803whp 730wtq naturally aspirated Prefix 9 liter

[Arizona Vipers]

CONGRATS!!! I have loosely followed your build but I know you had to battle some problems to get where your at. It's funny that the first time I saw this car it was with Eddy and had a blown engine (pretty sure this car had black stripes at one point?), to now being a 800rwhp fire breathing animal.

You should come see it! I might be doing a night event at bondurant August 24th and will also be headed down to INDE in Willcox labor day weekend.

[Exhlr8n]

Congrats, looking forward to hearing that beast, and seeing it run..!

[Steve M]

Which headers?

[sharmut]

Do you mean lower torque BELOW 4k? That's not uncommon with a big cam, low end is often sacrificed to get bigger gains up top.

I was looking at the incorrect plotline, thought the orange was after the change.

[sharmut]

There really isn't any loss. Looks like maybe 12 ft/lbs max from 3,000 to 3,500 RPM's, that's it. Which is amazing considering how much more power this cam is making
Also, I switched to 3.91's so this is exactly what I was expecting/wanting.

Should be fun for you to figure out how early you can roll into throttle and keep all that power to the ground.

[Bruce H.]

What a great looking power band! The torque basically comes on at a similar rate but just keeps pulling to a higher rpm and then holds up well out to over 7000 rpm. So may not feel like it's pulling much harder but it's going to pull a lot longer in each gear making it much, much faster. The high redline may save you some gear changes, or maybe just make the new rear end ratio work that much better. Well done! Looking forward to your impressions and effect on lap times!

[IHOP]

Holy shit!!!! This graph is awesome AZ! I better go to Prefix next week.

[Mr. Hollywood]

Congrats. On what gas/octane? Hard to imagine on the typical 91 octane available in AZ. Unless it's perhaps the 100 you can get in at select pumps or MS109.

[mjorgensen]

Good lord this has to be a riot!

[Scott_in_fl]

Is it possible that Prefix is now reaching a "critical mass" number of installs that they are now getting closer to realizing the full potential of the 9L kit?

Prefix must have a good number of builds behind them by now, which must equate to a deeper knowledge base re: tuning, building, etc. Because, frankly, this latest build looks outstanding on the dyno.

Of course, I have no idea what they're seeing for temps, detonation, etc., but I assume they are keeping everything safe and sound.

I'm just flat out blown away by the NA power here.

[13COBRA]

There really isn't any loss. Looks like maybe 12 ft/lbs max from 3,000 to 3,500 RPM's, that's it. Which is amazing considering how much more power this cam is making
Also, I switched to 3.91's so this is exactly what I was expecting/wanting.

3.91s?! I bet that thing pulls like a freight train.

[ACRSNK]

Wow go Prefix!

[Arizona Vipers]

Which headers?

American Racing

[Arizona Vipers]

Congrats. On what gas/octane? Hard to imagine on the typical 91 octane available in AZ. Unless it's perhaps the 100 you can get in at select pumps or MS109.

C12. Bad news is I have to go about 15 miles to pick up the 5 gallon pails. Good news is they are lot more compact than fuel jugs so I'll be able to fit them a lot easier in my trailer and I'll just pour straight from the pail into a funnel direct into my car

[Arizona Vipers]

What a great looking power band! The torque basically comes on at a similar rate but just keeps pulling to a higher rpm and then holds up well out to over 7000 rpm. So may not feel like it's pulling much harder but it's going to pull a lot longer in each gear making it much, much faster. The high redline may save you some gear changes, or maybe just make the new rear end ratio work that much better. Well done! Looking forward to your impressions and effect on lap times!

Yeah even going with the 3.91's my shift speeds are insane due to the high redline and tall rear tire 28".
1st gear- 67mph
2nd- 96mph
3rd- 127mph
4th- 151mph
5th - 196mph
6th- 240mph lol

[Martyb]

Wow, awesome numbers buddy!! Can’t wait to see it at the track!

[catwood]

Prefix finally wrapped up my engine, just dyno'd at 803whp and 696wtq LOL. (Dyno Jet dyno on hot and humid day)
See graph below with a layover over the previous dyno before the new pistons, cam and valvetrain
You can read more about the motor build here- https://driveviper.com/forums/thread...ession-pistons
This is in a 2950lb 2013 Viper LOL

I'm not sure you are allowed to go with us to Willow anymore.

[RedTanRT/10]

C12. Bad news is I have to go about 15 miles to pick up the 5 gallon pails. Good news is they are lot more compact than fuel jugs so I'll be able to fit them a lot easier in my trailer and I'll just pour straight from the pail into a funnel direct into my car

Hey buddy, didn't know you need to run C12 to get that much power. 5 gallon VP $82.00?

[Arizona Vipers]

Hey buddy, didn't know you need to run C12 to get that much power. 5 gallon VP $82.00?

You don't, it's only 13 to 1, but we worked with Winkles on the tune to not kill power so much when it's hot out etc, one of the sacrifices I was willing to make was run C12.
I only do 6-10 laps a weekend, so the cost isn't a big deal for me. If anyone else goes with these pistons you could get away with 100 octane which is cheaper, but will have to go a little more conservative on the tune.

[Jack B]

Yeah even going with the 3.91's my shift speeds are insane due to the high redline and tall rear tire 28".
1st gear- 67mph
2nd- 96mph
3rd- 127mph
4th- 151mph
5th - 196mph
6th- 240mph lol

Good for the 1/2 mile also

[dewilmoth]

You don't, it's only 13 to 1, but we worked with Winkles on the tune to not kill power so much when it's hot out etc, one of the sacrifices I was willing to make was run C12.
I only do 6-10 laps a weekend, so the cost isn't a big deal for me. If anyone else goes with these pistons you could get away with 100 octane which is cheaper, but will have to go a little more conservative on the tune.

Maybe E85 could be an option too for folks that do not want to deal with race gas. Not sure how much headroom the stock fuel system has though.

[ViperTony]

I'm not sure you are allowed to go with us to Willow anymore.

LOL

[Whitey]

Congrats Cable. AWESOME build! I'm looking forward to hearing more when you get it back to AZ.

[Arizona Vipers]

The car is on it's way back from me from Prefix in Michigan, they just loaded her up! Sounds mean- https://www.youtube.com/watch?v=o9NK...ature=youtu.be

[J TNT]

I was at Prefix today, they have some awesome projects on the go !!!
Cool car Arizona Vipers !