lancersr20 said:
yes limited stuff for mods but still available esp around Sunway.
If you want cheap performance, raise your boost to 1.2 bar.To get rid of your check light, I can install for you a boost cut eliminator and can enjoy boosting above its limit. I've fixed this device on 3sgte st185 engine and touch 1.8bar for a second only.Lucky it didn't blow.We later raced this car with another Toyota with 340hp(dynoed) 1jzgte and we are on side by side.I don't know how to measure what hp is in this 3sgte since we not yet do the dyno,but I assume it should be around 300hp as it is on FWD platform.Test drive are available for those serious on 3sgte mods things.
So, 1. install boost cut eliminator(dont worry abt your ABS,ACruise...)
2. boost up
3. later....those xpensive things...injector,controller,turbine...etc
ENJOY BOOOSTING!
my experience on bypassing the boost cut on a 3sgte.
most of u know that the 3sgte has a boost limiter at 1 bar. hitting it will trigger the check engine light, and the car will stutter when the gas pedal is pressed. u'll have to switch off the engine and start it again to make it run normally again. however when u do the fault code test, the error code (cant remember the number) will come up saying that u have overboosted the engine. and this will remain until u have resetted the ECU.
i installed a boost controller, which means that i can boost more than the standard .7 bar that the 3sgte runs on factory settings. i was hitting .8 and .9 until one day the boost controller when kaput and i had no means of limiting my boost. most of the time when i floored the car i would hit 1 bar.. and that wasnt good if u're on a test sprint with another car.
from the internet, i learned how to bridge a few wires from the turbo pressure sensor (TPS) and therefore making constant a signal that the TPS sends to the ECU. basically, the signal was modified to make the ECU reading a constant boost was running while i was boosting more. it only costs me less than rm5. one diode from jalan pasar, a solder that i borrowed from my fren and about 30 mins of labour. it was a very costs effective option compared to the aftermarket boost cut eliminator.
then came the most interesting part. testing it to see whether it worked or not.
the MRR from the kepong elevated brige to batu caves roundabout was the venue. coming out from selayang with another 2 co pilots. i had one fren monitoring the speed and boost, while another was looking thru my engine, water temp and oil pressure. after one round to check out everything was fine and if there were any unwanted ppl around ( u guys know who they are) we started the runs.
on the first run, i hit the boost cut. so we stopped the car and check the wirings. after about 10 minutes we fixed the problem of a loose connection to the TPS. coming back from the other direction we tested it again, and this time we hit 1 bar and there we no boost cut. all other stuff looked ok. so everyone was smiling, happy.. a few pats on the back. then we got ambitious.
the last run was from the roundabout to the selayang exit. coming out from the roundabout i tested the boost from 2nd gear and we hit 1 bar, on 3rd 1 bar, on 4th 1.1 bar, on 5th 1.2 bar and just before the speed cut-of at 180km/h *pooof* something blew.
oil pressure was down, the car was stuttering and idling below 800rpm and yes, the dreaded white smoke from the exhaust. limping back to my house and letting the engine cool down, we started checking stuff. the DIY boost cut was intact, nothing melted or anything as we suspected earlier. after removing the intercooler and plugs, we noticed a lot of oil in the plug sockets. with nothing more that we can do we send the car to a mechanic the next day. he told me something broke, but since i cant hear any abnormal sounds except for the low idling i said that cant be the case. so i leave it to him to find out wat happened.
the mechanic dismantled the engine and called me up bout a day later. good news he says, nuthing is broken, but u better come and see for urself. when i got there he showed me two pistons, one with a bad burn mark that melted a bit of the sides, and one with a huge hole in it. the irony was that he was right in saying nuthin is broken, its just melted.
cutting a long story as it is now short, i had another 3sgte engine installed.
point of the story
boosting above the factory settings can be done. but not without proper additions. simply eliminating the boost cut and boosting until 1.8 bar as claimed is achievable, but dont simply take advices at face value. even this one. if you do ur research properly u will find out the 'pinging or detonation' issue associated with forced induction engines. too much air, too little fuel, the mixture dint explode, but burned in the compression chamber hence melting my pistons. and now i know why those little jap engineers installed a boost cut on this engine. a safe way of boosting more would always mean more money spend. i learned the lesson with the cost of a new engine. i hope others wont do the same. increasing boost of a 3sgte from factory settings to dizzying heights can be learned from the internet, from reliable sources that is.. yet still u would have to find out from other examples whether it is true or not. as a rundown on stuff here's wat i learned.
stuff u need
1. boost cut eliminator
2. boost controller
3. injectors
4. fuel pump
5. adjustable fuel regulator
6. fuel controller computer
7. fuel pressure meter
8. other stuff
wat to do with the stuff
1. boost cut eliminator. sounds over the board aint it? but thats wat i called it, and thats basically wat it'll do. eliminate the niggling 1 bar limit those chicken shit little jap engineers put in this otherwise excellent engine. get a reliable one, u might wanna do the rm5 mod.. but if u can spend on the rest of the stuff i listed above, i wud be surprised if u still wanna do the rm5 mod.
2. a manual boost controller would do, as long as it is reliable. once u have eliminated the boost cut, u would still want to control the boost. remember, those japs engineers are clever little buggers.. u dont want to max boost ur baby until it shouts and dies right..
up to this point u're safely boosting as long as u limit the boost to 1 bar (3sgte non RC). meaning u hit 1 bar and there's no boost cut. right now u would dread the almost daily trips to the petrol station as more boost means more petrol consumed. being thrifty malaysians u might learn to slow down. if u're not and has a bottomless wallet plus the urge to be the king of the road, proceed to step 3.
3. factory injectors are side feeds 440cc
NipponDenso #23250 74090. with more boost u will need more fuel to maintain the ideal combustion ratio. minimum plug and play are 550cc injectors from the supra TT. remember, higher boost means more fuel, and u would want to deliver this extra fuel as efficiently as possible into the combustion chamber, hence bigger injectors. if u're not really into plug and play and want to maintain the OE 440cc, u can always add in additional injectors which is controlled by the fuel controller computer.
4. to deliver a constant and reliable fuel u wud need to upgrade ur fuel pump, those walbros are good. here's the actual spec rating
213 lph @ 40 PSI @ 12 volts
255 lph @ 40 PSI @ 13.5 volts
on a lower scale or budget and especially for potong shop shoppers here's another alternative
JZA80 TT Fuel Pump
PN# 23221-46110 (pump)
PN# 23217-46110 (gas filter)
or.. u might want this
Nippondenso PN# 195130 - 1020 (same as RX7 twin turbo)
260 lph @ 43 PSI @ 12 volts (tested)
290 lph @ 42 PSI @ 13.5 volts (tested)
230 lph @ 71 PSI @ 13.5 volts (tested)
this is the OE pump for the RX-7 Twin Turbo (Cosmo).
so now u pick and choose wat pump u want. above specs are obtained from this website
http://www.alltrac.net/tuning/fuel.html
5. adjustable fuel regulator. get one with a fuel pressure meter. means that i dont have to elaborate on point no 7 and u will always know wats the fuel pressure running. remember, one small thing might tell u that something is wrong with fuel delivery and saves u time in diagnostics and costs. with a pedal to the metal attitude, u dont want to blow ur engine prematurely when u fuel pump dies a slow death and decides to take the engine with it.
6. u would need to fuel controlling computer to figure out how much fuel the engine needs once u go above wat those jap engineers set. new gadgets such as the NEO-AFC by Apexi, or R-Fit by Blitz, VPC by HKS.. i've been idling on car upgrades for sometime now i dunno wats the in thing at the moment. but u wud need this especially if you add in injectors instead of a plug and play upgrade. even if u manage to get the PnP injectors, u still would love to have this gadget on board.
7. err as point no 5. dunno if they have one that u can fit in the cockpit. but it sure will look kewl if its there.
8. other stuff wud be mainly meters. exhaust temp to tell u if there's something wrong wif the engine, fuel pressure meter would immediately tell u if u have a major oil leak. water or oil temp to show wats the running engine temperature, i dont trust OE water temp much as it is subject to wirings that may deteroriate over time (remember the 3sgte are more than 15 years old). other stuff wud also means fancy neon lights and a mouth watering sexy chick beside u.. that certainly adds to the pleasure of high speed runs on roads.
i think this is the longest post i've ever made. mainly bkoz the exhilarating feeling of running at 1.2 bar before my pistons gave up is still fresh in my mind. plus the frustration of having to replace the engine due to an uninformed decision of making the rm5 mod still lingers. ppl ask me why im not into upgrading my ride, mainly bkoz i've learned my lesson plus my $$$ are now channeled to different priorities. i still have fun running my 3sgte on the road albeit its derelict condition. boosting a standard .7 on a standard non modded engine may not be 'happening' to some ppl but thats wat i do nowadays. i still have plans to upgrade stuff, but i would always and always do my research first before doing anything. i dont intend to flame anyone with my post, its just a sincere piece of life experience from someone who is now running the 4th engine in his car.
2 sens!!
