Oaksey's Ti

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Re: Oaksey's Ti

Post by CNHSS1 » Mon Aug 01, 2016 7:26 pm

Ecu has two pump drives. 1st 'primes' for 5 secs when ignition on, purely a timed function.
2nd is when cranking and then when started, can only run when it senses the engines turning via the crank angle sensor hidden in the dizzy.

If the pumps running constantly it's highly likely the ecus been bypassed at some point and pumps is wired to a ign live source


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Re: Oaksey's Ti

Post by scimjim » Mon Aug 01, 2016 8:15 pm

CNHSS1 wrote:If the pumps running constantly it's highly likely the ecus been bypassed at some point and pumps is wired to a ign live source
Doesn't the ECU switch the -ve?


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Re: Oaksey's Ti

Post by CNHSS1 » Mon Aug 01, 2016 8:35 pm

Sorry should've said ign on source.
The ecu switches the negative but if the ecus control has been bypassed I wouldn't assume that's still the case Josh, have a proper check


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Re: Oaksey's Ti

Post by Oaksey » Mon Aug 01, 2016 9:29 pm

Thanks, the negative feed looks to be going from a shared earth point via an inertia switch. I've just had a look at the Nissan manual and wiring diagrams to learn how everything goes and would I be right in thinking the 12V live is constant and the ECU varies the negative signal for priming etc? In which case, it'll be easy to reinstate the original setup.


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Re: Oaksey's Ti

Post by scimjim » Mon Aug 01, 2016 10:05 pm

Yes - but it's probably been bypassed because the pump circuit in the ECU is toast - nothing wrong with bypassing it IMHO as long as it goes through an inertia switch.


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Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
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1300 SS1 (Number One) & Sarah's coupe.
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Re: Oaksey's Ti

Post by Oaksey » Mon Aug 01, 2016 10:11 pm

Agreed, nothing really wrong with it but it annoys me when things like that aren't right. We've got spare ECUs so it's just finding the original wire or most likely, running a new one if it was chopped off


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Re: Oaksey's Ti

Post by Oaksey » Sat Aug 13, 2016 8:35 pm

Not a great deal of progress really but it's getting there.

I sorted a few electrical issues so the interior lights, clock, radio etc all work and I fitted a new radio.
I've changed the ball joints and TREs as all the boots were perished and I know they haven't been changed in at least 4 years. The bottom ball joints were pretty seized in the wishbones but they gave way eventually. I went out this afternoon to check it and I completely cooked the brakes within 3 miles - I found out when there was a combine harvester coming the other way down the narrow B road and the pedal just sank to the floor. So it looks like I'll be needing a pair of vented discs and calipers to suit and I'll just have to stomach the hefty insurance increase.
I also took the exhaust manifold heat shield off to try and find the exhaust leak but it's proving tricky to locate. The condition of the studs and gaskets don't look great so I can see it turning into a weekend engine out job at some point to make it all better.


Josh Oakes
2015, 2016 and 2017 SSSC Champion
1974 Yellow Se5a Overdrive
1971 Blue Jaguar XJ6
1966 Blue Coupe Straight Six
Previous- Coupe S6,
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Re: Oaksey's Ti

Post by Oaksey » Sun Sep 11, 2016 6:26 pm

My suspicions that E90 wasn't quite running 100% correctly were confirmed after Geoff Pinch offered me a go in his standard Ti. It was miles quicker than E90 and had much better response.
Fast forward to today when I had a proper look. It's not brilliant news tbh. The centre housing is moving inside the exhaust housing.


The roll bar has finally been fitted after being with the car for 4 years and two previous owners :lol: it's a very good match with the seats too
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2015, 2016 and 2017 SSSC Champion
1974 Yellow Se5a Overdrive
1971 Blue Jaguar XJ6
1966 Blue Coupe Straight Six
Previous- Coupe S6,
SS1 Ti, E90 SS1 Ti, SE6a x3, SE5 Auto, SS1 CVH, Mk2 Sabre, Rebel Estate

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Re: Oaksey's Ti

Post by Oaksey » Wed Sep 21, 2016 8:10 pm

The next step with the turbo diagnosis was to see how well it was actually producing.

I bought a cheap boost gauge off eBay and did a few test runs. I wasn't sure on the accuracy of the gauge so I took the one from In DEbT and the results were the same. It's only producing 3.5psi of boost which definitely explains why I thought it was slow.
I then put a ball and spring bleed valve in and raised it up to 7.5psi and it pulls much better with the boost coming in a lot sharper. I think the wastegate actuator spring is weak and it was fluttering a bit.

I've since bought another turbo and when it arrives it'll go off for a rebuild. Then it'll be a quick engine out job as I'm also going to change the exhaust manifold, cam belt, water pump etc and clean the engine and bay


Josh Oakes
2015, 2016 and 2017 SSSC Champion
1974 Yellow Se5a Overdrive
1971 Blue Jaguar XJ6
1966 Blue Coupe Straight Six
Previous- Coupe S6,
SS1 Ti, E90 SS1 Ti, SE6a x3, SE5 Auto, SS1 CVH, Mk2 Sabre, Rebel Estate

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Re: Oaksey's Non Ti

Post by Corky » Thu Sep 22, 2016 12:30 pm

I've not seen one loose in the housing like that before. Is it not rebuildable ?


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Re: Oaksey's Non Ti

Post by philhoward » Thu Sep 22, 2016 12:34 pm

I've seen a T2 where the compressor housing moved in a similar manner - IIRC the compressor housing is held in my the mother of all circlips. Is the turbine compressor housing the same, and is the circlip still present? It was on the one I saw (compressor housing movement), yet still it wobbled like a good 'un.

In that case though I think there's a large O ring involved which may, or may not, have been present. I didn't hear of the post-mortem on it.


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Re: Oaksey's Non Ti

Post by Oaksey » Thu Sep 22, 2016 2:34 pm

Corky wrote:I've not seen one loose in the housing like that before. Is it not rebuildable ?
I won't know until it's off so I'm not risking it incase the circling groove is fudged.
philhoward wrote:I've seen a T2 where the compressor housing moved in a similar manner - IIRC the compressor housing is held in my the mother of all circlips. Is the turbine compressor housing the same, and is the circlip still present? It was on the one I saw (compressor housing movement), yet still it wobbled like a good 'un.

In that case though I think there's a large O ring involved which may, or may not, have been present. I didn't hear of the post-mortem on it.
Yes, it's the same method and the circlip is still there. It stays still when you move the turbo core so the problem looks to be with the core rather than the exhaust housing


Josh Oakes
2015, 2016 and 2017 SSSC Champion
1974 Yellow Se5a Overdrive
1971 Blue Jaguar XJ6
1966 Blue Coupe Straight Six
Previous- Coupe S6,
SS1 Ti, E90 SS1 Ti, SE6a x3, SE5 Auto, SS1 CVH, Mk2 Sabre, Rebel Estate

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Re: Oaksey's Non Ti

Post by td99 » Thu Sep 22, 2016 3:07 pm

I had much he same problem and the turbo specialist used a few stainless steel shims to make sure it was tight. Worked fine for years.
Recently had a brand-new core and the inlet is tight, but can be rotated with leverage. (Outlet rock solid.).
Seems that the standard core is NLA and so I've now got one without water cooling - makes mounting so much simpler!. Apparently all one needs to do is make sure you let engine idle for a while (10-20 secs) before turning off. Really only something to watch out and let cool more in my view if you stop directly after some high speed driving , eg motorway services/racetrack.


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Re: Oaksey's Non Ti

Post by CNHSS1 » Thu Sep 22, 2016 3:12 pm

Turbo Technics built the turbo for Batmobile and suggested a water cooled core but not connected up so the core was open to the atmosphere. The water cooling basically warms the core for first few miles on a Raodgoing car and and as you say TD, stops oil carboning up the bearings after a hot shut off. On a racer, or even enthusiast owned scim, no water cooling isn't a issue as we don't thrash them from cold and let them idle before shut down and have top quality oil and short service oil changes so no probs :-)


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RIP Batmobile, await the Rise of Dark Knight 8)
Sabre 'Light Sabre' 360hp!!
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Re: Oaksey's Non Ti

Post by efi_sprintgte » Thu Sep 22, 2016 6:01 pm

The twin GT20s I've fitted are non water cooled. Garrett said it would be fine


JC

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