1986-88 Bosch CIS K-Jetronic injected Esprit specific items - Page 13 - LotusTalk - The Lotus Cars Community
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post #241 of 253 (permalink) Old 02-22-2019, 09:00 PM
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As I work down Mazlow's hierarchy of Lotus needs (apologies to Mazlow) I'm wondering if the waste gate of my '86 HCI Esprit needs rebuilding. It is after all 30 years old and if my boost gauge is to be believed it's limiting boost to about 7-8 psi (boost gauge doesn't go beyond 12:00 o'clock on the gauge) which is below what an HCI should kick in at, presumably 9.5 or so (about 1:00 o'clock on the boost gauge). Does anyone make a rebuild kit for these? Otherwise everything is working well so under the "if it ain't broke don't fix it" axiom I'm reluctant to take it apart unless there is a real benefit to be had. My OCD gene makes me want this to be functioning perfectly but my common sense tells me I should leave well enough alone. All opinions welcome.
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post #242 of 253 (permalink) Old 02-22-2019, 11:44 PM
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1986-88 Bosch CIS K-Jetronic injected Esprit specific items

Your wastegate working fine. Long story but factory put in a spacer limiting it to 7 PSI. If you look at it and clean the grime off it will be stamped on the spacer edge. I have a picture somewhere on lotus talk.

You can remove the spacer - while I haven’t done it , MRDANGERUS has various postings on this topic.

Just saw now - post 236 previously has a photo of the waste gate and spacer and the details by MRDANGERUS.

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post #243 of 253 (permalink) Old 02-23-2019, 01:23 PM
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Thanks Eddie. I'll probably leave it as it is for now.
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post #244 of 253 (permalink) Old 02-23-2019, 01:46 PM Thread Starter
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Thanks Eddie. I'll probably leave it as it is for now.
86' MY cars had their boost limited because it was a mix bag. Only late cars had forged pistons (running change Lotus-style).
If you're not sure what's inside your engine, stay on the safe side and do nothing.
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post #245 of 253 (permalink) Old 02-23-2019, 02:27 PM
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Thanks Eddie. I'll probably leave it as it is for now.


Yes. While 2.5 lbs of extra boost is seductive, ‘ if it ain’t broke, don’t “fix” it’.


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post #246 of 253 (permalink) Old 02-24-2019, 08:37 PM
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86' MY cars had their boost limited because it was a mix bag. Only late cars had forged pistons (running change Lotus-style).
If you're not sure what's inside your engine, stay on the safe side and do nothing.
First time I heard of this info. Sounds normal - running change during model year.

I also heard the cast piston engines had black-painted cam covers/intakes vs. the 'HCI' forged piston Turbo engines.
However, that was hearsay and I don't have any hard reliable sources to confirm it.

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post #247 of 253 (permalink) Old 02-25-2019, 08:56 AM
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Seems it would be easy to confirm what's in the engine based on the engine serial number - if Lotus would ever tell you. If there are any "pre" HCI cars in the US I would doubt there are many as selling HCI versions that weren't really HCI would get you into hot water pretty quickly, especially on cars like mine that had HCI badging from the factory. Lotus may have played a few games here and there but I don't think they were stupid.
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post #248 of 253 (permalink) Old 03-21-2019, 08:20 AM Thread Starter
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Today, I took my turbo apart, no part number nor plate, which makes me think it could have been rebuilt by PO.
I measured its guts:

FYI: my "old" turbo................................OE GT0301 (junked)

Exhaust Turbine:
-Inducer = 58.00mm.....................................?
-Exducer = 46.50mm.................................45.50mm
-Wheel height = 26.00mm...............................?
-Hub diam. = 16.00mm..............................16.00mm

Compressor: 0.42 A/R
-Inducer = 46.50mm, smooth bore..............45.00mm ! has a reduction step, see last pic
-Exducer = 60.00mm.....................................?
-Wheel height = 18.00mm..............................?
-Hub diam. = 14.70mm..............................14.70mm
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Here is a great upgrade for Turbo Esprits with external w/gates:

https://www.atpturbo.com/mm5/merchan...egory_Code=NEW
Garrett T3 Twinscroll Turbine Housing in Ni-Resist For GT30R/GTX30R .61 A/R : atpturbo.com

COMPATIBLE GARRETT TURBO MODELS:
* GT3071R (60mm turbine wheel)
* GT3076R (60mm turbine wheel)

Why?
Here is an explanation of advantages of the twin-scroll turbos
https://dsportmag.com/the-tech/twin-...-great-divide/


DD always required!
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post #249 of 253 (permalink) Old 04-21-2019, 05:43 AM Thread Starter
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CIS Injected V16 Super Car: Ferrarighini Testadiablo

When the CIS injection ruled the World...

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Last edited by MRDANGERUS; 04-21-2019 at 07:02 AM.
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post #250 of 253 (permalink) Old 04-21-2019, 07:21 PM
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INTERESTING Mr D. I remember when that car was in all the magazines. Great Video. Thanks for posting!
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post #251 of 253 (permalink) Old 05-02-2019, 03:10 PM Thread Starter
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post #252 of 253 (permalink) Old 05-02-2019, 09:22 PM Thread Starter
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Displacing 6.0 liters, the V-16 featured 64 valves, eight camshafts, two Bosch CIS fuel-injection systems, four cylinder heads, and 4 twin timing chains. It produced a claimed 540 horsepower at 8,000 rpm and 400 lb-ft of torque at 6000 rpm.

Here is the story of Cizeta: https://www.hagerty.com/articles-vid...a-moroder-v16t
.
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post #253 of 253 (permalink) Old 05-03-2019, 04:43 AM
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It's conceptually two V-8's mated together. That's an approach GM used on producing marine application diesels I used to work on back in my maritime days. I once worked on a tug that had 3 sequences of GM diesels, V-4's to run the generators, V-8's to run the winch, and v-16's to power the vessel by turning the props. Lots of interchangeable parts!

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