Going from 150 > 250 WET
10-08-2005, 07:19 AM
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Going from 150 > 250 WET I've been poking around other folks threads trying to learn a bit...time to start my own here:
So if I decide to jump from 150 to 250 shot I need to:
1- Change fuel pump (LS1) Walboro 255 or equiv
2- Add second stage
3- Change timing
4- (poss) Raise Octane
Question 1: Am I correct so far?
Question 2: What's involved in adding second stage. Is it better to go to a fogger? Are second nozzel okay?
Question 3: Does timing have to be adjusted variably.
Question 4:
So if I decide to jump from 150 to 250 shot I need to:
1- Change fuel pump (LS1) Walboro 255 or equiv
2- Add second stage
3- Change timing
4- (poss) Raise Octane
Question 1: Am I correct so far?
Question 2: What's involved in adding second stage. Is it better to go to a fogger? Are second nozzel okay?
Question 3: Does timing have to be adjusted variably.
Question 4:
10-08-2005, 02:42 PM
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10-09-2005, 07:36 AM
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Originally Posted by Macon
I've been poking around other folks threads trying to learn a bit...time to start my own here:
So if I decide to jump from 150 to 250 shot I need to:
1- Change fuel pump (LS1) Walboro 255 or equiv
2- Add second stage
3- Change timing
4- (poss) Raise Octane
Question 1: Am I correct so far?
Question 2: What's involved in adding second stage. Is it better to go to a fogger? Are second nozzel okay?
Question 3: Does timing have to be adjusted variably.
Question 4:
So if I decide to jump from 150 to 250 shot I need to:
1- Change fuel pump (LS1) Walboro 255 or equiv
2- Add second stage
3- Change timing
4- (poss) Raise Octane
Question 1: Am I correct so far?
Question 2: What's involved in adding second stage. Is it better to go to a fogger? Are second nozzel okay?
Question 3: Does timing have to be adjusted variably.
Question 4:
You will need more than a just a Walbro pump alone. My Walbro is taxed on a 225 shot, I just added a voltage blaster and hotwire kit in hopes it will support a 250 shot, we'll see.
I would do a second dry stage. I would be alittle concerned about fuel distribution issues putting a wet 250 shot through the intake. It can be done but I feel the wet/dry combo with a big shot is just safer than one big wet shot. You would need to upgrade injectors though if you wet wet/dry.
You will absolutly need a major timing adjustment.
You will absolulty not want to be running that 250 shot on pump gas, especially with non forged internals (doesn't leave much room for error). I would stick with a minimium of 100-104.
You will also want to look at replacing your rod bolts, they would probrably be the first to go.
10-10-2005, 12:26 AM
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Originally Posted by GM Muscle
Are you still running a stock bottom end or not? A 250 shot is alot for a stock bottom end and it is somewhat of a gamble.
You will need more than a just a Walbro pump alone. My Walbro is taxed on a 225 shot, I just added a voltage blaster and hotwire kit in hopes it will support a 250 shot, we'll see.
I would do a second dry stage. I would be alittle concerned about fuel distribution issues putting a wet 250 shot through the intake. It can be done but I feel the wet/dry combo with a big shot is just safer than one big wet shot. You would need to upgrade injectors though if you wet wet/dry.
You will absolutly need a major timing adjustment.
You will absolulty not want to be running that 250 shot on pump gas, especially with non forged internals (doesn't leave much room for error). I would stick with a minimium of 100-104.
You will also want to look at replacing your rod bolts, they would probrably be the first to go.
You will need more than a just a Walbro pump alone. My Walbro is taxed on a 225 shot, I just added a voltage blaster and hotwire kit in hopes it will support a 250 shot, we'll see.
I would do a second dry stage. I would be alittle concerned about fuel distribution issues putting a wet 250 shot through the intake. It can be done but I feel the wet/dry combo with a big shot is just safer than one big wet shot. You would need to upgrade injectors though if you wet wet/dry.
You will absolutly need a major timing adjustment.
You will absolulty not want to be running that 250 shot on pump gas, especially with non forged internals (doesn't leave much room for error). I would stick with a minimium of 100-104.
You will also want to look at replacing your rod bolts, they would probrably be the first to go.
