ss785

Hey all. I am looking to make between 500-525 BHP. This engine will be backed by a Porsche transaxle so I am actually torque limited. What is the cheapest combination to make this kind of power? I am looking at the PRC LS6 heads and a TR 224 cam. What do you guys think?

DONAIMIAN

iTrader: (18)

What are you TQ limited to? You don't have a heavy drivetrain to soak up power so I think this should be looked at a little different.

chrismorales75

I don't think that cam would make 500 hp, it's a 400 hp cam on a stock head, but then asking for 100+ more hp from a cylinder head swap is kind of a stretch I think, but I could be wrong, cheapest way would be with nitrous, but as far as heads and cam, I would get a head with a smaller cc to give you more compression which is a little more free horsepower. Maybe with the cam, a little more compression, good flowing cylinder head it'll close to that tuned right.

ss785

For street driving I am probably torque limited to around 500 ft-lbs easy driving. However, with 334/30/18 Hoosiers on the car at a road course, I would like to stay well below this figure...I will spend the money on the appropriate bolt-ons, but I cannot justify spending the extra grand or so for a pair of AFR 205s if I can get decent results for cheaper. If they are necessary, then that is the way I will go. A decent idling cam is also a must. Most of the power figures I see are dyno results quoted in rear wheel horsepower. I am looking for 500-525 brake horsepower. Thanks for everyones input.

Dragkid1917

iTrader: (2)

i would say that a 224 is too small. In all honesty a big cam sounds small with a large LSA. You could throw in a v.2 or a 233/239 with a 114 or 115 LSA and it would sound like it idled just a bit rougher then stock. Id say a bigger cam and a very free flowing head is what you really need, because when you think about 500-525rwhp thats like 575-600+ crank H/p outof a 346 ci motor. A bigger cam is in my oppinion a must.

ss785

Yeah thats the thing...I am looking for 500-525hp at the crank. Typical drive train losses of 15% would yield around 434-456 rear wheel horsepower. So I am looking for horsepower in the 434-456 RWHP range.

DONAIMIAN

iTrader: (18)

He said 500BPH not 500WHP. The heads and cam combo mentioned in the first post should get you really close. Its just gona come down to the bolt ons.

PICNIC_GEORGE

iTrader: (3)

You building a GTM? Factory 5 ***! And what country are you in?

You should be able to get close 500 hp at the crank with that setup. Don't know if you'll hit it but you'd be close.

rocksws6

iTrader: (4)

The package that Patriot is advertising right now would probably be ideal and wallet friendly.

ss785

Picnic George....GTM, very good guess!

DONAIMIAN

iTrader: (18)

what other reason would someone have to run that transaxle

jmilz28

iTrader: (13)

From what I have seen (take it for what it's worth), you can get there with stock cubes and a mild cam, but it won't be cheap. Look at Tony Mamo's combo with the AFRs, 224/228 cam, ported FAST, long tubes, and you're getting there. Can be done but everything has to be just right and tuned well, and won't be cheap. My buddy has the above combo but with the LS6 intake and stock TB and hit 423 rwhp at MTI (also take that with a grain of salt). But add the ported FAST and 90/90 and you see how you could get there if the stars kinda align for ya.


Good luck.

12secSS

iTrader: (30)

I competely agree here. 500bhp-525bhp comes to about 425rwhhp-445rwhp if using a 15% drivetrain loss. It is very doable, but with the right bolt-ons.

2000Hawk

iTrader: (5)

I see no reason why the set-up you mentioned wouldn't work. PRC heads wont kill you budget wise, and the TR224 is a good proven camshaft. You can always give TSP a call, tell them what your building and what for. They can easily set you up with something that can meet your demands, and keep it resonably priced.
-Joel

508Stroker

Ultima GTR


GTM's are bad ***. One of the coolest cars I have ever drove. I was in one that was cam only and because of the weight I was shocked at how fast it was. That thing would have been faster than an fbody with 100 more horse for sure!



To help out your thread, I'd go ever so slightly bigger on the cam, and all should fall in line. You have some reasonable goals set out in front of you, and I think you will get it.

T-56SLPSS

One of my buddys made 510hp 475tq with the MS3, and full exhaust only

ss785

A stock LS6 makes 400 hp at the crank. So I need to pick a 100 horsepower from bolt-ons. Between heads/cam/and headers, this should be easily doable without a monster cam, am I right? I am just confused because I have seen several posters with the 420 rwhp in their signatures, which equates to very close to what I am wanting.

ICRAZY6

iTrader: (68)

Take a look at what I'm running in my car. It can be done. Good luck with the project.

kozak

iTrader: (2)

There was a post not to long ago by patrickG (i think so) that described in detail the inner workings of a setup that would produce 500 hp and what you should look for in a H/C/I setup to produce 500 hp.

RedWS6 00

Yep i vote for that one too. I have that fitted, made 477hp (flywheel) at 5500rpm, if I get the fuel mixture correct above that RPM, install my underdrive pulley, up the revlimiter to 6500rpm I think I could get over 520hp.
The heads and cam keep produceing power till about 6500rpm. If you have changed the full exhaust, and other bolt on mods, you should be able to produce something like this with the Patriot heads and cam:-

Ignore the torque curve its not correct on the graph.