JE_951

OK i just had my new car dyno'ed and was pleased with the results. But there was some detonation and possibly some miss-fire. The dyno turned out 313RWTQ and 251RWHP on 91 octane. I was supprised to find that the car was hitting 19psi ofg boost at around 3500-4000rpm's but would decrease evenly to about 11psi at redline. so my question is:

Will a higher octane make it not detonate? or could i have a bigger/different issue?

BTW, the a/f was mid 11's all the way from 3000rpm-redline.

Im scared to mess up my car, please help lol.

fast951

First turn down the boost before it blows up. Yes, higher octane helps greatly, it will reduce detonation, but may not eliminate it. (I assume you are thinking of 93oct).

JE_951

yeah. I need to find a addative to use for teh time being until i find a shop or somewhere to fill up with 93/94. the toulene thing may work once i get new fuel lines.

****ty thing is i cant turn down the boost. Well atleast i dont know how too. it is chipped and has a shimmed wastegate. Anyideas on how to lower it?

JE_951

I have a reliaboost, should i take it off and see what happenes to boost? could that be what is making it hit 19psi?

David Floyd

www.boostsciences.com

Instructions on how to adjust the boost settings are there

JE_951

Yeah that piece loks good but are there any little fixes i can do tonight? I need to drive mycar from cali to seattle tomorrow haha. This isnt looking good for me.

ehall

Go buy a bunch of xylene and fix it when you get home. Ofcourse nothing says that you have to get on the boost, until you get things fixed, but adding xylene for octane boost may allow you to worry less, if you are really desperate on time.

David Floyd

Yup..... just keep your foot out of it, surely you don't drive around town hitting 19 psi on a regular basis do you ?

JE_951

nah, ill jsut keep my foot out of it and keep it under 1 bar. Will the xylene ruin/affect anything if its going strait through the tank/motor (800 miles is like 3 fill ups).

David Floyd

You don't need Xylene for you trip, just enjoy the drive

JE_951

cool thanks! i think ill top off a tiny bit with xylene. Not a whole lot though.

JE_951

OK im starting to think that this is more serious. The stock boost gauge is now telling me that at full boost (when im on it) its hitting 2 bar. EIther this guage is wrong or my engine/ turbo is amazing me. off throttle its ok (even slightly its ok) but when you get on it it just jumps strait to 2bar. So either your on or your off, or your feathering. anyone have any idea what could be causing this? i checked most/all the tubes i could find and they were all tight and not leaking.

Weird thing is, the car feelings like it pulls harder everytime i drive it, but i get more and more scared each time i do. Anyone ever encountered this problem? boost rising w/o a obvious reason why?

95Juan

stock gauge?

2 bar on the gauge = 1 bar in real life




thank germany for your confusion.

danny951

haha 951, your sig makes me laugh.. those commercials are freaking great!

JE_951

oh ok. phew, i was worried. Thanks guys. When i get back up to seattle i'll have it looked at and figure out a way to keep the boost lower, and to hold longer. ill keep ya posted.