Search found 76 matches

by marek
Tue May 23, 2017 9:20 pm
Forum: Running a V8 on LPG
Topic: TVR Chimaera LPG Conversion Advice
Replies: 70
Views: 18806

Re: TVR Chimaera LPG Conversion Advice

Dear Simon, One reason why you may be seeing larger temperature variations than the original poster or myself could be in how installations are configured. In my case, the car has 20 litres of coolant and ALL of it runs through the reducers. This may account for why I see relatively little movement ...
by marek
Mon May 22, 2017 1:57 pm
Forum: Running a V8 on LPG
Topic: TVR Chimaera LPG Conversion Advice
Replies: 70
Views: 18806

Re: TVR Chimaera LPG Conversion Advice

Hi Marek, If you have a discrete stand alone map for LPG, why the need for a short pulse-width calibration graph? The stand alone software lets you set up different injectors with different dead times and different low pulsewidths charcteristics. It then lets you set up basic fuelling for all cylin...
by marek
Mon May 22, 2017 1:39 pm
Forum: Running a V8 on LPG
Topic: TVR Chimaera LPG Conversion Advice
Replies: 70
Views: 18806

Re: TVR Chimaera LPG Conversion Advice

Dear Simon, I'm not sure why you are taking the discussion in the direction of injector characteristics, as it doesn't really have too much relevance to the OP's thread. Most people will chose injectors which are linear over their full operating range and/or adjust the default rail pressure such tha...
by marek
Sun May 21, 2017 12:24 am
Forum: Running a V8 on LPG
Topic: TVR Chimaera LPG Conversion Advice
Replies: 70
Views: 18806

Re: TVR Chimaera LPG Conversion Advice

Dear Simon, Both approaches mentioned factor in "injector response":- The aftermarket stand alone ECUs such as Megasquirt or the Canems one have an injector calibration settings which dial in the injector speed or "dead time", per injector plus even a voltage correction for that. The "dead time" is ...
by marek
Wed May 17, 2017 11:53 am
Forum: Running a V8 on LPG
Topic: TVR Chimaera LPG Conversion Advice
Replies: 70
Views: 18806

Re: TVR Chimaera LPG Conversion Advice

I don't have a problem with either of the last two posts. Cop11 is a very useful document and it is of great assistance to the amateur who gets an insight into how a professional is to be asked to approach a conversion. Similarly, any diagnostic tools that can be made available to the end user are a...
by marek
Tue May 16, 2017 10:57 pm
Forum: Running a V8 on LPG
Topic: TVR Chimaera LPG Conversion Advice
Replies: 70
Views: 18806

Re: TVR Chimaera LPG Conversion Advice

There seems to be plenty lack of understanding, or at least lack of thinking around the toipic, appearing in this thread all of a sudden. OEM ECUs will OBDB compliant because of outside regulation. This means that a mechanic unfamiliar with that particular car can quickly ascertain what is causing a...
by marek
Fri Oct 07, 2016 5:51 pm
Forum: Tell us your Story
Topic: 1998 BMW 740i - DIY Conversion using Prins VSI 2.0
Replies: 33
Views: 12059

Re: 1998 BMW 740i - DIY Conversion using Prins VSI 2.0

Any form of angle iron is much stronger than a flat bar. If space is a problem, start with an angle iron piece and cut 90% of one of the halves off. This still leaves you a structure with rigidity which the flat bar never had.

kind regards
Marek
by marek
Fri Oct 07, 2016 3:54 pm
Forum: Tell us your Story
Topic: 1998 BMW 740i - DIY Conversion using Prins VSI 2.0
Replies: 33
Views: 12059

Re: 1998 BMW 740i - DIY Conversion using Prins VSI 2.0

A 2mm thick piece of steel isn't going to hold a tank which may weigh 70kg or more. It may limit its movement in one plane, but it'll still be resting on the bottom bolt as before. To gauge (sic) what is needed, see if the proposed strap deflects when you put your body weight onto it. A 5-6mm thick ...
by marek
Tue Jun 21, 2016 6:23 pm
Forum: General Discussion
Topic: Jaguar v12
Replies: 8
Views: 1746

Re: Jaguar v12

You may be making more work for yourself than you really need to. If you want to go fully sequential using Megasquirt, then it'll be by using MS3/3X or MS3pro. In this case, the MS3 will be easily be able to handle both the petrol and lpg itself fully sequentially and there is no need to bother with...
by marek
Sat Jun 04, 2016 10:28 pm
Forum: General Discussion
Topic: Jaguar v12
Replies: 8
Views: 1746

Re: Jaguar v12

I haven't checked the lpg forum for quite some time. Your car is batch fired, in four groups of three injectors each. You car runs a Lucas 16CU controller, for which you can find plenty of data on the AJ6 website, just search for "Roger Bywater" to find it. I have a fully sequential LPG and petrol s...
by marek
Wed Jun 25, 2014 4:39 pm
Forum: Tell us your Story
Topic: turbo astra new problem oi vey ..
Replies: 102
Views: 23071

Re: turbo astra single point project .

Dear Rob, If you have a wideband lambda sensor hooked up, you can do a test to determine the injector "dead" time:- holding it at a constant medium to high rpm, run it at 2 squirts per cycle and note the lambda reading. Switch to a different numbers of squirts per cycle (e.g. 1) and note whether the...
by marek
Wed Jun 04, 2014 8:21 am
Forum: General Discussion
Topic: UKLPG comments
Replies: 578
Views: 48776

Re: UKLPG comments

Dear Simon, Whilst your dislike of the approach taken by the trade body and its influence over the insurance industry is understood, moving towards a statutory framework of some sorts may have unforseen consequences:- It is likely that anything which will be acceptable at government level inevitably...
by marek
Fri Mar 07, 2014 8:54 am
Forum: General Discussion
Topic: not less than 4.1ms on gas?
Replies: 18
Views: 1378

Re: not less than 4.1ms on gas?

Dear Carl, To answer your question, that equates to a "minimum gas time", as you put it, of 1.2mSec. Consider the following scenarios:- Any commanded pulse lower than 2.36mSec does not even open the injector - no gas flows. At any commanded pulse width above 2.36mSec, e.g. a commanded pulse of 2.37 ...
by marek
Thu Jan 30, 2014 9:56 am
Forum: General Discussion
Topic: Starting on LPG from cold?
Replies: 14
Views: 1884

Re: Starting on LPG from cold?

Correctly fuelled, the engine will start just as quickly on lpg as it will on petrol. The only material difference is that there will be no unatomised (liquid) petrol collecting on the bores at startup. With a cold start on petrol, this unatomised fuel will wash the thin lubricating oil film from th...
by marek
Fri Jan 10, 2014 10:29 am
Forum: General Discussion
Topic: UKLPG comments
Replies: 578
Views: 48776

Re: UKLPG comments

All the the quoted documents cover roughly the same ground with a lot of overlap but from a slightly different perspective and with slightly different aims. The reason it is worth having this discussion is that Simon floated the idea of doing away with the compliance with cop11 and subsequent entry ...
by marek
Thu Jan 09, 2014 9:21 pm
Forum: General Discussion
Topic: UKLPG comments
Replies: 578
Views: 48776

Re: UKLPG comments

Dear Mr Gilbert, The logic is very simple on both points. Perhaps a summary would go as follows:- - E67 is relevant if you are offering items for sale within the EU E67 doesn't apply if you aren't offering the parts for sale. If a third party approaches a.n.other and asks them to design and build a ...
by marek
Thu Jan 09, 2014 7:02 pm
Forum: General Discussion
Topic: UKLPG comments
Replies: 578
Views: 48776

Re: UKLPG comments

Dear Mr Gilbert, We are in agreement, but Simon thinks it is a "standard". It is extremely convenient for UKLPG that most of the conditions appear to be safety related but it's sole aim is to stop qualifying non-compliant items from entering the retail chain within the EU. It's deliberately worded t...
by marek
Thu Jan 09, 2014 4:14 pm
Forum: General Discussion
Topic: UKLPG comments
Replies: 578
Views: 48776

Re: UKLPG comments

UKLPG took existing European standards, made small adjustments, re-packaged them and passed them off as their own standards. Dear Simon, That's not quite right:- different EU countries have different laws. E67 is not "a standard". If you are referring to E67, then that is a directive which prohibit...
by marek
Tue Oct 22, 2013 9:24 pm
Forum: General Discussion
Topic: in theory, could you run an LPG converted car on Hydrogen?
Replies: 27
Views: 1914

Re: in theory, could you run an LPG converted car on Hydroge

I think you are all missing the point:- the whole hydrogen concept with our conventional engines only makes any sense if the presence of some quantity of hydrogen promotes or allows the more efficient combustion of the primary fuel source (lpg or petrol or diesel) via some alternative reaction, i.e....
by marek
Thu Jun 20, 2013 9:57 pm
Forum: General Discussion
Topic: KME reducer adjustment
Replies: 2
Views: 353

Re: KME reducer adjustment

Thank you