Who is using it? How does the system work and what is needed? Any pics of a setup?

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'91 Formula
383CI Superram, Sportman II's
SLP Cam 214/224 .470/.490
Vortech V1 S-Trim
5-speed
3.42
12.34@117.04, 1.91 60Ft.
on Drag Radials

 

I'm probably the only resident of this site that uses water injection. There are several others that use it at http://www.camaroz28.com on fourth gens.

Water injection is the terminology that's used, but it's actually a mix of distilled water and alcohol. I use a 60/40 mix of water to denatured alcohol.

This mixture is used to cool the intake charge significantly and is injected at 100-psig. This fact in itself greatly reduces/eliminates detonation. The high pressure that's used completely atomizes the water into the airstream. In addition, the alcohol acts similar to a fuel additive, raising octane.

Based on readings I see on my digital air temperature gauges and MAT sensor, I can attest to the effectiveness of water injection. Typically on a full boost run (12-psig), I see the following air temps:

In my custom airbox:
Typically about 10 degrees above ambient.

Between the blower and intercooler:
As high as 190 degrees.

Immediately after the intercooler:
In the 120 - 130 degree range.

The water/alcohol is injected in the intake tract immediately in front of the throttle body.

In the plenum (without H2O):
Around 130 degrees;

In the plenum (with H2O):
About 5 degrees below ambient.

This setup allows me to run full advance (38 degrees) throughout my rpm range with up to 12 pounds of boost. My C.R. is 8.9 to 1. Can you envision how high the air temperature would be that's introduced into the combustion chamber without an intercooler and water injection? Based on the fact that it is now over 190 degrees at the blower discharge, it would be well over 200 degrees in the combustion chamber.

For specific information on water injection, go to http://www.carrollsupercharging.com

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Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
Former Paxton (6-psig) with 50-hp nitrous: 12.043 @ 112.86 mph.
ATI D1SC (10-psig): 12.056 @ 116.62 mph.
All stats are altitude corrected for 3,100 feet using NHRA's Altitude Correction Table.

http://willie.camaro-firebird.org/

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.

[This message has been edited by Willie (edited October 13, 2001).]

 

The Paxton I put on my '87 IROC in 1990 came with water injection. It uses a standard external windshield washer pump and T's into the windshield washer line. A 1.5 lb. pressure switch is T'd into the master cylinder vacuum line on the back of the plenum. When boost exceeds 1.5 psi, the pump squirts washer fluid into the duct just in front of the throttle body. A couple of windshield washer check valves allow washers and injection to work without affecting the other.

 

I'm using the Paxton setup but with one addition.

I have added a second pump in series with the first pump to increase the line pressure at the nozzle.

I use 75% washer fluid (already contains some alcohol) and 25% methanol

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Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro
"Cogito ergo zoom"

• 355 cid
• AFR heads
• Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
• modified SLP runners
• TRW forged pistons/ceramic coated
• fully balanced
• Edelbrock headers/ceramic coated
• SLP cat-back
• Paxton supercharger
• Nitrous Express nitrous oxide

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