SRT Hellcat Forum banner
  • Hey Everyone! Vote for the Site Favourite HOTM winner for the year of 2022 HERE!

Advice? 2.85 Pulley w/ Demon injectors tuned on 93

1762 Views 11 Replies 8 Participants Last post by  TNCHARGER
I recently installed the hellraisen 2.85 upper pulley with demon injectors tuned on 93. The car went for a tune on a mustang dyno, the car put up these numbers. My tuner said my fuel pressure was dropping to 71 psi (he tried to keep it around 80psi) and i might need a boost a pump to supplement fuel supply. (can i get advice on which boost a pump to go for). He also stated my intake (LMI) temps were spiking on dyno upwards to 160F. He recommend replacing CAC pump. (Could i get more info on which ones to go for).
Rectangle Slope Art Font Parallel
1 - 12 of 12 Posts

· Registered
Challenger SRT Hellcat
Joined
·
4,155 Posts
I recommend the JMS boost a pump . It's easier to hook up , has more control and doesn't fail as much as the kenne bell does .
But the dual pump kit is the best option .

The LMI only works well when the car is moving . Sitting still on the dyno there is not enough air flow .

Sent from my Armor 8 Pro using Tapatalk
 

· Registered
Joined
·
17 Posts
This might be slightly off topic but will adding the 2.85 pulley put a hit on gas mileage? Obviously, yes under heavy load but let's say highway constant speed.. blower will be spinning faster so will that automatically equate to more fuel demand?
 

· Have Guns Will Travel
2019 Challenger SRT Hellcat Redeye - 2015 Challenger Hellcat
Joined
·
6,651 Posts
If I'm reading the graph right you gained over 75 HP just with the different pulley and injectors ??
I got closer to 100hp as advertised. My duty cycle is good as well.
 
  • Like
Reactions: Cosmic Blue

· Registered
2016 Hellcat 6 speed with a few mods
Joined
·
14 Posts
I got closer to 100hp as advertised. My duty cycle is good as well.
I have the same pulley on mine with a AC Killer Chiller. Also Dynatech header. Previous owner had everything done. He never told me anything about different injectors or fuel pump. He claimed it was 725 WHP. I didn't get the dyno sheets or any receipts. Just thought it was interesting how much power you got just with that pulley. I wasn't aware that bigger injectors were needed with it and a bigger fuel pump. I would think I would notice something isn't right if it was starving for fuel.
 

· Registered
Challenger SRT Hellcat
Joined
·
1,593 Posts
I have the same pulley on mine with a AC Killer Chiller. Also Dynatech header. Previous owner had everything done. He never told me anything about different injectors or fuel pump. He claimed it was 725 WHP. I didn't get the dyno sheets or any receipts. Just thought it was interesting how much power you got just with that pulley. I wasn't aware that bigger injectors were needed with it and a bigger fuel pump. I would think I would notice something isn't right if it was starving for fuel.
If your engine is starving for fuel what you will eventually notice is a loud boom from the engine compartment.....I had the 2.85 on my Challenger Hell Cat and Charger Hell Cat. I also installed Demon injectors as advised by my tuner. Both cars were dynoed and had no issues with fuel delivery.
 

· Registered
2016 Hellcat 6 speed with a few mods
Joined
·
14 Posts
If your engine is starving for fuel what you will eventually notice is a loud boom from the engine compartment.....I had the 2.85 on my Challenger Hell Cat and Charger Hell Cat. I also installed Demon injectors as advised by my tuner. Both cars were dynoed and had no issues with fuel delivery.
Just talked to guy I bought my car from. There aren't bigger fuel injectors or a bigger fuel pump. Will call the shop that did all the work sometime this week. If I install the Demon fuel injectors will I have to have the car tuned again ??
 
1 - 12 of 12 Posts
Top