Look at the dyno sheet. With an ATI D1SC and the top end I have, it should be linear all the way up to 7000 RPM. After about 6000 RPM it falls on its face. I already have a metal inlet tube for the blower.

I think the potential for it hooking with another 50 RWHP is there, but going up to 100 RWHP+, I would certainly to expect to see some marginal traction losses. Not going to change the tires out either. Everyone has their tire of choice, and mine is Nitto DR's for sure. Mickeys would hook better, but I do drive (not by choice) in the rain sometimes just as I drive the car a bit in the summer and I can get caught in it. The Nitto's I can control just fine in the rain. Mickeys would slide everywhere and when driving on dry surface, would stick to the point I would also worry about picking up nails (numerous friends of mine have picked up nails that left them with a flat tire).

Also, perhaps this is my preference as well, but I LOVE the way my D1SC sounds with my cam. F1A's to me (even though they are killer for power), just sound really annoying with their non stop very loud high pitch whine. I would be happier just with upgrading the heads and intake (and headers) and upping the power.

Thanks for those that answered my original questions with power and boost guestimates. It seems like I should be in the 700 RWHP mark with maybe 13(ish)#'s of boost. I will have to take this into consideration, as I am very happy with my current setup, but it always bugged me that my setup was ideal with the execption of baby AFR 180 heads and a hand ported LT1 intake.

 

well it sounds like you already have your mind made up. Also, brodix offers the track 1 heads with LT1 coolant passages. AFR 227s or the brodix would be my choice.

 

I didn't post the thread to make my mind up, I just wanted to know what the power/boost numbers would be.

I've always been a big AFR fan. Thats what I'll always stick with. Most of the big power makers in FI for LT1's are using AFR 227's.

If the timing is right, and I get a decent amount offered for my current heads and intake, I might end up going down the AFR/LT4 intake route. But for now I really just wanted info.

 

ah, ok.

Well, shoot me a PM on those afr heads, i'll see if i know anybody interested

 

Will do when I am ready.

 

are they ported or anything? I may be interested as-is lol

 

They are fully ported (CNC'd) by TPIS. Probably equivilant really to AFR 195's. (More than $3,000 invested just in the heads).

 

Flow #'s?

And I hear what you're saying on drivin on the nitto's. I too use them as my street tires, and have centerlines with MT's for the track. I come across rain quite a bit also, and MT's are just not an option. You're trying to walk a fine line, and for what you're going to spend doing heads/intake, I would imagine the cheaper route to getting an extra 50 RWHP would be to just throw a nitrous kit on it and call it a day. Its not like you need that 50 hp on a daily basis. But to each his own. I couldnt see spending that kinda cash for 50 hp, but if you can get good re-sale on your stuff maybe it'll pan out for ya. Good luck.

Oh, one more thing, food for thought,........did you ever stop to think that since you're pullied to the max, spinning it past 6k rpm just isnt pushing anymore air? I recently swapped out pullies on a charger and didnt see but 1/2 psi change. Its possible the charger just cant move enough air for 7k rpm, not because of the heads/intake, but the engine demand to push past that point and still make more power. Just because you upgrade to an F1A doesn't mean you have to max the thing out. You can pulley down and make 18-20 psi and be where you want to be with room to grow again. Heads and intake aren't going to get you that. I dont mean to round about your question, but it just doesnt make much sense to me, but hey, its your car, not mine. I would hate to see you spend $3-4 on a new top end and barely gain maybe 25hp, and still have a maxed out setup, I just cant see it. Again, good luck with whatever the choice, and let us know the results.

 

Your kind of missing the point. Its not just about power, its about what setup will taylor my specific wants and needs. The combo I have right now is trying to push more, but it is being choked by the lack of air the heads will allow to enter the engine. The engine and top end itself can take more than 7000 RPM, the blower technically maxes out (impeller RPM) at 6850 RPM. The heads flow somewhere just north of 300 CFM (highly ported for AFR 180's). I can't remember the exact flow numbers, but if it came to where one was motivated enough to buy them, I would dig up the info.

I would be happiest here just keeping my D1SC and maybe going the route of getting ported out AFR 227's with the better breathing LT4 intake. Then there would not be as much pressure on things trying to force what it is just not capable of with the smaller heads.

But again, this is all just speculation for now. I JUST WANTED POWER AND BOOST INFO. I do like my current setup with the traction I get, and may end up doing nothing at all and staying where I am at.

 

I just have a hard time believing the heads flowing 300+ r your "problem". You're spinning the charger to the max rpm-wise, but you're engine is probably needing more air than the D1sc can feed it, not because the heads/intake are restrictive. How big is your cam if you dont mind me asking, and how big is your throttle body? I truly believe the D1SC is just out of steam on your application. You can overspin it and achieve nothing more than heating up your intake charge more without producing any more pressure gain. Not trying to hijack your thread and throw it off course, but this is on subject. Talk it over with some engine builders and see what they think. I dont believe you'll gain much at all by removing a little restriction if the headunit is pushing as much cfm as it possibly can. All you're going to accomplish is a loss of minor amount of boost due to the better flowing heads/intake, and very little gains in power. I do understand what you're getting at, but costwise its like pissing $$ down the toilet if you ask me. Either way, its still your car, and I dont care which way you go. These are my thoughts on the subject and no hard feelings meant.

 

It's funny how you keep saying "its your car", but yet you seem to know what I want or you know my car better than I do.

Dude, do a search on any guy in this section of the forum running big boost and 700+ RWHP. Most of them (or at least the VAST majority) are running AFR 227 sized heads. Look at xxsaint. Almost the EXACT same setup besides LT4 intake and AFR 227 heads, and he is yet almost 100 extra RWHP than me. You're just gonna have to trust me when I say the heads are the choking point. The engine builder who has been in the performance engine building buisness most all of his life, and Bryan Herter from PCM's for less (IMO probably the most knowledgeable guy on the planet for LT1 tuning) all have told me this from the get go. It is further backed up by repeated runs on the dyno and the numbers which would normally show a steep increasing pull all the way to redline show a fall in power with a good 1500 RPM left to go.

 

Ben, you do have a couple of freaks out there squeezing 700rwhp+ w/ LT1 heads and intake too BUT they're fed w/ F1 and FIA's. I hope one day in the foreseeable future I can post a graph of what mine puts down.

 

FWIW, theres p1sc's pushing 650 at the wheels with heads that flow around 300.
I believe theres more to your "lack" of power than just heads

 

As do I,.....but hopefully for your sake you are right CALL911. I said I find it hard to believe, BUT I would love nothing more for you to prove me wrong and be happy in the end, thats all. I personally couldnt see spending about the same amount of $ only to hit the same wall in the NEAR future, but like I said 3x already, its your car. I know you were asking others' opinions on gained hp, but its completely obvious you're dead set on doing it regardless so just get 'er done and let us know. I will throw my bet in there that you see about 50RWHP tops, and then you'll hit a brick wall again.

On another note, I would be interested in your current heads but Im sure they're out of my price range,.....but pm me what you'd be looking to get out of them and what you're including/excluding from them, and whats thier cc's.

 

Very few can achieve that with an LTx. One guy that comes to mind (and the only ltx guy i can think of) is 1standgoal on here, but he had that thing pullied to the max. Most guys that make ~650rwhp with the P1Sc are LSx guys... and they have heads that flow some serious air.