How do I hook up a mbc?
- Thread starter 8thsin
- Start date
Ian Turgeon
Cascading Inspiration
Re: How do I hook up a mbc?
And you dont know how a manual boost controller works?
turbo => boost controler => wastegate will work fine. Why arent you letting the computer control boost?
8thsin said:
And you dont know how a manual boost controller works?
turbo => boost controler => wastegate will work fine. Why arent you letting the computer control boost?
I know how one works (considering i build some) but on some cars like my srt4 there is three vac lines that are all diffirentand each change the cars performance , Blue line = top end power Green line = bottom end power Black line = ??? i have not tried it yet. Point is I was just wondering how others ran there mbcs. The reason I am not letting the stock computer control boost is becasue it is hitting 20+psi, with only a 3inch exhaust cat back and the cat is not gutted. It alos has a kenne bell intake but that is it, besides the regular ignition upgrades. I though i would run it from the poert on the wastegate to a vac source but where. Thanks, I could figure it out on my own but I would rather follow someone elses ideas like your how to sections, which are fantastic.
Ian Turgeon
Cascading Inspiration
No ours are strait forward, get boost off the turbo compressor or intake manifold and send it through the mbc into the wastegate.
If you still have a cat, I'd suggest taking a stab at making sure the vacuum lines are hooked up correctly and are in good shape. Test the wastegate action with a vacuum tester. After that if the solenoid is working, then the only thing left could be the wastegate is sticking.
When did the truck begin over boosting? after the 3" exhaust? or has it done it before? Is it a "high flow" cat?
If you still have a cat, I'd suggest taking a stab at making sure the vacuum lines are hooked up correctly and are in good shape. Test the wastegate action with a vacuum tester. After that if the solenoid is working, then the only thing left could be the wastegate is sticking.
When did the truck begin over boosting? after the 3" exhaust? or has it done it before? Is it a "high flow" cat?
After the 3inch exhaust, and it has the stock cat. I am going to have kwik6 custom make a chip that can handle or change the duty cycle of the wastegate, so i can replace the cat with a 3ich pipe. But for now I am going to try to turn down the boost with the mbc. Thanks for the help.
InvisiBill
Active member
My truck is bone-stock in the boost control section. One of the previous owners removed the stock mufflers, and I had no problems with overboost. A while ago the back half of the exhaust rusted off around the axle. Still had no overboost. Just recently, it rusted off at the flange to the cat. Still had the same boost control, but it's really loud and annoying in the cab.
These trucks are all different, but if you're getting 20psi spikes, I'd guess that you have a problem with something in your boost control system. It might be as simple as cracked vac lines to/from the boost solenoid (which would be fixed by the new boost controller's lines, not the controller itself) or it could be a sticky or misadjusted wastegate arm. It seems to me that changing the chip or using a separate boost controller is a band-aid for the symptoms, rather than actually fixing the problem.
http://www.syty.net/phpBB2/album_pic.php?pic_id=349
These trucks are all different, but if you're getting 20psi spikes, I'd guess that you have a problem with something in your boost control system. It might be as simple as cracked vac lines to/from the boost solenoid (which would be fixed by the new boost controller's lines, not the controller itself) or it could be a sticky or misadjusted wastegate arm. It seems to me that changing the chip or using a separate boost controller is a band-aid for the symptoms, rather than actually fixing the problem.
http://www.syty.net/phpBB2/album_pic.php?pic_id=349
I geuss it is just coincendental that before the exhaust it was boosting 15psi, and after it was 20+psi, So something went wrong at the same time. But i think that it is probably wastegate related, I dont think it can get rid of the pressure fast enough. I am going to do all of the vac lines in silicone, but is there a upgraded wastegate available for the stock turbo, with a better spring, and maybe a triple port? Thanks for all of the help. I will let you know how it goes.
ghettosled
SYTY SUPERSTORE
the chip although it may help, will not fix your overboosting problem. The main issue is the undersized wastegate. There are upgrades available, but most require the turbine housing to be removed and machined for the larger flapper. You can try loosening the rod on the wg since its adjustable, or install an external wastegate on the crossover if you want better boost control.
If all your vacuum lines are in good shape, the boost controller will doubtfully help either, b/c basically it would act the same as a few small cracks or pin holes in your vacuum line.
try unplugging your wg selenoid and verify the boost is closer to 8psi which is the wg spring.
If all your vacuum lines are in good shape, the boost controller will doubtfully help either, b/c basically it would act the same as a few small cracks or pin holes in your vacuum line.
try unplugging your wg selenoid and verify the boost is closer to 8psi which is the wg spring.