vmax1500

Finally results from ETP’s LS7 style heads… Here’s the preliminarily break-in dyno numbers from my buddy Stroker RT’s (AKA Roy) 427CI LS2 based 427CI motor… his car is a M6 C5 Z06… full exhaust, MAF tuned, no dry sump, pump gas… pretty impressive results… 100RWHP more than stock C6 Z06!

A simmilar motor is going into my A4 98 Firebird next week... it will be a little more of a race setup so it will be interesting to see what kind of results I will get...

PS. Thanks to Jason @ Katech for rushing me out LS1/LS7 spacer kit... it was the final piece of the puzzle... I needed new injectors, so I decided to get LS7 injectors and will use the LS1/LS7 injectors adapters also from Katech...

gtodoug

iTrader: (1)

Where is the tq? My 408 has a fairly weak tq curve because it's got a rather large cam and my tq curve is more than that. I would have expected more tq for sure, our HP curves are similar (mine being 5-10hp more throughout the curve) up to 6000rpms, then that one runs away from mine.

Can you post the entire setup? Very curious on the cam/head specs.

Dougie

vmax1500

I don't know the cam specs in his motor... but the heads are out of the box ETP LS7's... they are big heads that require RPM... as you can see it likes to rev

STROKER R/T

this is first two pull ...no miles... breakin tune little timming.. just whated to show starting point for tune...have a beer !!!!

gtodoug

iTrader: (1)

Well if it's any constelation, i first dyno'd mine in with 15 miles. Next dyno session was at 1500 miles.

First dyno was 530whp
Second was 540whp

Good luck guys setting it up. maybe playing with a/f and timing will get that tq number up.

dougie

SLED28

iTrader: (7)

Too big a cam probably or wrong split maybe

SLED28

iTrader: (7)

Come on now.... 2 pulls but its on dyno run #9

gtodoug

iTrader: (1)

Yeah, but the runs don't mean anything. I store all my runs at my dyno place and pick up where I left off.

Dougie

11 Bravo

iTrader: (3)

I'll take GM LS7's over ETP's any day of the week.

x phantom x

iTrader: (14)

.
Honestly, I'm hoping to see you get those numbers up a bit. 550rwhp is definately very nice, but for a 427ci with ETP LS7 heads and an aftermarket cam?? The 470tq seems low to me, although I see it does have full exhaust which I am sure could improve that alittle. By full exhaust, do you mean headers + cats + aftermarket catback, or what? I'm sure you'll pick up 10-15 hp after the motor breaks in alittle, and hopefully after break-in + some more tuning you can get that TQ up above 500.

Definately some nice numbers, and I bet after some good tuning and break-in they will be even more impressive.

Katech_Jason

iTrader: (19)

Anytime bro!

Patrick G

iTrader: (14)

Do you know the specs of the cam? Looks like either too late of an IVC or too wide of an LSA. Area under the curve is not optimized considering your outstanding choice of parts. Don't get me wrong, top-end power is very nice, but I think there's been a lot of power left on the table with this particular cam choice. Most purpose-built NA motors (not dual purpose) should make 1.25 times their displacement in torque. That's 534 tq for a 427.

vmax1500

I don't know the cam specs... but I do know that this is somewhat of an experimental setup as it's the 1st build that I know of based on the ETP LS7 head... it's safe to say that my engine builder (the same who built my buddies engine) has just got started with this...

When you say 1.25 X displacment in torque, is that based on the numbers at the crank?

David Gordon

iTrader: (1)

If his heads flow so well do you think maybe they cost him low end torque? Or would too big of cam or too much LS do this. I made 470 rwtq out of my 395 cu". Just wandering I am about to start another motor and just seeing what everyones vuse are.

Abdullah

iTrader: (2)

can you share the cam specs? the numbers seems to be a little low for LS7 427. mizfit 427 with GM LS7 heads did 607 rwhp and LG motorsports LS7 427 with GM LS7 heads C6 Z06 did 624rwhp.

Patrick G

iTrader: (14)

I'm talking about rwtq (to the wheels). It's not easy to do, but if you look at most of the top performing NA engines on this board, they all make 1.25x CID in torque or better (at the wheels). Remember, when you have more torque, you will have more hp.

Patrick G

iTrader: (14)

No, better heads will enhance cylinder filling, making it easier to achieve 1.25xCID in torque. He just has some mis-matched parts right now. Once it's all sorted out, you will see some amazing(er) numbers!

Beast96Z

iTrader: (21)

I agree. Looks like a experimental cam selection. Like you said, maybe to late of a IVC or not matched correctly to the EVO.

DavidNJ

For an engine which doesn't 'come on the cam' until 4700, is weak down low,and has an unrestricted intake, it seems to run out of breath rather early.

What is the bore and stroke?

vmax1500

Same as the LS7... 4.125 X 4