Ok since the spun bearing in my N/A stock 4.6 w/ every bolt on imaginable including Heads, Cams, & FRPP Intake Manifold (In a previous thread I discussed my engine issue) -->

Now I am upgrading to:
- Stroked 5.0 302 (Compression Ratio of 8.5:1 so I can go more boost)
- All forged Internals
- And either a Kenne Bell or Whipple

I am expecting around 600rwhp - 650rwhp!!!! I am so so excited. I have never had such a beast of a car...

 

Bad lemons into wicked **** lemonaide!!

Now I guess comes the learning curve of traction issues...

 

I guess that is a problem I am willing take... HAHAHAHA... But in all seriousness I am going to take that the break in period to get used to this power b/c I don't want to end up in a wall somewhere right after I get the car back. I am also planning on taking the car after the break in period to some curves for a track day so hopefully I can use that time to get used to the power as well.

 

Don't go that low on compression it will be a dog, you can't run more that 15-18 PSI on pump gas either way. And even at that level your going to upgrade a lot more than what you stated to have it reliable!

 

Yes you are right about the upgrade (i.e. Fuel Sys) but I didn't feel like writing it all out; call me Lazy... But as for the compression I assume you are talking about down low power; well considering with a roots or twin screw you begin making boost almost immediately so I am not to worried about it. And the boost yes 15-18 psi is what I am looking at unless I wanted to run E85 (Which I really don't want to do either.

 

I'd be more worried about the transmission. The only thing your doing by running that low of a CR is forcing yourself to run more boost to make the same amount of power at any given RPM (I'm familiar with how a twin screw works ).

 

I don't mean to be disrespectful so please do not take offense. And obviously there is a give and take w/ CR vs. Boost but I can't run too hi of a CR considering the peak pressure inside the cylinder (and I know you know what I am talking about b/c i have read some of your post before and found them very insightful so I do not want to seem like I'm being condescending). As for the tranny that will be replaced in the near future and along withe the clutch.

If you have any suggestion or recommendation please don't hesitate to throw them out here. And again I apologize if I seemed condescending.

 

For supercharged app, I thought it was ok to go with low 9 compression?

 

You can go with low 9's and higher but in all depends on how much boost you want to run and to be honest what you want your end results to be... I don't want to act like I know what I'm talking about but I know a little bit. So from my understanding the combo of your Compression Ratio and your boost is going to equal the peak pressure inside your cylinder so if you run a CR of low 9's you will have to run lower boost or run the same amt of boost but use a cooler burning fuel (E85 or race gas) or larger intercooler or something like that...

 

ok, I see where you are coming from. I am trying to understand all the Supercharger configurations. This is my 1st supercharged vehicle.

 

No to be completely honest with you it is mine too!!!!! That is why I am saying there are SO many more competent enthusiast on this forum than I and I only know a little bit about a little bit... I just hope what I was saying made sense to you and that it helped you...

 

Like the saying says, "know just enough to be dangerous", oh yeah thats me lol

 

I would strongly recommend you do a little more homework on what legitimately works before you purchase. I would never recommend a customer go that low on compression unless you were look for 20lbs+. It's just really not necessary unless your dead set on it.

On the subject of that why are you set on 15-18lbs? Power goal I'm assuming? Why not aim for less boost and more power? IE complimenting mods. The less any single component has the work the better your longevity is going to be.

 

Robert, I really do appreciate the help and hope you didn't take any offense to what I said earlier... So, more compression... What are you thinking? And supporting mods, what are you suggesting?

 

Anything in the low to mid 9's should be a shelf stock piston for whatever kit you might like to go with. Somewhere around 9.3 is a happy median and is what I'm running. If it were me and I had no prior knowledge it's really hard to beat the higher CR aluminator in the mid $3k range (last I read anyways).

As far as supporting mods a little snooping might be advisable but the basics are obviously heads/cams/headers/exhaust. Once you pick your power adder there may be things to add to that list. I think you already have head work so keep in mind that for example a pulley is rated for 12lbs, it might be more like 10 on your set up but have better power because of the increased air flow. It's all a game of matching components and needs to be well thought out for the optimal set up.

 

Thanks Robert and again I appreciate it... So your right I have all you mentioned: Heads, Cams, LT's, & Exhaust... Yeah unfortunately there aren't too many already built blocks around the 9.3 range... The closest to that is Benspeeds at 9.5. I guess we'll see what happens... Thanks again Robert.

 

Eagle, what can I expect for install charges on a purchased shortblock. Including the transfer of the parts from my setup to new shortblock?

 

John,

don't forget with forced induction your bolt-ons do yield more power than they normally would n/a. Also, be sure the cams you have WILL work with F/I. There is a difference.

Are you planning on running any race gas? We just tuned a Supra with Q16 with some good results. Unfortunately, the wastegate decided it wanted to be difficult so we couldn't get to optimal boost, so there's still more power to be had! Higher octane and more boost will always give you a good punch, so long as you've got a good tune.

 

Yeah I know that there are cams for specific results... Thats why my cam was initially setup for FI and I took a hit on the pwr when it was N/A but I will see better results now, So thank you... As for Race GAS, ummm, haven't decided if I will ever run it??? I am sure there may be a few opportunities to see what we can make but We'll see...

So, after talking back n forth with my shop we are going to go with a little Higher compression but not sure how much higher...

 

Couldn't tell you, but I would guess $2k+ with the amount of labor involved @ a good shops hourly wage.

Race fuel is cheap insurance if/when you track the car, plus you'll run faster