Pro's and Con's

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samueljon
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Pro's and Con's

Post by samueljon » 11 Oct 2010 08:45 am

Sorry about all the questions just trying to learn the car :)

right what are the pros and cons of running the webbers on the F7R engine?
also what sort of price am i looking at?
and what happens to the fueling side of the ecu?
and would this stop the high idle after a hard drive? (i know this is the speed sensor)

Cheers
Sam

Again sorry about all the questions

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Chris_C
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Re: Pro's and Con's

Post by Chris_C » 11 Oct 2010 08:54 am

samueljon wrote:and would this stop the high idle after a hard drive? (i know this is the speed sensor)
Erm... what? An F7R shouldn't idle high ever (well, it'll idle at 1100 on a cold start and if you *really* go for it will idle at 1100 for about 30 secs to keep the water pump going but I wouldnt consider from 950 to 1100 high. No worse than carbs will be at least.

Webers - £200, Manifold - £100 if you are lucky, Mappable spark system - £not sure, but not cheap, Tuning - £half a day on a rolling road.

My views on running F7R's on carbs are fairly well known on here, so I might not be too helpful though
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

samueljon
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Re: Pro's and Con's

Post by samueljon » 11 Oct 2010 09:57 am

after a hard drive the car runs at 2000rpm and doesnt settle down unless the car is switched of and started again.

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Chris_C
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Re: Pro's and Con's

Post by Chris_C » 11 Oct 2010 11:23 am

Ok, someone has fiddled with the idle side of it.

Does the ICV go to the same air intake as the main throttle body? There seems to be a necessity of a small pressure differential there so if the ICV is on a separate filter it plays up a bit (my MOT chap mentioned it to me, and it cured a few problems I was having) Once you've done that, the air bleed bypass jobbie on the throttle body is mission critical, there a sweet spot of about 1/8th of a turn between silly high random idles and stalling at junctions.
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

samueljon
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Re: Pro's and Con's

Post by samueljon » 11 Oct 2010 11:36 am

so its not a speed sensor issue? as it only does this after traveling above 60ish i think

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Speedy88
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Re: Pro's and Con's

Post by Speedy88 » 11 Oct 2010 01:03 pm

Hold on now, I was always aware that without a speed sensor an F7R would idle high after driving hard. Otherwise what's the point of even having it? I once knocked the cable to mine out and I got these exact symptoms.

Also mag's one did this for a while if I'm not wrong because he didn't even have one?
'88 340 Williams (Sold)
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samueljon
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Re: Pro's and Con's

Post by samueljon » 11 Oct 2010 01:21 pm

i dont think this one has one as the bloke i bought it off couldnt find out what was causing it, i think that the issue is the speed sensor ( well the symptoms point to it )

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Chris_C
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Re: Pro's and Con's

Post by Chris_C » 11 Oct 2010 01:27 pm

Sounds like it could be either, certainly I've had the issue and that was fixed by doing what I said above, I have a speed sensor.

Might just be a case of tracking down a few different things bud, I had several problems causing my bad idling and took a while to get on top of all of them!
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

volvosneverdie
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Re: Pro's and Con's

Post by volvosneverdie » 11 Oct 2010 03:53 pm

My friends started working in a prison giving advice to convicted prostitutes.
I asked him what the job was like ......................

He said, well..... its got is Pros and Cons...

Threadjack ends.
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samueljon
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Re: Pro's and Con's

Post by samueljon » 11 Oct 2010 04:47 pm

i will look over it, but i dont think it has a speed sensor car idles fine until i go 60 or above then it wont settle back down

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340GLT
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Re: Pro's and Con's

Post by 340GLT » 11 Oct 2010 10:25 pm

That is speed sensor. Dont forget chris your car has always had the speed sensor.
Adam
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Chris_C
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Re: Pro's and Con's

Post by Chris_C » 11 Oct 2010 11:36 pm

Agreed mate, but Fake showed pretty much identical symptoms when the ICV wasnt plumbed correctly and it had a dubious MAP sensor
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

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