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Engine Specific Info and Questions => IDI Engine => Topic started by: pfai on October 29, 2007, 06:18:53 am

Title: No Boost
Post by: pfai on October 29, 2007, 06:18:53 am

I have an Air Research Turbo on a 1983 Quantum engine-1.6 TD - not boosting at all .  Fresh engine rebuild, just did Gov mod, pump timing is set @ 1.05 mm, did timing advance mod.   Shows slight vac on boost guage till let off accelerator then gets small pressure surge.  I tightened manifold bolts but were still fairly tight. Turbo has the internal waste gate setup,if ya wana call it that.
  Any help on this would be appreciated.   Thanks,Paul

Title: make that, very late boost
Post by: pfai on October 29, 2007, 12:21:50 pm

finally got it out on the road, will boost but not until rpm's are pretty high-no tach-can't be specific      Paul

Title: No Boost
Post by: subsonic on October 29, 2007, 03:23:36 pm

Any chance the waste gate may be stuck open?

Title: No Boost
Post by: Black Smokin' Diesel on October 29, 2007, 03:40:33 pm

How big is that turbo? Could be turbo lag. I got a k24 and I have next to no boost when there's no load (revving in neutral gets me 3 psi and I can get 20 psi on the road).

Title: No Boost
Post by: g-spec on October 29, 2007, 04:28:22 pm

I have a 1.9TD with a T3 and i cant get the guage to show boost standing in neutral. on the road I hit 9lbs (stock for now) It start building boost just after 2k rpm!!!!

Title: No Boost
Post by: Vincent Waldon on October 29, 2007, 04:32:50 pm

The bigger stock turbos (Garrett T3 and KKK K24) generally don't start to deliver significant boost until the engine is in the 3000 RPM range... depending on the trim of your turbo this may be what you are seeing.

My boost gauge on my T3 start to rise a bit under full load at about 2500 RPM (I've done nothing to the fuel) and I get no boost at all without load.

Can you borrow a tach from someone ??  Gonna be difficult to tell if your turbo is just too big for the engine without some numbers in this area...


Vince

Title: No Boost
Post by: subsonic on October 29, 2007, 08:03:22 pm

What is the turbo off of?  Do you have the number off the tag?