1989irocz1

I just fully installed my paxton sn89 supercharger today. I went to test drive it and I didn't feel that much of a difference. What RPM does the supercharger kick in? Do I have to have the alcohol injection installed (tested without it)?

Tony89GTA

How much boost is it making? Probably wont feel much tell past 4000rpm.

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89 T-Top GTA 5.7L T-56
ATI procharger D1sc, AS&M SS runners, accel base, 58mm TB, 42Ibs injectors, full exhaust, McLeod Street twin, Moser ford 9" with 3.70, 18" Boyd Smoothie II wheels 8"/10", DIY prom with code59.

Items to be installed: AFR 195 eliminator heads, zz9 cam, Stainless works LT 1 3/4 headers, Mufflex 4" catback

http://www.cardomain.com/ride/2480939

1989irocz1

It should make 5-6 psi. That 4000 rpm makes sense, when I was revving the motor the silicon piece holding the tube to the throttle body popped off when I hit 4000. I have to put on a tighter clamp tomorrow and test it again.

Tony89GTA

Get a t-bolt clamp for that if you can.

XxCoLTxX

Is this a basically stock 89 350? reason im asking is,Im thinking of buying a supercharger,and If you didnt feel a major diference I might just save the money.

1989irocz1

This is a almost stock 305. Th only mods before the supercharger were a 350 corvette chip is in the prom and I had a gutted out airbox. Since you have a 350 you will definitely feel a difference. MY little 305 noticeably pulls a little harder, but I think I had higher expectations. I need a chip tuned to the supercharger and an airfoil, then I should free up a lot more horsepower. Right now I am afraid to go above 5000 rpm because I don't have alcohol injection or my intercooler hooked up.

mike1986fyrbird

How is it adding more fuel? fmu?

1989irocz1

This old paxton SN 89 kit didn't require a separate fmu unit. This kit was only meant for 5 psi.

1989irocz1

Here is the verdict on that paxton sn89.it kicks in at 2000 rpm. The catch is that I only feel it pulling big when the supercharger is cool. When The engine temp goes up (supercharger is burning hot), it seems like the supercharger is weak. My solution is to hook up my intercooler ( I am waiting on 2 pieces of tubing to complete the conection). yea, I am running an intercooler with a sn paxton supercharger. It was either that or water/alcohol injection.

anesthes

paxton is poop. Buy a vortech or procharger and you'll feel it.

-- Joe

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'87 Corvette - Singleplane, TFS heads, 10:1, Crane 109831 cam, steel crank, scat h-beams, true dual exhaust, 91-96 body conversion, ZF6 Trans, Powerdyne Supercharger, Grand Sport rims.

Mark A 91Formula

Dammit, the SN89 is poop, not paxton as a whole I like my paxton thank you very much!

__________________
91 Formula
305 TPI-now being pulled
T-56 tranny
Novi 2000
Borla Cat-Back
Spohn Torque Arm
Eibach Pro lines and Tokico Illuminas all around
LS1 rear brakes
Zeitronix WBO2
7730 running $58 code

tpi user

paxtons do run really really hot i used to have one on my iroc 350 tpi years ago.try intercooling it that will really help,supercharger will still run hot but the boosted air will be alot cooler. all the nonintercooled centrifigul superchargers are poop today.35% increase is about all your gonna get on 5-6 psi with no cooler. when i had it i felt it was a big waste of time an money.

1989irocz1

Well, all together I paid around $1000 for the supercharger and intercooler kit. $150 for the cost of installing it. After I get all the vitals hooked up right, I will pay someone (professional) to burn me a chip. I had the car backfiring when I was revving it to 4000 last night, so I think the timing needs to be adjusted now. I still have not pushed the motor past 4500 rpm because I get chills from hearing other people's experiences with the sn series paxtons after 5000 rpm. I read from other people that the bearing failures happen after 4850rpm (max rpm for the supercharger). I want to get the 3.5 in pulley ( which increases the max supercharger rpm to reduce bearing failure) but I have the 3 rib v belt kit which makes that pulley impossible to find.

1989irocz1

I would but the old paxtons are the best for us who are jobless

tpi user

its not that the paxtons are total junk, im not bashin any1 really. they do have some limitations more than others. but the main problem is heat they all run hot . vortech and the others are really no better if they are not intercooled either. hook that cooler up you will see a big difference. a stock chip will probably be ok since they keep timing in check. aftermarket chips like hypertech an jet are a no no as they advance the timing.you could get a custom one but may not even be needed at 5-7 psi.

tpi user

plus you got a great deal.

Tony89GTA

People have been running superchargers for years without a intercooler with good results, I don't see it doing much on a stock car at 6psi.

BTW you really should look into getting a FMU.

1989irocz1

I am using the intercooler as an alternative to the water/alcohol injection found on most non intercooled superchargers that see good results. There are some tricks to making the intercooler a much better choice. I'll look into the FMU once I have the whole system working properly.

antoine

they make a fluid cooler for the paxton its like 350 dollars

1989irocz1

The POS SN 89 I bought just spun its bearings today. I've never went past 4500 rpm on it and it spun. I bought a refresh kit when I purchased the supercharger. I am going to "refresh" it then sell it for what I bought it for. I want more power (8-10 psi) so I am looking at a custom novi 2000 build.

XxCoLTxX

how much did you buy it for?

1989irocz1

$800 with the bracket, pulleys, paxtrac fluid, spare belts. I had to buy all the bolts and spacers from the hardware store.

XxCoLTxX

how many mile did you put on this before it broke?,any knowledge of how many miles it hasdbefore you got it?

mesterz2889

what the french toast what a gyp

Batass

How so? Water/alky injection cools better than an intercooler, it also doesnt steal any pressure. Its much easier to setup and generally cheaper.

1989irocz1

Imo I feel that the water/alcohol injection is good for drag racing. I am setting up my car for pro touring. So I would like to take it to a raceway when done. I think I am done messing with the paxton sn supercharger. I'll be running more boost with whatever supercharger project I'll be moving onto.

camarodude87

I have a paxton on im pushing around 9 1/2 lbs, I had to throw on a procharger bov due to i kept blowing out my gasket on my throttle body, Im loving my paxton. its not intercooled, im thinking I might go that route
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I went a good 2 yrs on mine, but then again i got it replaced then 4 days later due the guy that installed them did a bad job and forgot to place them in correctly, and the shaft was loose. but its been a good month now with the charger back and im loving it

1989irocz1

Are you running a paxton vr4?