Not picking up like it should

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Jul 21, 2013 | 09:07 PM

#21

Ls_Notch

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From: Pittsburg, Kansas

It's the stage 6 plate and I'm just going off what nitrous express says on the jet size and fuel pressure. They recommend 8 on the low side for the fuel pressure, it's the lightning solenoids

Jul 22, 2013 | 06:51 AM

#22

Dynospeed

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If you have never read the plugs I would take a step back to 150 and start reading the plugs. I'm sure you were rich on the 150 but now you are dead rich. Start taking notes of weather conditions so you know what to change in the future when the weather changes. Also take at least 4 more degrees out than you had while you are leaning it out.

Jul 22, 2013 | 09:50 AM

#23

Nitro Dave's Nitrous Outlet

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From: Waco, TX

Quote:

Originally Posted by Ls_Notch

Put the 250 jets In my nitrous express Gemini 2 plate and didn't quite work out how I was expecting. The car went 6.09@111 on the 150 shot and the best I could get out of the 250 was 6.10@114 with a little worse 60, 1.39 to the 1.37 before. Had 10 deg out on the 250 and 8 on the 150. The da was around 3400 last night but I figured it would still pick up with 100 more horse. I'm running a 4am feed line that came with the kit, could that be restricting me that much? Bottle pressure was good and full bottles. Something isn't adding up. It was very humid and couldn't see a timing mark on the strap but I was cautious to put too much back in with my stock bottom end. The car was running clean too and felt strong all the way through the traps, any ideas?

Due to the design of that plate jetting can seem a little screwy when you compare it to other set ups out there.

From my experience a 16 ft main feed line starts to show flow restriction around the 250 mark, so upgrading to a 6 an main feed line would be a good idea.

What is the compression ratio of your engine?
What fuel are you running?
What heads?

Did you happen to pull the plug at all?
Do you have a wideband on the car?
What do you call good bottle pressure?

Dave

Jul 22, 2013 | 12:32 PM

#24

Ls_Notch

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From: Pittsburg, Kansas

It's a stock bottom end lq9 with prc stage 3 243s so prob 10.5-11 compression
Running 110 race gas

I checked all plugs none had timing marks on the band and they were somewhat fat

I do have a wideband but I have to get the software working to data log it since I just got a new lap top and don't have the install disk anymore

And bottle pressure was all right around 950

Jul 22, 2013 | 02:04 PM

#25

87silverbullet

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From: Slidell,LA

Quote:

Originally Posted by Ls_Notch

I wouldn't worry about your timing right now but make sure you are pulling enough. You can add it back later.

Can you post up some pics of your plugs? That way we can look at them and get a better assessment of what's going on.

Jul 22, 2013 | 08:14 PM

#26

Ls_Notch

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From: Pittsburg, Kansas

I didn't take any pics with them out and I put them back in to load the car so I doubt they would be off

Jul 23, 2013 | 12:36 AM

#27

Killer5.3

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From: Ms

You probably have more than 10.5:1 compression. The lq9 is 10:1 stock with 72 cc heads and you have at least 64cc chambers now. Depending on what chamber cc is and head gasket it could be higher.