CHP 347 or Boosted stock motor?

[final5-0]

How would you rate driveability now compared to stock?

It is like stock except for cam lope at idle

Also, what about long Interstate trips?

Wifee and me have been on several 2 to 3 hour trips with no probs of any kind.

We cruised at about 75mph and got a bit over 19 mpg.

On one of the trips, we had been cruising most of the trip at about 80 mph when all of a sudden, this bothersome Camaro pulled up along side of us. I quickly took the opportunity to slip it in 4th and show him how beautiful the horizontal tail lights are on a 94-95 Stang

We only got 19 mpg on that trip

While we are at it, what would you see as being a negative with a 347 for a daily driver?

None ... as long as the cam is not too aggressive

and

having said that ... a custom from a guy you trust could help with that

Well ...... Check that

You most likely would not get gas milage that would be all that great around town cause nobody could drive a combo like that around town like their Granny.

I know I can't do it in my 95

Grady

 

[bimmertech]

emmisions aside i recently went through this painful desicion.

i decided to put the blower on. i still second guess my plan almost daily and i will continue to do so until i get it on and feel the power.

then the first time i pop a hg or crack a piston/block--i will prolly sell it all and buy a 347 with a huge cam, vic jrs, and a bread box.

if your goal is 300rwhp you can prolly do that with a 306 n/a, and still pass emmisions--see grady's previous post.

 

[Car Nut]

Ok. Apparently my statement about 300 to 320rwhp was a little low. By no means am I going to cut back on any part of the 347 build except for the cam. The cam will be milder than most, but still better than stock and pass emissions. I think I've got good heads and intake chosen.

I'm not sure just what to expect from a 347 with AFR 185s, Performer RPM II intake, forged internals, and compression ratio no less than 10:1. No skimping on the MAF or TB, either. Full 2 1/2" Bassani exhaust. Will make sure that the injectors are the proper size. Any other parts will be addressed and then a tune to finish things up. With that said, all the emissions equipment will go back on and I should be good to go.

Maybe 350rwhp or a tad more is realistic, but considering that a 347 has more cubes than a 306, I figure that would mean more power. If I went the 306 route, I would still replace h/c/i and the other parts listed above, except with ones more suitable for a 306. In the end, the final price wouldn't be a whole lot different with a 347 or a 306 since everything is getting replaced.

Thanks for all the responses. It's starting to make more sense, I think.

 

[final5-0]

Ok. Apparently my statement about 300 to 320rwhp was a little low. By no means am I going to cut back on any part of the 347 build except for the cam. The cam will be milder than most, but still better than stock and pass emissions. I think I've got good heads and intake chosen.

I'm not sure just what to expect from a 347 with AFR 185s, Performer RPM II intake, forged internals, and compression ratio no less than 10:1. No skimping on the MAF or TB, either. Full 2 1/2" Bassani exhaust. Will make sure that the injectors are the proper size. Any other parts will be addressed and then a tune to finish things up. With that said, all the emissions equipment will go back on and I should be good to go.

Maybe 350rwhp or a tad more is realistic, but considering that a 347 has more cubes than a 306, I figure that would mean more power. If I went the 306 route, I would still replace h/c/i and the other parts listed above, except with ones more suitable for a 306. In the end, the final price wouldn't be a whole lot different with a 347 or a 306 since everything is getting replaced.

Thanks for all the responses. It's starting to make more sense, I think.

You wonder what to expect

and

You think 350 or a bit more is realistic

My combo put out sub level performance but the stock parts and emissions stuff held it back a bit

however

It really is pretty mild mannered

Others have hit about 310 to 325 with similar combos

No doubt in my mind those numbers could climb to or very close to 350 with some minor changes and yet still provide good drivability and pass emissions.

Lets settle at 335 rwhp for an example value here

302 X 1.11 = 335

347 X 1.11 = 385

How about that

Good drivability, emissions compliant, AND 385rwhp

Well .......................

Anybody have any probs with that line of reasoning

Grady

 

[Car Nut]

You wonder what to expect

and

You think 350 or a bit more is realistic

My combo put out sub level performance but the stock parts and emissions stuff held it back a bit

however

It really is pretty mild mannered

Others have hit about 310 to 325 with similar combos

No doubt in my mind those numbers could climb to or very close to 350 with some minor changes and yet still provide good drivability and pass emissions.

Lets settle at 335 rwhp for an example value here

302 X 1.11 = 335

347 X 1.11 = 385

How about that

Good drivability, emissions compliant, AND 385rwhp

Well .......................

Anybody have any probs with that line of reasoning

Grady

Amen. When the time comes to put it all together, I'll make sure to do the research and ask the right questions to make sure key items aren't missed. Thanks for clearing a lot of this up.

I think I would be very happy with a 347 setup, plus it's not something that most people have around in my area.

Thanks again.

 

[95snoozer]

car nut, i would run a stsyemax if I were you for better midrange and lowend. the rpm beats it topend by a lil but gives up under that.

if you are gonna build a weak 347, i definitely wouldnt run an rpm 2

 

[95snoozer]

yall got me thinking again... what would yall rather see in my car... no what will make the most power, but what would you like to see

snoozer comboed 347 or an s trim on my current HCI302?

I might start a thread with a poll about it... haha

 

[Car Nut]

car nut, i would run a stsyemax if I were you for better midrange and lowend. the rpm beats it topend by a lil but gives up under that.

if you are gonna build a weak 347, i definitely wouldnt run an rpm 2

Thanks for the tip. I knew the AFR 185s would do well, but don't have a preference on the intake. In my case, low and mid range are the key areas.

I've got to keep an eye out on some dyno sheets for 347 setups to see what happens in each combination, relatively speaking.

Thanks again.

 

[95snoozer]

hehe, I'm having an n/a week

 

[95snoozer]

now i have come bakc to my senses and want an s trim