INDYPWR Posted January 9, 2006 Share Posted January 9, 2006 i just installed a jspec on my sc300 and im loving the boost !!! my question is what is most hp i can get out of this motor ? right now, im running bpu: -fcd -2 decat -full exhaust -greddy boost controller -fmic -iridium plugs (not sure which one....hehhee) -walbro fuel pump without the boost controller, i can barely hit 1bar...or close to it. with boost controller "on", i can hit 1.2bar but dont want to exceed that. do you think im safe boosting 1.1-1.2 all the time with my bpu's? 1 bar is not enough for me so i do want to boost a little bit more. also, should i change my plugs to colder ones cuz i think im just running the standard plugs in there. any feedback would be appreciated. tks fellas !!! Link to comment Share on other sites More sharing options...
Jake Posted January 10, 2006 Share Posted January 10, 2006 i just installed a jspec on my sc300 and im loving the boost !!! my question is what is most hp i can get out of this motor ? right now, im running bpu: -fcd -2 decat -full exhaust -greddy boost controller -fmic -iridium plugs (not sure which one....hehhee) -walbro fuel pump without the boost controller, i can barely hit 1bar...or close to it. with boost controller "on", i can hit 1.2bar but dont want to exceed that. do you think im safe boosting 1.1-1.2 all the time with my bpu's? 1 bar is not enough for me so i do want to boost a little bit more. also, should i change my plugs to colder ones cuz i think im just running the standard plugs in there. any feedback would be appreciated. tks fellas !!!Hi You have installed a J-spec Supra TT engine and turbos in your sc300? If so you should find that it will naturally boost to over 1.2 bar if the exhaust is fairly free-flowing and the cats have been removed. This is because the turbos on the j-spec TT's have a smaller wastegate than the US/UK spec turbos. You shouldn't really run more than 1.2 bar on these engines because the turbos are already past peak efficiency at that point and also the 440cc injectors will be dangerously close to being maxed out by then. If she's only making 1.0 bar without an EBC you might want to check for boost leaks. You should be running colder than stock spark plugs. Denso IK22 or IK24, or NGK BCPR7ES are recommended. Any pics of the engine install? Link to comment Share on other sites More sharing options...
terawua Posted January 10, 2006 Share Posted January 10, 2006 so now you have what we can buy from japan.. an aristo TT.... nice! all the power and seating for 4.. guess what my first family car is going to be!? Link to comment Share on other sites More sharing options...
supRo Posted January 10, 2006 Share Posted January 10, 2006 You definitely don't have a restrictor ring already in the exhaust? Link to comment Share on other sites More sharing options...
supRo Posted January 10, 2006 Share Posted January 10, 2006 so now you have what we can buy from japan.. an aristo TT.... nice! all the power and seating for 4.. guess what my first family car is going to be!? Aint the sc300 a soarer? Link to comment Share on other sites More sharing options...
Jake Posted January 10, 2006 Share Posted January 10, 2006 yeah James is thinking of the GS300 Link to comment Share on other sites More sharing options...
terawua Posted January 10, 2006 Share Posted January 10, 2006 I stand corrected... bed for me I think.....! Link to comment Share on other sites More sharing options...
INDYPWR Posted January 10, 2006 Author Share Posted January 10, 2006 yes, it's the jspec engine and i think it's the same motor as the 'aristo'. before i had the boost controller, i wz boosting close to 1 bar, very close but not pass 1 bar. with boost controller, i even hit 1.25 bar the other day cuz i was playing around with the unit. i wz told also not to run over 1.2 bar conversatively so i might just set up the unit to 1.2 bar. my exhaust consists of only 1 free-flow cat; i removed the 1st catty right after the turbo and ran 3inch downpipe all the way back to the mufflers. since i have the walbro pump but with 440cc injectors, will it still be safe to boost over 1.2 bar? i ordered some ngk 6097's to replace those iridium ones. i will see if the car runs better. also, since i have the greddy bc, do u guys know what settings shud i use for low and high boost? and as well as for "gain"...? here are some pics of the car, enjoy. took me 1.5 mos to complete the swap. still running the stock 5speed tranny but with upgraded clutch kit by ACT. Hi You have installed a J-spec Supra TT engine and turbos in your sc300? If so you should find that it will naturally boost to over 1.2 bar if the exhaust is fairly free-flowing and the cats have been removed. This is because the turbos on the j-spec TT's have a smaller wastegate than the US/UK spec turbos. You shouldn't really run more than 1.2 bar on these engines because the turbos are already past peak efficiency at that point and also the 440cc injectors will be dangerously close to being maxed out by then. If she's only making 1.0 bar without an EBC you might want to check for boost leaks. You should be running colder than stock spark plugs. Denso IK22 or IK24, or NGK BCPR7ES are recommended. Any pics of the engine install? Link to comment Share on other sites More sharing options...
INDYPWR Posted January 10, 2006 Author Share Posted January 10, 2006 You definitely don't have a restrictor ring already in the exhaust? no i dont have the restrictor ring....but i do have a free-flow catty Link to comment Share on other sites More sharing options...
black cat Posted January 10, 2006 Share Posted January 10, 2006 that is f**kin superb mate, the wheels look sweet. Link to comment Share on other sites More sharing options...
colsoop Posted January 10, 2006 Share Posted January 10, 2006 Agreed i really like the look of that car very stealthy Link to comment Share on other sites More sharing options...
INDYPWR Posted January 11, 2006 Author Share Posted January 11, 2006 tks for the kind words fellas..... Link to comment Share on other sites More sharing options...
INDYPWR Posted January 25, 2006 Author Share Posted January 25, 2006 so what is next bpu? Link to comment Share on other sites More sharing options...
terawua Posted January 26, 2006 Share Posted January 26, 2006 you need to get those photos up in your members garage (and think about joining - 17 bucks a year at the current exchange rate!) Nice motor- CA plates where in the sunshine state are you? Link to comment Share on other sites More sharing options...
blancovich Posted January 26, 2006 Share Posted January 26, 2006 I am basically upgrading my TT to a similar set up. One thing though, I have read and corroborated with different ethusiasts that the FCD is not recommended. I can not remember their exact words but I do remember that the MKIV.com site does not sponsor it. I think you have not tried the "fuel dampener by pass line" You can get this line from an auto parts, and this should also give you some more fuel. http://mkiv.com/techarticles/fuel_bypass_line/index.html the above link for your reference. I don't know much since I am still in the learning curve here but I think the bypass line should provide you some more leverage for fuel. Boris Link to comment Share on other sites More sharing options...
Jake Posted January 26, 2006 Share Posted January 26, 2006 Hi Boris I'm not sure about you US guys but over here we (pretty much) all use FCDs on j-spec Supra TTs. We prefer the FCD from Thor Racing to the GReddy one because it raises the fuel cut threshold to 1.2 bar (adjustable if you want it higher) rather than the GReddy FCD which I believe removes fuel cut alltogether. Also, the FPD bypass is viewed as an unnecessary mod by many over here. Link to comment Share on other sites More sharing options...
terawua Posted January 26, 2006 Share Posted January 26, 2006 The reason they dont recommed the HKS fcd is it scales the output rather than clamping the output from the pressure sensor (which is what the THOR racing one does for example). With scaling you always get underfuelling across the range, but with a clamp type circuit, you get normal output upto the adjustable maximum (1.2bar) but then no more, so you will only underfuel at the top end. The reason they arent recommended is that they dont add any more fuel once you go past the stock boost cut, i.e. about 1 BAR, so it will start to lean out, but as long as you get a wideband AEM or smililar, then you should be able to keep an eye on your AFR's to make sure that you arent too lean. Hope this helps. Link to comment Share on other sites More sharing options...
blancovich Posted January 28, 2006 Share Posted January 28, 2006 Thanks for the explanation. I just went and forwarded you the info, then again my Supra is not jspec so there may be some basic differences. On the other hand the FDB... well it's good info what you are giving, I will look into the max pressure the fuel pump gives (which is basically bypassing the fuel dampener) vs the fuel dampener max outlet capacity. This will corroborate, double check, the need for a FDB or not. thanks again, this info saves me some work! Link to comment Share on other sites More sharing options...
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