Anyone Ever Bridgeport a GSL-SE motor ??
10-06-08, 02:13 AM
#26
Rotary Enthusiast
Join Date: Aug 2001
Location: Memphis, TN - wishin' i was back in Ft Worth
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A bridgeport and peripheral port are not streetable. They never have been. This doesn't mean people haven't physically done it. That doesn't make them streetable. That makes their owners tolerant. There's a difference. If you like loud exhausts, poor gas mileage, and jerkiness at part throttle such as cruising, go for it!
How many people here that drive a bridge or peripheral port on the street have actually changed their transmissions to closer ratio units to take advantage of the narrower, higher powerband of those ports? Anyone using a stock transmission with anything more than a streetport is wasting power!
How many people here that drive a bridge or peripheral port on the street have actually changed their transmissions to closer ratio units to take advantage of the narrower, higher powerband of those ports? Anyone using a stock transmission with anything more than a streetport is wasting power!
i worked at domino's and delivered pizzas with a peripheral port 13B. it had the stock transmission in it and i didnt feel the need for the $10,000 close ratio adjustable gearbox from racing beat. i was on the street, i didnt have the time in order to change the gear ratios to meet the needs of how many turns i was gonna make on each pizza delivery like racers do for maximizing the straight-a-ways and corner entrance and exit speeds for differing racetrack configurations. every route was different, but i managed.
and the good thing about peripheral ports is that they have plenty of power to waste! and the 4.88s helped out, too
10-06-08, 09:04 AM
#27
Not to dispute your years of tried and tested experience, but one thing of interest that I found about my 1/2sp-1/2bp is carburation can make all the difference in the world. I started out with a 2 barrel Mikuni and it was a pita to drive on the street. Couldn't cruise below 3k without the herky jerky, sometimes had to use 4th gear on the highway, power band began at 4-1/2k, took off like a bat at 5k.
Then I installed a set of RE dual DCD carbs. Made all the difference in the world. During most driving the secondaries are closed off due to the way the carbs are designed. In essence, driving on the primaries is the same as driving an sp, until the secondaries open up. I have my idle set around 1500-1600 rpm, I can turn it down to 800 and it will still idle, but it's quite lopey. I can also now cruise at 1500 rpm, smoothly and the transition when the secondaries open up is quite smooth. Something I could never tune into the 2 barrel Mikuni.
I was pleasantly surprised with the difference between the 2 and 4 barrel carbs. Fuel mileage is reasonable too, I can live with 23-24 mpg on the highway, but I have to be gentle with the throttle. Opening up all 4 barrels can suck quite a bit of fuel. My only regret is that I didn't do the high rpm mods to make use of the rest of the untapped power above 8k.
Then I installed a set of RE dual DCD carbs. Made all the difference in the world. During most driving the secondaries are closed off due to the way the carbs are designed. In essence, driving on the primaries is the same as driving an sp, until the secondaries open up. I have my idle set around 1500-1600 rpm, I can turn it down to 800 and it will still idle, but it's quite lopey. I can also now cruise at 1500 rpm, smoothly and the transition when the secondaries open up is quite smooth. Something I could never tune into the 2 barrel Mikuni.
I was pleasantly surprised with the difference between the 2 and 4 barrel carbs. Fuel mileage is reasonable too, I can live with 23-24 mpg on the highway, but I have to be gentle with the throttle. Opening up all 4 barrels can suck quite a bit of fuel. My only regret is that I didn't do the high rpm mods to make use of the rest of the untapped power above 8k.
10-06-08, 09:09 AM
#28
i worked at domino's and delivered pizzas with a peripheral port 13B. it had the stock transmission in it and i didnt feel the need for the $10,000 close ratio adjustable gearbox from racing beat. i was on the street, i didnt have the time in order to change the gear ratios to meet the needs of how many turns i was gonna make on each pizza delivery like racers do for maximizing the straight-a-ways and corner entrance and exit speeds for differing racetrack configurations. every route was different, but i managed.
and the good thing about peripheral ports is that they have plenty of power to waste! and the 4.88s helped out, too
and the good thing about peripheral ports is that they have plenty of power to waste! and the 4.88s helped out, too
I have also always thought that anything more than a 4.10:1 rear end was a waste of time on the street and have even pushed the RX-8 people to dump their crappy 4.44:1 (now an even worse 4.77:1) rear end in favor of something that would be much better to drive on the street.
More is not always better. More rear end gearing and more porting isn't always better. This goes back to my Cessna analogy. Just because it "can" be done and because someone is willing to put up with it doesn't make it "streetable".
It is up to everyone to do what they want with their own cars though regardless of other's opinions. I'm sure mine doesn't matter to you and that's perfectly fine. As long as you are happy with your car, that's all that matters.
In the end it is ultimately cheaper and easier to just bolt a turbo on a stock motor than it is to get more agressive porting styles to work well. You wouldn't even need an intercooler to match the power levels!
