Options on how to get more power 🤔
Teching In
Joined: Sep 2017
Posts: 1
Likes: 0
I see you are located in Alberta, if you are near Calgary there is supposed to be an E85 pump at G&B Fuels 2623 17 Ave SW, Calgary,
I was going to check it out the next time I am in town.
Let me know if it is true.
I was going to check it out the next time I am in town.
Let me know if it is true.
Joined: Apr 2006
Posts: 3,891
Likes: 1,137
From: Grand Rapids, Michigan
What engine management are you running? Your combo is basically exactly what I'm planning to run, except I have a VS 78/75 billet with a .96 A/R. I've got an LH6 with 243 heads waiting to get yanked out of the donor vehicle. Is your car an auto or manual? I went with a Racetronix twin 510LPH and a full on fuel system replacing all the lines. I'm also going to install a fuel pump booster if these pumps aren't enough, but supposedly they'll handle 1000 HP. Have you considered running a Kenne Bell Boost-A-Pump? One thing you should do, if you haven't, is put a fitting into your hot side pre-turbo to see what kind of backpressure your combo has. I'd be willing to bet it's 2:1 or more. What are you using for boost control? If you have a lot of back pressure, you're going to have a falling boost curve and struggle to get good numbers out of it. One of the big problems with high back pressure combos and using cams like the sloppy stage 2 is the cam has a significant amount of overlap, and if you have 15 PSI in the intake tract and 30 PSI in your exhaust tract, the pressure will try to equalize during the overlap period, sending hot exhaust into the intake tract, diluting the intake charge and heating it up, which makes it more likely to detonate. Installing a more efficient turbo ( larger A/R ) will lower the backpressure and allow you to make more power at the same boost pressure. Turbos are cheap, I'd sell the one you have and upgrade.
What engine management are you running? Your combo is basically exactly what I'm planning to run, except I have a VS 78/75 billet with a .96 A/R. I've got an LH6 with 243 heads waiting to get yanked out of the donor vehicle. Is your car an auto or manual? I went with a Racetronix twin 510LPH and a full on fuel system replacing all the lines. I'm also going to install a fuel pump booster if these pumps aren't enough, but supposedly they'll handle 1000 HP. Have you considered running a Kenne Bell Boost-A-Pump? One thing you should do, if you haven't, is put a fitting into your hot side pre-turbo to see what kind of backpressure your combo has. I'd be willing to bet it's 2:1 or more. What are you using for boost control? If you have a lot of back pressure, you're going to have a falling boost curve and struggle to get good numbers out of it. One of the big problems with high back pressure combos and using cams like the sloppy stage 2 is the cam has a significant amount of overlap, and if you have 15 PSI in the intake tract and 30 PSI in your exhaust tract, the pressure will try to equalize during the overlap period, sending hot exhaust into the intake tract, diluting the intake charge and heating it up, which makes it more likely to detonate. Installing a more efficient turbo ( larger A/R ) will lower the backpressure and allow you to make more power at the same boost pressure. Turbos are cheap, I'd sell the one you have and upgrade.
Stock ecu on hp tuners, scg1 for boost contro
Joined: Apr 2006
Posts: 3,891
Likes: 1,137
From: Grand Rapids, Michigan
That was on pump or E85? How much timing were you running there? Your peak power is REALLY low in the RPM band. Torque/HP crossover is at 5252 RPM, so you're only a couple hundred RPM above that. Get your torque to carry up to 6000-6500, you'll be over 700 RWHP easily. That's why I asked about timing. If you're not adding a bit of timing above 5000 RPM, you're probably leaving power on the table. It would be good to log fuel pressure as well, just to make sure your pump is able to keep up. I'd love to see a boost pressure overlay as well, because I have a feeling you're running into a falling boost curve due to excessive backpressure.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
That was on pump or E85? How much timing were you running there? Your peak power is REALLY low in the RPM band. Torque/HP crossover is at 5252 RPM, so you're only a couple hundred RPM above that. Get your torque to carry up to 6000-6500, you'll be over 700 RWHP easily. That's why I asked about timing. If you're not adding a bit of timing above 5000 RPM, you're probably leaving power on the table. It would be good to log fuel pressure as well, just to make sure your pump is able to keep up. I'd love to see a boost pressure overlay as well, because I have a feeling you're running into a falling boost curve due to excessive backpressure.
Pump gas 94, i kinda thought the same about the low rpm but im nee to this turbo and tuning **** lol i just put it all together, was told around 11 degrees
If the power trended up like it should at higher RPMS, you would be making at least another 100hp if not more.
Joined: Apr 2006
Posts: 3,891
Likes: 1,137
From: Grand Rapids, Michigan
If his tune was carrying 11 degrees all the way out, he's leaving power on the table right there. I'd get it back on the dyno and add 2 degrees above 5000, see if it likes it, and sneak up on 14-15 degrees. This is assuming there's not 3:1 backpressure to boost, however.
If his tune was carrying 11 degrees all the way out, he's leaving power on the table right there. I'd get it back on the dyno and add 2 degrees above 5000, see if it likes it, and sneak up on 14-15 degrees. This is assuming there's not 3:1 backpressure to boost, however.
Exhaust to the back will hurt power a bit, I'd run a cutout too.
What valve springs are you running and intake manifold? I'm surprised to see it not pull up top a bit more. But 643rwhp with a 5.3 and some meth sounds pretty solid.
What valve springs are you running and intake manifold? I'm surprised to see it not pull up top a bit more. But 643rwhp with a 5.3 and some meth sounds pretty solid.
TECH Apprentice
Joined: Nov 2016
Posts: 371
Likes: 18
From: switzerland
you need to know: pressure loss through cooler, air temp pre*/post cooler, boost/backpressure ratio, exhaust temp. otherwise your shooting in the dark. what does the boost curve look like? whats the afr and max iat? 11° points to some fundamental problems of the setup (even more so with meth).
*edit: this with boost pre cooler will give you an indication of what efficiency range your compressor is operating in (find the formula for 100% adiabatic efficiency and compare you temps at 3 points around max. power).
*edit: this with boost pre cooler will give you an indication of what efficiency range your compressor is operating in (find the formula for 100% adiabatic efficiency and compare you temps at 3 points around max. power).
Last edited by Dian; Nov 29, 2022 at 01:11 AM.