Impellor Member 835 Member For: 14y 6m 13d Gender: Not Telling Posted 07/04/12 05:42 AM Share Posted 07/04/12 05:42 AM Hoping someone may have some info on underbonnet and intake temps, Cheers Link to comment Share on other sites More sharing options...
Impellor Member 835 Member For: 14y 6m 13d Gender: Not Telling Posted 07/04/12 06:52 AM Author Share Posted 07/04/12 06:52 AM Anyone????? Link to comment Share on other sites More sharing options...
Benny Member 1,869 Member For: 21y 5m 27d Gender: Male Location: Newcastle Posted 07/04/12 07:37 AM Share Posted 07/04/12 07:37 AM Depends on your intake and where it draws from. If you're running a factory intake or cold air intake then the air should be quite a bit cooler than the air in the engine bay. If you've got a pod exposed in your engine bay like many Jap modified cars I've seen then the intake temps are going to be much the same as the engine bay temps.Benny. 1 Link to comment Share on other sites More sharing options...
Impellor Member 835 Member For: 14y 6m 13d Gender: Not Telling Posted 07/04/12 08:23 AM Author Share Posted 07/04/12 08:23 AM Factory Turbo crossover with standard airbox, Cheers Link to comment Share on other sites More sharing options...
Panda Eyes flame magnet Gold Donating Members 5,674 Member For: 16y 8m 16d Gender: Male Location: adelaide hills- 'race air' central Posted 07/04/12 08:58 AM Share Posted 07/04/12 08:58 AM that is actually a really good question. do you mean intake AIR temp or intake MANIFOLD temp? Link to comment Share on other sites More sharing options...
Impellor Member 835 Member For: 14y 6m 13d Gender: Not Telling Posted 07/04/12 10:15 AM Author Share Posted 07/04/12 10:15 AM Air temp in the crossover entering the TB. Cheers Link to comment Share on other sites More sharing options...
Panda Eyes flame magnet Gold Donating Members 5,674 Member For: 16y 8m 16d Gender: Male Location: adelaide hills- 'race air' central Posted 08/04/12 02:37 AM Share Posted 08/04/12 02:37 AM absolutely. if the air going into the tb is as hot as the bay then the power will be down\/ \/ \/with a good intake duct- big, straight etc then the air entering the turbo will be nice and cool and the cooler air will keep the duct cool.the turbo will heat the air of course, but the cooler the air/ shorter the distance it has to travel from the filter to the turbo is the less it will heat.then it will depend on the size/ flow of the 'hot side', the intercooler and 'cold side' piping. the larger/ shorter/ straighter that all is will result in cooler air temps at the tb.that's why piping choice and intercooler size is so vital when chasing power... Link to comment Share on other sites More sharing options...
Benny Member 1,869 Member For: 21y 5m 27d Gender: Male Location: Newcastle Posted 08/04/12 10:14 AM Share Posted 08/04/12 10:14 AM Impellor,If you are concerned that the engine bay temps are affecting the air flowing through the induction piping then my opinion would be not really. With the velocity that the air is flowing through your induction piping I find it difficult to believe the conduction of heat through the intake piping walls would be significant enough to see an affect on charge temps considering the speed at which the air is flowing when at full throttle.Benny. Link to comment Share on other sites More sharing options...
STAINLESS again plz You've changed man.... Donating Members 8,142 Member For: 14y 1m 6d Gender: Male Location: 2 Fuchsia Court, Narre Warren. 3805 Posted 08/04/12 11:05 AM Share Posted 08/04/12 11:05 AM the air goes from outside of car to the turbo in like a second. then through cooler to throttle body in like another second. no time to heat up from engine bay temps. only the turbo will cook the air, that's what an intercooler is for. 2 Link to comment Share on other sites More sharing options...
Impellor Member 835 Member For: 14y 6m 13d Gender: Not Telling Posted 08/04/12 11:24 AM Author Share Posted 08/04/12 11:24 AM Thanks Benny. I will fill you in. I'm actually attempting to be a modern day hot rodder. So whats his all mean? I am trying to get the most out of the original car. The only changes I made are rear muffler removal , monza cooler and a KN Filter with airbox mod. So I thought about how I could make the crossover pipe more efficient. Firstly I wondered whether it really needed to be Black, as we know black attracts and absorbs radiant heat. But black is also (3-8%) more effective at dispersing heat, thus this is why a radiator is black and should be black. But this is only beneficial, as the coolant inside is hotter than the air passing through the radiator. So if the air passing through my crossover is cooler than the air within the engine bay, I would benefit by having a reflective or polished crossover due to it greater ability to reflect and not absorb radiant or themal heat waves. Now having a stock BFII running 6 psi I felt comfortable that intake was temp would be lower than underbonnet temps. Now if I was running higher PSI it could have the reverse effect. Because shiny or light colours are less effective at expelling conducted heat. Which would mean that once the crossover got hot it basically would stay hot.By to my rodder perspective, so once I made the decision to take the crossover off I found that the casting and flow could be improved upon. Now I'm not sure whether I will see a difference due to piping restrictions of the standard car. But I was able to open up the 2 inch inlet and greatly improve flow, as there are quite a few areas that were rough and without doubt would provide tubulence. So that's it in a nutshell. Cheers Link to comment Share on other sites More sharing options...
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