Damien, Joe and Co.
Thank you for regularly updating this well written and descriptive thread. I?m not often on Alfa Owner, but it?s very refreshing to read such an articulate and informative article.
I have a stock GT Jtdm and I visited Reddot for the first time on an Alfa day last year for a remap. I?m not a fan of diesel power so I wanted a map to smooth out the lumpy torque delivery, and (impossibly!) make it feel more like a petrol! I also wanted the map to be sympathetic to the original clutch and drivetrain (75,000 miles).
My GT went on the rolling road, and achieved 198 BHP and 340 torque - I was over the moon at the results! But on the way home, the clutch was slipping and the flywheel occasionally juddered. It?s OK if I slowly feed in the power, avoiding peak torque.
That was my only experience of mapping. The system seemed quite basic ? Accelerate through the gears and the curve emerges on the screen. There didn?t seem to be any way of tweaking the curve to reduce the torque. I may be wrong, I know very little about how this works, but you may want to check this out before you visit.
It?s time I sorted out my drivetrain though. I?m sorry you?ve been guinea pigs, but it is very much appreciated! You guys know a lot more about this than I do. I?m not into modifying like yourselves, and I?m apprehensive about going down a bespoke clutch route myself. Isn't the DMF still the weak point?
Anyway, keep up the good work guys - Thanks again, and I look forward to reading how you get on.
Hi fidge, thanks for the positive remarks....
well I had the original clutch and flywheel on my AL map and just the same as yours the clutch began to slip almost straight away, within a thousand miles in fact...car went back and I had the clover 170 clutch fitted to the car as well as a new flywheel, had a quaife fitted whilst there and that for me is important as the factory diff is a weak point.
TBH the power is almost the last thing to deal with...handling needs attention before or along side the re-mapping.
re your map I would say that red dot are not to blame here, its a clutch with 75k on it, which is approaching the end of clutch life on a diesel car where so much torque is produced, added to which it was only designed to handle 150 BHP so an increase of 48 ponies is around a 33% increase in power....it was inevitable. if they are guilty of anything it would be taking your money without warning you of the potential negative impact...TBH I have spoken with Paulo and made a point of mentioning several things to me in a phone consultation...turbo and clutch being the main point made...I knew this anyway hence I will be replacing the turbo before the final re-map.
anyway back to your transmission question..at 198BHP a stock cloverleaf 170 clutch will be adequate to handle that HP but if mine were not replaced so recently I would be going for the stage two option of the JTD performance dual friction clutch. the DMF for me is a must because it soaks up vibration and torque which would otherwise be transmitted through the drive train, I have driven the SMF set up and it wasn't for me in a daily driver.
so the best balance IMHO is DMF and dual friction clutch, best of both worlds. that should be good for 250BHP+ and 450Nm of torque...more than enough for you and perhaps overkill...its funny with power though, once you have it you will want more so best to engineer the capacity for it at an earlier stage as it will cost practically the same.
in terms of mapping out torque, you can smooth out the delivery to avoid spikes which need to be smoothed out at around the 2700 mark (different on every car though) It's the spikes that kill the clutch not the power. its not so much but HOW it delivered that make the difference.
good luck with your next map, i would say give the car a full service prior and make sure the cam belt and water pump are in good condition and you will be fine