Jump to content
SAU Community

Recommended Posts

Hi guys i was wondering what and how whould an engine behave if the turbo housing is to small. Not using a dyno just pushing it hard. Im thinking the housing is a bit small on my gtr, but im a bit mixed up because the car runs so good. Any clues would be appreciated.

Link to comment
https://www.sau.com.au/forums/topic/460146-turbo-housing-to-small/
Share on other sites

If you guys listen to the motor can you be able to tell from the sound of it. Sorry question sounds dumb. But all the other stuff seem ok. Im at around 1000f on the EGT gauge when im in the gas. What im hearing is like at top rpms when doing a durn out or lauch the rpms seems to get like a scramble sound. Dont get me wrong when i dump the clutch the car goes. I had a friend do a burn out for me so i could record the sound. Cant you by any chance tell what it might be from the sound of the exhaust. ??

Well i cant tell torque drop off no dyno:( timing im not to sure about.

I can say its all cheap stuff.

Cheap ebay 38mm gate $69

Cheap ebay manifold. $159

Cheap hx35 diesel turbo. $370

Stock injectors

Wolbro 450 pump intank $ 110

Power fc. $800

Twin rb25 afm. $180

The motor is stock rods and pistons

Just rebuilt fresh with arp head studs acl bearing, MLS head gasket. Its also has a racefab sump.

And a fully refurbished head.

Its really a budget build.

Juat wish i could figure this out

Edited by MJTru

Well its not detonation. The power fc is at 42 knock max at 14psi. Thats ok to me. My work tends to be tidy with nothing hitting the block (false knock) well untill i get a dyno i guess ill have to stay guessing. Or using my god given talents. I know about the torque drop off part just have no way to figure it out.

Makes me want to move somtimes. So much guys blow up motors here due to tuning issues. Even i did. Untill i first learned my limits and some road tricks to follow, by no means is it a method that is better over using a dyno.

I stop spending big money on parts and turbos. I use cheap ebay and Chinese crap to build, well other than the motor part. I keep it stock just fresh and push the oil issues to the limit. This whole build was under 2k.

The performance is ok. But well worth the money. The only think i have going for me is i can build my own motors. Thats it.

Thanks anyways guys. For everything

Standard injectors are only good for around 400hp to the tyres so if you're making any more than that they're probably at their limit.

What times and mph are you running?

Standard GTR or GTST injectors? Also - dirty injectors may only flow 2/3rds of clean injectors...

You guys might just be right. The injectors are maxing out. And fast. There rb26 injectors. I do want to buy a set of injectors but to tell you the truth. I dont have a dyno so only injectors that come with the lag times would be the set im interested in. Like the stuff on rhd japan. Once i do the formula and input it into the power fc. Its just a matter of clean up the fuel map a bit. Thats all i can do lean some mistakes maybe even blow this motor up and start over again. People say the those injectors are old fashion and i should go with some newer stuff like mega squirt or somthing like that. Does any of.you guys know what would be a good option in this situation. I really wouldnt mind a set of upgraded injectors.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Even more fun, leave all the ADAS stuff plugged in, but in different locations, hopefully avoid any codes!   And honestly, all these new cars with their weird electronics. Pull all the electronics out Duncan, and just shove an aftermarket ECU and if needed a trans controller in, along with a PDM. Make it run basic but race car styled!
    • To follow up a question from earlier too since I had the front bar off again (fking!) This is what is between the bumper and the drivers side wheel And this is the navigator side, only one thing but its a biggy! So basically....no putting coolers in the wheel arches without a lot of moving other stuff. Assuming I move to properly race prepping this car I'll take that job on and see how the computers respond to removing a whole bunch of ADAS modules
    • So I prepped the car for another track day on Wednesday (will be interesting to see coolant temps post flushing out and the larger reservoir, with a forecast of 3-14 being 20o cooler than last time I took it out). Couple of things to mention; since I am just driving the car and not taking a support vehicle, I took the rear seats out and just loaded the back up Team Trackday style. Look at all that space! To cover off removing the rear seat....it is weird (note the hybrid is probably different because it wouldn't have folding rear seats) Basically, you remove the lower seat base, very similar to a r series but it is a clip that pulls forward to release the base rather than it being bolted down. Easy Then, you need to remove the side section of the rear seat on each side. There is a 14mm head nut at the bottom of the side piece, the it slides upwards off a hook at the top to release; you also need to unhook the seatbelt from the loop at the top. Then the centre piece is weird. You need to release/fold the seats forward with the tab in the boot on each side From there, there are 2,x12mm headed bolts holding the rear of each seat to the folding bracket, under the trim between the rear seat and the boot (4x christmas tree clips there, they suck). The seat is out but you can see where the bolts attach to the bracket
    • As discussed in the previous post, the bushes in the 110 needed replacing. I took this opportunity to replace the castor bushes, the front lower control arm, lower the car and get the alignment dialled in with new tyres. I took it down to Alignment Motorsports on the GC to get this work done and also get more out of the Shockworks as I felt like I wasn't getting the full use out of them.  To cut a very long story short, it ended up being the case the passenger side castor arm wouldn't accept the brand new bush as the sleeve had worn badly enough to the point you could push the new bush in by hand and completely through. Trying a pair of TRD bushes didn't fix the issue either (I had originally gone with Hardrace bushes). We needed to urgently source another castor arm, and thankfully this was sourced and the guys at the shop worked on my car until 7pm on a Saturday to get everything done. The car rides a lot nicer now with the suspension dialled in properly. Lowered the car a little as well to suit the lower profile front tyres, and just bring the car down generally. Eternally thankful for the guys down at the shop to get the car sorted, we both pulled big favours from our contacts to get it done on the Saturday.  Also plugged in the new Stedi foglights into the S15, and even from a quick test in the garage I'm keen to see how they look out on the road. I had some concerns about the length of the LED body and whether it'd fit in the foglight housing but it's fine.  I've got a small window coming up next month where I'll likely get a little paint work done on the 110 to remove the rear wing, add a boot wing and roof wing, get the side skirt fixed up and colour match the little panel on the tail lights so that I can install some badges that I've kept in storage. I'm also tempted to put in a new pair of headlights on the 110.  Until then, here's some more pictures from Easter this year. 
    • I would put a fuel pressure gauge between the filter and the fuel rail, see if it's maintaining good fuel pressure at idle going up to the point when it stalls. Do you see any strange behavior in commanded fuel leading up to the point when it stalls? You might have to start going through the service manual and doing a long list of sensor tests if it's not the fuel system for whatever reason.
×
×
  • Create New...