How much boost with pump/alky ?

[Alaskabuick]

Just curious what other people are seeing.

I can only get 90 octane here. Running up to 26.5 lbs with no knock @ 18 degrees advance.

I have my timming ramp down (runing the fast sys)24deg@17lbs,
22deg@ 19lbs, 21deg@21lbs, and 18deg from 23 up...

Is this in line with what everyone else is doing? It seems high to me, but no knock.

Running Razors kit at about 12 oclock on the dial seems to work well.

Temps are cool now 50 deg or colder in the morning/evening.

Dennis

 

[Razor]

I'd bump up the timing.. that low timing will get your EGT's up really fast.

If you add some timing and get a little knock.. add alcohol. Keep your target at 11.0 for air fuel on the FAST. If you find the knob all the way to the right.. call me and order another nozzle and increase the delivery into the motor.

Boost is nothing.. making power is Watch your HP and increase boost only if the car is making more power.. once you run out of turbo.. increasing boost nets nothing but hot air... and this aggravates detonation.

I've got quite a few GN customers blowing past 30 PSI on pump.. question is if theyre making power. Boost seems to be an easy .. Numbers in my sig were done at 26-27 PSI.. my TE67 was done

 

[Alaskabuick]

Boost

To tell you the truth the only reason I am running this boost is I cant keep my boost down under 25? Have a THDP 3.5", have opened up the wg hole, but still haveing issues. Wonder if it is because I have one of the high boost acutators? Maybe a stock soft spring one would help?

Huuum so bump the timming you say.. man that scares me.. but Ill keep a eye on it and try it.

I only have 90 octane like I said.

What about running 100 with alky? I commonly run just straight 100, I run the same tune with that as the 90 w/alky.

What would you suggest ramping the timming at? timming at a given boost level.

I am at 11.5 to 1 on the AFR. I guess I should adjust.

Thanks

Den

 

[Alaskabuick]

oh yeah...

Cranked her up to 22 degrees at 25 pounds, no knock at the same setting on the alky system...Huum this is making sence now.

So If I am getting this right, even though I increased timming, I may be better off because EGT's will go lower. Thus, counter acting the the likleyhood of knock (what you would think considering basic principals) due to increased timming?

Dennis

Dennis

 

[Razor]

Cranked her up to 22 degrees at 25 pounds, no knock at the same setting on the alky system...Huum this is making sence now.

So If I am getting this right, even though I increased timming, I may be better off because EGT's will go lower. Thus, counter acting the the likleyhood of knock (what you would think considering basic principals) due to increased timming?

Dennis

Dennis

Correct

 

[Alaskabuick]

AF Target

Razor,

I was reading in your sticky alky overview that your preference is 11.9 -12.0.

Is their a reason you suggested I target 11.0 on my application? I think the reason is that I am using a Fast system and in your post your reffering to a more stock chip system. Is this right?

If so ,can you expand why the difference? Just curious, I know their has to be a good reason.

thanks,

Dennis

 

[Razor]

Dennis,

You tune the car as fat as you can and have it make power. Never start lean then work your way fat. And you only lean out the motor as an increase in MPH/HP is happening. This is if you plan on keeping the engine together for a long time.

Target 11.0 and go from there. Maybe if I say it this way, two weeks ago my buddy Richie ran 9.8 on his Buick. He was at 10.5:1 air fuel. Maybe going higher in air fuel leaning it out he could make more power.. that we'll see.. but you have to start somewhere and go from there. Rich is the best place to be.

You start at 12.0 with pump gas and alky.. you'll sooner or latter burn a hole into it. your car may end up liking 11.9-12.0.. but start at 10.5 then work your way leaning it out.. if the power keeps increasing.. keep leaning it out. At some point you need to weigh that extra 10-15 HP vs engine life. Thus the drop in air fuel to keep things happy.

Julio

 

[jamier]

just a question for razor

I'm currently running 25lbs boost with 94 octane gas and alky, I started getting about .3 knock at the top end of the track. just started suddenly. I'm still running the stock timing with erics street alky chip, I want to advance my 1-2 gear timing but won't until I'm sure I wont blow something up .I'm running erics suggested 43 lbs fuel pressure. and o2 are in teh 750 range with a low of 740 at wot last weekend. Should I bump up the fuel pressure, then back off the alky since I have the blue knob all the way? Or should I do something else any suggestions.

 

[Razor]

I'm currently running 25lbs boost with 94 octane gas and alky, I started getting about .3 knock at the top end of the track. just started suddenly. I'm still running the stock timing with erics street alky chip, I want to advance my 1-2 gear timing but won't until I'm sure I wont blow something up .I'm running erics suggested 43 lbs fuel pressure. and o2 are in teh 750 range with a low of 740 at wot last weekend. Should I bump up the fuel pressure, then back off the alky since I have the blue knob all the way? Or should I do something else any suggestions.

Add fuel. Your way too lean.

Get the O2's up to 780-800.