Taubr Unit

iTrader: (32)

Im on the fence right now to buy a kit but inbetween on what to buy. Right now its a stock longblock 6.0 with valvetrain, vic jr intake and 60lb injectors. Later on down the road ill eventually build the motor but still nothing CRAZY, just a simple forged 408. Been talking to Josh@Kentucky but i cant decide what route to go. Id like to do the t6/88 kit but the t4/78 is about $1500 cheaper so thats a BIG plus. Just wondering how far i can take the t4/78 or just do the t6/88 now and have it done for a better motor.

Grr

iTrader: (2)

go to the classifieds or racing junk and pick up a GT47-88 for about $1400, problem solved. The 78 is a great turbo and all, but what the hell, i would want a 47-88 on a 408 motor, the 78 would be pretty small and would spool so fast it would be hard to hook anyway

theblur98ss

iTrader: (71)

What is the rest of your fuel systems. 60's aren't gonna support the 88. I'd go for the 88 if that's where you hope to end up anyhow. Do it once....do it right.

Taubr Unit

iTrader: (32)

i have a sumped tank, a1000 pump etc. so im good in that area

VENGEANCE

88....

dudeman

iTrader: (43)

"they" say the 78 is good for 9's and 140+trap speeds.

VENGEANCE

well a 76 is good for that easy on a supra......

"they" will also say it doesnt work that way on an LSx.

ItsNotStock

iTrader: (24)

I was spec'd an 88 by Jose. Look at the people running 88's on this forum, veee8, Mighty Mouse and many others... enough said

Taubr Unit

iTrader: (32)

now is there a big difference between a t6/88 and a t4/88?

dudeman

iTrader: (43)

https://ls1tech.com/forums/forced-in...78-limits.html

ItsNotStock

iTrader: (24)

You're right. I believe Mighty Mouse had the PT88, and vee8 had the Gt47-88 with was a T6 turbo instead of the T4 the PT88 is. I will most likely never come close to pushing the stated 1250 limit. To me that's pushing the limit between a streetable car, and a full on drag car. And if your aim is 85%+ track then from what it seems most people step up to larger turbos.

94dragbird

iTrader: (6)

Wont the PT88 spool faster since it has the smaller T4 housing compared to the bigger T6 housing of the GT47-88?

DrTurbo

iTrader: (3)

No...spool will be the same. Also you can go with the GT88 from Garrett which is the mid-frame version of the GT47-88 and its only 1250 bucks!!

94dragbird

iTrader: (6)

So the GT88 is more comparable to precision's PT88?

B18CYA

iTrader: (17)

400+CI=T6.. A tc78 will make as much if not more power on a 346-364 without all the back presure

b00sted

iTrader: (7)

I know of a similar weight(maybe a little heavier), similar cube car(less than 350ci actually) that went mid-low 9s with a 78. That was with a loose converter and no boost controller. Only 21 psi(as opposed to the 30ish he wanted to run).

78 is perfect for your goals, and would be more fun on the street.

98Z28CobraKiller

iTrader: (17)

And here I was debating as to whether I should have bought my PT88 or held out for a deal on something bigger. I figured that since my turbo came off a V6 GN, it had to be too small.