Compound Boost- KB 2.2 and MP70

Dyno Dan · 10-27-2008, 11:37 AM

Hello guys, it's been a while since I've posted on NLOC, so first off a big howdy from Las Vegas.

Since my 02 Lightning doesn't get driven much, I was thinking of switching up the combo and putting it back on the front burner. The truck has 13.5k miles, a KB 2.2 (9.5" lower / 3.25" upper), cat-back, MAFxtender, and PCM tune. The truck makes around 15-16 psi and makes 456-460 rwhp with 16 degrees of timing.

My question is, what size turbo would be required for a compound boost set up with a goal of 500-550 rwhp? My plan was to put the stock lower pulley back on, and run an upper that yields about 8 psi. I would then use a remote mount turbo, like a MP T70 or their new MP T76 with a .96 housing to yield another 7 psi. If I've done my math right, the blower at 8 psi and the turbo at 7 psi would net a total of 18.8 psi. How do I determine where I fall on a compressor map when I'm running compound set up? If a NA 5.4 (331 ci) makes, say 225 rwhp, and then I added 1 atmosphere of boost 14.7 psi, then it should make around 450 rwhp (right about where I'm at). Lowering that to 1/2 the boost, it should make about 340 rwhp (around stock Lightning HP). Is a MP T70 going to be too small? I've run this turbo to 700+ rwhp on a different application (but same 331 ci), but it's "happy spot" was around 650rwhp.

I'm sure some of you will say, "why not just run the KB at 22 psi and make 525 rwhp?" (or whatever it would make). The idea here is to lower the parasitic loss from turning the blower at high RPM's, and then supplement it with the turbo. I would like to see what the power is like running a compound set up at 15-16 psi compared to the blower alone at 15-16 psi.

FMOS Racing · 10-28-2008, 08:26 AM

Hey, Dan!

First off, your math is correct.

So what's your reason for keeping the blower on it? Honestly a turbo alone would make ~550 rwhp at 16 psi without the blower.

I've never seen a compressor map for MP T70, but a T76 would get you what you're looking for. It will move enough airmass at low PR for your application.

Dyno Dan · 10-28-2008, 01:47 PM

Hey Jeff, nice to hear from you, and thanks for the reply.

Well, the quick answer to why I'm keeping the blower on it.....because it's there. I just thought it would be interesting to see what type of gains there would be from running a compound set up, as opposed to a S/C alone (at the same boost). Running a remote mount system should make the plumbing rather easy, and allow me to keep the stock exhaust manifolds and cats in place. I don't intend on running an intercooler between the turbo and the S/C (unless IAT2's get out of control), so that will further ease installation.

I ordered the new MP T76 yesterday, along with a Tial 38mm gate. I hope the 38mm WG can bypass enough exhaust gas energy, and the "P-trim" exhaust isn't a choke on this application. I need to dig up a compressor map on this MP T76 to see where things fall. I ordered it with a .96 exhaust housing, do you think that was the right move?

FMOS Racing · 10-28-2008, 02:40 PM

I think the .96 is a good overall size, maybe a little large for that remote mount, so you'll end up with a little "lag." But with the blower still on there, that may not be all bad. Ought to have quite a top end surge!

timb245 · 10-28-2008, 03:34 PM

Dan- need a tune on mine, PM sent, thanks Tim B.

bumblebzz1 · 12-15-2008, 11:11 PM

Im getting ready to try the same thing ....let us know how it goes.

RyanR · 01-13-2009, 11:07 PM

very interested, keep us updated

FlaHP · 01-14-2009, 11:43 AM

My buddy has done a few compound boost projects.

You get the advantage of the power coming on like a SC and the HP of the turbo.

He has been doing it on Ford GTs

FlaHP · 01-14-2009, 11:45 AM

here is a thread

Compound boost 1359whp 1219wtq TTSC Ford GT

RyanR · 01-17-2009, 02:11 PM

I've seen that vid before, impressive.. I want to see an L with around 7 to 800 hp with a compound setup and would like to see it done with a stock/ported heaton as the SC. Thats kinda what I'm after if i do run with this

getblown · 01-19-2009, 05:09 PM

The compound setup is great!!! The best part is you can run a turbo that is about twice as larger as you normally could spin efficently on your motor and the boost from your blower and increased exhaust will bring the lag down and spool it up real fast. 550 rwhp is very conservative, as the boost multiplies going from the turbo into the blower. Check out the hellion 03-04 corba kits. They run up to 40 psi on a stock motor.

Krwy · 01-22-2009, 09:26 PM

I've even been thinking about this type of setup. I wanted to run a rear mount MP70 w/ a Precision Turbos .81 a/r and pull the stock Eaton. A stock pullied, ported Eaton and a rear mount MP70 w/ a .96 a/r at 15psi would pull like a frieght train all the way to redline. Anyone want to be guinea pig?

There are a TON of Chevy 1500 guys running around with STS rear mounts t62's making 450+ to the wheels and blowning the tires at the hit of the throttle.

10-27-2008, 11:37 AM	#1 (permalink)
Dyno Dan Registered User Join Date: Feb 2000 Location: Las Vegas Posts: 108 View this user's gallery iTrader: 0 / 0%	Compound Boost- KB 2.2 and MP70 Hello guys, it's been a while since I've posted on NLOC, so first off a big howdy from Las Vegas. Since my 02 Lightning doesn't get driven much, I was thinking of switching up the combo and putting it back on the front burner. The truck has 13.5k miles, a KB 2.2 (9.5" lower / 3.25" upper), cat-back, MAFxtender, and PCM tune. The truck makes around 15-16 psi and makes 456-460 rwhp with 16 degrees of timing. My question is, what size turbo would be required for a compound boost set up with a goal of 500-550 rwhp? My plan was to put the stock lower pulley back on, and run an upper that yields about 8 psi. I would then use a remote mount turbo, like a MP T70 or their new MP T76 with a .96 housing to yield another 7 psi. If I've done my math right, the blower at 8 psi and the turbo at 7 psi would net a total of 18.8 psi. How do I determine where I fall on a compressor map when I'm running compound set up? If a NA 5.4 (331 ci) makes, say 225 rwhp, and then I added 1 atmosphere of boost 14.7 psi, then it should make around 450 rwhp (right about where I'm at). Lowering that to 1/2 the boost, it should make about 340 rwhp (around stock Lightning HP). Is a MP T70 going to be too small? I've run this turbo to 700+ rwhp on a different application (but same 331 ci), but it's "happy spot" was around 650rwhp. I'm sure some of you will say, "why not just run the KB at 22 psi and make 525 rwhp?" (or whatever it would make). The idea here is to lower the parasitic loss from turning the blower at high RPM's, and then supplement it with the turbo. I would like to see what the power is like running a compound set up at 15-16 psi compared to the blower alone at 15-16 psi.

10-28-2008, 01:47 PM	#3 (permalink)
Dyno Dan Registered User Join Date: Feb 2000 Location: Las Vegas Posts: 108 View this user's gallery iTrader: 0 / 0%	Hey Jeff, nice to hear from you, and thanks for the reply. Well, the quick answer to why I'm keeping the blower on it.....because it's there. I just thought it would be interesting to see what type of gains there would be from running a compound set up, as opposed to a S/C alone (at the same boost). Running a remote mount system should make the plumbing rather easy, and allow me to keep the stock exhaust manifolds and cats in place. I don't intend on running an intercooler between the turbo and the S/C (unless IAT2's get out of control), so that will further ease installation. I ordered the new MP T76 yesterday, along with a Tial 38mm gate. I hope the 38mm WG can bypass enough exhaust gas energy, and the "P-trim" exhaust isn't a choke on this application. I need to dig up a compressor map on this MP T76 to see where things fall. I ordered it with a .96 exhaust housing, do you think that was the right move? __________________ --2002 Black L-- NLOC #1476, KB'd Stock motor

12-15-2008, 11:11 PM	#6 (permalink)
bumblebzz1 1999-391/513 2001 -TBD Join Date: Dec 2008 Location: NC Posts: 143 View this user's gallery iTrader: 0 / 0%	small world Im getting ready to try the same thing ....let us know how it goes.

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10-28-2008, 08:26 AM	#2 (permalink)
FMOS Racing Vrrooooooooooom Join Date: Jan 2000 Location: Indianapolis, IN Posts: 12,398 View this user's gallery iTrader: 3 / 100%	Hey, Dan! First off, your math is correct. So what's your reason for keeping the blower on it? Honestly a turbo alone would make ~550 rwhp at 16 psi without the blower. I've never seen a compressor map for MP T70, but a T76 would get you what you're looking for. It will move enough airmass at low PR for your application.

10-28-2008, 02:40 PM	#4 (permalink)
FMOS Racing Vrrooooooooooom Join Date: Jan 2000 Location: Indianapolis, IN Posts: 12,398 View this user's gallery iTrader: 3 / 100%	I think the .96 is a good overall size, maybe a little large for that remote mount, so you'll end up with a little "lag." But with the blower still on there, that may not be all bad. Ought to have quite a top end surge!

10-28-2008, 03:34 PM	#5 (permalink)
timb245 Registered User Join Date: Oct 2004 Location: LAS VEGAS Posts: 295 View this user's gallery iTrader: 3 / 100%	Dan- need a tune on mine, PM sent, thanks Tim B.

01-13-2009, 11:07 PM	#7 (permalink)
RyanR Registered User Paid Member Join Date: May 2008 Location: Star City, Arkansas Posts: 236 NLOC member #: 2621 View this user's gallery iTrader: 0 / 0%	very interested, keep us updated

01-14-2009, 11:43 AM	#8 (permalink)
FlaHP Registered User Join Date: Nov 2003 Location: Gainesville, Florida Posts: 1,781 View this user's gallery iTrader: 4 / 100%	My buddy has done a few compound boost projects. You get the advantage of the power coming on like a SC and the HP of the turbo. He has been doing it on Ford GTs

01-14-2009, 11:45 AM	#9 (permalink)
FlaHP Registered User Join Date: Nov 2003 Location: Gainesville, Florida Posts: 1,781 View this user's gallery iTrader: 4 / 100%	here is a thread Compound boost 1359whp 1219wtq TTSC Ford GT

01-17-2009, 02:11 PM	#10 (permalink)
RyanR Registered User Paid Member Join Date: May 2008 Location: Star City, Arkansas Posts: 236 NLOC member #: 2621 View this user's gallery iTrader: 0 / 0%	I've seen that vid before, impressive.. I want to see an L with around 7 to 800 hp with a compound setup and would like to see it done with a stock/ported heaton as the SC. Thats kinda what I'm after if i do run with this

01-19-2009, 05:09 PM	#11 (permalink)
getblown Registered User Join Date: Apr 2008 Posts: 5 View this user's gallery iTrader: 0 / 0%	The compound setup is great!!! The best part is you can run a turbo that is about twice as larger as you normally could spin efficently on your motor and the boost from your blower and increased exhaust will bring the lag down and spool it up real fast. 550 rwhp is very conservative, as the boost multiplies going from the turbo into the blower. Check out the hellion 03-04 corba kits. They run up to 40 psi on a stock motor.

01-22-2009, 09:26 PM	#12 (permalink)
Krwy Registered User Join Date: Feb 2008 Posts: 50 View this user's gallery iTrader: 0 / 0%	I've even been thinking about this type of setup. I wanted to run a rear mount MP70 w/ a Precision Turbos .81 a/r and pull the stock Eaton. A stock pullied, ported Eaton and a rear mount MP70 w/ a .96 a/r at 15psi would pull like a frieght train all the way to redline. Anyone want to be guinea pig? There are a TON of Chevy 1500 guys running around with STS rear mounts t62's making 450+ to the wheels and blowning the tires at the hit of the throttle.