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MarkKassim - The Lotus Forums #ForTheOwners Jump to content


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MarkKassim last won the day on July 15 2013

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About MarkKassim

  • Birthday 05/04/1970

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  • Name
    Mark K
  • Car
    Esprit Turbo SE
  • Modifications
    Alunox Full System Ex,upgraded Charge Cooler ,V8 Wheels , K6 ECU, PNM suspension and 4 pot Hi Spec Brakes
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  1. Hi Guys, the charge cooler has changed slightly from the link you have there , its now more compact It is about 3 time the volume of the original and maintains the same flow layout, so fitting is quite easy. The water hose connections come at the standard size which i think is around 16mm. However Alunox can supply with larger ones as shown here at 19mm . I can only speak from my own experience , it did hold up well with new BorgWarner 6258-G turbo on the dyno running higher flow and boost. I don't have a photo of the original unit as yet but I will try and get one. The standard unit will be a direct replacement for the original, built to the same dimensions. Mark K
  2. Hi Guys, I've been in touch with Ben about another group buy for the Esprit 321 Stainless Steel Manifold if anyone would be interested. The prices Ben posted earlier in this thread are still current. These are the details of a group buy if we get the interest 30 units in total - mixed G Car and Stevens Fitting kit - All gaskets and Stainless nuts included G Car GB price including TurboSmart external wastegate £1650 normal list price £1950 Stevens car manifold - £1150 normal list price £1350 Rear system G Car 2.5” - £650 normal list price £850 Rear System Twin Exit Stevens car 2.5” £600 normal list price £750 - based on min 10 units Rear System Twin Exit Stevens car 3” £780 normal list price £950 based on min 10 units Special requests for T4 flange for turbo upgrade can be included in this GB, I will get the GB price on request Also the Charge Coolers can be in a separate group buy Standard charge cooler £500 normal list price £750 - based on min 10 units Uprated charge cooler £700 normal list price £1100 - based on min 10 units I will get more info on the standard unit as this is new, I believe it has the same dimensions as the original charge cooler. All prices are plus VAT and postage If you have an interest in any of the above let me know and I can create a Group Buy thread. For anyone considering the Alunox 321 SS manifold for the first time, they have been around now for about 10 years with no reported failures. Mark
  3. Thanks guys for your great feedback, your comments are much appreciated. The transition is unmodified but the clutch is uprated, Dave helped me out with the specification of this putting together some of his old parts. The pressure plate and friction plate are AP capable of holding 330 lb/ft. I may be pushing my look if I go much further with the transmission. Mark K
  4. Hi Robin, Yes that is a twin scroll manifold and if you have the normal Alunox manifold it is also a twin scroll as Barry has stated. My particular manifold design has been adapted in the final section (Collector) for the T4 turbo instead of the standard T3. This is the size of the T3 Flange vs the T4 Flange Sorry its not the best picture, the Collector design has been enlarged to match the bigger port sizes of the T4 flange. Hope this helps, Mark
  5. Hi Thomas, Yes it is an expensive dyno that can hold static loads and so tune each speed site or cell in turn. During part of the video you could hear him holding constant RPMs while he dialled in the speed sites. I think this formed part of the base mapping Later on the power runs he tunes the Boost control. I'm not running a Knock sensor so its pretty much tuned under load avoiding detonation (knock), so it may not be as close minimum you are looking for. I forgot to mention I am running a wide band lambda sensor and EGT sensor (PLX) Just out of interest what ECU are you running. Hope the table helps Mark
  6. Alunox Manifold with EFR 6258-G Twin scroll Turbo upgrade for the 4-cylinder Lotus Esprit After some research into different turbo upgrades available on the market, I decided to go with the BorgWarner EFR 6258-G Twin Scroll unit supplied by Van Der Lee Turbo systems (Jaap), to replace the Esprit’s single scroll turbo charger. One of the biggest limitations of most factory single-scroll turbo system is the restrictive nature of its log or compact unequal-length exhaust manifold. The design characteristics of both Manifold and Turbo were honed with collaboration between both Van Der Lee Turbo systems and Alunox engineers. Bringing the two companies together allowed me to get a twin-scroll (pulse) turbocharger system yielding maximum efficiency. Divided or "twin-scroll" turbos and manifolds have emerged as the preferred design of many of the top tuners and even OEMs. To list some of the advantages of the twin-scroll (or two-pulse) verses the Single-scroll (or constant pressure) turbo systems: Superior scavenging effect Better pressure distribution in the exhaust ports and more efficient delivery of exhaust gas energy to the turbocharger's turbine Allows for greater valve overlap Increased turbine efficiency The engineers in BorgWarner's Advanced Aftermarket Product group created a wish list of every notable design characteristic when designing the EFR (Engineered For Racing) Series. They used materials that had never been combined into an aftermarket turbocharger. They delivered quick boost response, powerful performance and reliable durability. The EFR 6258-G has an Aspect Ratio (A/R) of 0.8 and a low inertia 58mm Gamma-Ti (Titanium Aluminide) turbine wheel weighing 50% less than typical units. The turbine wheel is optimally matched with the FMW compressor wheel for maximum response and fast spool up. So effectively we have a twin scroll manifold matched to our twin scroll turbo, designed for flow and pulse tuning. For the Esprit the firing sequence is 1-3-4-2 and the conventional single-turbo arrangement has all exhaust manifolds connected together at the exhaust turbine. The twin-scroll turbo splits into two separate paths and exhaust flows hit the turbine blades independently. This prevents the two exhaust streams to interfere with each other. I found many Video references on YouTube for Twin Scroll Turbocharging but this one seemed to explain the principle. This is the resulting design shown on a 910-series engine block. The manifold is made from 321 Stainless Steel, precision TIG welded in a dedicated jig giving a fracture proof construction. The flanges are now CNC machined cut out of Stainless Steel to give an accurate fit, the collector uses a burns double wall slip joint to allow movement during the heat cycle whilst and maintaining a seal to provide maximum pressure to the turbo. The system is also being protected against shock loading by the pivoting brace mounted at the back of the cam carriers.This particular manifold has a further upgrade in terms of its T4 flange and larger collector Other modifications include Bosh Coil On Plug ignition system 4 x 750cc Fivo Injectors sequentially fired – removed secondary injectors Cam sensor using housing of old Charge Cooler water pump (Flux Capacitor) Emerald K6 ECU Electric Charge Cooler water pump Upgraded Alunox radiator set – main rad,charge cooler, oil coolers, condenser. Alunox 3” twin exit rear system I was introduced to Emerald by a friend who knows Karl the designer of the K6 ECU, so I supplied information about the flywheel pattern from the Lotus manuals and oscilloscope traces. Karl then added an option in the software for the Esprit. This allowed me to re use the existing crank sensor. The car has been tuned at Emerald by John Lamsley and I have made a few trips over the years at various stages of modification to the Esprit. It quickly became apparent he was on top of his game and has a lot of experience as he could quickly diagnose problems and provide solutions. Karl was also available for technical support when needed. My first trip was in 2015 was after installing the K6 myself and base mapping it to run a bit rich with retarded timing. It was a long journey to Watton in Norfolk from Wrexham at 50 MPH. It was enough to get there which we then spent a day on the dyno going through all the base mapping and boost tuning. My clutch started to slip so the full potential of the standard T3 with the Alunox manifold wasn’t realised, the following results where obtained. System 286 BHP / 291 lb/ft Torque Since the clutch started to let go we had to leave it there but after speaking with John, more could have been gained with this setup. It would be interesting to compare results if anyone has dyno data on the T3. So returning to the Dyno with an uprated clutch (after discussions with Dave Changes) and the new EFR setup, the car had to be completely re-mapped due to the dramatic change. Initially we tuned without any boost from the turbo to get the base map set up, the car made 170 BHP with no boost which was about 30 BHP greater than the previous setup, which was mainly gained due to the larger collector ports of the T4 flange giving an overall increase in flow. Dyno Run Video at Emerald in Watton Torque and Power Figures on new BorgWarner EFR 6258-G T4 Turbo The graph show the figures for two maps overlaid, look at the orange line showing Torque, at 2000 rpm it is double. I was held back again this time the wastegate actuator failed to hold pressure at high RPM. But some impressive figures where achieved early on 270 BHP was made on only 6 PSI boost. Also the Boost response is instant with this setup completely transforming the driving experience of the car. This was my last dyno visit for now which yielded 340 BHP @ 1.2 bar, the graph was taken just before got that figure. The Turbo is capable of 1.7 bar but due to the fact the car is running stock internals, and after further discussions and the sharing of data with Dave (Changes) on the limits of this I have held off turning it up for now. Dave must have the most first-hand dyno data on an Esprit that I know of, and so after exchanging graphs and knowledge gained over the years through experience, research and development, these two additional modifications were made for this dyno run Turbo Smart dual port actuator and MAC 4 port wastegate solenoid The new actuator set up consists of a TurboSmart IWG75 Twin Port unit allows pressure to be applied to both sides of the diaphragm so it can be held shut as well as open. The MAC4 solenoid control takes the PWM signal from the ECU and translates it into a differential pressure control across the diaphragm. PNM Plenum spacer 25mm The Plenum spacer has helped at higher RPM allowing for a steady rise in Power /Torque, which is also noticeably smoother when you are driving over the 4.5K RPM. The gains at Castle Combe Lotus Track day where noticeable this year with the instant throttle response with greatly reduced lag coupled with the new speed/Torque characteristic of the engine. This uplifted the track experience, the extra torque and where it was delivered made it possible to maintain 3rd gear as appose to 2nd in many corners. Further development I’m at the point now where I could just turn up the boost but again benefiting from Dave’s R&D I want to look at the valve timing with Vernier pulley wheels and some fine tuning of the intake system, so I can optimise the speed torque characteristic of this 2.2L lump. Mark k
  7. Hi Guys , I can ask the question ,all can say is the bigger the numbers the more we can bring down the price. Mark K
  8. I have now fitted the plenum expansion plate, the install is easy as there is good access.I’ve ran the car hard at Castle Combe at the weekend and noticed it feels like it has more torque at high RPM and delivers it is smoother, which would be due to the better flow distribution across all four cylinders The spacer is made from aluminium and has been machined to follow the contours of the plenum. The bolt holes have small counter sinks for easy location when fitting. The top section is angled to allow better flow into the plenum. The kit includes stainless steel hex head bolts and washers along with a pair of gaskets. The exiting support bar which bolts onto the engine mount can be retained, I offset it at the mount by using an addition nut. Overall it was an easy mod with a 13mm spanner. The Plenum is now available to Pre-Order here on PNM's website: It's available as a kit or just the plate, priced at £169.95 + VAT for the plate and an additional £29.95 for the gaskets and bolts (kit) plus delivery. PNM have agreed to give a 15% discount to this group buy which will apply to the plate and kit, I will PM the discount code to the you guys on the list which is valid until the 10th June. The discount is open to another 5 if anyone else is interested. Delivery charges are calculated on the website including shipping overseas. Mark K
  9. Just an update, I will firm up prices and contact info soon. The first is here which I will fit this week The kit includes two gaskets and stainless steel extended bolts The top section is angled to improve flow into the plenum. Mark
  10. Hi Andy, I asked the same question when I upgraded the charge cooler to approximately 3 times the volume. I was told its so small you dont notice it , and after driving with the bigger Charge Cooler I didn't notice any increase in lag. This is only 25mm deep , I've seen on other forums bigger spacers. I hope to have an updater from PNM this week. Mark
  11. Hi Chillidoggy , I have a dyno result before and I plan to Dyno again after I fit it. It may be difficult to interpret the results due to my other modifications. I believe it increases VE at higher RPMs. My tuner at Emerald is very good at explaining the Dyno results I will ask him. Dave Changes will have the a lot of dyno info on this. Mark K
  12. Hi guys, I’m in the process of ordering a 25mm plenum expansion spacer from PNM engineering, Pete is having these made. It will come as a kit including gaskets and extended bolts. I can’t give an exact price at the moment, but it will be around the £150 + gaskets and bolts, possibly less if we have the numbers. If anybody would be interested in this modification could you add your name to the List. 1) Mark K
  13. Hi Pan, I believe you have managed to speak with Leon about alignment, I've sent sent some info as well. Mark
  14. Hi Pan, I take it the V band flange is for the connection of the rear system to the turbo, Leon can help you with that , you will have to send him the dimensions. The difference in the pipe layout is only changed for production , they are still collect in the same order , just 2 overlaps 3 or 3 overlaps 2. Hi Franco, for our needs I think the internal wastegate is fine. I know the external units can have better flow ,but they are very expensive and are really used on professional race cars. I know the S3 Esprits use one ,Alunox developed that set-up so it was a direct replacement. After dynoing my car I found I needed the Stiffer spring in the wastegate, as the flow characteristics of the Alunox manifold blew the wastegate open. The medium spring couldn't hold it. If you were going for very high power say around 500BHP then maybe go for the external. Mark
  15. Hi looks like we have similar ideas, a T4 turbo flange is available from Alunox and comes with the larger collector I will post the final dyno results when I finish. I'm running the BorgWarner EFR6258-G Twin Scroll Turbo supplied by Van Der Lee Turbo Systems.
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