R33 boost

[Dischord]

Hey all i am new to the skyline scene and was wondering how much boost the r33 GTS25t has from factory?

also i have replaced the factory boost solenoid with a turbosmart dual stage controller but now in the high setting (which was sett at 7psi on the factory gauge) it detonates. what would be causing this and how do i fix it

this is my first turbo car and i am not to familliar with the full workings of the tubro ecu setup my other car is a n/a 13b rx4 (huge bridgy) so go easy on me

[QuickR33Melb]

Because the factory setting boost gauge (located in your dash) is not measured in PSI. If you are making it reach 7 then you are running alot more boost than you think! Upwards of 14psi which will make your turbo die reasonably quickly.

Do a search on this forum as it has been covered extensively.

Detenation will most likely be caused by your spark plugs. If you are running more boost then you need them regapped to .8 or .7

[Dischord]

Thank you so much.

So getting an artermarket guage is a definte must, do you know what the factory guages are read in??? interested to know

i will be checking my plugs as well

thanks heaps

[someonestolecc]

There are threads about this if you search up mate - not having a go just saying because I can't remember but I have read it here but +7 is something ridiculously bad for your stock turbo.

You should probably go easy as it sounds like you're leaning the engine out - if you don't want or can't get a normal boost gauge (which I highly recommend) then tune the boost controller on the dyno.. atleast then you'll know if it's running dangerously lean.

I think a sponsor in the sponsor section has gauges for $90.

Good luck.

[Dischord]

it wasent all the way up on the +7 but was just under , when we put in the dual stage controller it was wet so when we went to test it all it didd was spin the treads on low setting and the high,

it was only when i drove it in the dry that i noticed it broke up under load on the high setting when it happened i backed off asap then wound the boost down

doesnt do it now,

do you know how much psi +7 is?? on the stock gauge?

[Dischord]

also what plugz does everybody like to use?

[Messiah]

stovk gauge reads in mm's of Hg (mercury) same unit as used for blood pressure i beleive.

Yes! get a after market boost guage, the stocker is useless as you have to convert the reading to something normal ppl understand.

Also keep in mind that at around 10psi IIRC (could be 12) you'll hit factory fuel cut if running a stock ecu.

My recommendation for anyone looking to up the boost of a stocker is to wait until you have your induction zorst and ECU done. these cause the boost to creep up a few psi with just them present, and they will also cope better with the increased boost, stopping you from getting a blood nose on your steering wheel after you hit fuel cut the first time.

[Messiah]

oh and i use NGK iridiums, gapped to .8mm

[Dischord]

if the plug gap was a litte smaller would this cause the car to detonate when switched on to high boost? or would be the factory feul cut i was feeling??although it sure did feel like detonation