OTR and custom tune

[Davemac]

Just noticed on the OTR that I had installed yesterday that the rubber weather strip on the front underside of the bonnet has not been cut or removed, wouldn't this restrict airflow and power that the engine would make?
Has anyone else had one installed and the weather strip has stayed in place?

When I got my car a few months ago, the weather strip was still factory. The OTR instructions indicate that under bonnet temps could be higher if not cut although I never saw any higher engine temp. I've since cut it as per the instructions and throttle response certainly seems better.

 

[F1Aussie]

Cut the middle section of the rubber between the 2 clips leaving around 1.5cm extra length on each end (approx 50cm from mem)

this will maximise the airflow cold air intake potential

Cool, thanks, will do so.

 

[F1Aussie]

When I got my car a few months ago, the weather strip was still factory. The OTR instructions indicate that under bonnet temps could be higher if not cut although I never saw any higher engine temp. I've since cut it as per the instructions and throttle response certainly seems better.

That is good to know.

 

[F1Aussie]

Anyone here have an otrcai installed and also have one of those little plastic bonnet protectors on their car? If so did you take the protector off when you got the OTR? I can see from how it wraps under the bonnet that it could reduce airflow to the OTR.

 

[Shen Long]

Anyone here have an otrcai installed and also have one of those little plastic bonnet protectors on their car? If so did you take the protector off when you got the OTR? I can see from how it wraps under the bonnet that it could reduce airflow to the OTR.

That’s optional mate but logic will tell you that if the protector is in the path of the OTR - then chances are it will reduce the air flow.

to what degree, well that’s another story, so the choice is yours if you want to remove the bonnet protector.

 

[F1Aussie]

That’s optional mate but logic will tell you that if the protector is in the path of the OTR - then chances are it will reduce the air flow.

to what degree, well that’s another story, so the choice is yours if you want to remove the bonnet protector.

Yeah, I was not sure if these things have an optimum ) specific amount of air required or just as much as it can get access too. Think I will take it off then.

 

[MrBags]

I cannot see any significant loss from that. Never heard of any circumstance where this has been mentioned either, OTR will draw plenty enough through the grille area too.

 

[F1Aussie]

I cannot see any significant loss from that. Never heard of any circumstance where this has been mentioned either, OTR will draw plenty enough through the grille area too.
View attachment 235514

I have the orssom one and the openings for that kind of face upwards from what I can see it would really only draw air from above the grille and I think that is why they recommend to cut the rubber bonnet seal in front of it.

 

[Derekthetree]

From my research, it seems that the advice from manufacturers is to cut off the rubber in front to get more fresh air to the upper inlets.
The size of the lower and upper seems to vary a bit too between the makes. Orrsom looks to have bigger upper inlets?

I saw this on a VE HSV at Geelong. Look cool, but must be so bad for high intake temps.

 

[F1Aussie]

From my research, it seems that the advice from manufacturers is to cut off the rubber in front to get more fresh air to the upper inlets.
The size of the lower and upper seems to vary a bit too between the makes. Orrsom looks to have bigger upper inlets?

I saw this on a VE HSV at Geelong. Look cool, but must be so bad for high intake temps.

Yes the upper inlets are quite significant in size on the orssom.