Well I thought I was nearing the end of a long, horrible and expensive journey. How wrong I was!

To cut a long story short, I had a useless turbo kit fitted to my ls2 which ended up going in the bin.

I then had a complete custom hotside made and bought a few more bits (I wanted a turbo that could get me to around 800whp for quick spooling road use). Specs are,

-Turbo VSRacing 78/75 nxt gen 1.25

-Twin 44mm VSRacing wastegates

-Tick performance cam kit

227/231 | .625"/.605" | LSA114+4 cam

-mantic 9000 triple organic clutch

-Innovate SCG-1 boost/AFR controller

-Alky control methanol kit

-ECS stage 1 fuel system AEM 380lph pump

-FIC 1200cc Injectors

We are not blessed with LS tuning experts in the U.K. but after a lot of research I found someone that’s highly recommended and mainly tunes monaros, VXR8s over here.

Anyway, off it went for tuning where immediate issues were found.

1. Boost would go past spring pressure by a couple of psi and then settle down as the revs increased.
2. KNOCK!

He spent some time trying to find the boost issue but thinks it could be the wastegate positions. Although not ideal the boost could be worked with but the mystery knock can’t.

All in I’m left with a tuning bill of £2700 ($3250) which included fitted supplied injectors, fitting new plugs, road tuning, labour/diagnostics, dyno time and fuel.

Haven’t got a bad word to say about the tuner as he’s brilliant and has a fantastic reputation.

As you can imagine after the money I’ve spent on this build (not gonna say as you’ll laugh) being left with 600whp and further issues makes me feel sick.

Any advise or guidance would be massively appreciated (no, not selling at this point haha)

Here’s some print outs which will mean a lot more to some of you than me.

 

From the tuner

I've put the cursor line in diff places ie on one it's before the KR started so you can see the timing before the kr sets in ie 7.5 degrees (very low)
The boost level is also low at 61kpa /8.8psi (100kpa is atmospheric)​​​​​​​

 

I can't tell from the logs, but is the knock being detected on more than one cylinder? It looks like your AFR is looking good and things don't seem to be too hot. But if your wideband is on the bank that is not having the problem it may not be detecting a lean condition. You may be able to get additional help at the HP tuners forum and posting your logs.

 

are you sure its not false knock or exhaust noise that is triggering the sensors?

 

im curious about this b/c ive got a really clean tune but random knock...

i do have amt diff and motor mounts, maybe this is contributing?