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Old 08-27-2005, 06:18 PM   #1
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Default How Much Nitrous...?

I've posted a few times before about running nitrous on a SER1 L67, but I realized most people haven't really had any experience with these motors. Today I hooked up a 50hp wet shot to my car with the stock pulley on and it responded quite nicely. I'd like to step up the shot to a 75, but I'm not really sure what the motor is capable of handling. Injectors aren't an issue since I'm running a wet kit. I'd like to know what the fuel pump is capable of supporting horsepower wise, although I don't have to worry about running lean since I'm running a fuel pressure safety switch.

I remember there was another forum member with a SER1 L67 in a fiero and was running a 100 shot with a smaller pulley. I probably won't go that extreme. I'm thinking of either running a 2.1" Pulley with a 50 shot, or running a 75 shot on the stock pulley.

Any info/suggestions are welcome.
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Old 08-27-2005, 06:24 PM   #2
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75 shot is the most anyone has run here, and few have. We try to stay away from nitrous.

I suspect you'll have major problems with KR, even with the nitrous if you step to a 2.1" pulley.

The stock Series 1 L67 fuel pump in GOOD condition (new) is capable (believe it or not) of supporting more than the Series 2 L67 fuel pump. Ours is good for 400hp.
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Old 08-28-2005, 01:33 PM   #3
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Welp at least the fuel pump should be good for what I'm doing then. I ended up running a 2.1 pulley and a 50 shot last night. The outside temp was 62 degrees and I raced my buddies supercoupe for comparison. He has intake, exhaust, gears, and 10% pulley. I pulled about a car from the stop and stayed there. Then we went from a roll and he pulled about a car and then stayed there. I was hoping to do a little better than that, so KR probably is an issue here. I'll swap back to the stock pulley and put a 75 shot on it and see if it performs any better that way.
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Old 08-29-2005, 12:14 AM   #4
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Quote:
Originally Posted by willwren
75 shot is the most anyone has run here, and few have. We try to stay away from nitrous.

I suspect you'll have major problems with KR, even with the nitrous if you step to a 2.1" pulley.

The stock Series 1 L67 fuel pump in GOOD condition (new) is capable (believe it or not) of supporting more than the Series 2 L67 fuel pump. Ours is good for 400hp.

I have been running 100 shot for almost a year now. I am running walbro 255lph fuel pump it handles the 100 shot great , I dont care much about the series1 and am swapping out to a series 2 shortly so I will be trying a 125 shot very soon, and continue to go up from there. motor has 75k miles hate to toast a good motor but we will see how much it can handle with stick injectors etc.
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Old 08-29-2005, 12:32 AM   #5
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Quote:
Originally Posted by sc3800fiero
Quote:
Originally Posted by willwren
75 shot is the most anyone has run here, and few have. We try to stay away from nitrous.

I suspect you'll have major problems with KR, even with the nitrous if you step to a 2.1" pulley.

The stock Series 1 L67 fuel pump in GOOD condition (new) is capable (believe it or not) of supporting more than the Series 2 L67 fuel pump. Ours is good for 400hp.

I have been running 100 shot for almost a year now. I am running walbro 255lph fuel pump it handles the 100 shot great , I dont care much about the series1 and am swapping out to a series 2 shortly so I will be trying a 125 shot very soon, and continue to go up from there. motor has 75k miles hate to toast a good motor but we will see how much it can handle with stick injectors etc.
What size pulley are you running with what year supercharger? Also, are you using a wet or dry kit? Could you also tell me about the spark plugs you use? I'm running Autolite 104s right now and had to gap all the way down to .028 before it would stop blowing out the spark when I used the nitrous. Also, do you have any sort of tuning done to the PCM? Thanks
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Old 08-31-2005, 12:20 AM   #6
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i am running a wet kit with tr55'* gapped @.45. I have a 94 sc and tb with a 2.5" pulley stock pcm. only change i have made is the upgraded fuel pump.
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