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383ci making 340whp - advices needed

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Old 04-04-2008, 11:37 AM
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Don't know what kind of torque it makes now...
Old 04-04-2008, 12:14 PM
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you said it had a nitrous kit on it that cam will love juice just spray it and save your money.......250 shot would really wake it up
Old 04-04-2008, 12:15 PM
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Originally Posted by Vetal
Don't know what kind of torque it makes now...
You dyno'd it. What were the torque numbers?
Old 04-04-2008, 01:56 PM
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I didn't dyno it - previous owner told me this. And all I wrote about the engine internals is from his words.
I only measured ET and 1/4 mph with GTech, got 110mph - the same that previous owner told me

Yepp I put nitrous kit on it but didn't have a chance to set it up yet.

Still I'd like to get a bit more NA power reading that PatrickG got 500whp out of 11:1 CR 347ci, I think that 340whp out of 9.2:1 383ci is pathetic
Old 04-04-2008, 03:48 PM
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its easy to put 400rwhp with an ls1 and even more with a 383. The PROBLEM has already been told to you by these guys;low comp,bad cam n/a,tune.

So its up to you to choose between staying n/a or waiting for the turbo. Dont waste your cash with an intake, LS6 is the best choice for $$$ to stay in your pocket and for boost too.

Cam, tune and NOS is the best for you now. And swapping the heads if you want to get that CR.

500rwhp with a 347 will cost a lot: AFR heads 2000$++, a ported FAST 90mm intake 1000$++, 90mm TB 400$,the right cam400$,tune 550$,electric water pump500$,Pulleys 250$,85mm MAF 200$?,the best exhaust $$$$,rockers 380$,clutch$$$, and other supporting mods....

good luck
Old 04-04-2008, 04:08 PM
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thanx for your opinion.
Do you agree with the temporary cam choice that's been given?
Old 04-04-2008, 04:20 PM
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your problem lies in the tuning. nothing more. that engine should produce ~385 whp n/a with that setup PROPERLY TUNED. find a GOOD tuner to spend your money on. the cam and everything else is fine, just get someone who knows what they're doing to start tweaking the computer side of it.
Old 04-04-2008, 04:31 PM
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Originally Posted by Vetal
Should the engine go out when changing heads?
It sounds like your working on a restricted budget and are saving for the turbo kit. Why waste your money on a temporary set up which will just deplete your funds. If I were you I would just put on a 150 shot of nitrous which will wake up your motor nicely and will not break the bank. That way there is no other major cost involed other than having the turbo installed once purchased.

If you want to go the H/C and piston Route then don't make it a half *** project...just dump the turbo set up and move on!!
Old 04-04-2008, 04:41 PM
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Originally Posted by THE RED "BLUR"-408
if you want a NA motor you need a cam with a 112 seperation to get the heads milled and a new cam its only goin to cost you about $500
LOL, now this is comical.

For one a new decent cam is gonna be in the $300 neighborhood alone. then a head change could ring in another $1200. Plus gaskets. And thats if he keeps the pistons that are already in it. If not then there is another $500 or more for pistons.

Sure he can sell the parts that are in the motor now & make back some money but he will still be out more than $500 to get where he wants it to be.

And for the record you don't have to have a 112 LSA to make power in a N/A set-up.
Old 04-04-2008, 04:52 PM
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switch to e85 and add timing untill your satisfied
Old 04-04-2008, 06:41 PM
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Originally Posted by s346k
your problem lies in the tuning. nothing more. that engine should produce ~385 whp n/a with that setup PROPERLY TUNED. find a GOOD tuner to spend your money on. the cam and everything else is fine, just get someone who knows what they're doing to start tweaking the computer side of it.
Glad to hear that I suspect the tune is not very good
I'll tune it myself as soon as I get some of the sponsors to ship me HP Tuners over here I'll be first one in my country to tune LSx, so only help I can get is from you guys here

Originally Posted by david vericker
Why waste your money on a temporary set up which will just deplete your funds. If I were you I would just put on a 150 shot of nitrous which will wake up your motor nicely and will not break the bank. That way there is no other major cost involed other than having the turbo installed once purchased.

If you want to go the H/C and piston Route then don't make it a half *** project...just dump the turbo set up and move on!!
I think I can afford cam change, and maybe even sell it later
No, I will not change heads and pistons.
Another reason why I want it to make a bit more HP is because in one of the events here we have separate NA class, and I'd like to compete in it
Old 04-04-2008, 07:43 PM
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With that low off a compression ratio a much "bigger" cam will not produce the HP/TQ numbers normally associated with a nice cam swap. Also, is your car a M6 or A4 and what gear are you running? If it's a M6 you probably need a bigger gear - A4 a bigger stall and a bigger gear. Like I said in my previous post - don't do a half *** project it's a waste of time and money. Either commit to the turbo set up or the NA set up, and do the project right. Just my 2 cents.
Old 04-04-2008, 08:07 PM
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M6
It won't be half-*** project. It will be turbo. But for few months from now I need different cam
Old 04-04-2008, 08:14 PM
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IMO, if you already have the N2O, get it set up properly and use that until you get the turbo. Don't waste your money if you're just going to go back to what you have now.

As for PatrickG...he used the best of the best, and spent lots of money to do it. Also, a good tune would help out a lot. If you do decide to get a new cam, I would get Patrick to spec you out one for $25 and then $389 from Thunder Racing for the cam.
Old 04-04-2008, 08:30 PM
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Originally Posted by s346k
your problem lies in the tuning. nothing more. that engine should produce ~385 whp n/a with that setup PROPERLY TUNED. find a GOOD tuner to spend your money on. the cam and everything else is fine, just get someone who knows what they're doing to start tweaking the computer side of it.
I agree!! You need to have it scanned and see how much timing the car is
running. Possibly the previous owner had a TURBO tune anticipating a turbo
and the timing is low. You probably need to bump the timing up to 27-28*
Old 04-05-2008, 05:49 AM
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I also hope that problem lies in tune (car doesn't even idle after cold start, so tune really may be less than ideal)

camaro_fanatic, I know PatrickG is using best parts and a lot of experience, but he's getting 1.45whp per ci, I have 0.92whp per ci. The difference is dramatic and there should be other reasons for that, other than best parts and 2.5 point lower compression ratio
Old 04-05-2008, 08:01 AM
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Forget about the cam idea, it's a waste of money without changing everything else. Going to a mid 230s duration cam like most are recommending is a big mistake on that engine. You simply cannot throw a large cam in a low compression engine and expect it to work. You may see an increase in power with a mid-high 220 duration cam, but the gain you see won't be worth the cost. Basically, either keep it the way it is and wait until you can turbo it, or change the whole top end to make the naturally aspirated power you see other people making with properly matched setups. And good luck tuning on your own with that BBK throttle body.
Old 04-05-2008, 08:48 AM
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Originally Posted by Marc 85Z28
Forget about the cam idea, it's a waste of money without changing everything else. Going to a mid 230s duration cam like most are recommending is a big mistake on that engine. You simply cannot throw a large cam in a low compression engine and expect it to work. You may see an increase in power with a mid-high 220 duration cam, but the gain you see won't be worth the cost. Basically, either keep it the way it is and wait until you can turbo it, or change the whole top end to make the naturally aspirated power you see other people making with properly matched setups. And good luck tuning on your own with that BBK throttle body.

Ditto that^^^^^^^^ I would see what else you can get with tuning. Low compression will keep you from making good numbers until the turbo goes on.
Old 04-05-2008, 10:53 AM
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So, opinions divided - some (me included) think that "bigger" cam would make more power, but few say it won't

Marc, what's wrong with BBK TB?
Old 04-05-2008, 11:21 AM
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As Patrick if it will help you, he is the cam master.



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