WhiteSea 0 Posted September 21, 2008 Report Share Posted September 21, 2008 I am thinking about replacing the injectors with RC Engineering ones on my V8 due to warm start problems. Can anyone advise on the correct RC injector to use ? Would it be the SL4-270, with the following spec Type Saturated Flow Rate 270cc / MIN @ 43.5 PSI 26 LBS / HR @ 43.5.PSI Resist 12.5 Ohms @ 68 F Voltage 8 - 15 Volts, nominal 13.5 Volts Amps 1.0 Amps Pressure Min 30 PSIG / Max 100 PSIG Would the replacements for the primary injectors be the PL2-370, with the following spec Type Peak & Hold Flow Rate 370cc / MIN @ 43.5 PSI 35 LBS / HR @ 43.5.PSI Resist 2.5 Ohms @ 68 F Voltage 8 - 15 Volts, nominal 13.5 Volts Amps Peak 4.0 Amps / Hold 1.5 Amps Pressure Min 30 PSIG / Max 100 PSIG Car is a 2000 V8-GT fitted with Marcus' RED Race ECU, reflowed turbos, with Larini CATS / Exhaust. Any help would be appreciated. Quote Link to post Share on other sites
peter_england99 6 Posted September 21, 2008 Report Share Posted September 21, 2008 Craig, Mike Sekinger gave me the following part number SL2-0240 when he was sourcing some RC injectors. Please let us know how you get on. Regards, Peter. Quote Link to post Share on other sites
WhiteSea 0 Posted September 21, 2008 Author Report Share Posted September 21, 2008 I found some pics of the secondary injectors here => http://www.wcengineering.com/esprit/fuelinj.html Clicking on the pic enlarges it and from there you can pick up the part no. D3764BA. A quick google on this takes you to a BMW M5 forum where it is confirmed this is the SL4-270. Maybe someone can comment if injectors with a 270cc flow rate are ok, or if 240cc should be used ???? Quote Link to post Share on other sites
andydclements 749 Posted September 21, 2008 Report Share Posted September 21, 2008 Since WC are advertising these for the 4 pot, does that mean that the same injectors are used on the 8s as well? Quote Link to post Share on other sites
WhiteSea 0 Posted September 21, 2008 Author Report Share Posted September 21, 2008 That is what I am not sure about. Marcus is selling RC Injectors for both 4 cyl and V8 here http://www.pukesprit.de/products/injectors/index.htm but there is no mention of flow rates or if there is any difference between them. Quote Link to post Share on other sites
andydclements 749 Posted September 21, 2008 Report Share Posted September 21, 2008 I've not got involved in the V8 engine, but does it have secondar injectors? if so then it would appear there is only one item listed. Given the fact Marcus lists 2 items for the primary ones, the set of 4 for the 4 pot and set of 8 for the V8, I would guess there is a difference for those, so would recommend buying them from Marcus. At least you know it's good service. Quote Link to post Share on other sites
97-Esprit V8 0 Posted September 22, 2008 Report Share Posted September 22, 2008 Those are not the correct secondary injectors for a V8 Quote Link to post Share on other sites
t70 16 Posted September 22, 2008 Report Share Posted September 22, 2008 The flow rates have to be the same as the stockers... otherwise you'll have to remap the ecu to compensate for the injector flow changes. Quote Modifying esprit's.. now that's fun..PS... I AM NOT A CERTIFIED MECHANIC.. I Have chosen to help those in need, in the past and must not be construed as being a certified technician. Link to post Share on other sites
peter_england99 6 Posted September 22, 2008 Report Share Posted September 22, 2008 (edited) If I remember correctly the RC SL2-0240 injectors provide slightly more fuel at max (6%) than the standard injectors. Fortunately, the ECU is intelligent enough to adjust the duty cycle (as it does all the time to get the correct air fuel mix) by adjusting the short & long term trim %. Craig, Please note that the RC flow rates above are based on 43.5 psi where the V8 Esprit runs 50psi. Hence the smaller 240 injector rather than the 270 one. Regards, Peter. Edited September 22, 2008 by peter_england99 Quote Link to post Share on other sites
mike_sekinger 690 Posted September 22, 2008 Report Share Posted September 22, 2008 Yep - thats right Peter. The correct upgraded primaries would be the SL2-240s. I do not know of suitable upgrade secondaries for the V8. Cheers, Mike S Quote 1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear) 1999 S350 #002 Esprit GT1 replica Link to post Share on other sites
WhiteSea 0 Posted September 22, 2008 Author Report Share Posted September 22, 2008 (edited) Mike, Glad you chipped in as I was under the impression that the primaries were of the Peak & Hold type. Found SL2-240s here http://jdmultimate.com/rcengineering/rceng...0/i-150533.aspx for $70.88 each or $ 567.04 for 8 which is about Edited September 22, 2008 by WhiteSea Quote Link to post Share on other sites
Vulcan Grey 251 Posted September 23, 2008 Report Share Posted September 23, 2008 Personally I would buy Bosch injectors over RC... for price alone. I know of someone who replaced their V8 injectors for about 1/2 the cost of RC with BOSCH from http://www.fiveomotorsport.com Call the owner Bruce Ask him about 8 primary injectors, high impedance 240cc/min (23lb/hr) top feed square plug BOSCH injectors. and 2 secondary injectors that are low impedance 550cc/min (52lb/hr) side feed (or galley fed) injectors with the square plug. I'm sure he can recommend something. I've replaced all of my 4Cyl Esprit SE injectors with BOSCH from FiveO I found some pics of the secondary injectors here => http://www.wcengineering.com/esprit/fuelinj.html Clicking on the pic enlarges it and from there you can pick up the part no. D3764BA. A quick google on this takes you to a BMW M5 forum where it is confirmed this is the SL4-270. Maybe someone can comment if injectors with a 270cc flow rate are ok, or if 240cc should be used ???? Those are the secondary injectors for the Esprit SE-S4s and GT3. Crap, I've lost the ability to edit my post. Correction: The V8 Secondaries do not have square connectors. They should look like this. Quote Travis Vulcan Grey 89SE My Lotus Photo and Projects Album Link to post Share on other sites
Günter 28 Posted September 23, 2008 Report Share Posted September 23, 2008 just as an note: my opinion is also that an 'bigger' injector can always be activated less, to compensate the air/fuel mix and the long term/short term trim. In the other way round you get more problems - as it totally clear that an small sized injector needs more time do do what he is intent for (in case you want more fuel ...) . PS. some of you know I'm still in the project to update my 'special fuel' system, or more exactly to replace the standard injectors and the additional blackbox wiring with more suitable injectors. Bud haven't bought them jet. Craig-All in all, i would say slightly bigger injectors can do it ! as long as mounting face, the connector and the Ohm-type is right. Have you searched Opel Calibra injectors ??, as they have the right types but with more flow rate... Quote ********************************************************************* to name the things if I see them, that's what I call integrity.. ********************************************************************* Link to post Share on other sites
WhiteSea 0 Posted September 23, 2008 Author Report Share Posted September 23, 2008 Thanks, I will check with Bruce @ Five-O to see what he comes up with. If the price is 1/2 that of the RC's then I'll probably go for it. Quote Link to post Share on other sites
Vulcan Grey 251 Posted September 23, 2008 Report Share Posted September 23, 2008 The BOSCH are fine injectors. Even RC Engineering, who prefer Lucas, will attest that the BOSCH are very good reliable injectors. read this http://suprasonic.org/public_html/sonictec...ors/RCtech.html Let him know it is for a Lotus Esprit V8. If you are planning mods, some of the 4 cyl guys like to increase secondary injector size, rather than primaries, so the low speed drive ability isn't ruined, but the system will be able to deliver more fuel under high rpm, high boost, high throttle conditions. Not sure if the V8 ECU options deliver the same... Marcus would though. Quote Travis Vulcan Grey 89SE My Lotus Photo and Projects Album Link to post Share on other sites
WhiteSea 0 Posted September 23, 2008 Author Report Share Posted September 23, 2008 I've added enough mods. This will be the last thing I do, except to upgrade the brakes and perhaps change the flywheel to get rid of the terrible clutch judder. Quote Link to post Share on other sites
WhiteSea 0 Posted September 26, 2008 Author Report Share Posted September 26, 2008 For anyone that is interested I have ordered the following injectors from Five-O-Motorsport. http://www.fiveomotorsport.com/Injector_SetsMODS.asp#bosch19 They are the C302 Ford Racing injectors which have a flow rate of 220cc @ 43.5 PSI, which once in the Esprit V8 will run at 235cc @ 50 PSI. Total cost was $ 329.50 for a set of 8 and $ 45 shipping to the UK. Total cost in GBP was Quote Link to post Share on other sites
kyliesmith.com 3 Posted September 26, 2008 Report Share Posted September 26, 2008 Great stuff, can you post up a how to guide with pics along the way? Quote No.23 Link to post Share on other sites
swindon_alan 1,693 Posted March 21, 2016 Report Share Posted March 21, 2016 Had a dig around these injectors, I'm thinking that I might replace mine with better ones at some point, @Barrykearley now I know I have a gearbox that can take it it is time to plan some more oomph... From the above it looks as though the Bosch injectors are fine, don't need to splash out for RC Engineering ones. FiveO Motorsports in the US still do the Bosch ones: http://www.fiveomotorsport.com/oem-fuel-injectors-0280156013 Fuel Injector: Bosch OEM UPGRADE 24 LBS Grey Knight 0280156211 CORVETTE CAMARO TRANS AM 5.7; Lotus 3.5 V-8; Porsche 911 3.6 Ah, Porker 911 too! A bit of a Google and wahey! They are also used on... MGZT / ROVER 75 1.8 16v & 1.8 16v TURBO PETROL FUEL INJECTOR (BOSCH 0280156211) http://www.ebay.co.uk/itm/MGZT-ROVER-75-1-8-16v-1-8-16v-TURBO-PETROL-FUEL-INJECTOR-BOSCH-0280156211-/271036281514 (ended) Here's a set for $369 in the US, should be easy to source them in the UK. http://www.ebay.com/itm/Set-of-8-BRAND-NEW-Bosch-Fuel-Injectors-0280156211-1997-2005-GM-5-7L-VIN-G-S-/201469612612 1 Quote I tempted fate...now my Esprit V8 IS in bits...(sob) Link to post Share on other sites
superdavelotus 124 Posted March 21, 2016 Report Share Posted March 21, 2016 How can you test your old injectors to see if they are working? Quote Link to post Share on other sites
swindon_alan 1,693 Posted March 21, 2016 Report Share Posted March 21, 2016 28 minutes ago, superdavelotus said: How can you test your old injectors to see if they are working? Google is your friend Dave http://www.doityourself.com/stry/how-to-test-a-fuel-injector Plus the ECM monitors the injectors, if there is a fault with one of them you should get a problem code. Quote I tempted fate...now my Esprit V8 IS in bits...(sob) Link to post Share on other sites
superdavelotus 124 Posted March 21, 2016 Report Share Posted March 21, 2016 Hi Alan, I've seen videos like this before but it doesn't cater for when you have a huge plenum in the way! How can you run the engine when you've taken the plenum off? David Quote Link to post Share on other sites
swindon_alan 1,693 Posted March 21, 2016 Report Share Posted March 21, 2016 1 hour ago, swindon_alan said: Plus the ECM monitors the injectors, if there is a fault with one of them you should get a problem code. Indeed! Duh! More to the point is the above. You could still take them out and measure the resistance though? Quote I tempted fate...now my Esprit V8 IS in bits...(sob) Link to post Share on other sites
sailorbob 263 Posted March 21, 2016 Report Share Posted March 21, 2016 I am not sure using the Bosch 0 280 156 211 injectors are a good idea on a stock ecu. They have about 18% more flow so you could easily start hitting the rich error limit and get error codes P0172 and P0175 as the long term fuel trim margin is vastly reduced. Also, they are 14.5 ohms and the stock are 12 ohms. Quote Link to post Share on other sites
superdavelotus 124 Posted March 21, 2016 Report Share Posted March 21, 2016 Hi Alan, I have no fault codes but suspect jammed injector/s or wiring to them or ECU or primary fuel pump. Primary and secondary pumps prime OK, just don't know what pressures they pump out without the right tools. Jammed injectors don't always give you an ECL. David Quote Link to post Share on other sites
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