02402RAMAIR

iTrader: (8)

Doing some research and need some info. would like to see some engine combos 600rw plus N/A. looking for closer to the 700rw but anything in between would be nice.

Anyone running more than a 4.000 stroke and turning 8,000 rpm?

Anyone running big rw #'s with the FAST LSXr?

Anyone running 13 to 1 on pump gas?

Links to build would be great also

Thanks for any help
Kris

Stang's Bane

iTrader: (22)

That would be stupid.

No-one with a street motor is going to be anywhere close to 700 rwhp on a NA pump gas build with only a 4" stroke.

99LS6SS

iTrader: (4)

That would be awesome to see something like that on the streets. Sounds like a lot of money though

02402RAMAIR

iTrader: (8)

That is several different questions so don't put them all together.

02402RAMAIR

iTrader: (8)

Thanks for the help! You answered zero of my questions.

LS6427

iTrader: (2)

You can make 700+ RWHP with the right heads/intake, 13:1, race gas, big cam, M6.

Build a 454ci resleeved LS2.

.

02402RAMAIR

iTrader: (8)

looking for builds like this

https://ls1tech.com/forums/dynamomet...-649tq-na.html

Stage7

iTrader: (1)

Are you considering going full race now? High comp/race gas only?

02402RAMAIR

iTrader: (8)

I am looking for info on all of the above. I am just looking. lol

niceguyyy01

iTrader: (13)

subscribing

LS6427

iTrader: (2)

There's a handful of those types of builds out there.

Depending on your wallet you can have whatever you want. That FMS engine is not a streetable engine. Can it be driven on the street, yes, anything can be, but its a drag engine.

There's only two questions to ask:
What do you want to do with the car?
How much money do you have to spend?
Street only...
Street/Strip...
Strip only...

There's a bunch of 600-650 RWHP cars out there that are daily drivers too.

.

Wnts2Go10O

iTrader: (12)

13:1 running on E85. theres your pump gas. solid roller, obviously. the LSXR still a bit on the questionable side. if you used an LSX block, a 4.185 or 4.2 inch bore with the 4" stroke would be a screamer

LS6427

iTrader: (2)

Think there would be enough gasket to last with a 4.2" bore and 13:1 cr?

.

Wnts2Go10O

iTrader: (12)

im jus validating your concept, not the execution. you do realize this car will not be very street friendly at all at 700rwhp n/a, right?

LS6427

iTrader: (2)

It would certainly make a fun weekend warrior though.

.

RayZ06

iTrader: (1)

My 431CI LSX Block made 646RWHP NA and easily RPM to 8400RPM through a Turbo 400 and an 8" Convertor.Easily over 700RWHP with a Clutch and a Manual.C-14 Race Gas as its close to 15:1 Compression.Big Stuff 3 Controls it all.Thanks to Dale Cherry,John Meaney

hotrodscrap

iTrader: (10)

Wow thats a nice setup Ray, and to the OP good luck making your goal. Sounds like a lot of fun!

-SS

02402RAMAIR

iTrader: (8)

Thanks. That's the kind of stuff I am looking for.

What is street friendly? LOL
I have street driven my blown alky BBC truck on slicks before. Was it fun? HELL YES!

I sold my entire engine out of my car so YES I am doing research on my next build.

I am looking at something along the lines of

RHS block
big bore and short stroke to be able to rpm (8000)
solid roller
Allpro heads
compression is still up in the air right now. I ran 12.0 in my last motor with great results. 28 degrees of timing on pump gas with no KR. I am thinking around 13.0 so I can use a splash of race gas with the pump gas to do some street driving (not much). full race gas for the track. Wife will be pissed if she can't go for a ride. lol
Intake is still up in the air. I don't see the fast LSXr doing the job.


This is a 6 speed. I will be using a slipper clutch and YES you can street drive it.

Stang's Bane

iTrader: (22)

The stupid part was trying to run 13:1 on pump GAS.

By that I mean 91-93 octane premium unleaded.

Can you run it on E-85? Hell yeah and it would love it.

The motor you described will not like the street at all. Can you do it? Yeah.

That FMS motor would not last long on the street. Hell it didn't last long in a race car. Don't worry about limiting stroke so the motor will RPM. You will be far more valvetrain and oiling sytem limited on your RPM than any crank that can be stuffed in a ls motor.

700 rwhp is a hell of a lot harder than 600 rwhp. And 600 rwhp in a streetable combo isn't at easy as some people think.

I wasn't trying to be an ***. I was just concerned about some kid reading the 13:1 on pump gas and then trying it with his motor and it blowing up. Somebody mentioned the term DCR on here in passing a few years ago and within 2 months people were running around here acting like it was a new spec you could order on a camshaft.
There are way too many people around here that think that just because you can do something, then that means you should do it.

02402RAMAIR

iTrader: (8)

It's one thing to cruse around town. It's another to drive it like a stupid *** putting big loads on the engine at race fuel timing.

Years ago the said limit for pump gas was 11.0 to 1. I ran 12.0 to 1 in my last motor making 550rw on pump gas. Now I see many builds going 12.5 to 1 with no issues. What is the limit? A street tune should have a conservative timing curve and knock sensors adjusted to pull timing accordingly.

What happened to the FMS motor?