Supercharger hp question

885.0conv · Feb 16, 2010

I was wondering how much hp will be produced at 6-8 psi. I have been told that I am making about 300 right now. I read that an AOD can handle about 350 and I didn't want to push it right now.

SpartaPerformance · Feb 16, 2010

885.0conv said:
I was wondering how much hp will be produced at 6-8 psi. I have been told that I am making about 300 right now. I read that an AOD can handle about 350 and I didn't want to push it right now.

My general rule of thumb for a pushrod 302, is about 25RWHP for every 3psi provided tune is good and cam is proper.

gt40_2003wes · Feb 16, 2010

SpartaPerformance said:
My general rule of thumb for a pushrod 302, is about 25RWHP for every 3psi provided tune is good and cam is proper.

umm i would say its closer to 50 rwhp for every 3psi on a typical H/C/I 302 cause most guys get about 500 rwhp out of 12 psi.

dcurtis · Feb 17, 2010

I would guess around 370-375 if your at 300 now. Type of charger will make a good difference also, what type of charger are you planning to run?

885.0conv · Feb 17, 2010

I haven't really done my research yet but I saw a vortech V1 A trim with the complete kit for 1500. I don't know if that is a good deal but after I get the rear end changed to 4.10's then the supercharger will be the next thing. I was just wondering if I should beef up the tranny before I put the sc in. I might go to a 347 later but that would be the final thing and I will definitely build the tranny up then.

dcurtis · Feb 17, 2010

If your going supercharger I would recommend 3.42 or 3.73 over the 4.11's. You'll be out of gear when the charger gets happy.

7upstang91 · Feb 17, 2010

dcurtis said:
If your going supercharger I would recommend 3.42 or 3.73 over the 4.11's. You'll be out of gear when the charger gets happy.

+1 I would have to say 3.73, I run out of gear way to quickly, I believe there is a 3.90(somewhere in there) would probably be good for the auto. 4.10s with the supercharger may spin alittle to much.

885.0conv · Feb 17, 2010

So 3.55 would be a good gear? I can get a rebuilt rear end with those in for 300.

SpartaPerformance · Feb 17, 2010

gt40_2003wes said:
umm i would say its closer to 50 rwhp for every 3psi on a typical H/C/I 302 cause most guys get about 500 rwhp out of 12 psi.

50 is waaaaay to optimistic especially if you're running an anemic street blower.

7upstang91 said:
+1 I would have to say 3.73, I run out of gear way to quickly, I believe there is a 3.90(somewhere in there) would probably be good for the auto. 4.10s with the supercharger may spin alittle to much.

+1 the 3.73 is a much better choice.

gt40_2003wes · Feb 17, 2010

SpartaPerformance said:
50 is waaaaay to optimistic especially if you're running an anemic street blower.

so your saying a H/C/I 5.0 with 12 psi should only be 400 - 425 rwhp? i would burn it.

Dino Dino Bambino · Feb 18, 2010

885.0conv said:
I was wondering how much hp will be produced at 6-8 psi. I have been told that I am making about 300 right now.

You won't be putting down anywhere near 300rwhp through an AOD. If you had a T5, yes, but in your case it'll be more like 270rwhp. I expect you'd have ~360rwhp with a 6psi boost and ~400rwhp with 8psi.

885.0conv · Feb 18, 2010

I was thinking 300 at the flywheel. Also I was thinking the 350 hp rating for the AOD was at the flywheel.

SpartaPerformance · Feb 18, 2010

gt40_2003wes said:
so your saying a H/C/I 5.0 with 12 psi should only be 400 - 425 rwhp? i would burn it.

Should only??? I never said SHOULD but unless i missed it I can't see in his signature what cam he's running or what type of ignition, fmu, what kind of tuning? Does he know somepplace to dyno tune and burn chips? There are a lot of factors and over the last 16 years I've seen tons of people drop loads of money and then cry when they've gone to the track because somebody else said......

885.0conv · Feb 18, 2010

Just to answer, I am running the stock cam and ignition right now, and there is a place two blocks down the street that tunes. When I do get the sc I will research into a cam and other parts. I was just worried about the tranny. It sounds like I should upgrade the tranny before I get the sc.

tannerc91gt · Feb 19, 2010

9psi isn't going to net you 150hp IMO... 25/3psi seems a lot closer to what i've seen. H/c/I can be a lot of different combos so it's hard to say 500hp from hci and a blower (IMO)

WIPLSH · Feb 19, 2010

I do believe for every 1 psi of boost its worth 10hp.

Supercharger hp question

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