Question about A/F ratios

[Outlaw1]

I took it out tonight after work for some more serious pounding. I had to zip tie the hose on because it kept popping off. While the hose was off i was easily seeing 6+ degrees pulled back no problem. Now with it connected, i turned up the boost to about 23psi. I'm seeing about 2-3* being pulled back in the same spot(5700ish). Is it possible that the stock FRP was damaged from the vacuum line not being hooked up all that time? Or is it possible that the stock FPR is no good to run with a rewired 255LPH and 23psi of boost?

Thanks.
If that hose keeps popping off you will be rebuilding your engine in the near future.

23 psi depends on your combination of parts, your tune and of course, fuel quality.

[JET]

Knock can also be caused by imperfections in the piston or head surface, which yours may have from running so lean.

No, the FPR wouldn't be damaged from that.

[Shane@DBPerformance]

You might want to ziptie every vacuum line on the car, if you are going to run more than stock boost.

[Outlaw1]

You might want to ziptie every vacuum line on the car, if you are going to run more than stock boost.
I second that.

[Onefast99gsx]

All were zip-tied except for that one. My bad. I backed the boost down to right about 20# just a bit ago. I can run her hard 60-90 with just about zero knock. If i go much over 20# like i was doing yesterday she'll start to knock in 3rd gear. Perhaps alky injection is only good in my car to 20psi. Either that or i'm over-running the stock FPR. I was hoping to boost to 23# with alky inj.

[Shane@DBPerformance]

Overruning the stock FPR is only a problem at idle/cruise. Your fuel pressure should be at it's highest and hardest to overrun during high boost. If you really want to run high boost on pump gas, then get a methanol injection kit. Water/Isopropyl alcohol injection is a waste of time.

[Onefast99gsx]

Would love to run high boost on pump :) As for what i run for injection, it's the same stuff the stock car and drag racers use. I just call it alky. I used to mix it 75/25 but i have so much of it and it doesn't use an incredible amount so now i just run straight 100% alky.

[Shane@DBPerformance]

What alky though? If you are using methanol, then you should really get a wideband, because it acts like adding fuel and tuning off of just the DSMLink stuff would be almost about as good as just randomly guessing. Is it virgin methanol you are using? Where are you getting it from? Are you using any upper lube with the methanol? The guys running methanol injection kits are able to run over 30psi on pump gas.

[Onefast99gsx]

Shane- I'm 99% sure it's ethanol, the stuff made from corn. Looks like methanol is made from wood products. I have not been using any kind of upper lubricant. Do you think that ethanol is not nearly as good as methanol? I'm curious to see your answer to that. I got this stuff from a guy that races Late Model stock cars.

Thanks.

[Shane@DBPerformance]

Yea, ethanol is not as good as methanol. But it is not as corrosive either. It is better than normal gasoline. Our gas here in MN, I don't know about WI, already had 10% ethanol in it.

Spraying ethanol is like adding more fuel though also, so your DSMLink A/F ratios will be even farther off, if you spray much of it.