OcUK Mini Rolling Road Day 14.5 @ PowerStation (Tewksbury) - Saturday November 24th 2012

[Tute]

Come on Will, where's the fun in that? Another eight runs and you're back to stock!

Considering I almost bought a car yesterday (somebody came along at the 11th hour and offered more money) I expect i'll be attending the next one of these to see what numbers I get.

 

[Gibbo]

Is the GTR modded ?

From what JP said it had new intakes, injectors, a completely new decatted exhaust system and remap along with gear box strengthening. Having driven GTR's before and being a passenger a lot JP's extra 150BHP could easily be felt on the road even in wet conditions trying to put all that power down.

 

[Meridian]

A Dyno run is generally carried out on a gear down from top which means that speed will build up slowly, Impreza are geared for one thing. Acceleration. So its totally plausible that it should require the top part of the rev range in a high gear to hit a high speed. It's far from unsurprising. I'm sure Kosta can shed more light on it as I am a country mile away from being an Impreza gear ratio expert.

AFAIK his (Kosta's) gearbox is the same as mine. As such, max speed in each gear is roughly:

1st: 28mph
2nd: 59mph (makes 0-60 figures lower than they ought to be because you need another gear change compared to most cars)
3rd: 86mph
4th: 98mph
5th 128mph
6th: whatever the top speed of your vehicle is. In theory, with unlimited power, it's about 185 I believe.

So yes, pretty close gearing (although not as close as the Classic Type R-As which were very silly. A 0-60 run means two gear changes in under five seconds.

 

[Blackhawk47]

I do not deny this...

I am generally the only northerner in attendance.

Location: London...

You are not northern...even if you are from middlesborough...still not northern!

 

[PMKeates]

AFAIK his (Kosta's) gearbox is the same as mine. As such, max speed in each gear is roughly:

My diesel has longer legs

 

[killer_uk]

Big thanks first of all to Kosta for arranging the meet and to the guys at PowerStation who were very kind to let me keep my car at their unit over the weekend, and for taking the time to look at it at the end of the RR session. Thanks to Rich for giving me a lift home, and to Will for the advice and because his mobile actually had signal when you guys were at the pub

Not really sure what the problem is with my car at the moment, thinking back it has been slightly more noisy over the past week or so (tapping), I didn't think anything of it as the injectors on the Duratec engine are noisy anyway. The car seemed fine up until it finished on the Dyno when it sounded really rough.

The bogs down very easily and stalls, all the while there is this really loud tapping noise which increases with the revs (sounds like a tractor). Oil levels are fine (full on friday at checking). I was going to drive it to the pub after the meet but the engine warning light came on. The guys at powerstation plugged it in and it gave a code which gave a 'too rich' reading.

Looking into it last night, a broken valve spring may be the cause, which means the exhaust valve is stuck open, which would make the mixture too rich. If this is the cause (I'm open to suggestions), hopefully no further damage has occurred.

I will be calling Mountune tomorrow to discuss options, I still need to get the car to them if they want to look at it. Bare in mind the car is red lined quite often, so it would have given up at some point, it's quite lucky in one way I wasn't stuck on the side of the motorway.

As regards power, the Mountune kit is 200PS so around 197bhp. The car made 196 before correction I believe, so all in all, it's roughly right. I don't know what conditions Mountune dyno their engines at, so it's not far off.

It would be interesting to see if the failure had caused power to be down, but I won't know now. The additional torque the MR200 kit brings would mean it would be far ahead of a car with a 185 kit installed on the road or track, and for that I'm more than happy with it

 

[^JP^]

Will and Gibbo are right with the mods, I will just list the full details for anyone who is interested.

I will also update my car thread with pictures of the mods being done once I receive them.

http://severnvalleymotorsport.co.uk/

SVM 80mm intakes (allows greater MAF resolution for tuning)
SVM 1050cc injectors (stock are 570cc and max out at around 580bhp)
SVM 102mm full de-cat exhaust system (stock is very restrictive and has 4 cats)
SVM Gearbox cir-clip upgrades (means I can launch is as much as I like without the stock circlips slipping off the shafts and the gears falling off in the box!)
Cobb Access Port w/ TCM - Tuned on Shell V-Power 99RON by Ben Linney at GTC (Ben is the Jedi Master of GTR tuning)

That is pretty much as far as you can go without doing modified turbos.
If you do mod the turbos you can't raise the torque and higher anyway because the stock rods will bend.
So the next stage is built engine, turbos and more gearbox work to take the power.
That costs around 20k with only a light engine build (short block) but is good for around 850bhp.

I am pretty happy with how it is for now!

Car thread is here where I will post the pictures during the week. http://forums.overclockers.co.uk/showthread.php?t=18426986


Thanks again and looking forward to some more pictures and videos from the day!

 

[Blackhawk47]

My diesel has longer legs

My gearbox is same...but better.

 

[Fuzz]

If the oil filler cap is big enough Will I can stick a endoscope down there and have a look at what I can if you like. I don't know when you're having the car uplifted.
That's definitely where the noise is coming from, it sure isn't noisy injectors!!
If it has progressively got louder I'd say it was more likely the nose of one of the camshafts has been wiped off or one of the lifters worn. A broken spring would be more instantaneous clatter and the engine would stop in short order when the piston tries to shove the dropped valve closed!!
That was also a bit of a ****ter about the recovery you pay for only taking it 10 miles. Whats the point in paying for that **** sort of service!

 

[Will]

If the oil filler cap is big enough Will I can stick a endoscope down there and have a look at what I can if you like. I don't know when you're having the car uplifted.
That's definitely where the noise is coming from, it sure isn't noisy injectors!!
If it has progressively got louder I'd say it was more likely the nose of one of the camshafts has been wiped off or one of the lifters worn. A broken spring would be more instantaneous clatter and the engine would stop in short order when the piston tries to shove the dropped valve closed!!

My car is fine, its Killers that's broken!

Filler cap on the car should be plenty big enough for an endoscope but not sure how good a view you'd get given its location in the cover. Cam cover is easy enough to whip off too without disturbing anything, but I understand why you might leave that for Mountune!

Your early potential diagnosis is good news at least as it suggests that the parts that failed are a part specifically fitted and supplied via Mountune as part of the upgrade - thus fixing it should be a warranty job, with the ball being in their court to get it sorted.

 

[Fuzz]

Oh I wouldn't want to go undoing anything, I just wanted to nose inside. #The endoscope has it's own light source so as long as it'll go in I should be able to see something... at least one one camshaft. :-/

 

[killer_uk]

Oh I wouldn't want to go undoing anything, I just wanted to nose inside. #The endoscope has it's own light source so as long as it'll go in I should be able to see something... at least one one camshaft. :-/

Thanks, that sounds good. I will be giving Mountune a call first thing tomorrow anyway, so all depending on what they say I will give you a call soon after if we need to investigate with the endoscope.

 

[ScoobyDoo69]

Not sure where all the tangents in this thread have gone, and I don't think I can be bothered to respond to them.

I'm about the convert all the PDFs to image files and host them on here. Thanks for putting up the results, much appreciated

 

[ScoobyDoo69]

 

[^JP^]

Did any of the on board video come out OK?

 

[ScoobyDoo69]

If I'm honest I've not had chance to look at any of it bar one video which seems to come out good. It's the one where it went into 2nd when you wanted to boot it in 1st

 

[^JP^]

Hah yeah that was annoying!
I have just been out doing some data logging to get the map updated and the road was dry, so first time getting to use the power from low down and damn it is nice
Really pulls some Gs from a low roll.

 

[ScoobyDoo69]

Low roll? It pulls them everywhere

 

[Kenai]

The 911s graph looks a lot less smooth than I was expecting?

The torque seems to wobble up and own and create what looks like a rather noticeable flat spot around 5000rpm?

Does it feel like that when driving or was the dyno struggling with the car or something?

 

[peterattheboro]

Can't believe the Perodua actually ran

Did it turn the rollers ok?