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Can you give me a WHP Prediction with this combo?

Old 01-10-2019, 06:51 PM
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samwint77
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Default Can you give me a WHP Prediction with this combo?

Grandsport A8 bone stock baselined at 371 / 389. I'm adding a maggy with the 3" pulley, texas speedway long tube headers and x pipe without cats, lt4 fuel pump and injectors, and a voltage booster for the low side.

I'll post the number when it gets out and see whos closest. lol
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Old 01-10-2019, 08:48 PM
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Originally Posted by samwint77 View Post
Grandsport A8 bone stock baselined at 371 / 389. I'm adding a maggy with the 3" pulley, texas speedway long tube headers and x pipe without cats, lt4 fuel pump and injectors, and a voltage booster for the low side.

I'll post the number when it gets out and see whos closest. lol
Are you thinking about the 75mm pulley with the Maggie? Do you have forged internals? Are you planning to add the cam with a larger fuel lobe at the same time? Are you adding e85 or alky injection?

When you say you are adding the LT4 fuel pump, are you saying the high pressure pump or the low pressure in-tank pump?

Last edited by hogurt; 01-10-2019 at 10:21 PM.
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Old 01-10-2019, 11:05 PM
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Originally Posted by hogurt View Post

Are you thinking about the 75mm pulley with the Maggie? Do you have forged internals? Are you planning to add the cam with a larger fuel lobe at the same time? Are you adding e85 or alky injection?

When you say you are adding the LT4 fuel pump, are you saying the high pressure pump or the low pressure in-tank pump?
I believe its the 80mm. Internals are stock. Cam will be done in the 2nd phase when I change the pistons. I'm going to add e85 around march and a throttle body to probably.
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Old 01-11-2019, 01:43 AM
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Originally Posted by samwint77 View Post
I believe its the 80mm. Internals are stock. Cam will be done in the 2nd phase when I change the pistons. I'm going to add e85 around march and a throttle body to probably.
Doing a little math::
98mm @5psi 540whp
95mm @7psi 570whp (LT1 fuel limit)
90mm @9 psi 600whp
85mm @11psi 630whp
80mm @13psi 660whp (93 octane limit)
75mm @15psi 690whp
70mm @17psi 720whp

So, you will likely be between 630-660whp and you will be at the 93 octane limit.

Once you add a cam with e85 it really changes things. As an example, you could run just over 700whp with e85 @8psi (on the 85mm pulley). It's awesome! Less effort, stress on the car and bam, great results.
It looks a little different and obviously the cam profile matters. I went with the Jannetty Racing - JRE Super Street Brawler package (and went forged).
85mm 8psi with e85 pump (e70) - 715whp
80mm 10psi 745whp
75mm 12psi - 776whp
70mm 14psi - out of fuel injector on e70. . .and ran out of time to continue tuning because of the weather.
We will do some tweaking when the weather gets nice again and we will likely be in the 820-850whp range running 14-15psi. I haven't decided on my path to address injector (bigger injectors, race fuel, alky injection).

All I can say is this, get ready for some new rubber because this journey, my friend, ends up with a seriously beastly ride. Looking forward to your progress. Can't wait to watch.
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Old 01-11-2019, 09:10 AM
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Originally Posted by hogurt View Post
Doing a little math::
98mm @5psi 540whp
95mm @7psi 570whp (LT1 fuel limit)
90mm @9 psi 600whp
85mm @11psi 630whp
80mm @13psi 660whp (93 octane limit)
75mm @15psi 690whp
70mm @17psi 720whp

So, you will likely be between 630-660whp and you will be at the 93 octane limit.

Once you add a cam with e85 it really changes things. As an example, you could run just over 700whp with e85 @8psi (on the 85mm pulley). It's awesome! Less effort, stress on the car and bam, great results.
It looks a little different and obviously the cam profile matters. I went with the Jannetty Racing - JRE Super Street Brawler package (and went forged).
85mm 8psi with e85 pump (e70) - 715whp
80mm 10psi 745whp
75mm 12psi - 776whp
70mm 14psi - out of fuel injector on e70. . .and ran out of time to continue tuning because of the weather.
We will do some tweaking when the weather gets nice again and we will likely be in the 820-850whp range running 14-15psi. I haven't decided on my path to address injector (bigger injectors, race fuel, alky injection).

All I can say is this, get ready for some new rubber because this journey, my friend, ends up with a seriously beastly ride. Looking forward to your progress. Can't wait to watch.
Wow, that makes me a little nervous. I was worried about being over 625, but I don't beat on my car to much. Hopefully the motor lasts for a year or so.
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Old 01-11-2019, 03:33 PM
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Originally Posted by samwint77 View Post
Wow, that makes me a little nervous. I was worried about being over 625, but I don't beat on my car to much. Hopefully the motor lasts for a year or so.
I personally wouldn't push it that far simply because of the LT1 pistons. In my mind, the risk simply doesn't justify pushing it...especially if you are going to go forged anyway.

If you stick with the LT1 fuel system and just add the Maggie, you are going to have 550-580whp on about 7psi. That is perfectly fine on the stock system. Figure it will give you more power than the Z06 from the jump. Then, when you get around to adding pistons, cam, etc you can go crazy. I will tell you, you better plan on new tires at the same time. When we bumped over 800whp, driving at 50, 60, 70mph and slamming the go pedal from 4th gear...it was just lighting the tires up. . .not talking barking, but it was all over the place. That's also when it started to cool off so I decided to hold off until next summer. For me, the best street configuration with the Maggie was running just over 700whp (Cam, Headers, Maggie 85mm @8psi and straight pump e85 with no mixing required). I tested and had the car running up to 776whp with straight pump e85 with no problems. . .but on street tires, no Bueno. Next summer I will have new tires and will decide the best power level.

If it were up to me, in your first phase: 550-580whp with just the Maggie. Low cost add-ins: JMS voltage booster, front crank seal and a catch can.

Second phase: decide on 93 or e85 and build accordingly. Figure on 93octane you will probably hit the octane wall about 650whp so you will either need alky injection or e85 (or race fuel). With e85, the a8 will hit a limit on the low pressure LT4 pump (why you need the voltage booster) after that, you will hit the injector limitation around 800whp. . .so again you can address with bigger injectors FIC injectors are about $3k. You can add alky. You can use race fuel. BAM.

As I said before, I have worked really closely with Ted Jannetty. He is an absolute master for the Maggie and getting it tuned. Since my Camaro is somewhat insane, I am planning to keep my Vette more on the fun, but not obnoxious side. Here's an example of a Vette with just the Maggie:

Last edited by hogurt; 01-11-2019 at 03:45 PM.
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Old 01-11-2019, 07:28 PM
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Originally Posted by hogurt View Post
I personally wouldn't push it that far simply because of the LT1 pistons. In my mind, the risk simply doesn't justify pushing it...especially if you are going to go forged anyway.

If you stick with the LT1 fuel system and just add the Maggie, you are going to have 550-580whp on about 7psi. That is perfectly fine on the stock system. Figure it will give you more power than the Z06 from the jump. Then, when you get around to adding pistons, cam, etc you can go crazy. I will tell you, you better plan on new tires at the same time. When we bumped over 800whp, driving at 50, 60, 70mph and slamming the go pedal from 4th gear...it was just lighting the tires up. . .not talking barking, but it was all over the place. That's also when it started to cool off so I decided to hold off until next summer. For me, the best street configuration with the Maggie was running just over 700whp (Cam, Headers, Maggie 85mm @8psi and straight pump e85 with no mixing required). I tested and had the car running up to 776whp with straight pump e85 with no problems. . .but on street tires, no Bueno. Next summer I will have new tires and will decide the best power level.

If it were up to me, in your first phase: 550-580whp with just the Maggie. Low cost add-ins: JMS voltage booster, front crank seal and a catch can.

Second phase: decide on 93 or e85 and build accordingly. Figure on 93octane you will probably hit the octane wall about 650whp so you will either need alky injection or e85 (or race fuel). With e85, the a8 will hit a limit on the low pressure LT4 pump (why you need the voltage booster) after that, you will hit the injector limitation around 800whp. . .so again you can address with bigger injectors FIC injectors are about $3k. You can add alky. You can use race fuel. BAM.

As I said before, I have worked really closely with Ted Jannetty. He is an absolute master for the Maggie and getting it tuned. Since my Camaro is somewhat insane, I am planning to keep my Vette more on the fun, but not obnoxious side. Here's an example of a Vette with just the Maggie: https://www.facebook.com/jannettyracing/videos/1750704065052717/
Welp....... The headers and x pipe are already on, doh! Guess I'll just have to be mindful and keep it down. I really think just the cam and drop ins will get me where my goals are. I'm ecited and scared a little, but I'll baby her until its time.
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Old 01-11-2019, 08:59 PM
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Originally Posted by samwint77 View Post
Welp....... The headers and x pipe are already on, doh! Guess I'll just have to be mindful and keep it down. I really think just the cam and drop ins will get me where my goals are. I'm ecited and scared a little, but I'll baby her until its time.
That's what I did too so that I could be right about 800whp with no problems.
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Old 01-14-2019, 08:25 AM
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620whp with be the limit of the LT1 stock fueling system
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Old 01-14-2019, 08:52 AM
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Originally Posted by BlueDevilZ51 View Post
620whp with be the limit of the LT1 stock fueling system
Depends on the dyno. With the stock fuel system, we saw the fuel pressure falling off well below 620whp. Technically, the fuel might have been able to make the bare minimum that long, but certainly so wouldn’t have left my car in that position.

Are you saying 620whp with a Maggie, or saying that’s your experience with a different blower setup?
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Old 01-14-2019, 02:04 PM
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Originally Posted by hogurt View Post
That's what I did too so that I could be right about 800whp with no problems.
You saved me some money my friend, thank you. He ordered the 75mm pulley. I'm just going to keep it and use the 95mm for now and stay at 570whp until I'm ready to do my cam and drop ins. Thanks a bunch.
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