ahhhh should i stroke my LQ4?? opinions??

[KILLER-LS1]

guys, i just got my LQ motor, and im definitely doing:

forged rods/pistons
ARP head and main studs
edelbrock lingenfelter CNC'd heads

i have the "ebay" PTK kit with a 76mm 81 a/r housing turbo.

i can pick up a basically new eagle 4" crank for $450

so honestly, would it benefit me to just stroke it to a 402 or would that mean more hassle? (bigger turbo? better hot side? etc.)

this is for a STREET car. who cares about my 1/4mile times. I live in so cal and there are no tracks. i just want a car that kills everything else at a red light.

so what would the pros/cons of stroking this motor be??

[MelScrilla]

with that ar and that small of a turbo i would stick with the stock crank. That ar may be small for a 364 LQ4 IMO. if you had a 402 you might spool the turbo on idle. It would be great for smokey burnout shows and short runs but would probably not support a 402 over 5 or 6k rpms.

on another note I'll take the crank for 450 :-)

[KILLER-LS1]

haha well ill get a bigger turbo if i have to.... anyone else running a similar combo?

[RS_SS69]

Thats a little small of a turbo for the 408, im running stock cubes and an GT-88, but im going to be pushing around 20psi. Id say leave the stock cubes and go at it with the same turbo you have.

[KILLER-LS1]

yeah im really looking for the pros and cons of a stroker 408 for a turbo. i can upgrade the turbo if i have to

[MelScrilla]

Originally Posted by KILLER-LS1

yeah im really looking for the pros and cons of a stroker 408 for a turbo. i can upgrade the turbo if i have to

theres no cons really. the only con would be not having a turbo that matches your cubes.

I say go for the 408 and a monster 91mm turbo if thats not a problem. Since your kit probably comes with a t4 flange the biggest you may be able to go is a 88mm turbo which would still be bad ass.

Matching the turbo is important because to small and you have a stump pulling truck motor(alot of low end instant tq and hp but no top end), and to big you only have an all out drag motor(spools to slow and almost has no use on the street).

[transamfreak01]

Originally Posted by MelScrilla

theres no cons really. the only con would be not having a turbo that matches your cubes.

I say go for the 408 and a monster 91mm turbo if thats not a problem. Since your kit probably comes with a t4 flange the biggest you may be able to go is a 88mm turbo which would still be bad ass.

Matching the turbo is important because to small and you have a stump pulling truck motor(alot of low end instant tq and hp but no top end), and to big you only have an all out drag motor(spools to slow and almost has no use on the street).

he wants a street car. he should not get a 91mm turbo. my advice is to get a st80 or 85 at most

[KILLER-LS1]

Originally Posted by transamfreak01

he wants a street car. he should not get a 91mm turbo. my advice is to get a st80 or 85 at most

exactly. I need to stick with a T4 flange as well, so that limits my turbo choices...

you know the old saying, "theres no replacement for displacent" is really stuck in my head right now... i think im going to do it, and stick with the 76mm just to see how it runs.. and if its chocking out, ill get a new one. if it doesnt choke out, but spools at 800 rpm, even better

[TheFallen]

76mm on a 364 is a good street combo. 402 would end up costing you more then you really want.

[KILLER-LS1]

Originally Posted by TheFallen

76mm on a 364 is a good street combo. 402 would end up costing you more then you really want.

who said money was the problem? im going to spend a decent amount of money anyways, the only difference is a crank and maybe needing a bigger turbo..

[TheFallen]

Originally Posted by KILLER-LS1

who said money was the problem? im going to spend a decent amount of money anyways, the only difference is a crank and maybe needing a bigger turbo..

didnt say money, was referring to everything

[mcmillion]

So money is not an option. You got the crank and you don't mind buying a new turbo. I really don't see any reason not to stroke it.

[98Z28CobraKiller]

Originally Posted by transamfreak01

my advice is to get a st80 or 85 at most

With a 408? Why?

[KILLER-LS1]

yeah, basically i have heard something about increased stress on the piston skirts since the stroke is longer... i have no idea if thats true...

[98Z28CobraKiller]

Originally Posted by KILLER-LS1

yeah, basically i have heard something about increased stress on the piston skirts since the stroke is longer... i have no idea if thats true...

It's actually piston rock at the bottom of the stroke. The piston comes so far out of the bottom of the bore coupled with the tapper of the piston can cause the piston to rock, beat up the skirts and drink oil. There has been lots of debate about this and many of the engine builders will tell you that they have built thousands of 4" stroke setups without issue. It's hard to argue with that but I have personally seen it twice with my stroker motors and I wont use a 4" stroke again.

[boosted4life]

If money isn't the issue, stroke the piss out of it and put the biggest turbo you can find on it.

[Jimmy P]

who said money was the problem?

One would assume that money is a problem since you are using the Ebay kit lol..But on a serious note, I would stroke it and just use a bigger turbo.

[KILLER-LS1]

Originally Posted by Jimmy P

One would assume that money is a problem since you are using the Ebay kit lol..But on a serious note, I would stroke it and just use a bigger turbo.

haha i used it for the hotside, everything else i made... anyways so far i think im going to hone .005" over with the 4" stroke and it should be at 403.1 cubic inches. edelbrock PRO-PORT heads with a custom full CNC by west coast racing cylinder heads with 75cc combustion chambers. depending on the piston, im going to try and get the comp. ratio in the mid nines. should be around 800hp on moderate boost how does that sound?

[KILLER-LS1]

oh yeah and ARP head studs, main studs, flywheel bolts, pressure plate bolts, & intake & exhaust manifold bolts!