Lotus esprit turbo (chargecooled)

[910esprit]

Engine Mfg: LOTUS
Engine Code: 910
Cylinders: 4
Displacement (cc): 2174CC
Rev Limit: 6000
TPS or MAP: MAP
Boosted or Normally Aspirated: Boosted
If Boosted- max Pressure (KPa): 166 controlled by MJLT output.
Modifications: 8.0 to 1 compression chrome top pistons Nickosil aluminium liners. Chargecooler. SE manifold and Turbo. colder plugs. Tripple core coolant rad, uprated oil cooler.
Chassis: Lotus with adjustable shocks and HISPEC motorsport brake conversion.
Notes: Knock seensor with gauge in cab. The engine kept destroying itself due to detonation, the lotus dizzy had advance wieghts only and went from 12 degrees to 28 degrees at 3500rpm and that was it...... 28 degrees at full boost is asking for trouble, the only option was some form of electronic mappable control, the MJLT fitted the bill perectly. The motor is so smooth and pulls so strong (70-90 in just over 3 sec in top gear) that i have reduced the rev limit from 7000 to 6000 and don't miss the extra 1000 at all. It will also pull from 1000 rpm to redline in 4th and not miss a beat LOVE IT!!!!

[sierra2dr]

I can't evaluate/work in kilopascal,only psi. So your 166 KPA equates to 24psi fookin'ell,that is some boost going through a pair of dells,very impessed. There must be hope for my pinto then

[910esprit]

I can't evaluate/work in kilopascal,only psi. So your 166 KPA equates to 24psi fookin'ell,that is some boost going through a pair of dells,very impessed. There must be hope for my pinto then

I am not that brave!!!!! 24psi absolute that is 24-14(atmospheric) which gives a grand total of 10PSI.... I cant afford the rebuilds anymore

[sierra2dr]

oh right,I got carried away there. I'm none the wiser,is 40° normal for idle speed @ 1000rpm?

[910esprit]

oh right,I got carried away there. I'm none the wiser,is 40° normal for idle speed @ 1000rpm?

The first bin is the cranking speed advance setting and this engine starts very well with a lot of advance....40degrees is a good setting for cranking.... this engine can be a bit of a pig when hot to start on standard advance..

[MrDangerUS]

I can't evaluate/work in kilopascal,only psi. So your 166 KPA equates to 24psi fookin'ell,that is some boost going through a pair of dells,very impessed. There must be hope for my pinto then

I am not that brave!!!!! 24psi absolute that is 24-14(atmospheric) which gives a grand total of 10PSI.... I cant afford the rebuilds anymore

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Hello 910,

To prevent detonation you may install an individual cylinder retard processor http://www.jandssafeguard.com/VampirePage/Vampire.html
The control system retards only the knocking cylinders, maximizing power while protecting the engine.
The system also features boost retard and nitrous or switched retard.
The boost retard section includes Start and Rate controls, allowing you to tailor the retard curve to your needs.

FYI:
Here, attached, please find 88 Esprit Turbo dizzy mechanical advance/retard mapping. You may compare these empirical findings to your own map to confirm or tweak yours.

DIZZY MAPING, X180, 1988
Copied from:
http://www.thelotusforums.com/forums/to ... +%2Btiming

Here is what we did:
we recorded the map as it is on my ’88 turbo. We needed this as a reference because SHB662 did rebuild his distributor and wanted life measurements to compare.

Here they are:
Centrufugal advance:
First we disconnected al the (vacuum/turbo) tubes of the distributor. Then started to increase the rpm and measured the advance whith digital timing equipment.
(10° Advace at 1000 rpm is the initial setting)

RPM, Timing BTDC °
1000 10
1100 12
1200 14
1300 15,5
1400 17
1500 21
1600 23
1700 23
1800 23
1900 20
2000 20
2100 20
2200 20
2300 20
2400 19
2500 19
2600 19
2700 19
2800 18
2900 18
3000 18
3100 18
3200 18
3300 18
3400 18
3500 18
3600 18
3700 18
3800 18
3900 18
4000 18
4100 18
4200 18
4300 18
4400 18
4500 18
4600 18
4700 18
4800 18
4900 18



Vacuum advance:

Al tubes still disconnected. Then connect a tube at the “turbo” pressure side of the vacuum plenum of the distributor. At a steady rpm of 1000, we started to feed pressure to the vacuum advance and measured the preignition whit digital timing equipment.

(10° Advace at 1000 rpm is the initial setting)

Pressure/mBar, Advance °
0 10
50 10
90 14
100 22
150 26
200 32
300 34
400 34
500 34
600 34
700 34
800 34
900 34
1000 34


Thank you Peter that I could use your digital timing equipment for measuring also my ignition advance (see tables below).
In the Lotus service notes it is indicated that the centrifugal advance is 11° extra at 2000 rpm and only 8° extra at 5000 rpm. Initially I thought that this 8°at 5000 rpm was a mistake and I would expect rather 18° extra advance!!!? I still wonder how the centrifugal advance can decrease at a higher rpm? What special mechanism is inside the original distributor? anyway regarding to Peter's results it seems to be correct!
The distributor in my esprit is rebuild see my topic "distributor issuesof carb-turbo(1988)" posted at 25 oct 2008.
I wonder if I should take actions to improve the curve of my centrifugal advance?
centrifugal advance.xls 16.5K 32 downloads

I have the feeling that something is wrong with the attached spreadsheet,
here is the complete spreadsheet of the static, vacuum and centrifugal advance of my car Ignition advance tables.xls 29K 36 downloads

[MrDangerUS]

I downloaded the MJ map from here
BUT,
I can't open the file

File: new super. mjlj

I'm getting this message: "To open this file, Windows needs to know what program created it."

Do you know what program/application to use to open it?

Thanks

[MrDangerUS]

PING!!! Any one, please?

ALSO: I tried to download this map and I'm getting this error message:
"Super.mjlj is not a valid Win32 application"

What should I do differently? Please advise.