Hey guys I got some bad news.

Today I did some testing with my Interceptor gauge and my pulleys.
Those who have smaller pulleys need to look into running higher octane or meth injection as you are hurting the motor.

On a 2.9 in third gear runs I see upper 7 range of Knock Retard and on a 2.8 mid 8 range.
The stock Stage 2 pulley and I see no knock retard what so ever. These runs are with 95 octane fuel.

The truth is while smaller pulleys are a great mod with out the support they actually hurt us and hurt our motors. I'm back on Stage 2 pulley for now and with my testing I see I'm actually running faster due to the pcm not pulling timing in relation to knock.
So when I go meth injection I'll throw the 2.8 back on and be a force to reckon with .

Just letting you guys know!

 

so you have zero cooling mods?

 

Going meth when I get money (I'm broke) which will be awhile but yeah no cooling mods.







Unless Devils Own want to give me a hell of a deal to rep them for life!
(I guy can dream right?)

 

how about an exhaust? having header, downpipe and catback are gonna lower your EGT temps, your manifold pressure and possible excessive cylinder pressure and heat reducing engine knock. I live at about 800 ft above sea level and i see 0 degrees of knock all the way through 3rd gear and into 4th when i do runs (w/ 2.9 and stage 2 seeing 15psi max), that was during fall in 70 degree ambient temps. At that time i was running full exhaust, dual pass, aftermarket intercooler pump and slight SC porting.

But, i guess with the amount of money spent in the exhaust, dual pass, and intercooler pump i could have 2 tuned devil's own kits.

 

I use 92 octane on my stage 2. I don't get any knock. I was going to get the 2.9, but now you have me thinking.

 

BINGO!!!!!!!!!!!!! You could be making more power, don't you wish you went differently now. lol.

 

Ummm.... How about tuning the timing?

 

Well, having a full exhaust is a good route to go if you're going the performance route anyways. i kinda like where i'm at, i'm not into the meth injection cause i don't want to have the extra tune and more complicated setup.

I have invested in a dual pass, front mount and aftermarket pump instead which i find reliable enough now, definitely won't provide the gains and drastically low temps, but i don't have to fill it up constantly which i like. didn't see anything above 90 degrees the other day (32 degree ambient temp) when i did a 2nd through 3rd gear run. (forgot to add that the system is still getting out all the air so at this point)

 

On my setup I either run 93 or 100 octane and if I do see Knock its never higher then 3.

 

this thread makes me laugh.


i was actually concerned till i saw you have virtually NO other mods.

 

Is it really necessary to be such a negative Nancy about this thread? The OP's testing reinforces a good point to all SS/SC modders (including the new ones) who might think: smaller pulley = cheap, easy power, when in reality, this is a dangerous proposition without supporting mods. Go take another MIDOL!

 

with the heat, all you can do is pull timing, which is already being done by the ecu, cooling mods would allow for more aggressive timing.

 

True...
Tuning w/o cooling mods would allow you to run the pulley, and not damage the engine, as the OP said is happening.

 

gee getting bent out of shape are we?


i remember coming on the redline boards in 04.. being a grand prix GTP owner... and making a post explaining to all the newbs there that dropping a pulley with no coolant or exhaust mods will result in knock.


so threads like this make me laugh.

 

wow bro, must be the fact that you have almost no real supporting mods. I have the 2.85 on my stage 2 and on my interceptor the only knock I see is when I shift for just a second. I have CA header, and 3" catless DP and soon to be GMPP exhaust...now when I had the Intense PCM in, 4th gear would get 12*+ knock not even at WOT...either do some exhaust work or cooling mods and you'll be fine...

BTW, the only real cooling mod I have is a NEW Cobra intercooler pump (which is actually the same as our stock pump)

 

at least you have some exhaust mods

 

annnnnnnnnnd....no knock

 

Ok let me explain.
I've known knock was happening just not to that extent and have been considering meth injection as my solution for months I just haven't had the money (I'm broke) to do so yet. I've posted several threads on meth injection already and am well verse in it.

I have no access to a tuner and have no plans to tune as this is a daily driver that I take to the track maybe once a month. I was letting others know as on this site there are many people who swear up and down going to 2.9 on stage 2 with no other mods is fine.

This is wrong information and while your making instant boost your losing power as the ecu pulls timing to save your engine. Thus even 2.9 will make you slower than regular stage 2.

Get cooling mods.
Go dual pass option b and / or cobra heat exchanger.
Go meth injection.

That is the solution.
I prefer meth injection as it has more benifits than dual pass and cobra he and cools far better than both of them combined. But that my opinion.

So again this is just a warning or advisory of sorts to those who are dropping pulley sizes with out cooling support and octane support.

 

I really like the wheels on your cobalt

 

thank you sir.... however i am supporting the blacked out look at the moment

 

ok so whats the cheapest, easiest, most effective cooling mod...im running a 2.9 so apparently i need to do something...

or will a catback solve the problem??

 

i beleive a header downpipe and exaust is a better way to go first. you need to get the thing to breath to drop the egt's. that right there can open up 15+hp, as well as stopping knock from smaller than stage 2 pulleys. also the cobra heat exchanger would be the next thing on the list and does help drasticly.

with meth to get the true benifit of it, you need to tune, mainly advancing the timing. the downside to this is if you run out of meth and dont know it, you run in to a dangerous situation, creating lots of knock.

 

What is the mixture in our intercooler's? All coolant or 50/50 mix?

 

wow alot of people saying that they only see this amount of knock...who the **** are ur tuners because knock is not acceptable to me

 

2.9 on stage 2 will not slow you down compared to just stage 2