Twin Turbo Build Question?????

earlsflyincobra · 10-11-2006

I am building a 66 AC Cobra kit. I have a 5.0, bored 30 over, with forged rods and pistons, E303 cam, Y303 heads, and a mildly ported and polished Cobra upper/lower intake. I have 2 Garrett T4 turbos, 2 Tial 38mm waste gates and a 50mm blow off valve, and a Microtech ECU system. I am looking for somewhere around 450 to 500 hp.

The fellow at Stage 6 suggested I downsize the turbot's, since I am not looking for MEGA hp and also since I have a space problem. So, my question is what Turbo's should I use??

I found a Turbo match up chart on allfordmustangs.com and when I put in the info it says to use T3, Comp. trim 45, and Turbine HSG A/R .49. When searching most T3's I find w/trim 45 show .48???? Much difference??

Erich · 10-11-2006

T4s are going to be big. With .60/.63 garretts from pre 87 turbo coupes with manual trans, you will be able to make over 500 hp. The auto version may work too. I run 87-88 turbo coupe IHI units. I make 400 rwhp 500 ft-lb on GT40P headed stock cammed motor with stock intake. The IHIs spool really fast but supposedly top out at like 5-6 grand. They are small too.
Erich

earlsflyincobra · 10-12-2006

Just realized this probably should have been under the Turbo Talk section rather than here...if there is a moderator reading this, can you move it for me..>Thanks, Earl

Erich · 10-12-2006

I'm a moderator but somehow I can't move the thread.
Erich

91saleentwinturbo · 10-12-2006

t4 turbos willl be fine as long as you maintain a low boost no more than 10-15 lbs of boost.

1 clean notch · 12-08-2006

I agree... T4's are a perfect match for a twin setup on a 302. Do you know what the specs are on the turbo's? T4 is pretty vague... Ask Deuce about his twin 44's on his street car... That thing was sick, and made more than enough power.

$hawn · 12-08-2006

Just be careful your existing motor doesn't have too high of A c/r.

89GT2.3H · 04-14-2007

Hey you just have 2 4 bangers sharing the same crank

shaft.
WHY NOT post here?

J&SPolishing · 04-14-2007

Personally I would not do twin t4's. Cobra replicas are very light cars and don't need alot of power to make go fast. Contact Precision Turbo and have them set you with the proper turbos.

One of the t4's you have will probably put you over your horsepower goal. A low dollar MPt70 will make 500hp all day long on a 5.0 with heads and cam.

10-11-2006	#1 (permalink)
earlsflyincobra Too Ancient for JM Status Join Date: Oct 2006 Location: Daytona Beach Posts: 12 iTrader: (0) Friends: (1) Last Online: 03-31-2010 09:59 AM Time Spent Online: 37 Minutes 52 Seconds My Album's: earlsflyincobra's album Thanks: 0 Thanked 0 Times in 0 Posts	Twin Turbo Build Question????? I am building a 66 AC Cobra kit. I have a 5.0, bored 30 over, with forged rods and pistons, E303 cam, Y303 heads, and a mildly ported and polished Cobra upper/lower intake. I have 2 Garrett T4 turbos, 2 Tial 38mm waste gates and a 50mm blow off valve, and a Microtech ECU system. I am looking for somewhere around 450 to 500 hp. The fellow at Stage 6 suggested I downsize the turbot's, since I am not looking for MEGA hp and also since I have a space problem. So, my question is what Turbo's should I use?? I found a Turbo match up chart on allfordmustangs.com and when I put in the info it says to use T3, Comp. trim 45, and Turbine HSG A/R .49. When searching most T3's I find w/trim 45 show .48???? Much difference??

10-11-2006	#2 (permalink)
Erich Moderator Join Date: Aug 2006 Location: MD Posts: 235 iTrader: (0) Friends: (0) Last Online: 04-05-2010 01:38 PM Time Spent Online: 10 Minutes 55 Seconds My Album's: Erich's album My Garage: Erich's Garage Thanks: 0 Thanked 0 Times in 0 Posts	T4s are going to be big. With .60/.63 garretts from pre 87 turbo coupes with manual trans, you will be able to make over 500 hp. The auto version may work too. I run 87-88 turbo coupe IHI units. I make 400 rwhp 500 ft-lb on GT40P headed stock cammed motor with stock intake. The IHIs spool really fast but supposedly top out at like 5-6 grand. They are small too. Erich __________________ 1989 Notch 5.0 homebuilt twin turbo 1997 GT 248a ATI Procharger P600B Intercooled

10-12-2006	#5 (permalink)
91saleentwinturbo Gold Member Join Date: Oct 2006 Posts: 232 iTrader: (0) Friends: (2) Last Online: 04-30-2010 05:57 PM Time Spent Online: 58 Minutes 47 Seconds My Album's: 91saleentwinturbo's album Thanks: 0 Thanked 0 Times in 0 Posts	t4 turbos willl be fine as long as you maintain a low boost no more than 10-15 lbs of boost. __________________ tire roaster

12-08-2006	#7 (permalink)
$hawn nem·e·sis Join Date: Aug 2006 Location: Florida Posts: 149 iTrader: (0) Friends: (1) Last Online: 08-11-2011 09:37 PM Time Spent Online: 5 Minutes 22 Seconds My Album's: $hawn's album My Garage: $hawn's Garage Thanks: 0 Thanked 0 Times in 0 Posts	Just be careful your existing motor doesn't have too high of A c/r. __________________ 10.48 @ 131

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10-12-2006	#3 (permalink)
earlsflyincobra Too Ancient for JM Status Join Date: Oct 2006 Location: Daytona Beach Posts: 12 iTrader: (0) Friends: (1) Last Online: 03-31-2010 09:59 AM Time Spent Online: 37 Minutes 52 Seconds My Album's: earlsflyincobra's album Thanks: 0 Thanked 0 Times in 0 Posts	Just realized this probably should have been under the Turbo Talk section rather than here...if there is a moderator reading this, can you move it for me..>Thanks, Earl

10-12-2006	#4 (permalink)
Erich Moderator Join Date: Aug 2006 Location: MD Posts: 235 iTrader: (0) Friends: (0) Last Online: 04-05-2010 01:38 PM Time Spent Online: 10 Minutes 55 Seconds My Album's: Erich's album My Garage: Erich's Garage Thanks: 0 Thanked 0 Times in 0 Posts	I'm a moderator but somehow I can't move the thread. Erich

12-08-2006	#6 (permalink)
1 clean notch Has the Mustang Bug... Join Date: Dec 2006 Posts: 167 iTrader: (0) Friends: (1) Last Online: 06-20-2008 01:47 PM Time Spent Online: N/A My Album's: 1 clean notch's album My Garage: 1 clean notch's Garage Thanks: 0 Thanked 0 Times in 0 Posts	I agree... T4's are a perfect match for a twin setup on a 302. Do you know what the specs are on the turbo's? T4 is pretty vague... Ask Deuce about his twin 44's on his street car... That thing was sick, and made more than enough power.

04-14-2007	#8 (permalink)
89GT2.3H Goodbye Lil Red. Join Date: Apr 2007 Location: Topeka, Kansas Posts: 454 iTrader: (0) Friends: (3) Last Online: 11-01-2011 12:29 PM Time Spent Online: 1 Day 15 Hours 55 Minutes 43 Seconds My Album's: 89GT2.3H's album My Garage: 89GT2.3H's Garage Thanks: 0 Thanked 0 Times in 0 Posts	Hey you just have 2 4 bangers sharing the same crank shaft. WHY NOT post here?

04-14-2007	#9 (permalink)
J&SPolishing Junior Member Real Name: Jim Join Date: Oct 2006 Posts: 400 iTrader: (0) Friends: (3) Last Online: 9 Hours Ago 10:50 PM Time Spent Online: 3 Days 7 Hours 1 Minute 56 Seconds My Album's: J&SPolishing's album Thanks: 0 Thanked 3 Times in 3 Posts	Personally I would not do twin t4's. Cobra replicas are very light cars and don't need alot of power to make go fast. Contact Precision Turbo and have them set you with the proper turbos. One of the t4's you have will probably put you over your horsepower goal. A low dollar MPt70 will make 500hp all day long on a 5.0 with heads and cam.

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