mrgee2jz Posted October 12, 2010 Share Posted October 12, 2010 Hi everybody, I will shortly be making a new exhaust for my 2JZ E30 as mine is way too loud, at the moment it's running a 4" setup, What's the max proven power with a 3" ?? I am looking to run a decent 850hp dyno proven the crank Can a 3" run this or will I be choking it? Or do I go 3.5" or stay with 4" and add more boxes? Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted October 12, 2010 Share Posted October 12, 2010 I'd silence the 4" system with more/better boxes personally. Heatwrapping the whole exhaust might help a bit too. Quote Link to comment Share on other sites More sharing options...
dude Posted October 12, 2010 Share Posted October 12, 2010 Had this convo with Terry S the other day, plenty of cars used to run over 1000 with a 3". Quote Link to comment Share on other sites More sharing options...
Paul Whiffin Posted October 12, 2010 Share Posted October 12, 2010 I run 3.5" front to back 94db and so far its up to 860bhp approx. without any problems. Quote Link to comment Share on other sites More sharing options...
mrgee2jz Posted October 12, 2010 Author Share Posted October 12, 2010 this is all making me smile, anybody we know now running a 3 inch with 850 approx, or is it not reccomemded? Quote Link to comment Share on other sites More sharing options...
dude Posted October 12, 2010 Share Posted October 12, 2010 I'd silence the 4" system with more/better boxes personally. Heatwrapping the whole exhaust might help a bit too. Wrapping is so last year darling!!!!!!!! I can get that coated inside and out for not too much. Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted October 12, 2010 Share Posted October 12, 2010 Wrapping is so last year darling!!!!!!!! I can get that coated inside and out for not too much. Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted October 12, 2010 Share Posted October 12, 2010 Wrapping is so last year darling!!!!!!!! I can get that coated inside and out for not too much. Oh.. I'm sorry sweetheart, I really need to keep up with the fashion don't I?! Quote Link to comment Share on other sites More sharing options...
JamieP Posted October 12, 2010 Share Posted October 12, 2010 Bigger the better, id silence the 4" system, with my big backbox mine is super quiet. Quote Link to comment Share on other sites More sharing options...
dude Posted October 12, 2010 Share Posted October 12, 2010 Oh.. I'm sorry sweetheart, I really need to keep up with the fashion don't I?! Yes wrapping is not sexy !!!!!! Quote Link to comment Share on other sites More sharing options...
mrgee2jz Posted October 12, 2010 Author Share Posted October 12, 2010 Yes wrapping is not sexy !!!!!! i wrapped my manifold and it all fell apart, just became brittle Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted October 12, 2010 Share Posted October 12, 2010 One way to find out, fit a 3" and go for it! Quote Link to comment Share on other sites More sharing options...
sdistc Posted October 12, 2010 Share Posted October 12, 2010 this is all making me smile, anybody we know now running a 3 inch with 850 approx, or is it not reccomemded? My Supra runs a 4 inch dump to a Blitz Nur Spec cat back (which I think is 3.25 inch) and made (conservative tune) 830 whp @ 31psi on a Dyno Dynamics. Quote Link to comment Share on other sites More sharing options...
Scott Posted October 12, 2010 Share Posted October 12, 2010 I don't think it will be a limitation until really silly HP. It will be a restriction when hunting the big numbers though, having a 4" instead of the 3" is always going to gain you quite a few HP when chasing the numbers. Quote Link to comment Share on other sites More sharing options...
mrgee2jz Posted October 12, 2010 Author Share Posted October 12, 2010 my setup now is 4" to the back, then splits to two 3" pipes, one left, one right, with only 1 back box on each, worst case ill install the 4" downpipe, then split it to two 3" exhausts there, and that way i can have a good few center boxes on the way to the back, Just a load of extra weight i dont really need though. I was thinking if a mongoose 3" exhaust will somehow flow a nice 850hp id like to keep it quiet. Quote Link to comment Share on other sites More sharing options...
mrgee2jz Posted November 5, 2010 Author Share Posted November 5, 2010 this is what ive done so far:: The original system was 4" to the diff, then split in to 2 feeding 2 rear boxes only Original exhaust Mock up of new system Quote Link to comment Share on other sites More sharing options...
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