[Joshinator99]

Originally Posted by EDFHOBBIES

Yes 6 or 7 psi is all you can do probably because compression is so high. The lt4 may be 9.4 lbs but the Maggie 2300 probably flows more so I'm not wrapped up in total boost its making, rather that which will make more hp on 93 only..

Yes.. boost is irrelevant though in my question and build watching generalizations ..I'm talking 93 octane limit and amount of HP that can be achieved on 93 octane with 11:1 or 9:1..

Take for instance this build 720 rwhp w cam and lt4 fuel parts. I've seen this combo make 800 on a lt4 w a cam.. different profile of cam but same fuel ystem...

Different cams will play a big role, since it affects dynamic compression ratio. Static compression takes a backseat to dynamic compression when it comes to determining how much power an engine makes. Furthermore, the difference in cam profiles will affect cylinder pressures as well, impacting when you will hit the octane limit. So unless you run the exact same cam in both engines, it’s not really a straight CR-to-CR comparison IMO.

[Drsagacity]

Originally Posted by EDFHOBBIES

Yes 6 or 7 psi is all you can do probably because compression is so high. The lt4 may be 9.4 lbs but the Maggie 2300 probably flows more so I'm not wrapped up in total boost its making, rather that which will make more hp on 93 only..

Yes.. boost is irrelevant though in my question and build watching generalizations ..I'm talking 93 octane limit and amount of HP that can be achieved on 93 octane with 11:1 or 9:1..

Take for instance this build 720 rwhp w cam and lt4 fuel parts. I've seen this combo make 800 on a lt4 w a cam.. different profile of cam but same fuel system...

Your logic seems flawed. You are attributing the performance to the LT1 vs. LT4, but you aren't accounting for other variables: tune itself, cam profile, # of boost, dyno differences, etc. Simply put your regression analysis has some holes in it.

Who is running 800whp on the Whipple on 93? I know @Ricco is, but he's also running Alky injection and an auxiliary fuel system. Once we can get back to tuning, I will do the same. We just ran out of time this year.


It seems to me that in reality, the LT4 is better as a platform because it's already forged. It means you can run more boost without concerns of blowing up...It also makes sense that at some extreme, let's say over 700whp where very few cars get...yes, lower compression ratio will allow more boost and that will provide more power. At the same time, when LT1's want to get crazy, they will already be adding cam and pistons which allows the ability to lower compression anyway. At that point, there would be no difference between the motors.

[JANNETTYRACING]

Originally Posted by Jhunsberger

Fantastic #'s and build Ted, nice work as always!

Thank you sir.

Originally Posted by EDFHOBBIES

There is no way 40 or 50 psi on 93..lol race or c16 I believe

I'm just comparing seeing lt4 builds with aux pumps only and larger blowers making more power than a LT1 with same size blower and LT4 fuel parts.

Lt1s are around 650 where the lt4s 700s..

For instance bolt a whipple on a LT1 even with the lt4 fuel upgrades they make about 630 to 650..

Bolt the whipple on the LT4 and its 700 to 710

93 only, no cam upgrades....no meth.. not the same psi just where the octane limit is

Who said anything about 93 with 40-50 psi?

[JANNETTYRACING]

Originally Posted by EDFHOBBIES

Of course the compression is almost 2 points higher.. I'm asking if a lower compression lt1 has the potential to make more power on 93 if the compression was lower vs the alternative of adding meth or e85.

Let's say the octane limit on 93 was 9.5 psi and I made 720 rwhp and that is near 11:1 but then I add LT4 heads and my compression drops to 9.5:1 now i make 800 15 psi on 93?

Correct or not i see that on the lt4's

The reason I ask is that I will have a set of LT4 heads off my car.. Do I stick them on hears or sale?

we had this conversation on the phone I don't believe for a minute anyone is making 800 on 93 with no octane booster meth or mix if race gas or mix of E-85

[steelheadrob]

Ted, I am always impressed with this combination.

I recall you doing some testing with some variance of e85 with this package. Can you remind of the result you saw with higher E content. HP/TQ/Boost.

How much boost with higher ethanol fuel are you comfortable running without going to drop in pistons?

If i recall correctly Drsag is running 12psi of boost on E70ish at 760hp but he has drop in pistons.

[laynlo15]

Man 93 and 800 rwhp would be awesome. However its pretty unrealistic. Hello detonation at 15 lbs and the kiss of death for just about everything in side the motor.

[JANNETTYRACING]

Originally Posted by steelheadrob

Ted, I am always impressed with this combination.

I recall you doing some testing with some variance of e85 with this package. Can you remind of the result you saw with higher E content. HP/TQ/Boost.

How much boost with higher ethanol fuel are you comfortable running without going to drop in pistons?

If i recall correctly Drsag is running 12psi of boost on E70ish at 760hp but he has drop in pistons.

Thank you sir,

Yes sir we found the limits of the fuel system right around 750 RWHP on E-60

Ted.

[Drsagacity]

Originally Posted by steelheadrob

Ted, I am always impressed with this combination.

I recall you doing some testing with some variance of e85 with this package. Can you remind of the result you saw with higher E content. HP/TQ/Boost.

How much boost with higher ethanol fuel are you comfortable running without going to drop in pistons?

If i recall correctly Drsag is running 12psi of boost on E70ish at 760hp but he has drop in pistons.

I actually went back with a little cooler air...picked up 10 whp/torque.

12psi - 775whp/740tq @e70

I have drop in pistons.

[steelheadrob]

Smart money seems to says to do the cam and forge pistons at the same time. Which is probably ultimately where I will end up. I just debate how far I can go with E60ish on boost and a cam and stay is a relatively safe zone.

Drsag did you do any testing on 10psi boost or under on e70?

Ted on the 750hp on e60 how much boost and timing were you running?

Thanks

[laynlo15]

Parts cost the same but the labor comes back to bite you not doing them together.

[JANNETTYRACING]

Originally Posted by steelheadrob

Smart money seems to says to do the cam and forge pistons at the same time. Which is probably ultimately where I will end up. I just debate how far I can go with E60ish on boost and a cam and stay is a relatively safe zone.

Drsag did you do any testing on 10psi boost or under on e70?

Ted on the 750hp on e60 how much boost and timing were you running?

Thanks

You are correct, we gave the customer the option but declined due to lack of funds to cover the additional cost.

I am sorry timing is not something I discuss due to liability people take what I say literally.

10.5 psi.

Ted.

[laynlo15]

That they do, mouths open and ears hear something different. No wonder women complain about their men not hearing things they say. Haha

[Drsagacity]

Originally Posted by steelheadrob

Smart money seems to says to do the cam and forge pistons at the same time. Which is probably ultimately where I will end up. I just debate how far I can go with E60ish on boost and a cam and stay is a relatively safe zone.

Drsag did you do any testing on 10psi boost or under on e70?

Ted on the 750hp on e60 how much boost and timing were you running?

Thanks

Yes sir. We did all sorts of testing at 8, 10 and 12psi. Started testing 14 psi, but that’s when I ran out of injector.

I dialed it back to 10psi for winter. Truthfully, it was an accident, I thought I grabbed the 85mm pulley, but I grabbed the 80mm.

I can approximate HP ratings because my logs have calculated HP/TQ

My final tune works beautifully from 8-12psi.

[steelheadrob]

Originally Posted by JANNETTYRACING

You are correct, we gave the customer the option but declined due to lack of funds to cover the additional cost.

I am sorry timing is not something I discuss due to liability people take what I say literally.

10.5 psi.

Ted.

Thanks Ted, No worries on the timing question.

I was more trying to understand the when you move from 93 to e60 how much of the pick up in hp is due to additional boost vs additional timing. If the 15-20 hp for every psi of boost holds true looks like the difference is timing which I am a guessing is a couple of degrees.