Thread: SR20VE+T low on power, please help!

Hey guys, so after losing a couple of highway runs tonight I figured it was time to seek your professional help

The car made 211hp at 11.5 psi
These are the specs:

-20V bottom end, P11 head, 11:1 compression
-Stock VE cams switching together at 5000
-Very lightly ported gtir manifold, with 38mm external China wastegate
-KKR330 turbo, its specs-Compressor side inlet 60mm- outlet 50mm- 56-trim compressor and 0.42 A/R; inducer 45mm- exducer 60mm Exhaust side 0.86 A/R turbine housing- turbine wheel outlet 46mm. (kinda similar to a gtir turbo I guess)
-S15 444cc injectors at standard fuel pressure and standard regulator running Australian 98 octane fuel and Walbro 255
-2.5" dump then 3" exhaust the rest of the way
-NGK BKR7E plugs gapped to 0.75mm

I'm really not sure where to go here, I know the car should be making a solid 250hp+ but I'm not sure whether the best route is to increase boost or timing to get it making the power it should. If I can get it making 250hp on 12psi I'll be stoked, all input is greatly appreciated!

Timing map-the trace goes to the last two load columns by about 3800rpm


Fuel map


Dyno-cams were switching at 5000/5300 here and car was leaning out to 12.6:1 at 3600-4000rpm. Fixed now.

a good place to start would be by logging your max load, and scaling your maps properly.

Okay, well as I said the maps see max load of 73 by 4000rpm, then stay there to redline.
Do you mean scale the maps so that the trace doesn't go all the way to max load?

Dude your motor should be close to that hp NA. Something is not right. Maybe your spinning the turbo the wrong way?

Why on earth is your max load 70???? What MAF are you running. Also those injectors are way to small for that boost, please don't turn it up if anything turn it down. To be safe at 10psi you should be running 550cc inj. Your timing map is also retarded......and I don't mean retarded as in special, or do I? Get us a full list of what your running and you will get it sorted.

FYI my stock ve made 341whp on 10psi so you need some work. Looks to me like a pegged maf. Good luck.

hey baron, wish i had a dyno at my work!

watch this, 3 to 5 min mark.

biki>bin.

NismoTronicSA Initial Startup - YouTube

seems like a bunch of timing in the mid rpm high load range compared to what i run..

2.5" dump too small

This should not be the issue while a 3in might make more hp this 2.5in is fine for 300+. Heck we just tuned my buddies 240sx sr20det 520whp with 2.5in down pipe.

What turbo did you make 340hp with? Hmm shouldn't be the MAF, it's an RB25 one, physically the same as a VE MAF. The turbo intake is 3" necking down to 2.5". I'm not sure what other aspects of the setup are left that I haven't said...?
What's wrong with a max load of 70 haha? I can change the load limits I believe.
Also 444s should be fine making such pissweak power haha. Plenty of guys running 370s to 250whp.
Thank you for the input!



Yeahhhhhhhh I was talking with Dean today as well...I'm going to have to go Nismotronic SA aren't I...which is great! Everyone loves them, I'm just fuzzy still on how it's simply the computer holding me back. I thought if the tune was sweet then all would be good. (granted the tune is verrrrrry rough atm)



Yeah I'm running a few degrees more than you there, no pinging though. Touch wood.
It would be awesome to get some more input from fellow stock VE boosters... @gio94sr20ve





What he said, and the turbine outlet was only 2.5"

have you checked the compression?

You should post your logs of your TPS voltage/MAF voltage/timing/duty cycle and such here on a full throttle run from about 6000 to redline.

-G