Hey guys I'm sure this has been covered but I didn't see it when I searched. So how much psi can you run if injectors and maf aren't an issue? My mods are in my sig if needed.

 

I would get a knock counter to really tell.

 

till it knocks lol

 

Truff.

 

As logical as that question sounds, it's kind of like asking how much bacon can you eat before having a heart attack. Lots of factors in play, and boost/bacon is only one. But, since that's not helpful, 15psi on 93 octane is a good rule of thumb with a safe tune and healthy motor. I'm not familiar with c-tune and whether its maps are user or Josh generated, but if the latter you may want to pose your question to Josh. Otherwise, a wideband, EGT sensor, and knock display are your best bet.

 

I run 17psi MBC on 91oct with A-Tune/k26/6/OEM exhaust, no issues but like everyone has said...all depends on your car-mods/condition

 

I run 18 on 91 but I have tuned my car to run rich, on 100 octane I run 23.

 

Thank you everyone for your wisdom. I think I'll get me a knock counter and proceed from there, I typically like around 15 so be safe.

Also you can never have too much bacon, if the heart attack comes that means you just eat faster

 

LOL nice one Tom

 

Stay under 18psi.
15-17 is a good spot on pump.

 

Great timing on the question. Well, 17.5 on 93 Octane was too much yesterday. DE at Lime Rock Park. 3rd session. Head gasket went.
Wide Fire gasket, lasted 12 DE events (I don't drive on street much).

No knock counter, so what else has been going on in there is a mystery. Running 951 tune from tuner... Vitesse setup. I don't mess with it. AFR's run a bit rich at this boost level which has made me feel better.

There never is a right answer to these questions of life... only what works for you. You could run stock, live conservatively, take no chances, and get hit by a bus.

 

Traditionally (years now) I keep it at 17 psi, but the last few weeks has seen that number climb quite a bit... I do have a head gasket set on order from paragon. Knock on wood

 

What were your a/f ratios before the blown gasket, also widefire hg is not better than stock, no extra protection.

 

Im running, 16psi on pump 93, no issues, With a MBC, LR chips(for a k26/6),Running a K26/8, 3inch exhaust, no maf and stock injectors with a 3bar reg, and slighly learner then id like LOL, But I need new chips. Been running like this for about a year no problem, Weekend fun car.

 

I run 17 and sometimes tickle 18 psi and watch my AFR's. Super 51 LR turbo, stock inj's and AFM, 3 bar, big exhaust w test pipe, FQS set RICH (modern 911's have bee n known to complain of the rich "smell"...though can't seem to get by me ;-)