Sputtering?

[Precision]

Hey I have a 1990 Skyline GT-R, with a engine swap for a "fresher" RB26DETT. Let me start off by saying that Takeda Racing did the install, and supplied the engine. Everything else around the engine was pre existing. It looks like this car has been bagged on pretty hard. There are signs of a pre existing roll cage "removed before I bought it" and there are oil leaks coming from the oil relocation kit. Injector 1 and 5 are leaking pretty bad, and the bloody 4WD doesn't work which really pisses me off, apparently Koju at Takeda Racing said he could not find the problem, and that it wasn't the fuse which I checked later as well and it's fine. So I wen't to RacingGreed in Burquitlam to get the car checked out, and they put a Nistune in the car which they tuned to 17 PSI on stock pretty much everything. Needless to say I drove around the corner, and I blew a turbo... So I bought a used turbo and had them install it. I set the boost to .9 bar and when I get up to .9 it starts sputtering and bounces off of .9 bar. So I am wondering what I can do to fix that? There is a bit of shaft play in the used turbo as well. I am not sure what the original turbo condition is though either.
Apparently the original turbo's were taken to Turbonetics to get checked out when i first bought the car, and they said they were fine! So I feel I'm getting jerked around by both shops, and I'm just wondering what I should do about everything ha ha ha. The 4WD, the sputtering, the gas leaks, the oil leaks! lmao This car needs a lot of work there is so much wiring in places that it shouldn't be.. Someone made a mess of this car. I wan't to nurse her back to health any suggestions.

[bobbo]

If I were in your shoes I'd put it in the garage and start taking things apart. Make a list of all that needs to be rebuilt, replaced or fixed. Then I'd spend a bunch of money on parts and start putting it all back together the way it should have been from the factory.
New timing belts/tensioners, new or cleaned mafs, new coils, plugs, coil harness, ignitor, new injectors and seals, and work your way to the rear bumper.
It's just to much of a hassle to try to fix a big rats nest.
Thats my opinion anyway. Best of luck!

[Nismo BKK]

Wouldn't it have been better to rebuild your existing motor instead of swapping in another one in the first place? If my originally motor went, I just spend the money on rebuilding it oppose to putting a motor with a big question mark. Judging from the post, it looks like there is a lot going on your gtr. Was this a project car when you bought it?

[nelsonmxmarc]

1. There is absolutely no way anyone brought these "turbos to be checked". Just to pull the turbos and have them assessed is over 5 hours work at an average garage, not including reinstallation, which means ballpark ~600$.

2. 4wd issue could be as easy as a malfunctioning ATTESA solenoid. I'm not familiar with GTR's as i own a GTS, however if your ATTESA fluid is good, all solenoids are plugged in and receiving power, then they should function properly. Only time i'd be concerned is when the fuse is blowing, meaning its typically a short somewhere, and there are quite a bit of wires to back track for this system..

3. Sputtering on boost is common of plug gap/plug heat range. Misfiring is common on higher boost then stock (OE solenoid is 8 lbs right?), so gap your plugs to .80mm and give it a shot. I'd also recommend swapping them if they haven't been already..

Also, change your fuel filter. If its dirty, it will cause hesitation due to fuel starvation. Fuel pump as well, if it sounds weak.. Typically they'll run high voltage consistantly when they're on their way out - if thats the case, it will be quite audible in the car.

4. Gas leaks from STOCK 440 GTR injectors is VERY common. Some of us have gone through 2.. 3...6... sets before finding ones that were in good condition. Internal o-ring goes, and the leak begins at the seam where the body meets the plastic (yellow) cap. Common, dont fret.. Upgrade when money is there and avoid 2nd hand injectors - otherwise if the deals good, have them rebuilt, otherwise avoid at all costs..

I had leaking injectors, 2 sets actually, one rebuilt and tested to 480 cc, ran amazing, leaked.. Eventually though, they stopped leaking? I donno.. lol They're quirky little f**ks

5. oil leaks are just an improperly adjusted fitting i'd assume. Throw some plumbers tap on the end of each fitting and tighten them back up..


Now, 1 thing you can do to prevent any future issues is to take this coming weekend, plant your a$$ infront of GTRC and begin to read. You'll learn that a LOT of what you just went through is preventable. Save your money, and get to DIY'ing this thing. You'll appreciate the car more in the long run, and also wreak the benefits of a few extra bucks in your pocket!

Good luck

[Skym]

I agree with the above post. Best to do a whole service, replace plugs, filters, fluids, etc if car is second hand. If car has been thrashed, expect driveshaft's, bushes (especially rear subframe bushes), transmission + transfer case, diffheads, engine, steering racks, etc to need rebuilding. Been through this with my car that was pushed hard and is quite normal failures for car that's been driven hard. Skimped in places by buying second hand but good condition parts like diffhead, shaft's, etc. But learnt alot about what causes the failures.

Turbo's can't be checked without pulling apart and checking CHRA and balance of turbo and the ceramic exhaust wheel can't be removed, as it's supposedly glued to shaft (considered to be a non serviceable turbo). Most stock turbo's are converted to hybrids (similar spec to N1 turbo's) due to km, age. Even GTi-R SR20DET or Silvia / 240sx SR20DET turbo's should fit (same T25 flange). Or if they don't, could convert stock turbo's to hybrids via machining the stock GTR turbo compressor and stock GTR turbo exhaust housings to fit the bigger wheels from SR20DET turbo, as from what I understand, that is what the stock GTR hybrid turbo's have / are.

[Precision]

Thank you to everyone for the help. I think I may have fixed the sputtering by putting in NGK Iridium Spark plugs spaced at .80 mm. As for everything else it will come in time ha ha.