same boost level after going back to stock intercooler?

[JDSfastGN]

I have a BGC (bowling greens custom) 23 row intercooler with a welded on duttweiler neck. I recently had to remove it to take it in for some repairs to the threaded bung where the bracket bolt in. I installed a bone stock intercooler and without touching the wastegate rod i am still running the same 25 psi i was before? Is the BGC not a decent unit? The bottom row is crushed but i still figured the boost would drop quite a bit. The car still feels very fast but its hard to tell seat of the pants wise. I know on my dads similarly setup GN when i had the stock intercooler i couldn't even get over 20 psi of boost with the wastegate maxed out. After installing the front mount it easily can go 27+ so i know the stocker has to be a restriction at this level. Thanks for any input. BTW this is not the only car this has happened to. A few years ago we installed my same BGC intercooler on a buddies car while mine was down and did not see a gain in boost over the stocker. I know these are not back to back test with any track data but im still a little surprised.

 

[Blazer406]

I am about to install a BGC 23 row on mine. I would have thought there would have been some difference too. Did you drive it with it on.... check exact boost....remove it.... go back out same outside temp... same afternoon... and see what the boost level is?

I noticed on my car with a stock type boost controller..... that my boost varied as much as 3 psi.... based on the outside air temp mostly. On a cool day... my car would go to 22 psi or so with the setting I had... then on a hot day.... it wouldn't scare 20 psi. This is where a real closed loop boost controller will shine.... 20 psi one day when it is 40 deg outside..... 20 psi 2 months later when it is 95 deg outside.... doesn't matter.... still 20 psi....

HTH

 

[BlackBandit]

What boost controller are you running? If you're running a MBC referenced at the same place your boost gauge reads then you shouldn't see any change. If you're set up like this the only change you would be able to see would be in air charge temperature. HTH. james

 

[SHADOWII]

It seems...

the BGC may have a restriction in it, if it is performing the same as the stocker. Have you tried measuring the input temps vs the output temps to see if they are similar? The BGC o/put temps should be considerably cooler given the surface area.

 

[JDSfastGN]

All im using is a heavy duty stock style wastegate. It has been low 90s here for the past month or so, and pretty much driving it daily it has seen 25 psi and held there steady throughout the period. Im pretty interested in seeing the difference in the units so as soon as i get my BGC unit fixed i will try and do some back to back test at the track. But this was the same day when i switched them out. Same boost in the late afternoon as it was earlier in the afternoon.

 

[VadersV6]

Reverse blow or flush the thing out. If this IC is just a stock IC with extra tubes added, I wouldnt really expect to see much of an improvement in pressure drop. The cross sectional area of the neck is the problem, not the area of all the tube inlets combined.

 

[JDSfastGN]

Reverse blow or flush the thing out. If this IC is just a stock IC with extra tubes added, I wouldnt really expect to see much of an improvement in pressure drop. The cross sectional area of the neck is the problem, not the area of all the tube inlets combined.

its a bowling greens custom. Its not a stocker or anything like one other than mounting in the same location. It is supposed to be on par with most of the better stock location units such as the V4 or precision. It is a bit older but i know of a few people that have been 10s on the unit. I flush and clean it so ill hold judgment until i do a back to back 1/4 test.