S1 111s Rev Limiter?

[Matt C]

Just been out for a quick drive to see what my tweaks are like (mainly Nitron damping change), and made a mental note of where the rev limiter came in. 5800rpm - seems and felt low. Hit it in 2nd 3rd and 4th (found an empty available airfield to test this of course). I thought the limiter was up at 7000rpm. Runs fine etc so no problems, just don't know if the VVC requires a lower limit than others.

Anyone know??

[paulb]

From memory I think mine cuts in at 7300. (111s)

 

And S1’s without VVC cut in at 6900.

[Matt C]

Oh.

[Neil_C]

I've got 7200 stuck in my head for some reason. According to elises.co.uk it's max power is 143 at 6750rpm so somethings not right. On some engines revs are limited if low oil or coolant, a cheap start to check?

[paulb]

Matt.

 

Found this on you tube, may not be the problem you have but worth a look.

 

[Matt C]

I've got 7200 stuck in my head for some reason. According to elises.co.uk it's max power is 143 at 6750rpm so somethings not right. On some engines revs are limited if low oil or coolant, a cheap start to check?

 

Oil level is spot on, and temp is fully warmed up (plus have drive for 10-15miles).

I have a few temp sensors so might try swapping them over. Can never remember which sensor is the the stack (which is ok) and which is for the ECU. (Goes to look at notes).

If its the cam position sensor, then they are pricey.

I'm 99% sure it'll be a sensor, as the engine runs fine, but feels like its just about to get going when the limiter comes in.

 

Matt.

 

Found this on you tube, may not be the problem you have but worth a look.

 

 

Thanks Paul (odd thing to puty on youtube!) Will go and check for that. Seems the same issue!

[Ladders]

Yes, sure mines 7200 as well Matt

 

What damper settings you going for then? For road?

[lummo]

I've got 7200 stuck in my head for some reason. According to elises.co.uk it's max power is 143 at 6750rpm so somethings not right. On some engines revs are limited if low oil or coolant, a cheap start to check?

 

Yep, 7200rpm for the S1 111s.

 

I asked this question a couple of weeks ago, and it was Martin that told me this (he'd read it somewhere, apparently ), so it looks like there's some sort of problem .

 

No problem with mine (that I know of), just curious where it was as I'd never hit it.

[Matt C]

Yes, sure mines 7200 as well Matt

 

What damper settings you going for then? For road?

 

2 harder than Martins setting! Not sure how many clicks that is - maybe Martin knows.

Just read on the dark side that it could be a faulty VVC mechanism and it isn't moving. Don't know how to tell if it is moving or not really, not having known any different.

Bugger. Bedford might have to be cancelled.

[mambosasa]

Bugger. Bedford might have to be cancelled.

 

You should be busy trying to get some sleep by then anyway

[Matt C]

You should be busy trying to get some sleep by then anyway

Mmmm... was at hosp for a few hrs lastnight... still not arrived yet!

[Matt C]

Back from hosp now, so time to do a bit more investigative work! (Danger of moving this to technical from general).

 

Idle is 750rpm when warm. When disconnecting the cam position sensor this increses to 1000rpm, so thats working ok. VVC mechanism sounds like a diesel until its warmed up (5mins idling) then it fades out to a normal noisy K Series rattle(!).

 

Anyone confirm if the ECU looks for water or oil temp which would limit the temp if sensor is faulty?

[JonS]

Automated moderation message:

 

Topic moved to the technical section

[Guest Glen]

I can confirm that the ECU limits the revs if it finds anything out side of normal operating parameters.

 

The good news is that it's probably just a faulty sensor that can be found with the appropriate OBD tool. I doubt it's the VVC mechanism itself if you didn't notice until the rev limit kicked in as the timing is varied all the way through the range with the rover VVC. If the VVC wasn't working you should have noticed a loss of torque lower down the rev range.

 

Tha bad new is that mine has been like this since I bought it over a year ago . I've tried sawpping numerous sensors (both coolant temp, cam angle + air intake temp) and had three different garages look at it so far to no avail. Two of the garages were elise specialists who tried things and then said that they had no idea, although they did say the VVC mechs were OK and lined up on there timing marks. The other had a diagnostic tool that was capable of reading and resetting the fault codes (note that the ECU isn't OBD2 compliant). Faults were logged for all of the sensors I'd changed (probably cause by me changing them). They were able to reset all of the faults apart from the air intake temp which showed an air temp of minus 40C when the engine was running. I've since changed the air intake temp sensor a second time for another brand new one which didn't fix the limit, and checked the wires from the sensor to the ECU and all is OK there. So I'm beggining to think it's the ECU itself.

 

I hope you're luckier than myself and if you search in SELOC you'll find numerous instances of people with the same problem that have fixed it simply by changing a sensor.

 

I'll hopefully see you at Bedford as I should be there anyway (MOT retest permitting).

[Matt C]

Hi Glen,

Will certainly be interested to chat to you at Bedford.

Have you checked the VVC solenoid are actuating? I'm thinking about this, but both connectors have 12v at them so I'm stuck before I started.

There are 2 brown temp sensors on the engine. One for water, and one for the oil temp at the VVC. I'm contemplating swapping these over with each other to see what the effect is.

Its a bugger as ever time I need to test it, I have to warm it up and take it out for a drive.

I've not driven a VVC engine before, so not familiar with what the torque 'surge' feels like.