09-24-2010, 02:52 PM
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CC Member
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Join Date: Jul 2007
Location: Detroit Burbs,
MI
Cobra Make, Engine: Former owner of SPF#2632
Posts: 257
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Not Ranked
Hi Tom - was in you shoes last winter with my 402SR. I decided to replace my 770 Street Avenger when I had to pull my intake to replace the gaskets. The 770 was a good carb (after Roush rebuilt it when I experienced a severe stumble right after install). Patrick built the following: 4150 950 HP. Flowed at 830. I was prepped by some of my pals I would regret no choke. I do not as the car starts great. Takes 3 minutes or so where you can let off the gas.
The Good - when the secondaries kick in and at higher RPMs, the car now screams....almost scary. I definitely noticed a power difference (and I am sure failing intake gaskets didnt help any either).
The Bad (and it's not so bad) - did take some initial set up changes (floats, idle mixtures, and idle)...a wideband A/F computer really helps verify when on target. Luckily had one loaned to me. All A/F ratios were dead nuts on out of the box. Idle is a little rougher than I remember...but again this is more of a racing carb. Also, I have a slight bog (actually goes rich..to around 10) when entering a slow right turn (barely noticable on a left turn) from a stop 0or extremely slow speed. A slight touch of the accelerator removes this bog. Not sure if the jet extensions are the cause but so far this has not bothered me. The float adjustment was key in minimizing this versus balancing a stumble upon acceleration (which I do not have).
The Ugly - nothing to report here.
Summary - glad I made the change, good customer service. Would reccommend Pro-Systems with no hesitation. - Eric
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