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The mkiv Supra Owners Club

Technical information


Guest d-_-b

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Post up any useful NA-T related technical information you feel would be useful to easily see. I will try and organise this information into sections and post them below for easy access.

 

Alternate compression ratio's gained via different GE/GTE piston & head gasket combinations :

(These figures have been gleaned from technical information linked in this thread)

 

T.T. pistons with T.T. head-gasket = static compression 8.1:1 ~ Capacity for more boost than bottom end can take and give a laggy launch ~ Squish 3.25mm

 

T.T. pistons with N/A head-gasket = static compression 9.0:1 ~ Good for 2 Bar (99 RON) ~ Squish 1.14mm (750? bhp)

 

N/A pistons with T.T. head-gasket = static compression 9.2:1 ~ Good for 1.8 Bar (99 RON) ~ Squish 2.15mm (700? bhp)

 

N/A pistons with N/A head-gasket = static compression 10:1 ~ Good for 1 Bar (99 RON) ~ Squish 1.14mm (500? bhp)

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N/A pistons with N/A head-gasket = static compression 10:1 ~ Good for 1 Bar (99 RON) ~ Squish 1.14mm (500? bhp)

 

Can we just confirm this please..... as its contrary to what i have read. Usually guys are staying at 8PSI at 300bhp due to compression ratio this suggests we can go to 14PSI?......nearly double

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