Octane Booster bad for your engine?

**Runicdionysus** · 06-25-2015

Here's the deal, I was getting 2-3* of KR in 2nd and 3rd gear pulls with a 3.4" Pulley, CAI, 91 octane(highest we have here in New Mexico), 2.5" DP, Autolite 104s, and a tune by Reptile, went to Autozone and bought the $25 NOS octane booster, and now I have 0* KR through all gears and RPMs. Is Octane booster bad for your engine? Does this mean I can go down to a 3.3" pulley for a day at the drags if I still have no KR?
Thanks.

**Scottydoggs** · 06-25-2015

most of the time that stuff is just snake oil.

was the engine up to temp when you tested this out? knock sensors dont work when the engines cold.

**Runicdionysus** · 06-25-2015

Originally Posted by ScottyDDDoggs

most of the time that stuff is just snake oil.

was the engine up to temp when you tested this out? knock sensors dont work when the engines cold.

yeah it was up to temp, forgot to mention I have a 180 thermostat. It was about 185-190 when i was testing it if I remember right.

**Fivefingerdeathpunch** · 06-25-2015

I'd get a bigger downpipe and maybe a plog before thinking about making more boost.

If you already see KR with a 3.4, that KR is worse for the motor compared to 2-3 with a 3.8. There is more pressure on parts now with more boost.

**Slick2500** · 06-25-2015

Some of the stuff they put in those commercial octane boosters are not very good for your engine when run for a long time.
There are instructions on how to make your own octane booster with touleen(sp) on Google.

**FordMan77** · 06-25-2015

Might be time for some headers so you don't have to run the "octane boost", which most likely gave you 93 octane at best. Like Scotty said, it's snake oil and doesn't do a whole lot. Is this 3.4 on a Gen V or a Gen III?

**Runicdionysus** · 06-25-2015

Originally Posted by FordMan77

Might be time for some headers so you don't have to run the "octane boost", which most likely gave you 93 octane at best. Like Scotty said, it's snake oil and doesn't do a whole lot. Is this 3.4 on a Gen V or a Gen III?

it's on a Gen III, I do plan on getting some SD headers in the near future once I move into my new apartment.

**Slick2500** · 06-25-2015

Originally Posted by FordMan77

Might be time for some headers so you don't have to run the "octane boost", which most likely gave you 91.3 octane at best. Like Scotty said, it's snake oil and doesn't do a whole lot. Is this 3.4 on a Gen V or a Gen III?

Fixed.

**Scottydoggs** · 06-25-2015

id scratch the 3.4. i had a bit of trouble running a 3.4 with headers rockers, and 93. i did have high miles. and owning a tuner was all that made it work. stock tune would not cut it at all.

**Slick2500** · 06-25-2015

Originally Posted by ScottyDDDoggs

id scratch the 3.4. i had a bit of trouble running a 3.4 with headers rockers, and 93. i did have high miles. and owning a tuner was all that made it work. stock tune would not cut it at all.

He doesn't have stock tune OP says Reptile tune.