dandan Posted July 12, 2003 Share Posted July 12, 2003 Hi Guys, I have a question for anyone who is interested: Can anyone tell me what they think the power output from the following spec would be: Jap spec 6 speed manual Std J spec turbos Top small cat still in place Lower cat removed Trial s.steel exhaust (approx 3-3.5"bore up to silencer) Apexi dump valve Running 1.0bar Can anyone give their opinion on the difference in running this spec with optimax or s.u.l compared to normal u.l I'm guessing the ECU will be retarding the ign a fair bit if running on normal. I know this is heading for a BPU sort of question but not found any figures relating to a similar spec. Some people have told me the J spec cars put out well over the rated 280bhp and are up with the uk cars power wise. Do the J specs produce slightly greater torque than the uk cars too? I just wondered what this sort of spec would achieve. Thanks for any opinions guys. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 12, 2003 Share Posted July 12, 2003 Running 1 bar it will be little more than stock. Quote Link to comment Share on other sites More sharing options...
dandan Posted July 12, 2003 Author Share Posted July 12, 2003 thanks terry. I see, i thought perhaps up to 340-350 ish? Has anyone had similar mods and been on a rolling road and got some figures? Quote Link to comment Share on other sites More sharing options...
GavinL Posted July 12, 2003 Share Posted July 12, 2003 Originally posted by dandan thanks terry. I see, i thought perhaps up to 340-350 ish? Has anyone had similar mods and been on a rolling road and got some figures? 325hp I would suggest. As Terry says you are only boosting a few psi more than stock with basic mods. Quote Link to comment Share on other sites More sharing options...
Thorin Posted July 12, 2003 Share Posted July 12, 2003 I made 393bhp at 1.25bar so less than that but more than stock Quote Link to comment Share on other sites More sharing options...
dandan Posted July 14, 2003 Author Share Posted July 14, 2003 sounds good mike, pretty quick then i'd imagine! i'm hoping for 330-340 at 1.0 bar. don't really wanna push the turbos too much just yet. are the j specs really down by 40bhp to the uk's? has anyone got any meaningful figures from same rollers to compare at all. i know this has probably been discussed before but i find it hard to believe there's such as deficit. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 14, 2003 Share Posted July 14, 2003 Originally posted by dandan are the j specs really down by 40bhp to the uk's? has anyone got any meaningful figures from same rollers to compare at all. i know this has probably been discussed before but i find it hard to believe there's such as deficit. No there is very little in it. Both around the 320 ish stock. Quote Link to comment Share on other sites More sharing options...
Thorin Posted July 14, 2003 Share Posted July 14, 2003 I actually believe the J-Spec's to be around 300bhp as standard IMO, but the faster spooling turbo's give more low down torque than the UK spec and so 0-60 and even 1/4 mile there isn't anything between them. Top end the UK specs should begin to walk away slightly. Quote Link to comment Share on other sites More sharing options...
Mark Ayling Posted July 14, 2003 Share Posted July 14, 2003 Interesting.... Can someone give an opinion on (roughly) what mine would be putting out, with the following: Standard J-spec turbos Super AFC AVC-R Hiper, catless "motorsport" fuel pump FSE valve HKS Super Power Flow induction HKS S-Type FMIC Denso IK24's 1.25 bar Cheers! Quote Link to comment Share on other sites More sharing options...
Thorin Posted July 14, 2003 Share Posted July 14, 2003 about 400bhp Quote Link to comment Share on other sites More sharing options...
Steve Cargill Posted July 14, 2003 Share Posted July 14, 2003 Originally posted by Mark Ayling Interesting.... Can someone give an opinion on (roughly) what mine would be putting out, with the following: Not enough Quote Link to comment Share on other sites More sharing options...
dandan Posted July 15, 2003 Author Share Posted July 15, 2003 Regarding mods, am i right in thinking that intake mods other than a dedicated cold air feed don't really gain anything over a decent panel element until higher tuning levels than the stock turbos. What else on the "lower budget bpu" side of things can be done before intercooler or hybrids? Is it a case of upping the boost to perhaps 1.2bar as long as the fuelling stays ok? n.b. already have decent exh, lost 2nd cat, dump valve, fcd, ebc and t.timer. opinions people? Quote Link to comment Share on other sites More sharing options...
Adam W Posted July 15, 2003 Share Posted July 15, 2003 "Induction kits" (cone filters) do bugger all with the stock turbos really. I would strongly suggest getting a dcent IC before getting too boost happy in view of the recent melted engines we've seen on the board. It is becoming apparent that the MkIV is a bit vulnerable under heavy sustained load, even at boost levels which were previously considered "safe" on stock fuel and stock IC. For my money, I'd get a boost and peak hold/warning EGT gauge and check your IC condition out before going above 1bar. Quote Link to comment Share on other sites More sharing options...
dandan Posted July 15, 2003 Author Share Posted July 15, 2003 cheers adam, the car has an hks peak hold boost gauge but no egt as yet. no doubt that won't be too far away. if the intercooler looks ok (not too many bent fins or too much cr@p in there) i may leave it in place and go down the water injection route for now. much much cheaper than a decent fmic even the fully mappable aquamist system so do people think 330bhp is around the reliable limit on a j spec without improved charge cooling and fuel mods? Quote Link to comment Share on other sites More sharing options...
Adam W Posted July 15, 2003 Share Posted July 15, 2003 One approach would b to install a temp sensor just before the thorttle body and see just how high your charge temps are getting at certain boost levels. It's best to know these things rather than guess at them. There was a thread on it recently. Quote Link to comment Share on other sites More sharing options...
dandan Posted July 15, 2003 Author Share Posted July 15, 2003 yes that is something i am definately planning to do. probably go for the maplins wide range temp module until i find a more elegant and permanent solution. interesting to measure temp changes from turbos to plenum. nice to do the same with pressure too, see how much is lost through the core and the pipework. Quote Link to comment Share on other sites More sharing options...
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