeling!

Time to replace ALL of the vacuum tubing on that 20+year old car...

Atwell Haines
'88 Esprit
Succasunna, NJ USA


"Not all angels have wings." - Turbo R
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post #6 of 163 (permalink) Old 01-16-2018, 11:05 AM
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#2 Very important = MAP sensor line. Cracks in rubber elbow common, leads to real running problems, idles ok, but does not run well under any load.

#1 very important, increases fuel pressure with boost! Line from intake manifold internal pressure rail to fuel pressure regulator is very important, as is the one way check valve between that and the crank case breather. Valve must be the correct direction to prevent boost loss at fuel pressure regulator!
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post #7 of 163 (permalink) Old 01-16-2018, 11:45 AM
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Quote:
Originally Posted by Vulcan Grey View Post
#2 Very important = MAP sensor line. Cracks in rubber elbow common, leads to real running problems, idles ok, but does not run well under any load.

#1 very important, increases fuel pressure with boost! Line from intake manifold internal pressure rail to fuel pressure regulator is very important, as is the one way check valve between that and the crank case breather. Valve must be the correct direction to prevent boost loss at fuel pressure regulator!
I've had experience with #1. I had trouble maintaining full boost and found #1 disconnected. It made a big difference when fixed. The engine was a lot noisier with it disconnected as well, sounded like valves tapping.

Pete
94 S4
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post #8 of 163 (permalink) Old 01-16-2018, 12:02 PM
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Quote:
Originally Posted by MRDANGERUS View Post
Just unscrew the plastic ends and transfer the connectors from your old ones. Fast and easy!
Sounded like a plan, thought i would give it a whirl, but......Amazon wont ship those to Canada! others no problem, those no As you can see we pay a LOT more for things up here



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post #9 of 163 (permalink) Old 01-17-2018, 09:00 AM
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Are those hoses/connections visible with the CC in place? Pete's comment about 'sounds like valves tapping' is something I'm hearing.
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post #10 of 163 (permalink) Old 01-17-2018, 11:52 AM
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They are somewhat visible, but if you just loosen the chargecooler mounting bolts, grounding strap, and the intake silicone hoses, you can easily swing the chargecooler out of the way without draining the coolant.


An intake manifold leak at that location (the rail for the MAP sensor, IAC valve, and crankcase breather) definitely sounds like valve clatter.


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post #11 of 163 (permalink) Old 01-17-2018, 11:59 AM
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Quote:
Originally Posted by pete inno View Post
I've had experience with #1. I had trouble maintaining full boost and found #1 disconnected. It made a big difference when fixed. The engine was a lot noisier with it disconnected as well, sounded like valves tapping.
Under boost, that is the sound of detonation!

1988 Lotus Esprit Turbo
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post #12 of 163 (permalink) Old 01-17-2018, 12:51 PM
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Under boost, that is the sound of detonation!
No, at any engine speed.
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post #13 of 163 (permalink) Old 01-17-2018, 12:53 PM
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Quote:
Originally Posted by BobWeber View Post
Are those hoses/connections visible with the CC in place? Pete's comment about 'sounds like valves tapping' is something I'm hearing.
The chargecooler completely hid the problem. I did the same as Travis suggested and then it was obvious.

Pete
94 S4
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post #14 of 163 (permalink) Old 01-17-2018, 02:28 PM
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No, at any engine speed.
That's good news!

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post #15 of 163 (permalink) Old 01-17-2018, 05:41 PM Thread Starter
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What is the best spot to connect BOV signal line?
I assume, that the upper rail should be used for this purpose?
.

Last edited by MRDANGERUS; 01-19-2018 at 06:17 PM.
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post #16 of 163 (permalink) Old 01-19-2018, 06:26 PM Thread Starter
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Porting Inlets

Whilst poking around the charge cooler, it may be prudent to port inlets of the CC and the diffuser.
According to Garry Kemp, this could improve the air flow as much as 10-12 cfm.
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Last edited by MRDANGERUS; 01-23-2018 at 10:46 AM.
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post #17 of 163 (permalink) Old 01-19-2018, 07:51 PM
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Saw that on Dermot's old website where he radiused the inlets and matched mating surfaces to the gaskets.
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post #18 of 163 (permalink) Old 01-23-2018, 10:35 AM Thread Starter
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Programmable windshield wiper for your S4/ S4S

See the file I attached.... http://www.lotusespritworld.com/EGui...ammeWiper.html


A small relay from VW / Audi works really well and it is just a swap....
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post #19 of 163 (permalink) Old 01-23-2018, 10:39 AM
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You drive your car in the rain??
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post #20 of 163 (permalink) Old 01-23-2018, 10:51 AM Thread Starter
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Have never done that, but what if you get caught away from home base?

You carry life preservers, does it mean you intend to scuttle your boat?
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