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Black magic Mk5 GTI track car

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danishmkvgti:

--- Quote from: fuscobal on April 05, 2012, 04:26:27 pm ---I don't know why is this car so heavy. With the door cards removed I will get to 1450kg wich is still more than what I've seen around. At this point I don't know what else to take out of the car without compromising too much ? (still want the aircon and electric windows)

PS : Why a Cupra engine Danish ?...the difference should be only in the pistons !

--- End quote ---

The Cupra benefits from a better flowing head, the S3 cams, lower compression and stronger rods, i went from the low curve to the higher one by moving to the cupra engine, and i must say it's the best thing i've done (the last year  :grin: )

fuscobal:
Danish, I've already got forged rods and S3 cams. The lower compression comes from the pistons and if mine are damaged I might as well order forged ones since they cost the same as new OEM ones. What do you mean by better flowing head ?

the bruce:
I don't know if the S3/Cupra head has larger ports (don't believe this),
but it has a different (more heat resistant) alloy though.

fuscobal:
In the unhappy case of finding marks on the pistons, I will have to change them. As the OEM ones cost about the same as Je pistons, I'm thinking of upgrading them. My OEM compression is 10.5 (highest of all, being my AXX was the first TFSI engine code). Je has CR of 8.5:1, 9.5:1 and 10.25:1 with bore 82.5(OEM), 83 and 83.5. I will not go with 8.5 but wouldn't know what to choose between 9.5 and 10.25 (they also make custom so I'd go a little bit lower but not too low). Also, in terms of bore, should I go 83 just to be sure ? (even if the actual diameter is still closer to 82.5). How does lowering the compression affect everything on this engine ? (updated REVO software ?, engine temps....)

danishmkvgti:
the comp. of the cupra 9,8:1 gives more headroom for boost. so i would say the 9,5:1 je pistons would suit your needs Fuscobal  :happy2:

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