FOSTA Posted January 9, 2013 Share Posted January 9, 2013 (edited) I don't think n/a pistons with t.t headgasket is squish over-size buddy. People have been running it solidly and reliably for ages and you can push more boost than with the standard n/a with n/a compression. It is buddy lol but you can still achieve 500bhp with ease! Basicly what you have to think about is your using a thicker headgasket so that means the head sits further away from the block which affects the squish! The only way your going to keep the stock squish level is by keeping the stock GE headgasket. But this method of TT headgasket and GE pistons has proven to work really well so I wouldn't worry about it I'm only thinking about it as I don't want to have too low of a compression as well as a bad squish! Edited January 9, 2013 by FOSTA (see edit history) Quote Link to comment Share on other sites More sharing options...
FOSTA Posted January 9, 2013 Share Posted January 9, 2013 NA pistons with BL 2.5mm gasket is the win imo, that's what k0r3an used in the states and got some very big numbers from and certainly the route i'd go which is more than enough for most. Was he running on pump fuel mate? Just as I've seen loads in the states running 600+bhp with just the TT pistons fitted but they are running on E85 fuel. Quote Link to comment Share on other sites More sharing options...
abtin90 Posted January 9, 2013 Share Posted January 9, 2013 I'm currently NA-T got the Boostlogic head gasket that Dans mentioned fitted too. Just need to get the car mapped now with Ryan in the coming weeks. Quote Link to comment Share on other sites More sharing options...
FOSTA Posted January 9, 2013 Share Posted January 9, 2013 I'm currently NA-T got the Boostlogic head gasket that Dans mentioned fitted too. Just need to get the car mapped now with Ryan in the coming weeks. 2.5mm? I know its not mapped but what dose it feel like to drive off boost mate and what compression do you think your at? Cheers dude Quote Link to comment Share on other sites More sharing options...
Dan_Turism0 Posted January 9, 2013 Share Posted January 9, 2013 (edited) Was he running on pump fuel mate? Just as I've seen loads in the states running 600+bhp with just the TT pistons fitted but they are running on E85 fuel. have a read of his build thread mate - http://www.supraforums.com/forum/showthread.php?529562-getting-boosted! lovely clean NA-T Edited January 9, 2013 by Dan_Turism0 (see edit history) Quote Link to comment Share on other sites More sharing options...
abtin90 Posted January 9, 2013 Share Posted January 9, 2013 2.5mm? I know its not mapped but what dose it feel like to drive off boost mate and what compression do you think your at? Cheers dude To be honest mate I haven't driven a stock NA in a while so it would be hard to compare. But off boost it seems fine haven't noticed a massive difference. According to Boostlogic the compression should be in the 8:5:1 range. So you can run quite a bit of boost with it. I got it after seeing good results on club NA-T with pump fuel. Here's a link to the hg I got. http://www.boostlogic.com/catalog/p140788/Boost-Logic-2.5mm-Head-Gasket-Toyota/Lexus-2JZ-/product_info.html Quote Link to comment Share on other sites More sharing options...
abtin90 Posted January 9, 2013 Share Posted January 9, 2013 NA-T 1. tkddav3 2. -welsh-stealth- 3. Gixer_81 4. FOSTA 5. Abtin90 6. Noz NA-T builds: 1. d[-_-]b 2. caineoo 3. Josh42 4. Rich.2211 5. FOSTA ( currently building a second NA-t engine, aiming for around 600+ bhp with this one) 6. -welsh-stealth- (also on the 600bhp+ engine NA-T build band wagon. Man cave/shed build) 7. Pulley , 350-400bhp , 600bhp+ on second engine+box Quote Link to comment Share on other sites More sharing options...
abtin90 Posted January 9, 2013 Share Posted January 9, 2013 Just thought I'd add myself and noz to the list of NA-T members Quote Link to comment Share on other sites More sharing options...
FOSTA Posted January 9, 2013 Share Posted January 9, 2013 Hummmm I might just do the TT pistons and TT headgasket combo then and if its terrible I can just change the HG back to GE or somthing inbetween. I'm getting the head itself skimmed anyways so that its true, so that will heighten the the compression slightly. Quote Link to comment Share on other sites More sharing options...
abtin90 Posted January 9, 2013 Share Posted January 9, 2013 Hummmm I might just do the TT pistons and TT headgasket combo then and if its terrible I can just change the HG back to GE or somthing inbetween. I'm getting the head itself skimmed anyways so that its true, so that will heighten the the compression slightly. Why not go with GE hg and TT pistons first and then change the headgasket if you want to lower the compression more later. Dr Jekyll made over 500bhp with TT pistons and said it was really nice to drive off boost Quote Link to comment Share on other sites More sharing options...
d-_-b Posted January 9, 2013 Author Share Posted January 9, 2013 >>Updated the front page with the links posted guys as well as added NA-T members who have posted up in here to the lists Quote Link to comment Share on other sites More sharing options...
David P Posted January 9, 2013 Share Posted January 9, 2013 (edited) I don't think n/a pistons with t.t headgasket is squish over-size buddy. People have been running it solidly and reliably for ages and you can push more boost than with the standard n/a with n/a compression. It's generally accepted that when the piston to cylinder head clearance exceeds 1.5mm the squish effect is severely diminished. These figures have been gleaned from technical information linked in the thread, if you know better please enlighten us? 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) Edited January 9, 2013 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
David P Posted January 9, 2013 Share Posted January 9, 2013 b;3574072']>>Updated the front page with the links posted guys as well as added NA-T members who have posted up in here to the lists NA-S associate membership? Quote Link to comment Share on other sites More sharing options...
Al Massey Posted January 9, 2013 Share Posted January 9, 2013 I'm currently doing an N/A-T build No set goals as yet as I'm building the whole car as well, but once running I will be fine tuning Quote Link to comment Share on other sites More sharing options...
d-_-b Posted January 9, 2013 Author Share Posted January 9, 2013 NA-S associate membership? Very true! Sorry David, my bad there. You are now in the listings! Quote Link to comment Share on other sites More sharing options...
Fly Posted January 9, 2013 Share Posted January 9, 2013 great start to this topic with lots of good info already from builders to prospective builders. Good news though as my Westfield has just driven away so im now in the market for a Supra to go NA-T. Keeping beedy eyes on this subject. Quote Link to comment Share on other sites More sharing options...
Caineoo Posted January 9, 2013 Share Posted January 9, 2013 It's generally accepted that when the piston to cylinder head clearance exceeds 1.5mm the squish effect is severely diminished. These figures have been gleaned from technical information linked in the thread, if you know better please enlighten us? 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) Ah thanks for explaining not sure that you'd want to go as high as 500bhp on the n/a - n/a combination?? Or were you putting it there as a guide? Quote Link to comment Share on other sites More sharing options...
David P Posted January 9, 2013 Share Posted January 9, 2013 Ah thanks for explaining not sure that you'd want to go as high as 500bhp on the n/a - n/a combination?? Or were you putting it there as a guide? Will be boosting mine to .95 Bar soon. The bhp 'round numbers' are there because that's what folks want to know. At the boost pressures given, each configuration would be around 18:1 dynamic compression. Quote Link to comment Share on other sites More sharing options...
Caineoo Posted January 9, 2013 Share Posted January 9, 2013 Will be boosting mine to .95 Bar soon. The bhp 'round numbers' are there because that's what folks want to know. At the boost pressures given, each configuration would be around 18:1 dynamic compression. Ah i see. Interesting to see how that goes Will it be realiable at that bar? Quote Link to comment Share on other sites More sharing options...
d-_-b Posted January 9, 2013 Author Share Posted January 9, 2013 (edited) Im guessing if the blocks been skimmed then its best to run a thicker N/A / tt head gasket due to the thin starting thickness of the NA stock gasket? Edited January 9, 2013 by d-_-b (see edit history) Quote Link to comment Share on other sites More sharing options...
David P Posted January 9, 2013 Share Posted January 9, 2013 (edited) Ah i see. Interesting to see how that goes Will it be realiable at that bar? Dynamic compression North of 18(s):1 is the Kamikaze Line for a daily-driver. Edited January 9, 2013 by David P (see edit history) Quote Link to comment Share on other sites More sharing options...
fixcz Posted January 9, 2013 Share Posted January 9, 2013 GE combustion chamber (head, gasket, piston) 55.5cc + GTE head gasket extra 6.04cc Gives .085”(2.15mm) squish = 61.54cc = 9.12: 1 GE combustion chamber (head, gasket, piston ) 55.5cc + GTE piston extra 6.7cc Gives std GE squish .045"(1.14mm) = 62.2cc = 9.03: 1 GTE combustion chamber (head, gasket, piston) 66.6cc + GE piston minus 6.7cc Gives std GTE squish .055"(1.4mm) = 59.9cc = 9.34: 1 Great picture and measurement explain all questions.well done:notworthy Quote Link to comment Share on other sites More sharing options...
fixcz Posted January 9, 2013 Share Posted January 9, 2013 Top and bottom of it is TT pistons and TT headgasket combo have been tried and tested a few times and because of it resulting in a lower compression than a stock TT and with it also affecting squish! It's apparanty too slugish off boost. TT pistons - GE head gasket is good for 500bhp on pump fuel TT head gasket - GE pistons is good for 500bhp on pump fuel So if we are wanting a good responsive 600bhp NA-t we need somthing along the lines of TT pistons and a headgasket inbetween the stock thickness of the GE and TT. I'm thinking around 0.9-1mm of thinkness. ? best way tt piston gte hg 1.3mill but take off 2 multilayer :1.0mill best compromise Quote Link to comment Share on other sites More sharing options...
d-_-b Posted January 9, 2013 Author Share Posted January 9, 2013 Am in the process of sorting out the Club NA-T group everyone. Once tidied up I will send out an invite to everyone in the list (unless you are already a member of the group ofc ) Quote Link to comment Share on other sites More sharing options...
buster Posted January 9, 2013 Share Posted January 9, 2013 NA-T 1. tkddav3 2. -welsh-stealth- 3. Gixer_81 4. FOSTA 5. Abtin90 6. Noz NA-T builds: 1. d[-_-]b 2. caineoo 3. Josh42 4. Rich.2211 5. FOSTA ( currently building a second NA-t engine, aiming for around 600+ bhp with this one) 6. -welsh-stealth- (also on the 600bhp+ engine NA-T build band wagon. Man cave/shed build) 7. Pulley , 350-400bhp , 600bhp+ on second engine+box 8. Buster , 400-450bhp Quote Link to comment Share on other sites More sharing options...
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