Prime Motoring/JrTuned Series 10 FRS 467whp & 357wtq Flex Fuel

[King Tut]

Originally Posted by JuniorAWD

That is a small turbo making about 100ftlbs less then the posted car. You can manipulate TQ curves with boost delivery and timing. If the posted car was only making 250ftlbs I would have easily let it make TQ lower. For the safety of the rods on a car running 18psi I dont just let it hit hard down low... also for traction you dont want a huge hit of tq/power all down low.

Fair enough explanation to me. Not the way I would want my car tuned, but it is all about what the customer wants. I am guessing these are drag racing cars. Any chance we can see a boost plot of this car? I would like to see what the curve looks like.

[JuniorAWD]

Originally Posted by King Tut

Fair enough explanation to me. Not the way I would want my car tuned, but it is all about what the customer wants. I am guessing these are drag racing cars. Any chance we can see a boost plot of this car? I would like to see what the curve looks like.

If I told you that your car will kick a rod because I gave it 350ftlbs at 4k, vs a linear curve that will save the motor.... I am sure you would pick the 2nd choice.

Your car on e85 may make 350ftlbs at 4k, you might think that is awesome and fun to drive. I can tell you it wont be, and it will be dangerous from the load you are creating on the motor at such a low RPM.

I try and provide the most within reason, I hate seeing guys come back with holes in their motors because it was pushed to hard. End of the day I am being trusted with your 30-40k build, I want you to enjoy it for as long as possible.

Jr

If you send me an email I will send you some boost plots so you can see

[xxscaxx]

Originally Posted by JuniorAWD

If I told you that your car will kick a rod because I gave it 350ftlbs at 4k, vs a linear curve that will save the motor.... I am sure you would pick the 2nd choice.

Your car on e85 may make 350ftlbs at 4k, you might think that is awesome and fun to drive. I can tell you it wont be, and it will be dangerous from the load you are creating on the motor at such a low RPM.

I try and provide the most within reason, I hate seeing guys come back with holes in their motors because it was pushed to hard. End of the day I am being trusted with your 30-40k build, I want you to enjoy it for as long as possible.

Jr

If you send me an email I will send you some boost plots so you can see

Not to derail this thread, but do you have concerns on say an innovate SC making a good amount of torque down low, almost instant? Granted its not earth shattering, but the load is still high. I'm not talking non-intercooled, talking e85/intercooled (like I will be hehe)

I only ask as it seems you are avoiding this with turbo setups to save the motor (which I agree with you whole-heartedly), but granted they make a lot more torque and probably way more violently with the amount of boost that can be thrown at it lol.

[King Tut]

Originally Posted by JuniorAWD

If I told you that your car will kick a rod because I gave it 350ftlbs at 4k, vs a linear curve that will save the motor.... I am sure you would pick the 2nd choice.

Your car on e85 may make 350ftlbs at 4k, you might think that is awesome and fun to drive. I can tell you it wont be, and it will be dangerous from the load you are creating on the motor at such a low RPM.

I try and provide the most within reason, I hate seeing guys come back with holes in their motors because it was pushed to hard. End of the day I am being trusted with your 30-40k build, I want you to enjoy it for as long as possible.

Jr

If you send me an email I will send you some boost plots so you can see

How many FA20s have you seen kick a rod at 350 ft/lbs at 4000 RPM? Do you have any more details as I am trying to track the forced induction blown motors. What would you say would be a safe amount of torque at 4000 RPM? I will shoot you an e-mail, thanks.

[carbonBLUE]

Originally Posted by King Tut

How many FA20s have you seen kick a rod at 350 ft/lbs at 4000 RPM? Do you have any more details as I am trying to track the forced induction blown motors. What would you say would be a safe amount of torque at 4000 RPM? I will shoot you an e-mail, thanks.

Truth is you should build the motor regardless, I've talk to some of the guys that have been competing on the professional level with this motor boosted and have been noted these things

1) It is a Fantastic engine

2) under 300whp is fine on stock internals on the stock redline for a street car that is occasionally driven hard

3) anything over 300whp you should rebuild the motor

4) They blew up a few blocks doing stress testing by tracking the car

5) built motors last longer on street driven cars aka will last the life of the car with general maintenance or will last at the track for X amount of hours of racing time dependent on power output and supporting mods/tune

6) Not everyone who does testing with FI is on forums or reports every time they bow up an engine.

Most importantly if you want to go turbo for a street car, you want the boost on early and rounding out at about 300whp (at this point you are faster than MOST v8 production cars, think about it...do you really need that much power on the street?)

The last car I had modified had the same power output at 5000 rpms as the stock engine had at 8500 rpms, when you start adding more power you see yourself at redline less often and the power up top is nice to have but really not that usable on the street.

and @JuniorAWD is right 350wtq at 4000 rpms isn't healthy for this engine because of the dimensions of the crank and rods. If you want to make that much power that low, consider using a longer stroke to improve VE from 2.0L to 2.2L or something in that fashion.

[Dan@AWD]

@JuniorAWD nice work!! and on a Mustang Dyno. Throw it on a Dynojet would be about 500hp.