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Dave Hopwood

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Posts posted by Dave Hopwood

  1. Paul at those revs I don't even think the secondary pump has kicked in

     

    It could be the primary pump or the fuel pressure regulator

     

    I have a gauge you can fit on the Schrader valve and drive around doing various tests whilst looking at the pressure

     

    If you want to borrow it you are welcome

     

    BTW I replaced my pumps with the Walbro 370

     

    When I removed the originals the motor carbon brushes on the primary were shot

     

    Regards

     

    Dave

  2. Hi Paul

     

    I did the same as you and tightened the bolts evenly

     

    I have a theory as to why a new clutch judders , might be wrong but here goes

     

    My old clutch had a weak clamp spring so I reckon the weakness acted as a form of damping upon take up

     

    When you fit a complete new clutch the clamp spring has more tension and may act more aggressively upon take up hence judder , and bearing in mind it is still un damped clutch

     

     

    Regards

     

    Dave

  3. There is a "stock" fault with the post 98 V8 gauge , it develops a huge dry joint on the metal pot that is soldered over the coil assembly . You would have to cut the back off and then after repairing glue it back on , I prefer to cut with a hot knife

     

    Regards

     

    Dave

  4. Only the base electronics are GM , the software is all Lotus designed specifically for the Esprit V8 . When you consider the two cars the corvette was normally aspirated where as the Esprit is turbocharged

    I think Johan and a few others have interrogated the mapping and would be better placed to answer your question

    All boost calibration is held in two eeproms ic19 and ic20 in the ECU , if you socket these two devices you will have a range of plug in options to go for

     

    Regards 

  5. Hi Brian

     

    I considered replacing the stock ECU a few years ago .

     

    The area needing the most thought is the interface with the ABS controller , the standard fit Cobra alarm would need a bit of re thinking as well

     

    Generally , the Esprit V8 ECU is not a bad unit , it is after all a modified Corvette GM one

     

    I think Red race chips combined with high flow cats and K&N or Green air filters is still the best way to go

     

    Regards

     

    Dave

  6. It always seems to be the intermediate shaft pulley bolt that works loose (when I took the engine out the bolt could be removed with finger pressure only)

    When you consider the loads on the various pulley's it's the intermediate that is under the most stress as it has to drive 4 cams 32 valves at once , at least each camshaft only has to deal with it's own 8 valves a quarter of the intermediates load , and torqued up correctly there is the chance the cams can probably cope 

    The shaft in now keyed as even doing the job myself I am the best part of £2500 out of pocket .

     

    Dave

  7. Hi Gunter

    My engine is fitted with stock head bolts

    Anyway,the the engine is now out of the car now as I wanted to key the intermediate shaft pulley as I don't trust torque tightening and it's happened to too many owners that the bolt has worked loose trashing the engine(now including mine)

  8. Paul

     

    There are two one way valves on the V8 one at the front of the engine bay and one at the back near the throttle linkage

     

    If you remove them you should only be able to blow through them one way if intact

     

    Mine were both shot allowing boost to be vented and excess air to be consumed

     

    They are something to do with the breather system,oil mist over a period of time tends to make them stick open

     

    Regards

     

    Dave

  9. I've just re-built mine without any problems using the Helix friction disks,they are a direct replacement for the AP V8

    They are available from ebay although the cheapest source is Mardi Gras Motorsport

    Ps For the sake of 70p don't re-use the star clips.My last re-builder did and that was the problem,one had broke allowing the pack to slid at an angle causing clutch slip

    Regards

    Dave

  10. Hi John,

    I too have a 98 fitted with Saturns.For the last five years or so I have been running on Falkens and have been very pleased with them.I chose these because I use the car for work and wanted a tyre with good grip and a reasonable life expectancy

    Plus you don't have to re mortgage the house to buy a set around £500 to kit out a V8

    Regards

    Dave

  11. If the car is running okay then in theory the cam timing is in tolerance,this is verified by the fitting of the smaller setting pins,normal belt change should not involve moving the cam belt pulleys,you could get into a real mess here as there are no key ways

    Other important things to check are the intermediate shaft bearing and the belt back idlers.

    The thing to bare in mind is does your car need any other work ie manifold studs/turbo recon/clutch/water oil hoses ect as I found it easier to "stock pile" all the jobs and pull out the engine and do the lot

    Regards

    Dave

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