carl0s

iTrader: (1)

Quick-ish question I'd appreciate help on.
I have a 6L LS2 from a 2005 GTO in my rx7.
I am planning upgrades to make 500hp or a little over (at the crank), and want to see how cheaply I can do it with used parts.

My main question is: Is it true that I heard the L92 heads are a good upgrade for this engine, and will they take me to where I want?
Are all "L92 heads" the same? i.e. can I buy any L92 heads that come up for sale on this forum for $650, with rockers, valves, valve springs included. Can I use them as they come - no need to buy extra valve gear or anything? Can I just bolt them on, or does other stuff need to be considered or changed? I understand I will need the car tuned before it will run, although it'd be nice if it ran badly, just so I could drive it to a tuning shop and leave it with them.

Will my existing GTO intake manifold still fit once I get the L92 heads?

Then I'd just need a cam, right ?

How about head gaskets? Are thinner gaskets available to raise compression or does it not work like that? I'm in the UK, I believe our fuel can handle a bit more compression that your pump fuel.

Or am I totally off the mark? I just want to see what second hand bits I could maybe start collecting.

cheers,
Carl

66tomcat

why are you driving the front wheels in an rx7?

carl0s

iTrader: (1)

I just prefer fwd. It's cool.

(lol, flywheel horsepower..)

carl0s

iTrader: (1)

I would've just said hp but almost every thread on here where someone says "600hp" the question gets asked if they mean atw or fly and the reply is usually "yeah, 600hp at the wheels".

cam

iTrader: (9)

L92 heads, PAC 1518 springs or Patriot Golds ( choose these depending on your intended usage and match to cam ) cam somewhere in the 220-230 region. You can get Patrick G to custom spec you a cam that will meet your goals if you want to take the guess work out of it. LS3 intake ( not sure if you have the L76 intake already as this is the same as LS3 ) Longtube headers and a good free flowing exhaust and of course a tune.

This should get you 500 fwhp effortlessly. You can go for more depending on budget and get your heads CNC's from someplace like WCCH or maybe AFR ( new stuff coming )

danieloneil01

bhp is what you mean even though no one goes by that. It's either 4WD, FWD, RWD or AWD. What you listed is front wheel drive at the wheels.

But as for your question, put an after market cam, headers and heads and you're there.


Here's the L92 heads

http://rds.yahoo.com/_ylt=A0oGk0HmMK...r%2520Head.pdf

v8pwr

iTrader: (19)

You only need a cam kit to make 500 bhp . The L92/LS3 heads are nice but you'll need the intake to go with it . If your LS2 is in good shape just do a cam upgrade with the supporting mods and you'll easily meet your goal . Do some searching and you'll see plenty of great results . Get some good heads like AFR, TFS, or PI with a FAST and you can maybe exceed 500 rwhp .

got-a-ls1

iTrader: (12)

yea 500 flywheel should be easy... i have ported ls6 heads and only a tiny tr220 cam with headers and im at probably 460-470 flyhweel (380 rwhp on mustang dyno and a4 tranny)

put a good size cam in that with the 4 inch bores of the ls2 and the ls6 heads and you will be well on you way to your goal i think...

carl0s

iTrader: (1)

Hi. Thank you (and everyone) for the help so far.
Does the above mean "220 to 230 degrees duration (intake / exhaust) @ 0.50inch lift" ? I'm looking at cam specs and trying to understand them.
If so, would one of these be a good starting point? :
http://www.summitracing.com/parts/TFS-30602002/ (220 degrees intake duration @ half inch lift)
http://www.summitracing.com/parts/TFS-30602003/ (228).

I like the idea of "just a cam". Could I get a noticable power increase with literally, just a cam and tune ? My fuel pump is sufficient already I think. I don't know anything about cams, but these being "hydraulic roller cams", well.. can I just use 'em or do I need to change some other stuff ?

I notice the first cam causes the stock valve lift to be .575", which I presume to be above stock, and the second one causes valve lift to be .585", which must be above stock because it's more than the other. I presume the stock springs are fine with that. The valves don't bounce back too hard or anything and cause seat damage or anything do they?
thanks again

cam

iTrader: (9)

Yes correct.

Im not familiar with TrickFlow cams so... I dont know what to say.

Look into EPS ( engine power systems ) they have a proprietary lobe design out now that seems to be making magic with small'ish duration. Meaning a more civilized cam thats doesnt tear up valve train components yet still makes EXCELLENT power.

Check this thread out. Patrick G specs custom cams that work very well

https://ls1tech.com/forums/generatio...heads-cam.html

carl0s

iTrader: (1)

Thanks. I looked at Patrick G's question sheet and to be honest some of the questions are erm, unanswerable by me, pretty much all of the "very important" questions anyway
I'll look at the thread you linked to. Cheers.

cam

iTrader: (9)

Haha yeah I understand. All Im saying is pick the right lobe for your goals. This is pretty much whats going to make your magic happen. Lift and duration only solve part of the problem its the mid lift events and how they treat the valve train etc. that makes a big difference.

Theres a thread that popped up recently with a "baby" 22x cam on LS6 crate engine that ran 11.2 in a full weight car. EPS lobes....

BTW EPS is a sponsor they have a link on the side bar here and its owned by Geoff formerly of Thunder Racing He was the cam guru over there too

Good luck man!

DaytonaFIC6

No need for heads in order to make an LS2 make 500bhp. Long tubes, chromoly pushrods, dual valve springs, a decent size cam (mid 230's-low 240's duration), a good tune, UD pulley and maybe port the stock LS2 manifold and TB. That should definitely get you there maybe a little more. If you are not worried about money go ahead and get a L92/L76 combo along with the cam and get them ported. That should put you close to 500whp which would be amazing in an RX7. Don't forget about the additional fuel you will need for all the extra air the motor will be bringing in.

squarehead

iTrader: (16)

http://www.ls1gto.com/forums/showthread.php?t=286447

http://forums.corvetteforum.com/c6-t...cam-specs.html

http://forums.corvetteforum.com/c6-t...hru-4-10s.html

lubelizard

iTrader: (5)

This is very useful info, thanks.

hivoltagedriver

iTrader: (1)

Quoted for truth. With full bolt-ons and a healthy cam, my car made 480/453 at the wheels (SAE corrected) on a reputable dyno. That was with a fresh T-56, Monster level 6 clutch, lightweight flywheel, CF driveshaft, and stock 3.46 gears in the GTO IRS. Not sure exactly what that equates to at the flywheel, but it is well over your goal. You could go with a fairly mild cam and hit your goal.

stupid monkey

Thanks for the info - also usefult to me.

I'm putting a near stock LS2 into a S13 for use in UK Time Attack. Victor Junior intake and wondering what sort of power I'll get with a cam - and trying to pick a cam/spring combo.