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the most boost on 745 intercooler
Posted: Jan 24, 2013 9:10 PM
by rod2190
what amount of boost can the stock 745i intercooler handle cooling wise when does it become inefficient and necessary for a bigger one and what size would be recommended for a 635 if going bigger is necessary. thanks for your time
Re: the most boost on 745 intercooler
Posted: Jan 25, 2013 12:09 AM
by Hit Man X
rod2190 wrote:what amount of boost can the stock 745i intercooler handle cooling wise when does it become inefficient and necessary for a bigger one and what size would be recommended for a 635 if going bigger is necessary. thanks for your time
Over on Scottie's 745i site a while back someone did some testing with the air intake temps with the IC and without... needless to say, it was not pretty. Once it heat soaks, the thing becomes useless.
Go ahead and budget for a real IC setup like from TCD. All I have seen for the air to air kits for E24s required extensive cutting/fitment.
Hope it helps.
(Cliff's Notes - do not waste your time with the stock 745i intercooler)
Posted: Jan 25, 2013 9:52 AM
by clongo
Yup, ditch it and go TCD or do a custom A/A setup. That stock 745i intercooler is worthless because it heat soaks so quickly.
And since it appears that you are trying to use a complete 745i turbo setup on your E24. Just use the turbo, manifold, and intake. Nothing else is worth swapping over. The dowpipe will also not fit a E24 chassis so you will need to modify it to fit.
Posted: Jan 25, 2013 10:26 AM
by rod2190
thanks for the info i have both an aftermarket air to air and the stock 745 intercooler i was just wondering if it was actually worth the cut and chop work battery relocation etc. planning on running 12 to 14psi
Posted: Jan 25, 2013 11:45 AM
by turbodan
It will heatsoak at any boost pressure. It doesn't have the heat exchanging capacity to keep up. Running more boost than stock is going to exacerbate the problem.
Posted: Jan 25, 2013 1:35 PM
by 9mil
Sounds like you are at almost the same setup as me- e24 with 745 mani and turbo- that's about all that I used - oh and the m106 too-
Hit me on the emails and I can shoot you some pics and parts list of a FMIC setup I adapted to use on my 6.
Phil400@att.net
Ill post the conversation here later for reference - working from phone currently.
Posted: Jan 25, 2013 1:37 PM
by ldsbeaker
turbodan wrote:It will heatsoak at any boost pressure. It doesn't have the heat exchanging capacity to keep up. Running more boost than stock is going to exacerbate the problem.
Boy. You're just FULL of bad news...
Posted: Jan 25, 2013 10:20 PM
by winfred
you are compounding the problem with pushing the stock small turbo to where its less efficient and wasn't designed to be, which reveals the weak change cooling ability
Posted: Jan 26, 2013 1:16 PM
by Nebraska_e28
Wouldnt efficiency be marginally increased if the IC was boxed off from the engine compartment?
Posted: Jan 26, 2013 1:35 PM
by T_C_D
The intercooler is actually very nicely constructed and works fine in the stock location on an e23 up to about 10psi.
Posted: Jan 27, 2013 12:30 PM
by rod2190
i'm not using a stock k27, manifold and wastgate is proly the only thing stock i'm using i'm gonna run my own induction piping, and to "LSD" can i ask why i'm full of problems?
Posted: Jan 27, 2013 12:31 PM
by rod2190
bad new? (i mean)
Posted: Jan 27, 2013 3:33 PM
by mooseheadm5
rod2190 wrote:i'm not using a stock k27, manifold and wastgate is proly the only thing stock i'm using i'm gonna run my own induction piping, and to "LSD" can i ask why i'm full of problems?
Ldsbeaker was clearly not replying to you.