Serial Number on your Novi2k Head Unit

**allen** · 06-04-2003, 12:10 AM

the old ones from what i know had a 3.54 step up and the newer ones have a 3.50 i need to know what serial numbers match the 3.54

**allen** · 06-04-2003, 12:13 AM

the old novis had a 3.54 step up and the new ones have 3.50 i need to know what serial numbers match the 3.54

**Hustler** · 06-04-2003, 12:13 AM

I've never heard of that, but it wouldn't be the first time I've been stumped :P Who did you hear that from?

**allen** · 06-04-2003, 12:18 AM

nmra tech inspection couple guys had a 3.54 and some of us had 3.50 the old novis had 3.54 was told that by vortec race and media relation manager Ricky Best

**Hustler** · 06-04-2003, 12:24 AM

News to me. Its hard to tell, but I'd guess they might have started with that step up ratio in the 07xxx series.

**allen** · 06-09-2003, 10:57 PM

i think you need to look into your info but i think that you have your numbers wrong with the owners granatille was the 05000

**Hustler** · 06-10-2003, 11:03 AM

I believe you are correct, If Ian sees this he can change the voting options.

**90lxstang** · 07-10-2003, 08:44 AM

hey guys, i am new here and would appreciate any info you could give me. i just bought a used 2000, the s/n is 05057. from the poll it appears to be one of the original units. is this a good or bad thing? i am also trying to determine approx how much boost this is currently setup for. the blower pulley is 3.25" and the crank is 7", i think, i dont have it with me right now. i am replacing my older sn92 on my 351 with this baby, and i would like to see around 12psi. let me know what you think

**Saleen91** · 07-10-2003, 09:02 AM

Originally posted by 90lxstang
hey guys, i am new here and would appreciate any info you could give me. i just bought a used 2000, the s/n is 05057. from the poll it appears to be one of the original units. is this a good or bad thing? i am also trying to determine approx how much boost this is currently setup for. the blower pulley is 3.25" and the crank is 7", i think, i dont have it with me right now. i am replacing my older sn92 on my 351 with this baby, and i would like to see around 12psi. let me know what you think

I've got one of the older units and other than some belt alignment issues I haven't had a problem with it. I bought mine used off of ebay and it was missing some parts that led to my belt alignment problems.

The amount of boost you'll see will depend on how free flowing your heads and exhaust are. Boost is just a measurement of airflow restriction. I can tell you that with that combo your impellar would be about 45750rpm at 6000 engine RPM. Just to give you a comparison, the stock pulley setup of 7" & 3.5" would be at 42480rpm @ 6000rpm. The stock pulleys are rated at around 10# on a stock 302 setup. So I would guess the pulley combo you have would be for 12-14# on a stock 302. Granted you're trying to fill up a 351, which can hold a lot more air, and then factor in how well your heads flow and what kind of exhaust you have and you COULD only see as much as 8# of boost at 6000rpm. The only way to know is to wait and see.

The trick is to try and reach maximum impellar speed at your shift point. The Novi's "unofficial" max impellar speed is 55,000RPM. The formula to use for a Novi is:

((crank pulley dia / blower pulley dia) * engine rpm) * blower ratio = impellar speed

The Novi 2k's blower ratio (aka step up ratio) is 3.54. For a comparison, a Vortech V-1 (s-trim) is 3.45.

EDIT: Remember, if you're running a ribbed belt (not cogged) that this forumla does NOT take into account belt slippage. So no matter what number you come up with, the blower will be spinning a little bit slower.

**superpro** · 07-31-2003, 10:32 PM

5591

**jonnyk** · 10-18-2003, 10:40 AM

07500 shipped Oct. 9/'03.

**Snorman** · 10-19-2003, 12:18 AM

07498 received October 15th, shipped October 10th.
S.

**ssj50driver** · 11-12-2003, 05:49 PM

i hope my unit is new enough!!!!
SN/06906
-troy

ps. in any case it looks purty!!!!

**RSNovi** · 11-13-2003, 10:32 AM

I am also curious to what serial numbers have the 3.54 step up ratio. I was one of the racers that was disqualified in GA for having a blower with a less then legal step up ratio.

The difference isn't much, but I figured I could be giving up close to a pound at 8k rpm.