Turbo selection
Jan 24, 2007 | 04:35 PM
#71
Originally Posted by boostedsl2
boost level depends on the timing. you can run crazy boost with not timing, you just won't make any power.
most of my experience comes from four cylinder car, however there shouldn't be a difference as far as tuning goes. an engine is an engine. gas is gas.
there is a difference in ve usually between v8's and 4's, i will admit that, but it shouldn't change the tune.
you may start to ping at 11psi due to your tune. you might be able to run more psi with cooler intake temps, lower compresson and less timing. depends on what you want to do.
you could be right with these engines not being able to take that much boost, but concluding what an engine can and can't do based on just personal experience doesn't do it for me.
i know you make a ton of hp, i've seen the videos. in fact, your videos are one of the reasons i'm switched to trucks.
don't take this as an insult. i'll do a little more research.
sorry for the hi-jack
most of my experience comes from four cylinder car, however there shouldn't be a difference as far as tuning goes. an engine is an engine. gas is gas.
there is a difference in ve usually between v8's and 4's, i will admit that, but it shouldn't change the tune.
you may start to ping at 11psi due to your tune. you might be able to run more psi with cooler intake temps, lower compresson and less timing. depends on what you want to do.
you could be right with these engines not being able to take that much boost, but concluding what an engine can and can't do based on just personal experience doesn't do it for me.
i know you make a ton of hp, i've seen the videos. in fact, your videos are one of the reasons i'm switched to trucks.
don't take this as an insult. i'll do a little more research.
sorry for the hi-jack
a higher ve would make a significant diference on max boost level. with a higher ve the motor will flow a lot more air at a given boost level. more air=more cyl pressure= detonation sooner.
if it were just me seeing low boost limits on pump gas i would agree with you that it could be the tune. on a whipple set up with no intercooler about 6.5psi is all i or anyone else is geting on pump gas. with an intercooled radix it seems like 8-9psi is a prety safe limit before knock sets in. it doesn't take much to get these motors knocking with no boost.
Jan 24, 2007 | 04:45 PM
#72
Thread Starter
High on diesel fumes
iTrader: (70)
Joined: Mar 2005
Posts: 12,658
Likes: 3
From: Phoenix, AZ
Originally Posted by thunder550
Specs on the recommended TO4B:
59mm wheel
Turbine
P trim
.96 A/r housing
Compressor
H trim
.70 A/r housing
59mm wheel
Turbine
P trim
.96 A/r housing
Compressor
H trim
.70 A/r housing
Thoughts on either setup?
Jan 24, 2007 | 05:03 PM
#73
TECH Apprentice
Joined: Jan 2005
Posts: 357
Likes: 0
From: St Petersburg, FL
i used to run 22psi with a t67 in my saturn daily on 93 octane. 8.5:1 though
if that hunk of crap can do it, i'm sure one of these trucks can.
if your going with twins, i would look at twin sc61's with stage 5 wheels.
that should be good for about 1200whp worth of air with decent spool.
if that hunk of crap can do it, i'm sure one of these trucks can.
if your going with twins, i would look at twin sc61's with stage 5 wheels.
that should be good for about 1200whp worth of air with decent spool.
Jan 24, 2007 | 05:24 PM
#74
The MPS line has alot lighter wheels which will help with spool. You got to remember though, its not just the cost of the turbo you are adding with twins, extra wastegate(250), extra piping, log header, flange(400ish), IMO a properly sized single will work best with your setup and easier to package. I really think the S-series may be a better option after talking to Jose today. The new Borg-Warner wheels are more aggresive, which make more power, are louder, more efficient, and make big power. They are on a t-6 flange, and Jose told me that the t-4 blanket will work it just wont cover it as well. He also said the pt-88 technology is 30+ year old turbo technology
whereas the new borg-warner wheels and the s-series turbos are new cutting edge technology so Im sure you can imagine the difference in technology that is put into them. The S80 is going to be ~1600 with a coated exhaust housing.
whereas the new borg-warner wheels and the s-series turbos are new cutting edge technology so Im sure you can imagine the difference in technology that is put into them. The S80 is going to be ~1600 with a coated exhaust housing.
What can you get 60-1's for these days?
Jan 25, 2007 | 11:43 AM
#78
Thread Starter
High on diesel fumes
iTrader: (70)
Joined: Mar 2005
Posts: 12,658
Likes: 3
From: Phoenix, AZ
Jose at forcedinductions is recommending twin TC62's for what I'm wanting, .68a/r and mps trim. I'm thinking I want to make something using stock manifolds flipped to come up and forward, like the w2w single setup. As soon as I figure out this damn oil burning issue I'm going to be ready to jump into the turbo setup 
Jan 25, 2007 | 03:37 PM
#80
TECH Apprentice
Joined: Jan 2005
Posts: 357
Likes: 0
From: St Petersburg, FL
i saw them for a little under $700 apiece. they are about the oldest turbo you can get these days though. you could get some gt journal bearings with similar flow characteristics, but much broader of a map keeping you in the efficency range a lot longer.
twin gt3782's would be a little bit smaller (about 10lb/min less). they about $800 apiece. much better compressor map.
twin gt3782's would be a little bit smaller (about 10lb/min less). they about $800 apiece. much better compressor map.
Last edited by boostedsl2; Jan 25, 2007 at 03:44 PM.