What's my rwhp?
11-25-2017, 08:25 AM
#1
What's my rwhp? Getting ready to build my stock bottom end WS6 with an A4 and 3.73's. Here's a list of mods:
TEA Stage 2 243 heads
BTR Stage 4
102mm vengeance ported fast intake
NW 102 tb
42 lb. injectors
What will it put down on the rollers?
TEA Stage 2 243 heads
BTR Stage 4
102mm vengeance ported fast intake
NW 102 tb
42 lb. injectors
What will it put down on the rollers?
Last edited by td1168; 11-25-2017 at 08:26 AM. Reason: Mispelling
11-25-2017, 08:40 AM
#6
TECH Senior Member
iTrader: (2)
Join Date: Aug 2012
Location: Howell & Fenton MI
Posts: 11,145
Likes: 0
Received 15 Likes
on
15 Posts
Based on personal experience I will tell you this....don't worry about the dyno number if the car performs like it should. If this setup traps around 120 mph in a full weight setup then it's running good for what it is. Like mentioned above it could be anywhere from 400-450, but it really doesn't matter if it's setup and running right
Trending Topics
11-25-2017, 08:54 AM
#8
TECH Junkie
I trapped 121 - 122 mph hitting the limiter on the 1-2 and 2-3 shift.
I put down 396 whp on a random hub loaded dyno through my loose, unlocked converter with setup in my sig. Made 2 pulls for fun.
I put down 396 whp on a random hub loaded dyno through my loose, unlocked converter with setup in my sig. Made 2 pulls for fun.
11-25-2017, 09:02 AM
#9
TECH Senior Member
iTrader: (2)
Join Date: Aug 2012
Location: Howell & Fenton MI
Posts: 11,145
Likes: 0
Received 15 Likes
on
15 Posts
Prime example. 396 rwhp and tapping the limiter but with a 122 trap. Take another HCI LS1 with a similar build that's makes say 450 rwhp, but traps say 118...ive seen it go that way as well lol
11-25-2017, 02:20 PM
#15
Haven't figured that out yet. I ran 17" MT Drag Radials on my 01 camaro in my sig. That car was an M6 with 3.90's. I put down 440 rwhp but never ran any better than 11.90's and usually trapped 118-119mph. I sucked at shifting and that's why I bought an auto! Lol
11-25-2017, 02:26 PM
#16
11-25-2017, 03:34 PM
#17
CIDxrpm/3456 = CFM @ 100% VE * .069 (rough temp conversion) = lb/min @ 100% VE
Tell me what you get, then subtract 10-15% for drivetrain losses and thats what you have.
Example:
355cid X 6000 / 3456 = 616CFM * .069 = 42.5lb/min = 425BHP
Thats a turbo-conversion (for temperature) so power should be slightly over that. Also keep in mind its only 6k, if you goto 6500 or 7000 it will be massively different.
So give it 20horsepower for non-turbo air, 445BHP, then subtract 12% for manual trans = 391RWHP @ 6000rpm
Its just a rough estimate
all dyno read different (dynojet I prefer because the roller never changes 'weight')
Tell me what you get, then subtract 10-15% for drivetrain losses and thats what you have.
Example:
355cid X 6000 / 3456 = 616CFM * .069 = 42.5lb/min = 425BHP
Thats a turbo-conversion (for temperature) so power should be slightly over that. Also keep in mind its only 6k, if you goto 6500 or 7000 it will be massively different.
So give it 20horsepower for non-turbo air, 445BHP, then subtract 12% for manual trans = 391RWHP @ 6000rpm
Its just a rough estimate
all dyno read different (dynojet I prefer because the roller never changes 'weight')
02-11-2018, 07:49 AM
#18
Well some plans changed. I picked up a set of tfs215’s and I’ve decided not to run the BTR Stage 4 cam. I almost set on going with the vengeance racing VRX5 cam but I’m not sure of what lsa and advance to run. Vengeance said to stay with the 113+2 but I thought the 111 would build better mid range torque. Any help from you guys would be appreciated!!
02-11-2018, 07:52 AM
#19
Well some plans changed. I picked up a set of tfs215’s and I’ve decided not to run the BTR Stage 4 cam. I almost set on going with the vengeance racing VRX5 cam but I’m not sure of what lsa and advance to run. Vengeance said to stay with the 113+2 but I thought the 111 would build better mid range torque. Any help from you guys would be appreciated!!