Discussion
Having pretty bad turbo lag with my 1995 S4 and trying to find out the best remedy. Having read up from LEW site about dump valves, this could possibly be the answer, but don't want to sound like a EVO or Scooby!! Are there any alternatives to preventing my supercar turning into a boy-racer Max Power machine?!?!
(no offense meant to any EVO or Scooby drivers out there!!)
(no offense meant to any EVO or Scooby drivers out there!!)
I like to hear my dump valve swoosh each and every time...it lets me know it is working (or has stopped working, like when the hose split.)
Also, judging by the volume and duration of the sound, I can tell how much boost I hit without looking at the gauge...kind of an aural cue to how hard I'm driving at the moment.
It will really make you aware how often you engage the turbo.
I didn't want to have the sound either...until I got one. Can't imagine driving the Esprit without one now.
Mike
Also, judging by the volume and duration of the sound, I can tell how much boost I hit without looking at the gauge...kind of an aural cue to how hard I'm driving at the moment.
It will really make you aware how often you engage the turbo.
I didn't want to have the sound either...until I got one. Can't imagine driving the Esprit without one now.
Mike
I know a source that can get the bits for you cheaply. Alternatively you can buy one through LEW (justin) for £155. This one though makes the whooshing noise.
The only problem is that you have to run a 25mm diameter pipe from the dump valve back to your air box. You will have to fabricate something to your airbox to make it work. Dermot O'hare and Owen Geddes (Race Speed) are developing an air box with this attachment.
BTW, you need a twin piston type as yours has an air meter and a single piston may cause problems.
Cheers,
Dave Walters
The only problem is that you have to run a 25mm diameter pipe from the dump valve back to your air box. You will have to fabricate something to your airbox to make it work. Dermot O'hare and Owen Geddes (Race Speed) are developing an air box with this attachment.
BTW, you need a twin piston type as yours has an air meter and a single piston may cause problems.
Cheers,
Dave Walters
wipper said:
Having pretty bad turbo lag with my 1995 S4 and trying to find out the best remedy. Having read up from LEW site about dump valves, this could possibly be the answer, but don't want to sound like a EVO or Scooby!! Are there any alternatives to preventing my supercar turning into a boy-racer Max Power machine?!?!
(no offense meant to any EVO or Scooby drivers out there!!)
Hi,
I think you might be disappointed if you install a dump valve in order just to get rid of turbo lag. Turbo lag is usually referred to as the time the turbo takes to spin-up before you start to feel boost. Obviously a dump valve doesn’t work until the turbo has been spun up and the throttle plates have been closed, and back pressure is relieved which stops the turbo spinning down as fast. I guess it helps a bit on the "re-spin-up" between gears (well, help it to not slow down so much in between anyway) but you won't feel too much difference in lag I doubt, perhaps a bit (unless you change gears really slowly).
If you really want to minimize lag you may want to consider a turbo upgrade. They have compressor wheels that offer a faster spin up time but obviously this is a costly upgrade (about $200 more than a regular turbo rebuild, which usually comes in around $450).
The dump valve is a good idea though to extend the life of the turbo and keep it working at its most effective. I fitted my valve directly to the back of the plenum. Easy fit and total cost was $50 instead of the $300 they charge for the specially made valves, works just as well.
Hope this helps,
Mark – 88 Turbo
Try www.moto-concept.de
Click on the icon at the top to turn it into english. If your turbo lag problem is something new which wasn't always there, you probably have something wrong.
Click on the icon at the top to turn it into english. If your turbo lag problem is something new which wasn't always there, you probably have something wrong.
Cheers for all the responses guys. The turbo has always behaved like this, although I'm a new boy with the Esprit - only a couple of months - and I'm no mechanic (although learning fast!). So far I've had the head gasket go, the lamba sensor failed, the heaters packed in and the car idles too high!! (the car's booked in for this one though).
Anyway, back to the issue, the turbo fills up quite slowly in comparison to many other turbo cars I've driven and then needs time to re-fill between gear changes. It's not a major problem I don't reckon, but you always wan't to get the most out of the car. I've not seen the boost go beyond 0.5 bar either! Is this normal? As I've no other Esprit to drive, I have no comparisons so have to rely on you guys!
Anyway, back to the issue, the turbo fills up quite slowly in comparison to many other turbo cars I've driven and then needs time to re-fill between gear changes. It's not a major problem I don't reckon, but you always wan't to get the most out of the car. I've not seen the boost go beyond 0.5 bar either! Is this normal? As I've no other Esprit to drive, I have no comparisons so have to rely on you guys!
Hi again, didn't reallise you live in Cheshire, Iam on Wirral, Merseyside, how far away are you?
Where are you booking it in?
As for your turbo lag problem, I had a seized wastegate when I first bought my car. Turbo wouldn't come in until about 4000RPM. PNM sorted for me insitu. Now it spools up as little as 2000RPM.
Question to the technical guys on this forum, what happens if the wastegate actuator rod slips off the wastegate. This could give these symptoms couldn't it?
As for idling problems, apart from the obviously adjustment to the idle screw you could try the throttle body. It's at the end of the cam cover towards the front bulkhead. It's a solenoid in an aluminium body. At first the bracket looks quite sturdy but you can bend it in your hands. Try bending this up slightly with the engine on and warmed up. It's very easy, don't bend too much. If the revs come down a little then you know it's that.
What model of Esprit do you have? Could have some other solutions to your turbo lag.
My e-mail address is dave@acsdesign.org.
BTW Iam trying to organise a NW meet in ealry spring so I need your details anyway if you are interested.
Cheers,
Dave Walters
Where are you booking it in?
As for your turbo lag problem, I had a seized wastegate when I first bought my car. Turbo wouldn't come in until about 4000RPM. PNM sorted for me insitu. Now it spools up as little as 2000RPM.
Question to the technical guys on this forum, what happens if the wastegate actuator rod slips off the wastegate. This could give these symptoms couldn't it?
As for idling problems, apart from the obviously adjustment to the idle screw you could try the throttle body. It's at the end of the cam cover towards the front bulkhead. It's a solenoid in an aluminium body. At first the bracket looks quite sturdy but you can bend it in your hands. Try bending this up slightly with the engine on and warmed up. It's very easy, don't bend too much. If the revs come down a little then you know it's that.
What model of Esprit do you have? Could have some other solutions to your turbo lag.
My e-mail address is dave@acsdesign.org.
BTW Iam trying to organise a NW meet in ealry spring so I need your details anyway if you are interested.
Cheers,
Dave Walters
Dave - how come you know i'm from cheshire? (live in congleton).
The car's an 1995 norfolk mustard S4 and is booked in with Christopher Neil in Northwich as it's handy for work.
I'll be interested in a spring meet. Let me know where and when. (my email - wipper2000@hotmail.com) That'll be my first event as i've only had the car a couple of months.
Gareth
The car's an 1995 norfolk mustard S4 and is booked in with Christopher Neil in Northwich as it's handy for work.
I'll be interested in a spring meet. Let me know where and when. (my email - wipper2000@hotmail.com) That'll be my first event as i've only had the car a couple of months.
Gareth
wipper said:
Dave - how come you know i'm from cheshire? (live in congleton).
The car's an 1995 norfolk mustard S4 and is booked in with Christopher Neil in Northwich as it's handy for work.
I'll be interested in a spring meet. Let me know where and when. (my email - wipper2000@hotmail.com) That'll be my first event as i've only had the car a couple of months.
Gareth
You're only 45 minutes away so not too bad. I will store your details, cheers,
Dave Walters
Hi Wipper,
If it is idling high and you are not getting full boost then I would suspect the thermostat jamming open. The ECU will not allow full boost until the engine is above a certain temperature (75C on the GT3). I had this exact problem on my GT3 quickly diagnosed with an ALDL lead, laptop, and a freescan log. You could also check by letting it idle stationary for a while until the temperature rises to about mid gauge and then trying it. If it gives full boost for a while until your temperature drops then that is your problem. good luck!
Phil
If it is idling high and you are not getting full boost then I would suspect the thermostat jamming open. The ECU will not allow full boost until the engine is above a certain temperature (75C on the GT3). I had this exact problem on my GT3 quickly diagnosed with an ALDL lead, laptop, and a freescan log. You could also check by letting it idle stationary for a while until the temperature rises to about mid gauge and then trying it. If it gives full boost for a while until your temperature drops then that is your problem. good luck!
Phil
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