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Old 09-03-2010, 01:44 PM   #1
03z06killa
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Default should i buy a vaccum pump or not?

I have a sbf 331 stroker nitrous car going to hit it with 200-250 never have used a vaccum pump in the past my friend told me i should get one but i dont know anything about them. if i do need one wich should i get 3vane or 4 if anyone could help i would apreciate it.
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Old 09-03-2010, 02:14 PM   #2
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Default Re: should i buy a vaccum pump or not?

yes, 3 vane moroso will be fine
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Old 09-03-2010, 02:31 PM   #3
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Default Re: should i buy a vaccum pump or not?

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Originally Posted by seabass459d View Post
yes, 3 vane moroso will be fine
this would be best but you can also use header evac system
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Old 09-03-2010, 02:56 PM   #4
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Default Re: should i buy a vaccum pump or not?

Solved my oil leaking problem. I'd assume it added a little power also.

Moroso 4-vane here.
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Old 09-03-2010, 03:08 PM   #5
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Default Re: should i buy a vaccum pump or not?

If you have money to spend then a 3 vain.. You could always do like 91 stangnos mentioned.. I good evac system will work just fine with your combo..
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Old 09-04-2010, 12:08 AM   #6
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Default Re: should i buy a vaccum pump or not?

4 vane pump and record the pan vacuum to detech deadanation in the engine. If you are useing a 7531 you can hook up a map sensor to it and record off that.
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Old 09-04-2010, 12:10 AM   #7
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Default Re: should i buy a vaccum pump or not?

A vacuum pump is one of the best investments you can make on a nitrous motor, over time they usually pay for themselves by allowing you to see detonation and keeping the cylinders dry. I would also go ahead and get a 4 vane if you can that way you will always have room to grow.
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Old 09-04-2010, 08:53 PM   #8
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Default Re: should i buy a vaccum pump or not?

Besides all the benefits already mentioned, you should pick up at least 25hp. That's what I saw on one of the engines I had built when we had it on the dyno.
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Old 09-06-2010, 09:35 AM   #9
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Default Re: should i buy a vaccum pump or not?

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Originally Posted by spray power View Post
4 vane pump and record the pan vacuum to detech deadanation in the engine. If you are useing a 7531 you can hook up a map sensor to it and record off that.
Does anyone have a part number for the proper map sensor to use with a 7531 box?
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Old 09-06-2010, 07:05 PM   #10
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Default Re: should i buy a vaccum pump or not?

I believe it's the part number 2311 for the single bar sensor. They have an online catalog you can use.
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Old 09-06-2010, 09:54 PM   #11
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Default Re: should i buy a vaccum pump or not?

Summit says that part isn't available. I'll do some searchong and see what I can find in a single bar 0-5v sensor.

Thanks for the info.
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Old 09-06-2010, 10:12 PM   #12
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Default Re: should i buy a vaccum pump or not?

There is no reason you shouldn't be able to use an everyday GM 1 bar sensor. They are readily available from any auto parts store. GM used the same sensor on miilions of vehicles. Look at a 1991 S-10 truck for an example.

I would put a vacuum pump on any nitrous engine. Not cheap, but it's certainly worth it. I use the Star Sportsman stuff myself. They have one of the best drive mandrel setups out there.

The worst part of a vacuum pump (next to the price) is mounting it and making it work with any other accessories you already have, Alternator, Power Steering pump, Water pump...........
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Old 09-07-2010, 03:05 AM   #13
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Default Re: should i buy a vaccum pump or not?

It shows up online http://www.summitracing.com/parts/MSD-2311

I believe it's the standard GM sensor anyway that you can get pretty much anywhere.
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Old 09-07-2010, 09:19 AM   #14
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Default Re: should i buy a vaccum pump or not?

Use the MSD map sensor and same you some troble. MSD makes the plug in a little different than the regular GM map sensors and you will spend some time trying to get it to plug in the MSD 3 pin harness. Yes the MSD is a little more but sames time which is money.
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Old 09-07-2010, 11:26 AM   #15
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Default Re: should i buy a vaccum pump or not?

Quote:
Originally Posted by spray power View Post
4 vane pump and record the pan vacuum to detech deadanation in the engine. If you are useing a 7531 you can hook up a map sensor to it and record off that.
Just to be clear, detonation can be recorded by monitoring pan vacuum? I assume this is detectable to a logger like racepak. What do you see when detonation occurs? Is it real obvious, or are there subtle changes in vacuum? Is this useful in n/a setups as well?
Also, I am looking for a racepak o2 single channel. It seems they are out of stock for a couple of more weeks.

Last edited by coolbeans; 09-07-2010 at 11:27 AM.
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