Opinions on Paxton SN89 supercharger?

[scorp508]

Does anyone have experience with this model? More specifically I am looking for thoughts about the kit by Carroll Supercharging.

Pounds of boost created on a 350?
Pounds of boost created on a 383-396?
Compression Ratio recommended?
Is water injection required?
Can the stock ECM handle it?
Is a 2ndary fuel adder required or can 8 large inj. get it done?

Anything and everything is appreciated. Thanks! :seeya

 

[8388]

If the compression, injectors, and ecm are stock then yes, water injection is necessary, and will work similar to a inter cooler,just not as efficient.


If you run a modified impellor, you could see boost between 6 to 7 lbs. If you run the small pulley, boost may go as high as 10 psi.
The above is for a 350 ci. With a 383 those numbers will fall a bit.

If your going with a Paxton, as I did, One of the most important improvements I've noticed is running cooler. Since the Paxton is self contained the oil just keeps getting hotter and hotter, this alo effects the air temperatures going into the engine. The cooler will help in two areas, help keep the blower cooler which will have a direct efftect on the blowers lifespan, and help keep the air temps down. I run a B&M plate style cooler, and used the old water injection pump, to pump the fluid.

Usually if the engine is mostly stock, the 24 lbs injectors will work with a bit more fuel pressure. If it's modified or a 383 or larger is being used 30 to 36 lbs injectors may be necessary. My combo is far from stock .I'm currently running a Haltech aftermarket ecm. I run 50 lb injectors which are right about 80% duty cycle, meaning more power and bigger injectors will be required. My fuel pump is the Bosh or now known as Accel big pump.

Since the sn 89 or for that matter an sn 2000 like I have will never make tons of boost, running 10 or even 11 to 1 compression is not out of the question. You just have to make sure the fuel requirement are right, and map the timming correctly. This is when a programmable ecm will become necessary.

 

[scorp508]

Thanks a lot. So if one was to go with an intercooler the water injection becomes moot? Is it a total pain to route the plumbing for one with this kit? At what RPM does the unit become inefficient?

*edit*

I should add that I'm thinking of having my original block converted to a splayed 4-bolt while it is out of the car and stuff it full of forged components so I'd be able at that time to lower the CR if I decide to try this out.


There is a kit for sale right now and I am contemplating purchasing it now for down the road. Any idea what the going rate for freshening up the supercharger is?

 

[8388]

I would not recommend running an intercooler with the Paxton. The intercooler will kill most of the boost which is kinda low to begin with. Installation of the kit is not that difficult, but you will have to cut out a bit of the hood, which is a PITA. Once installed the removal of the blower is as easy as removing the alt.

If you have the opportunity go with with some good quality forged pistons. And make sure the top ring is gapped correctly.

 

[scorp508]

Thanks again Mr. Knowledge Bank.

In your opinion if the CR was dropped, appropriate injectors installed and a '165 ECM tuned can the water injection become part of history for a street machine? I really just don't feel like having to deal with filling it up or having it freeze at night during the winter.

Is the '165 completely useless at this point and I should instead be looking at aftermarket boost-aware ECMs? Perhaps do a conversion to the Syclone ECM with a 2-bar MAP sensor.

Sorry for all of the questions, kinda limited on how much time I have to make a decision.

 

[8388]

Lowering the compression ratio and getting the fuel right and you may be able to avoid the water injection. Yes I'm with you on the water injection being a PITA but it does help not only with detonation, but actually a bit in making power. I lost my original
L-98 when I ran out of water one night, but also my type of racing was and is all out top end mph.

You can mix a bit of denatured alcohol to help with the freezing of the water. I used to mix some back when I was running water injection on cold nights.

Going with a 2 bar map sensor and an ecm that can read it is the best.

BTW, not sure yet, but I may decide to sell my Haltech in the near future. I may replace it with an ecm that works with a wide band 02 sensor.

 

[Mad-Mic]

this is what i found at www.superchargersonline.com for pricing.

Dear Valued Customer,

You requested a price quotation for: ProCharger P600B H.O. Supercharger Kit w/2-Core Intercooler for 85-91 Chevy Corvette TPI (8 psi/10 psi/12 psi Polished) [more info]
Part Number: A1GB212-10I
SuperchargersOnline.com*: $3,899.00
List Price: $4596
You Save: $697


Dear Valued Customer,

You requested a price quotation for: ProCharger D-1 H.O. Supercharger Kit w/2-Core Intercooler for 85-91 Chevy Corvette TPI (10+ psi - polished) [more info]
Part Number: A1GB212-D1
SuperchargersOnline.com*: $4,049.00
List Price: $4996
You Save: $947

i think with a fat head gasket and you don't have to shave the heads you can get the compression down to 9:1 and can easily push 10 psi. 12 psi with some deep dishes and shave your heads since your doing a rebuild why not?

and what 8388 said. thats alot of good inside information i never thought of. i know with software you can burn chips but never thought about a dfi setup. good info 8388.

i think i'm gonna go with nitrous for now. i'm gonna get my stock heads done, rebuild the lower end. bearings,wristpins, and forged pistons. wish i made big bucks like the rest of you fella's :gap

 

[Mad-Mic]

thats the only company that sells a kit for TPI cars on that site. so couldn't tell ya about the sn you want to get

 

[scorp508]

i know with software you can burn chips but never thought about a dfi setup. good info 8388.

Yup. I've already got all of my own equipment for burning chips and currently tune my '87 in this fasion. Its fun stuff!

 

[Mad-Mic]

Yup. I've already got all of my own equipment for burning chips and currently tune my '87 in this fasion. Its fun stuff!

yeah i'd like to learn so i can tune my car

 

[tntcorvette]

you know I am running 10:1 compression on a motor that was designed for a 175hp shot of n2o, which I have never ran.

I have been thinking about getting a Carrol SuperCharger with 6 or 7 psi and routing the intake charge from around the supercharger, then parallel with the radiator and then into my TPIS cold air intake. Intercooling with 6 to 7 psi and this setup should not be necessary.

What do you think?