adnanshah247 Posted May 26, 2008 Share Posted May 26, 2008 hi wonder if anyone can help me. i need to replace the turbos in my car coz their pretty nackered. a lot of play etc and loosing power from em. there on their last strings. i found a pair of j-spec turbos which got me thinking. whats the difefrence between the j-spec turbos and the other normal ones. are j-specs better? how much power would i expect to get out for maxing these turbos out on my car???? please somebody help! and also some advice on how i can get the power would be great, thanks [OOPS][/OOPS] Quote Link to comment Share on other sites More sharing options...
gaz1 Posted May 26, 2008 Share Posted May 26, 2008 jspec are ceramic and spool slightly faster, the uk spec steel turbo,s can be pushed a little more, but if you go from jspec to uk it is not a straight swap;) Quote Link to comment Share on other sites More sharing options...
Luxluc Posted May 26, 2008 Share Posted May 26, 2008 Before I went for single conversion, I was running my stock Euro-spec turbos with boost controller, GReddy e-manage and GReddy front mounted intercooler. J-sec turbos can run a max of 1.2 bar ; the Euro-spec turbos can run more ... I had them running on 1.4 bar. The power ouput was about 440 bhp. Wou must however know that euro-spec Supras also run 550cc injectors, compared to 440cc injectors for the J-spec Supra. So I think with the same set-up on the smaller injectors, count 20 bhp less. PHR stage 1 Quote Link to comment Share on other sites More sharing options...
edge Posted May 26, 2008 Share Posted May 26, 2008 And the j-specs are massive! Quote Link to comment Share on other sites More sharing options...
adnanshah247 Posted May 26, 2008 Author Share Posted May 26, 2008 thanks for that guys Edge what do you mean about massive??? the share size of the turbos??? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 26, 2008 Share Posted May 26, 2008 And the j-specs are massive! LOL There is a slight size difference in the inducer and exducer in the favour of the J spec turbos, but the UK spec flows more air so in essence more efficient. Quote Link to comment Share on other sites More sharing options...
Homer Posted May 26, 2008 Share Posted May 26, 2008 The exducer on the jspec is of a larger diameter, but has less scroll area a lower A/R so does not work as well at higher boost pressures (> 1.1bar). It's designed for faster spool (i.e greater, sooner torque), but loses out to the export spec once boost pressures and rpm are ramped up. LOL There is a slight size difference in the inducer and exducer in the favour of the J spec turbos, but the UK spec flows more air so in essence more efficient. Now we both know that last sentence isn't strictly correct /nit-picking Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 26, 2008 Share Posted May 26, 2008 The exducer on the jspec is of a larger diameter, but has less scroll area a lower A/R so does not work as well at higher boost pressures (> 1.1bar). It's designed for faster spool (i.e greater, sooner torque), but loses out to the export spec once boost pressures and rpm are ramped up. Now we both know that last sentence isn't strictly correct /nit-picking Well they do flow more air, ergo more efficient;) pic, pic:p Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.