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Old 05-18-2011, 10:26 PM   #1
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Default Review of the Arizona Speed Marineís twin blade 58MM throttle valve.

Review of the Arizona Speed Marineís twin blade 58MM throttle valve.

I recently decided to install a new throttle valve on the Big Block Ram Jet in my 57 Chevy,

Why did I do this, for a couple of reasonís, First I found out the OEM throttle body that was on the big block ramjet setup I had was only 600 or so CFM, that was originally designed for a 305 TPI engine, Plus I was having problems with it, due to a sticking throttle valve, leaking gaskets etc.

So since I needed to repair it, I decided to upgrade to the latest and the best Throttle valve I could find, in my opinion, for a fair price.
Since the GM Ramjet system is based on the system designed by ASM, I figured they were the experts in the field.

After doing a lot of research I decided to go with the 1050 CFM 58MM Twin Blade Throttle Body that ASM sells.

Installing the new throttle body was a snap only took a couple minutes; Bolts directly in place of the old throttle body, Uses the same sensors etc.
The new throttle body is machined out of billet aluminum and has dual springs on the throttle lever, so I no longer needed the extra return spring I was using on the old valve.

The car started right up, I did do a few adjustments to the MEFI 3 Computer to fine tune the engine for the additional air fuel ratio etc.
I took it for a drive and the throttle response was fast and responsive. It felt like when I had the 2 four barrel carbs on my big block but with a lot more power.

Cruising down the road it ran smooth and was very responsive at all speeds.

I havenít dino tested it, but they say that you should get an extra 50 horse power just from the new throttle body upgrade, I donít know how many HP increase I got, but you hit the gas and it throws you in the back of the seat like a pilot taking off with a Jet,

I am very satisfied and pleased with ASM's twin blade 58MM throttle valve and would highly recommend it to anyone.

So let all those ricers use the bottle to make power we do it the old fashioned way, Ram Jet.

Otis



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Old 05-18-2011, 10:33 PM   #2
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Otis , I'm glad to see you are getting it sorted out. glad to see that the throttle body paid off. are you getting more comfortable with the mefi-burn? let me know , John
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Old 05-18-2011, 10:39 PM   #3
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Yes a lot more comfortable, I got to pick up the 57 tomorrow, I just had the transmission rebuilt , for heavier duty performance hope it holds up behind the ramjet.

otis :
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Old 05-18-2011, 11:19 PM   #4
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I am using a similar dual 58mm Holley throttle body on my Ramjet 502 for the same reason. The "stock" TPI dual 48mm throttle body is only 635 CFM, which seems really stupid for a 502. I also went to 42 lb/hr injectors, but that's not necessary if you have enough injector already. I didn't have any so I bought the 42's instead of the stock RJ502 29s???

I'll be really interested to see if you got more horsepower. Since I believe the 48mm TB chokes the bigger engines above about 4500 RPM you should be able to maintain your torque to higher RPMs, which means more peak HP.

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