Injector size correction when adding meth
Thread Starter
Drifting
Joined: Aug 2017
Posts: 1,926
Likes: 359
From: Dayton, OH
Injector size correction when adding meth
I am looking at changing from a 3.6" to a 3.4" pulley. Made 677 HP\633 TQ with meth. V-3 Si, LS3.
Pretty sure the injectors are 60#. Will they support running a 3.4"?
677 / .85 = 796 HP
I have looked at several online calculators for injector sizing and 800 HP for a supercharged application at 90% duty cycle seems to be the upper end.
Does the meth burning add any of the HP?
Thanks!!!
Pretty sure the injectors are 60#. Will they support running a 3.4"?
677 / .85 = 796 HP
I have looked at several online calculators for injector sizing and 800 HP for a supercharged application at 90% duty cycle seems to be the upper end.
Does the meth burning add any of the HP?
Thanks!!!
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
Also make sure you’re factoring in whether you’re using a static fuel pressure like the factory setup or not. If it’s like factory then 10psi boost and 58psi fuel pressure means an effective fuel pressure or 48psi which will obviously bring flow rates down
Racer
Joined: Nov 2019
Posts: 452
Likes: 51
I am looking at changing from a 3.6" to a 3.4" pulley. Made 677 HP\633 TQ with meth. V-3 Si, LS3.
Pretty sure the injectors are 60#. Will they support running a 3.4"?
677 / .85 = 796 HP
I have looked at several online calculators for injector sizing and 800 HP for a supercharged application at 90% duty cycle seems to be the upper end.
Does the meth burning add any of the HP?
Thanks!!!
Pretty sure the injectors are 60#. Will they support running a 3.4"?
677 / .85 = 796 HP
I have looked at several online calculators for injector sizing and 800 HP for a supercharged application at 90% duty cycle seems to be the upper end.
Does the meth burning add any of the HP?
Thanks!!!
Thread Starter
Drifting
Joined: Aug 2017
Posts: 1,926
Likes: 359
From: Dayton, OH
"Stock pump with a BAP?" That sounds like a fuel system question. No BAP. I didn't find anything in the receipts to indicate any change or upgrade to the fuel system. It would be necessary to have larger fuel injectors to make 677 HP. I assume the fuel injectors are 60#.
I was under the mistaken impression that the fuel system was 43.5 PSI. I found out it is 60 PSI so if the injectors are 60#\hr they are ok.
Racer
Joined: Nov 2019
Posts: 452
Likes: 51
The AlkyControl kit was installed on the car when I bought it. I don't know the particulars.
"Stock pump with a BAP?" That sounds like a fuel system question. No BAP. I didn't find anything in the receipts to indicate any change or upgrade to the fuel system. It would be necessary to have larger fuel injectors to make 677 HP. I assume the fuel injectors are 60#.
I was under the mistaken impression that the fuel system was 43.5 PSI. I found out it is 60 PSI so if the injectors are 60#\hr they are ok.
"Stock pump with a BAP?" That sounds like a fuel system question. No BAP. I didn't find anything in the receipts to indicate any change or upgrade to the fuel system. It would be necessary to have larger fuel injectors to make 677 HP. I assume the fuel injectors are 60#.
I was under the mistaken impression that the fuel system was 43.5 PSI. I found out it is 60 PSI so if the injectors are 60#\hr they are ok.
BAP I meant as a Boost A Pump
And what is your entire car setup? I have a V3 SI as well and I like those numbers. Cam too? Full exhaust?
Thread Starter
Drifting
Joined: Aug 2017
Posts: 1,926
Likes: 359
From: Dayton, OH
Yes, I assumed "BAP" as "Boost A Pump". I understood the BAP to be a fuel pump booster. Is that not what you are saying?
Yes, Comp Cams cam and with trunnion upgrade and springs appropriate for the cam.
Long tube 1 7/8ths headers to 3 " exhaust pipes, Borla S-Type mufflers, no Cats.
Factory original throttle body, intake manifold, and heads other than as mentioned above.
Intake and air filter are A&A from 2012.
A few weeks ago I had a few pulls done just to check the tune. He said is was ok to run it but it was rich and could be improved. 614 HP. It was like 100 degrees in the shop.
I am having the pulley changed from a 3.6 to a 3.4 and a full re-tune done next week.
Yes, Comp Cams cam and with trunnion upgrade and springs appropriate for the cam.
Long tube 1 7/8ths headers to 3 " exhaust pipes, Borla S-Type mufflers, no Cats.
Factory original throttle body, intake manifold, and heads other than as mentioned above.
Intake and air filter are A&A from 2012.
A few weeks ago I had a few pulls done just to check the tune. He said is was ok to run it but it was rich and could be improved. 614 HP. It was like 100 degrees in the shop.
I am having the pulley changed from a 3.6 to a 3.4 and a full re-tune done next week.
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Racer
Joined: Nov 2019
Posts: 452
Likes: 51
Yes, I assumed "BAP" as "Boost A Pump". I understood the BAP to be a fuel pump booster. Is that not what you are saying?
Yes, Comp Cams cam and with trunnion upgrade and springs appropriate for the cam.
Long tube 1 7/8ths headers to 3 " exhaust pipes, Borla S-Type mufflers, no Cats.
Factory original throttle body, intake manifold, and heads other than as mentioned above.
Intake and air filter are A&A from 2012.
A few weeks ago I had a few pulls done just to check the tune. He said is was ok to run it but it was rich and could be improved. 614 HP. It was like 100 degrees in the shop.
I am having the pulley changed from a 3.6 to a 3.4 and a full re-tune done next week.
Yes, Comp Cams cam and with trunnion upgrade and springs appropriate for the cam.
Long tube 1 7/8ths headers to 3 " exhaust pipes, Borla S-Type mufflers, no Cats.
Factory original throttle body, intake manifold, and heads other than as mentioned above.
Intake and air filter are A&A from 2012.
A few weeks ago I had a few pulls done just to check the tune. He said is was ok to run it but it was rich and could be improved. 614 HP. It was like 100 degrees in the shop.
I am having the pulley changed from a 3.6 to a 3.4 and a full re-tune done next week.
Gotcha, my fault for the misunderstanding.
Just seeing your setup and trying to gauge how mine may turn out. I have a 3.8 pulley now. And want to drop down to the 3.4 and add meth. Hopefully that will put me into the 620whp range maybe. Then add my cam down the road.
Advanced
Joined: Sep 2017
Posts: 72
Likes: 15
From: Colorado
Gotcha, my fault for the misunderstanding.
Just seeing your setup and trying to gauge how mine may turn out. I have a 3.8 pulley now. And want to drop down to the 3.4 and add meth. Hopefully that will put me into the 620whp range maybe. Then add my cam down the road.
Just seeing your setup and trying to gauge how mine may turn out. I have a 3.8 pulley now. And want to drop down to the 3.4 and add meth. Hopefully that will put me into the 620whp range maybe. Then add my cam down the road.
Last edited by Bstock; Aug 19, 2020 at 11:55 AM.