Well after I couldnt make it to Powerstation on Saturday, I found these guys literally 5 minutes down the road from me.

http://www.pjmotorsportltd.co.uk/preview.htm

Well respected in the Cosowrth circles and also Evo's I believe now. Their Dyno is one which attaches to the Hubs, eliminating wheelspin /tyre losses so should hopefully give a fairly accuracte figure. I'd expect 12 - 15% transmission losses, assuming 18% fro normal rollers.

So I'm booked in for Saturday morning to have a power and fuelling check completed on my standard car so I have a baseline for some mild tuning I have planned (Fleamap/GM Boost solenoid)

What do you all reckon it will make? I'd be happy with 180BHP at the hubs which would hopefully be around 210 at the fly, however as most know, flywheel figures are an estimate at best

Done some pre-flight checks this morning, throttle 85 Degrees of movement, no codes in the ECU. Compression is good. It's done 115000 and is running on Esso Super (97 Octane)

Ben

Well I'm back Excellent service, highly recommended by myself. A few nice cars in there also, a 2 Skylines / RS2000 / Escort Cosworth /EVO etc etc. Anyway my results:

193BHP @ the Hubs @ 5523RPM
202Ft/lbs @ 2780RPM

Graphs:

Power

Torque + AFR

Boost

I'm happy considering it's completely standard bar a Poweritalia SS 20V (NA) Exhaust and a Forge DV.

Next things for me are GM Boost Controller / Injector Clean / Flea Mapping

Any opinions anyone?

Cheers All

Ben

looks pretty good to me and just above standard power, what i would expect with the exhaust

Pj are very well known and respected in the ford circles, you wont go wrong with them

How much did they charge Benjey & how many runs did they do ?

Hey Benje,

Just looking at your lambda readings, you are very lean coming on boost, in fact very similar to Carphone's standard car.

2700rpm - 12.64afr (peak torque/boost)
3000rpm - 13.38afr
3500rpm - 12.94afr
4000rpm - 12.64afr
4500rpm - 12.13afr
5000rpm - 11.95afr
6000rpm - 11.54afr

From 4500rpm you are ok, but I would be very surprised if it wasn't getting some detonation between 2500-3500rpm. Don't worry, it's not like your engine is going to go pop, you can run with mild detonation for 1000s of miles, but of course it will have an impact eventually.

Anyway, just seems odd that another standard coupe is suffering from poor fueling.

3 Runs for £80, which seems to be a good price considering how much setting up is required (Can't just drive onto it like most rollers )




Very interesting Flea, perhaps they are all like it? (This was on Esso Super btw)

Anyway, when I come to yours for a remap, I assume you will richen the fuelling up so the AFR is nice and flat? If you see on my graph, theres a biro line, where he said that's where the fuelling would be best towards the top end, what are your thoughts on this?

Couple of other questions, I'd be wanting it mapped at 1.2 Bar, on my boost graph it drops away at 5000RPM, will I see similar effects when it's remapped? only with it shifted 0.2 bar upwards?

Whats the big spike at 2600RPM-ish? Is that the ECU seeing rising boost and throwing loads of fuel in, then recovering again by 3000ish?

Is 1.2Bar the max recomended on the standard Turbo? Is 1.4 Feasible (Not to the redline, mid range for example) Can the standard eCU offer variable boost, or would I be looking at a Greddy EBC?!

Sorry for all the questions, I'm trying to learn more here

Thanks again, feel free to pm me Flea to discuss it.

Cheers

Ben

I assume everything on the car appears to be working correctly? No error codes, coolant temps normal etc? The fueling on a standard coupe is no different to any other turbo car. When on boost it should be around 11.8-12afr until redline i.e. 2700-6800rpm. They don't mind running low 12s on good fuel but it makes sense to keep it in on the right side. A non turbo car wouldn't go leaner than 13afr therefore a turbo car to be running 13.4 at peak torque is not ideal. If there are no mechanical issues causing the fueling issues then it can be addressed with good mapping.

Your boost curve is very good peaking at 1bar, no spikes. The fueling dip at 2600rpm is not boost related.

The standard turbo is efficient at 1.2bar no more. It will hold more boost throughout the midrange but still drop off at redline. If the standard boost valve is up to it then ecu can provide variable boost according to rpm and throttle position. The reality with most of the aging EBVs, they don't like taking much more boost without spiking. A new GM or Perrin valve work really well but they aren't much cheaper than a Greddy EBC.

Cheers Flea,

Car is OK as far as I'm aware, I read the errors, of which there were none. Temps OK etc.

I think I'll get a GM Valve, injectors cleaned, then I'll ship it down to you for you to work your magic!