M20 2 ltr block bored to 84.0mm
Single vanos M50B28 crank (thanks march109)
M20 2 ltr conrods
M20 2.5 facelift (low comp) pistons (cheers theo)
Catcam 285/285 degree camshaft (thanks Ant)
885 headcasting
BBTB (Thanks Ian)
Hottuning 6 branch and scorpian system (yes its just as good)
2.8 Motronic chip (thanks Ant)
After assembly, fitting and running in i was very impressed with what i'll call the basic improvement over the 2.5, indeed, a few zoners who have driven this car were suitably impressed with the manner in wich it picked up around 3500rpm.
on or just after 5000 miles of very enjoyable driving i went onto Clive Atthowe's dastec rolling road in Norwich and put down the following:
A fairly respectable result which i was happy with but obviously i was looking for more.
So a few weeks ago i gave the car to Ant for some development with a MAF and some techno-trickery.
First impression on getting back into the car from the turn of the key all the way to 3000rpm was 'fu*k me -theres torque...' as before power below this point, as you can see on the graph, was not abundent.
Also, part throttle with varying loads was very impressive, in fact i was using far less WOT for acceleration in favour of the new found torque. In short it became a plesantly complient 'grunty bastard'.
Initially the WOT maps proved to be a bit problematic but with a bit of trial and a bit more trial we had the first WOT pull to 6800rpm.
Compaired to before its savage even having dropped the diff ratio to 3.7 from 4.1, these is less of a 'coming on cam' sensation at 3500ish with the low end improvement.
The improved drivability of this conversion is but one bonus.
Installed with the MAF are larger injectors that dont have to work at max output, also that damn clicking is gone lol!
Whilst cruising the mpg swingometer is planted firmly toward the 50 point and for a 55 ltr tank 355 miles from full to reserve light is respectable, especially as i was pasting it everywhere with a massive grin on my face.
In short, very worthwhile conversion, the end RR dyno will be the proof but for far better economey, drivability, and power -the Motronic MAF conversion is real bang for buck.
In my opinion Ant has done all of us a serious favour in putting the R&D time into making this a viable alternative to 'other' products and that fu*king restrictive AFM.
Anyone building a stroker, or in fact any m20 owner wanting a bit more instead of settling for a AFM -call Ant
Many thanks from me dude,
Its definatly not 'Miller-time'
Please feel free to comment/discuss,
Brgds
good to see some fresh ideas on this of late.
I will stick to dent repairs for now.
rather than ask a billion questions.
