No airbox = more power
#76
07-19-2017, 03:06 PM
Join Date: Feb 2010
Location: Austin
Posts: 1,022
Rep Power: 65 
Rich-I received my set, they look great! I will be installing them once I receive my new coilovers.
#77
07-19-2017, 03:09 PM
Join Date: Feb 2010
Location: Austin
Posts: 1,022
Rep Power: 65 The great thing about the filter adapters is that you can use a range of filters with them. Factory AML works, Redpants new dry filters or K&N. The redesigned bracket is very secure once fitted and extremely strong, the internal structure is a 3d honeycomb ABS for added support. The final set is just coming off the 3d printer and should be with Rich next week.
Rich and I were talking about it and thinking it may be best to keep it even without any air boxes as it still should push air to the open filter.
#78
07-19-2017, 08:58 PM
Join Date: Feb 2010
Location: Austin
Posts: 1,022
Rep Power: 65 When you install them the flange on the side points down and the locating tab on it is closest to the center of the car. Make sure you remove the rubber grommet and sleeve from the bracket that is bolted on to the car chassis. The tab then fits into this bracket and you use one of the original bolts with a washer and nut to locate it. I'm sure Rich will do a video to show how to fit them.
#79
07-26-2017, 10:23 PM
Join Date: Feb 2010
Location: Austin
Posts: 1,022
Rep Power: 65
Installed Rich's/Redpants air box deletes today in roughly 45 minutes. It's a straight forward job with the only trick being the removal of the rubber grommets mentioned above by Kanga (thanks). I also had to pull the vacuum tube from the manifold the connects to the n400 style air boxes.
I can confirm that the fit is great. Neither the air boxes nor the new holder will move around at all.
I can confirm that the fit is great. Neither the air boxes nor the new holder will move around at all.
#82
02-02-2018, 03:48 AM
Registered User
Join Date: Jan 2016
Location: Bristol/Newcastle Upon Tyne
Age: 49
Posts: 19
Rep Power: 0
Air intake duct removal
I am in the process of making my own little air box removal mod and wondered if you can remove the intake ducts without taking off more bodywork trim ? I already have the wheel arch liners, under tray, bumper liner and air boxes out. they seem to be very difficult to pull through the gap ? Any help would be appreciated.
#83
02-03-2018, 06:29 AM
IMHO, None.
This is a feel good mod. Without any additional changes, I do not believe there is any horsepower gains.
That said, removing the air boxes and remapping the ECU should provide an increase in HP.
This was the basis for the modification that increased the HP on the 4.3 from 380 to 400.
I would also change the cats to the less restrictive units.
This is a feel good mod. Without any additional changes, I do not believe there is any horsepower gains.
That said, removing the air boxes and remapping the ECU should provide an increase in HP.
This was the basis for the modification that increased the HP on the 4.3 from 380 to 400.
I would also change the cats to the less restrictive units.
#84
02-03-2018, 07:04 AM
IMHO, None.
This is a feel good mod. Without any additional changes, I do not believe there is any horsepower gains.
That said, removing the air boxes and remapping the ECU should provide an increase in HP.
This was the basis for the modification that increased the HP on the 4.3 from 380 to 400.
I would also change the cats to the less restrictive units.
This is a feel good mod. Without any additional changes, I do not believe there is any horsepower gains.
That said, removing the air boxes and remapping the ECU should provide an increase in HP.
This was the basis for the modification that increased the HP on the 4.3 from 380 to 400.
I would also change the cats to the less restrictive units.
#85
02-03-2018, 08:21 AM
Registered User
Join Date: Jan 2016
Location: Bristol/Newcastle Upon Tyne
Age: 49
Posts: 19
Rep Power: 0 My understanding was that be removing the air boxes and fitting a more free flowing air filter, there is a gain in HP. If this wasn’t the case, how could K&N and other air filter manufactures claim a gain in HP. Again, if you’ve got more air entering the plenum chamber (with MAF sensors in place) you should get more fuel, more fuel and air mean more HP ? It’s probably only about 5HP, but just a home project. I’ve already got 200 cat cells and tubi exhaust, so I’m expecting around 400 bhp.
#86
02-03-2018, 08:55 AM
Join Date: Feb 2010
Location: Austin
Posts: 1,022
Rep Power: 65
I have done before/after dynos on most mods over the years and found the 200 cell cats to be the biggest bang for the buck (and improvement in sound). I have done every mod I am aware of to help improve the little 4.3L and am putting down close to 400RWHP
That said I have not done an after Dyno with the air box delete. I did speak with TRG and David Appleby prior to removing and they both shared roughly 10rwhp gain with removal and drillling into the fender liners directly under the filters.
That said I have not done an after Dyno with the air box delete. I did speak with TRG and David Appleby prior to removing and they both shared roughly 10rwhp gain with removal and drillling into the fender liners directly under the filters.
#87
02-03-2018, 12:47 PM
You were able to get that much more out of the 4.3? What would that be, about 475HP at the crank? That's remarkable.
#88
02-03-2018, 07:32 PM
Registered User
Join Date: Feb 2015
Location: Corcoran, California
Posts: 405
Rep Power: 29
I can chime in as to the system adapting. When I first took mine out I'd get the occasional code. Hasn't happened now in over 6 months of driving including a track day. So I guess it's recalibrated.
#89
02-04-2018, 06:34 AM
Registered User
Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Age: 59
Posts: 1,471
Rep Power: 90
I thought that I saw somewhere that we get about 13% lost in power through the power train so it would be more like 400WHP to 450 Crank HP, more or less which is more believable. Maybe the 4.7 could reach the 475HP at the crank...