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02-10-2009, 01:13 AM
| #1 (permalink) |
| GOT BOOST?? Paid Member  | need some turbo sizing input Ok I am trying to settle in on what next big mod I am gonna do to my truck. Vortec, Single turbo, twin turbo????  I have a PD right now and going vortec would be relatively easy and tune wouldn't have to change much( SD with TwEECeR). Single I can buy a used kit and put it on then get it tuned, sell PD and LT headers, Or Twins--mount them at end of LT headers under truck. What size turbo would you guys do for a single??  what size turbos for twins?? Mods are in my sig thanks guys.Just bouncing around ideas!! |
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02-10-2009, 03:26 AM
| #2 (permalink) |
| Registered User | Turbo sizing depends on if its a daily driver or a weekend track only truck. If it was a daily, I would use a Master Power T70 w/ .96a/r since its a 351. If it was for track duty, a Precision 76 w/ a .81a/r to get it spooling quicker. I really wouldn't bother with twins, its a ton of work for the same amount of power. When I built the twins for my coupe it took forever, and still didn't come out that great. A single MP70 at 13psi would make at least 500rwhp on that truck. It will be a handfull. |
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02-11-2009, 02:21 PM
| #3 (permalink) |
| Registered User  Join Date: Feb 2004 Location: EX vincentown NJ now in Lebanon TN
Posts: 666
View this user's gallery iTrader: 0 / 0%   | I don't now about that. Its a lot Less BS to find room for 2 small turbos then one big one. And it will make more power. 2 T04B or E will make a 1000whp and 1 T76 can only make 800whp. And I've made 600whp and 711wtq on 15# with a stock short block,cam,and intake with trick flow heads. And with 2 turbos there's no lag at all. I've don't it Booth ways and there booth hard to do and take a lot of work. But trying to find room for everything with a singe turbo and leave the front dress was way harder then the twin turbo i built. And its really hard to get a pipe over 3" between the frame and the engine for a down pipe. |
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02-11-2009, 03:44 PM
| #4 (permalink) |
| ALL TALK NO WALK!!!  Join Date: Sep 2007 Location: FRISCO TEXAS!!!!
Posts: 2,005
View this user's gallery iTrader: 0 / 0% | i guess it mattes what the truck is used for... what do you use it for.. and btw i cant see your sig |
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02-11-2009, 03:49 PM
| #5 (permalink) |
| GOT BOOST?? Paid Member | I think I am just going to do the twins this summer like I originally thought about. I will get the Vortec to tide me over. I just haven't seen a single that I like alot, And I want atleast a 3.5 DP if I am going single, I 76GTS is just SOOO much more resposive with a 3.5" or 4" DP and I can't see fittng that size DP without serious modifications and overheating other components. I am gonna do twins at the end of my longtubes near the tailshaft of the trans. Lots of room. Probly 2 MPT70 turbos with .68 turbine housing( on a 414 that I already have) |
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02-11-2009, 04:11 PM
| #6 (permalink) |
| Registered User Join Date: Feb 2004 Location: EX vincentown NJ now in Lebanon TN
Posts: 666
View this user's gallery iTrader: 0 / 0% | You Know your going to have to run a pump for the return oil for the turbos Right? And your going to have a lot more Lag being that far away from the head. You can get a 31/2" down pipe down pipe in there. I have them on mine. But you can't get a 4" there with out using a flat pipe. And yes you will get better resposive with bigger pipe. |
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02-11-2009, 04:16 PM
| #7 (permalink) | |
| ALL TALK NO WALK!!! Join Date: Sep 2007 Location: FRISCO TEXAS!!!!
Posts: 2,005
View this user's gallery iTrader: 0 / 0% | Quote:
def no bigger then 3.5" for the DP... i am kinda worried with the 4" i am going to try to run.. i may end up with a 3.5 also... i think the MP 70s wont be up to the task of a 414 ci motor... i would look elsewhere.... how high you gonna spin it? what are your HP goals.. what you do wanna run??? you wanna be a dyno queen or track whore... do you have enough fuel for 1krwhp? will your heads be up to the task??? how bout your trans and tc??? | |
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02-11-2009, 07:26 PM
| #9 (permalink) |
| ALL TALK NO WALK!!! Join Date: Sep 2007 Location: FRISCO TEXAS!!!!
Posts: 2,005
View this user's gallery iTrader: 0 / 0% | i think you should step up to a 3.5 that would help you more... |
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02-11-2009, 07:41 PM
| #10 (permalink) | |
| Moderator Paid Member  | Quote:
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02-11-2009, 07:48 PM
| #11 (permalink) |
| ALL TALK NO WALK!!! Join Date: Sep 2007 Location: FRISCO TEXAS!!!!
Posts: 2,005
View this user's gallery iTrader: 0 / 0% | lol.. oh well.. just watch your EGT's |
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02-11-2009, 08:37 PM
| #12 (permalink) | |
| Former Skydiving Junkie..  | Quote:
One of PSI Motorsport's 76mm turbo trucks switched from a 3" DP to a 4" and they picked up quite a bit of power. Very worth it and advised from what I've seen.
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02-11-2009, 11:11 PM
| #13 (permalink) |
| Registered User Join Date: Feb 2004 Location: EX vincentown NJ now in Lebanon TN
Posts: 666
View this user's gallery iTrader: 0 / 0% | I went from A 3" down pipes and exhaust to 31/2" down pipes and 4" exhaust and pickup a lot of power. You can get a 4" down pipe in there but your going to have to a oval pipe where the frame is. Or you could run it on the outside of the frame. And kill it at the tire.
__________________ Twiceblown two turbos and a 393 on pump gas 10Lb of boost= 630RWHP and 700RWTQ = 10.90@127.00 Must done something right |
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