Single Turbo RX-7's Questions about all aspects of single turbo setups.

One for the experts Part 2 (pics)

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Old Nov 8, 2005 | 04:01 PM
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One for the experts Part 2 (pics)

Here is my set up. 16 psi

I have a hybrid Turbo, Saab 9000 intercooler it is installed in front of the radiator. Im running water injection. Microtech lt8 Greddy Power extreme. Innovate wideband. I have air temp guage on both sides of the intercooler.

OK now for the trickey part I have a cool can, alot of drag racers use these to cool fuel to enhance atomazation, I.m not doing this. I have a coil of tubing in my cool can that cools my water before water injection. Here is the part that I expect to be flamed for. My fuel goes through the rail as normal (Walboro) before it is returned to the tank it goes to the cool can, from there it goes to my (Fuel to air intercooler) almost like a PWR H2o I/C then it is returned to the tank. I wanted to cool down the initial charge before the air intercooler. Last week during a test run after several boost runs I was seeing temps about 3 degrees above ambiant. (72) The Turbo side was hitting 145 F before the fuel I/C.

I will be getting Steve Kan tuned on Nov 18th. Steve feel free to reply I hope to turn the boost up (as long as Steve approves)

Ok post away experts
Attached Thumbnails One for the experts Part 2 (pics)-side-view.jpg   One for the experts Part 2 (pics)-h2o-ic.jpg   One for the experts Part 2 (pics)-inter-cooled.jpg  
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Old Nov 8, 2005 | 04:58 PM
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n/m, i'll reply later
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Old Nov 8, 2005 | 05:01 PM
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Ok Steve now I'm worried! PM if you want.

Johny
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Old Nov 9, 2005 | 06:10 AM
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WOW no replies I think everyone is waiting on you Steve. Ok guys Tell me what you think
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Old Nov 9, 2005 | 08:40 AM
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cool
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Old Nov 9, 2005 | 12:16 PM
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Interesting set up for sure.

The gut reaction is ACK!

But then you think about it, the fuel to air intercooler set up looks to be as safe as a fuel rail and in a safer location as it is not above the hot exhaust and if there is a rupture in the core it dumps into the intake post turbo. Still, it is another point of failure for fire. (as additional injectors would be).

I am interested in the hybrid dual stage intercooling; do you have any info from the liquid/air IC manufacturer on flow rate/pressure drop of their units?

That is the only disadvantage I see; you are increasing the pressure drop, though the temp drops could definitely be worth it.

How about a reflective heat barrier (aluminized fiberglass tape/matt) to keep the cold stuff cold in the ice box right by the turbo?

Last edited by BLUE TII; Nov 9, 2005 at 12:18 PM.
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Old Nov 9, 2005 | 04:48 PM
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LOL...nothing to worry, just that it was a little confusing to understand so I figured I would reply back at a later time. Here's what I gather from what you said.

Cool can currently hooked up for the fuel system,

now, you want to uninstall the cool can and use it for water injection (where the nozzles were installed before the I/C).

I personally would not install it before the I/C.

The problem I see is that by spraying water before the I/C, you may potentially collect a larger amount of water at the bottom of the I/C (runners, core, etc..) which could be contaminated over time (rust, etc...). I don't think spraying cooler water before the I/C is necessary, since the amount of water needed to cool down the amount of air going in is insignificant. I think your idea is good (trying to cool down intake charge to help the turbo work less harder but I would be more worry about contamination/buildup then anything else.







Originally Posted by Johny zoom
Ok Steve now I'm worried! PM if you want.

Johny
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Old Nov 9, 2005 | 05:09 PM
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Sorry for the confusion. Water injection is after the I/C. coolingmist system installed as recomended.but... I have a coil inside the cool can thet the hose runs through. The cool can serves as a heat exchanger, cools the water I'm injecting. Then I use the cool can to cool fuel but I send it through a (Water to air type intercooler) my homade deal. It is installed before the air to air intercooler to drop temps coming off the turbo.

Steve you'll be seeing it in 2 weeks

And I'm using steel braided lines, I wasn't happy with Earls so I had some high pressure hoses made
Johny

Last edited by Johny zoom; Nov 9, 2005 at 05:12 PM.
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Old Nov 9, 2005 | 05:11 PM
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That is not what I got from it...

From what I gathered, not only is the cool can cooling his water before it is injected it is ALSO cooling fuel that is being used to cool the primary liquid to air intercooler positioned just before his secondary air to air intercooler.

Right?

edit- doh, he beat me to response
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Old Nov 9, 2005 | 05:14 PM
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We have a winner!^^^^

Last edited by Johny zoom; Nov 9, 2005 at 05:22 PM.
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Old Nov 10, 2005 | 12:32 AM
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It strikes me that if intake coolness is what you are after, why not refrigerate the fuel and water, so when both are injected, they are far below zero? Or use dry ice in your cool can. Of course, you would have to add some methanol to the mix to keep your water from freezing. Or just use straight methanol, which has huge latent heat and, if cooled way down, would cool down the intake charge quite well. But, then you have to make sure you have enough air to burn the extra fuel provided by the methanol.

Why not just put a big fat intercooler on it? Less complicated. Cold fuel does not atomize as easily as warm fuel.
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Old Nov 10, 2005 | 06:30 AM
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Its still in the expermental stages. I've thought about the dry ice and yhe refrigeration. Most of the time you add a big fat Intercooler, you have a problem with the car overheating, and then you have to wait for the I/C to fiil with air, (more Lag). There are less complicated ways, but then again there are less complicated cars also. You're right on the fuel. it atmoizes slower.

Johny
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