Before start, little information about my car :
I have Skyline GTR R32 1991 with RB26DETT engine. The engine is forged with Nismo piston and ring, i have a new fuel pomp, Nismo thermostat, intake piping HKS, exhaust 3.5 po, big intercooler... My engine have 15 000 KM and he run very well at the stock configuration with the stock PSI.
I run with a TurboXs Manuel boost controller. https://www.turboxs.com/shop/product.php?id_product=137
My problem is, after i used my boost controller to have more PSI, when i push the gaz pedal at maximum for obtain the max acceleration, the engine make an unstable boost and i hear a sputter in my exhaust. This problem happen half the time. Sometimes everything is okay.
I will just change my piping collar because i thought i had a boost lost in my piping.
Idea for the source of my problem :
-Problem with the boost controller (no)
-Boost loss in the piping of the boost controller (no)
-Coils pack, i think all look good (no)
-Bad connection with my boost controller (no)
-Spark Plug Gap (yes) need to set the gap at 0.8 and all work fine!
Thanks for your help!!!
If you have any question you are welcome!