Boost Questions regarding a MPI Stage 1 Nytro at Sea Level

[snowmaaan]

Hey guys, I am trying to determine what a decent pump gas setup for sea level with a Nytro XTX would consist of. I have an MPI Stage 1 kit with a BOV, A/F gauge and stock engine. I would like to spin it around 8800rpm and I want to RUN PUMP GAS. Again, this is a trail sled.

I have not had great luck dealing with MPI directly (dont even get me started!!) so I thought I start here...

I believe the following to be true;
28 bottom/ 27 top = 6lbs
29 bottom/ 27 top = 8.5 lbs
28 bottom/ 26 top = 3.5lbs

Can anyone verify if my data is correct. Sadly enough I have more than enough pulleys to run all of these configurations and then some.

Thanks in advance!

 

[pro116]

On my wifes sled with 28 top and 27 bottom it runs 5.5lbs of boost at sea level.

Run pump gas no pronlem with safe afr readings.
I have the upgraded fuel pump though an cold air intake.The intake adds about a lb of boost.

 

[snowmaaan]

Cool! Thanks for the insight. I have since spoken with MPI and I believe I will run a 28 bottom and 27 top...should be ok for about 6-7lbs at 8800 rpm.

Your wife must be a fun gal! Yikes!!

 

[Ratpack]

I ran 7 lbs for two years on pump gas. Our premium is 93 octane.

 

[snowmaaan]

What pulleys provided 7lbs at sea level?

 

[MOUNTY]

I run 27 top, 29 bottom and I have a consistant 6-7lbs of boost.

 

[Ratpack]

On the RX1 24/24 made 7 lbs.

 

[MOUNTY]

Correct me if i'm wrong but I think snowmaan is asking for Nytro specs.

 

[snowmaaan]

Thanks! Interesting that your 29 bottom / 27 top made 6-7lbs. Do you know what RPM this was at?

I was told by MPI that a 28 bottom / 27 top would make 7lbs at 8800rpms. I really need a boost gauge!!

Thanks again!!