ive done the searching on the site but i cant find anything about my question. do any of you guys know roughly how much boost the stock internals can take? im trying to do some research for my buddy he plans on boosting his xb when we get back to the states.....hp goal is as close to 200fwhp as possible.

 

I have seen people say they are running 6- 10 psi of boost, but i have also heard that at around 170 hp a connecting rod broke. This is just what i have read on here, not in any kind of way facts. But i would imagine if he is wanting 200hp he is going to have to do internal work. This is just my opinion, but would love to see 200 hp out of an xB.

 

You haven't found an answer because nobody knows.. I've tried to find the same answer. It's going to have to be discovered the hard way. If it helps better the community I may be trying to break one just to find out how far it can go.

1nz long blocks can be found around here for 300-500$. I may buy a used one, put it in, boost it high and find it's failure point.

In all honestly, I think the chain of destruction (provided the boost is being done right with the correct fueling) would be clutch > Transmission part > Engine.

Building boost in first is just not a good idea and what I would guess to be the downfall of most attempts (hard lanuches on slicks at the track in 1st = snap) or reving so fast fuel can't keep up... *shrug*

 

well i know a thing or two about boost and cars so he will have an upgraded fuel system so im not to worry about fuel cut.....the setup im looking at for him right now is close to 170fwhp roughly with 15% drivetrain loss.....so since you said upgrading the internals do you know of a reputable company thats makes them? i saw in another thread a guy bought carillo rods but they were custom made.....

 

I beleive that most of the internals are being made custom, not a lot of mass production yet. But here is a thread that might help. ya. you may have already read it.
https://www.scionlife.com/forums/vie...rged+internals

 

yea thats the one i saw.....question for someone with the greddy turbo kit and the supercharger kit....do they come with injectors? on their website they say they it only comes with the manifold and emanage.....but from the threads ive read on here they say its a true bolt up which would in my mind include injectors(basically everything you would need to get it running that day)

 

I know the SC doesen't come with injectors, but most of the turbo packages i have seen come with a bigger injector included.

 

I would sayu do internals first more expensive well will be for the XB but worth it big save on a blown engine ALSO I saw somewhere online a XB with 190 WHP all motor

 

Honestly if there was enough demand for it. The parts would be made> connecting rods bearing caps pistons. NOt going to happen though. Either going to have to go custom machining OR buy a different car. Your not going to get a decent cost/return ratio on modding the engines. Not with the way things are. Im from the old muscle car days. 190 hp doesnt sound impressive to me at all. Get it over 300 Bullet proof and I will start dropping money

 

alright guys, I will put it as simple as possible. To the posters from above please do not take this personal, but Im willing to bet that none of you guys have boosted a 1nz yet. With that said I will give you guys my opinion. Everyone is so quick to make judgments or statements on what the 1nz can and cannot handle. Most of these statements are pretty much bullsh!t cause they come from people who have not boosted a 1nz. When I did the turbo on my xB I was all in this on my own with the exception for a couple others known on this forum. We were all in the same boat and did not really know the limits of the 1nz. So you know what we had to do?? We went out and pushed the limits to see what it could really handle. I found that with my setup on a T20, safe tune on the A/F and timing side I was able to push up to 13 psi on numberous passes without tweaking a rod. I ran at a consistent 6 psi in the beginning and ended up selling the car while running at 8 psi. I think the key part to my setup was the fact that I did a return line fuel system and larger fuel pump and injectors, rail and regulator to keep the fuel in check. Also, what a lot of people dont do and is often overlooked is the fuel trim reset. Its obvious that these ECU's dont like the boost so it is a necessity to reset your fuel trim every couple of hundred miles to clear it out. My car ran good and healthy and put down 123whp on an automatic @only 6psi!! If I would have done a dyno run at 13psi that should put me at around what...almost 170whp on an automatic? Had no problems here fellas

 

Have you thought of bettering the community with a writeup on how you did the return line setup and also any other modifications you did?

Such as.. How did you keep the fueling accurate after adding larger injectors? Did you change the MAF sensor in any way? Did you ever scan the car to see what it was doing as far as knock, timing, etc?

How were you sure you were in the right A/F ratio? Wide band?

I don't mind being told I don't know what I am talking about because I didn't boost the motor yet, which is true, but you being one who HAS, I would like to challange you to posting HOW yo udid it with some good detailed information to help EVERYONE here that may consider their own project.

A community will never advance if everyone holds back how they did custom rigs. Especially seeing as you no longer own the car. I'm not accusing you of hiding anything, but I have not been able to find any detailed information on anything you just stated you accomplished.

Care to share??

 

I think you should do a lil bit more research. I have definitely instructed everyone on how to do the return line. I have never held back one thing about my setup once. Come on, read the dam sticky on top of this forum and look who it was started by...u serious right now man...you must have not been around for a while cause if you have been you should know I have probly helped out almost every single person on here that has gone f/i from back in the day. I wasnt trying to put anyone down, I just dont like how there is soo much misinformation going around by people that havent even tried for themselves. I cant wait to see your supercharger setup when it is complete and I commend people like you for trying things out of the ordinary. As far as keeping constant a/f ratios and what not I had a wideband, used a datalogger to track everything going on internally, but never got to the point of messing around with the MAF sensor. Im surprised nobody has tried a celica GT-S MAF sensor with a bigger adapter pipe.

 

What about just putting a larger liter engin in the xb ? can that be done like a 1.8 L or even a 2.0 L ?

 

The smilie face at the end of my post is supposed to be light hearted. I wasn't attacking you bro, if I missed your posts regarding these things then I must not have searched correctly.

What I meant to focus on was to ask if you were going to do a solid writeup on everything and put it in one spot for easy access for us other folk.

So, you pushed 13psi and never ran off the MAF tables? Sweet.

Still blows that the ECU has to be reset all of the time. What is it modifying and in what way that requires this? Fuel trims? Is it leaning them out or?

I'll just do more searching.

 

I also having done the same setup (t20, injectors, rail, pump, fuel return, wideband) never had a problem with the motor handling it. And I am also here if anyone has questons as to the return line setup for the fuel or the turbo.... That was all easy stuff....

 

What I still wonder is are you guys doing anything at all to tell the ECU you installed larger injectors? Are you spoofing the signal to lower what the MAF see's to correct for the added fuel?

Are you saying that if you just install the larger injectors, live with the bank rich code, and go wide open under boost the ECU will manage the fuel just fine and stay within the proper range?

Sounds crazy... but interested to hear more....

Lastlookcustoms.. do you know how much timing the ECU commands?

 

I myself didnt do anything for electronics to give the ecu the signal for more fuel. I did have the PE cam-con but never wired it in. I was always rich on the UEGO, so I never worried about fine tuning it. Until someone gets adventurous and tries an AEM EMS in the car, I dont think there will be anything that will overcome the factory ecu. If I turbo another one, I am going to try the MAP ECU which converts the MAF to a map style, gives you FULL control on fuel ma[ps, but is still a piggy back unit.

As for now, I will stick with my supercharger....

Also, I am not sure about the timing...

 

more research

 

its also essential to have a front mount intercooler if your going above 6psi

Belinjax is one of the very very few who actually ran a stand alone ECU and he has probably had the most powerful 1NZ-FE engine outputs