Guiliett JTDM Flash Upgrade - Alfa Romeo Forum
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(Post Link) post #1 of 3 Old 12-09-17 Thread Starter
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Guiliett JTDM Flash Upgrade

I bought my Giulietta new in 2012 and initially it performed well, but after its first factory software update after 5k kms, it developed a bigger flat spot off idle and at low throttle openings. The dealer said there's nothing they can do and that all small capacity diesel turbos have this "issue".

This delay was most evident when trying to enter into fast flowing traffic from slow speeds or when stationery like at a stop sign positioned near the top of a steep hill. I searched for a flash tune in Brisbane Queensland and found an agent of a UK company called Car Performance that specialised in VW flash tuning but also did Alfas and BMW's.

A mobile van came out and and he told me the various options available and I told him a bit of extra power would be good, but that I mainly wanted to get rid of the flat spot/hesitation. He then captured all relevant settings from the CPU and e-mailed it to the UK for review.

The next day he came back and presented me with various flash options with typical dyno chart readings of what could be done. I removed the economy, and full race options and I settled on their middle of the road 40% power upgrade which I was assured would eliminate the dreaded flat spot. He then uploaded that tune and I was instructed to give it a bit of a thrashing for 100km to force the new settings into action.

The car felt a little bit more responsive initially, but after 150km the 40% power increase was very evident - what a powerhouse and no more flat spot/hesitation. Rather that 1750 before peak torque hits it now comes on strong from 1200 rpm and the car is highly tractable and pulls cleanly at all revs.

Previously the motor ran out of puff around 4000 but it now pulls cleanly up to 5000 and a few times I had it up to 5500 rpm with no sign of tapering off. I rarely drive the car hard as I'm very aware that the 165kw and 450nM will be too much for the clutch/gearbox. As I mentioned, I only wanted to eliminate the flat spot.

Turbo whine increased noticeably from 1000 revs and fuel consumption only went up by 10% or so. My Giulietta is a beast at the lights with all that torque available from just above idle and I rarely have to use more that 1/4 throttle. It leaves my son's XR5 for dead for the first 100+ metres and also gets off the line much faster than WRX's.

Well worth the $1300 AUD investment and no issues for the last 5 years.

Last edited by garybryant; 12-09-17 at 07:47.
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Have you run this setup on a dyno? The general experience, as far as I have heard, is that the stock clutch starts to slip around 390-400 Nm. That is why you see most reasonable stage one tunes being torque limited around those figures.


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(Post Link) post #3 of 3 Old 15-09-17 Thread Starter
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No I haven't had the Giulietta dynoed as I don't want the clutch to be damaged during full throttle runs.

Yes, the clutch does start to slip if much more than 1/2 throttle is used over 3000rpm but when this happens I always backoff.
Most of my driving is done using less than 1/4 throttle and no more than 2500-3000rpm where the acceleration is still fantastic AND no flat spot off idle. Even at these reduced settings, the car still far out-performs a standard Giulietta.

When this clutch does expire I will review getting stronger clutch plates installed (if available) for increased durability.
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