Why is my 84 detonating????

[k10boy]

Ok so i put 3/4 tank of 93 from Hess today in my car and was driving around. I met this kid who had a 2005 subaru sti with no exhaust but a fully tuned stock motor. I told him i wanted to race since i can walk all over VR6s i felt pretty confident. Well we took it out on the highway and slowed down to about 50, i had my boost set on 12lbs. On the 3rd honk we both went and my car fell on its face and once it came out of it he was gone. We lined up again and did another rolling start, this time the boost was set on 10. Same thing happened. After we went are seperate ways i had it on 9lbs and it ran great. Is that too much boost for a stock motor or is it the octane??? Help! Thanks

 

[k10boy]

Is there anybody that feels like helping me out?

 

[DannyJov]

I also have an 84 hot air and I'm trying to think of any possibilities as to why it was bogging out like that. Do you think there's something wrong with the throttle body..? Not really sure man..

 

[b4black]

Do you know it's knocking for sure? Are you looking at a scan tool or knock gauge?

I'd do some research on your Quad Air fuel enhancer and decide if you really want/need it.

 

[k10boy]

Do you know it's knocking for sure? Are you looking at a scan tool or knock gauge?

I'd do some research on your Quad Air fuel enhancer and decide if you really want/need it.

Yeah the fuel enhancer was in it when i bought it, im not really sure of its purpose or what it does. I havent plugged my scan tool in it yet. Its not so much of a knock its more like the motor is retarding itself. Like i said, it runs great under 10lbs of boost. I am going to look into the fuel enhancer if the company is even still in business.

 

[k10boy]

I ran out the tank i got ftom Hess and filled it with 93 from the local cumbys, seems to run alot better. What do you guys run for gas in your street cars??

 

[84boostedbuick]

94 octane

 

[k10boy]

Where do you get it? The best i can get is 93 the closest haffners is like an hour away

 

[we4Mateo]

I run methanol injection...

 

[87boostedbuick]

94 is in Ontario at petro Canada

 

[b4black]

I havent plugged my scan tool in it yet. Its not so much of a knock its more like the motor is retarding itself.

Then don't worry about octane yet. 93 is better than many places get. Plug the scan tool in and see what's really going on.