Hesitation Under Boost

[dope96clipse]

Ok I was asked to help do a turbo swap on a buddies practically completely stock 96 gst. did the swap (just another t-25 ) and everythnig works minus a small oil leak on the oil return line...but when driving the car it bucks underboost from 3k-5500. but when easy on the gas it goes all the way to 7k with out a hitch. the car only has a 190lph pump and the standard BCS mod. It acts like it has too much fuel but idk im lost. It doesnt puff any smoke at all and other then the bucking under boost works great.. anyone have any ideas? anything will be help full thanks

 

[Onizuka186]

You will need to pull the ECU to find out which version of ECMLink you have. If it is V3, then a replacement cable can be had for $45 from ECMTuning. If you have V1 or V2/2.5, you will need to source one privately.

If your not sure how to pull the ECU:

http://www.dsmtuners.com/threads/resolved-need-diagram-to-remove-ecu.253650/
http://www.dsmtuners.com/threads/resolved-need-diagram-to-remove-ecu.253650/
Once you pull the ECU, remove the four screws located on the ECU case to remove the cover. With the cover removed, you will be looking for something like this:

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When i bought the car the previous owner told me it is dsmlink not ecm so that means its an old version i guess?

 

[2gmitsueclipse]

When i bought the car the previous owner told me it is dsmlink not ecm so that means its an old version i guess?

The term is used interchangeably. Pull the ECU.

 

[Onizuka186]

Kk guys ill replace the spark plugs, make a BLT. And if it continues ill pull the ecu. Thals alot for the help i realy appreciate

 

[doubleclutch]

Kk guys ill replace the spark plugs, make a BLT. And if it continues ill pull the ecu. Thals alot for the help i realy appreciate

If you truly have DSMlink you have $400 of tuning potential. Why would you not pull it anyway to verify and buy yourself a cable. It is 50$ man.

 

[Onizuka186]

If you truly have DSMlink you have $400 of tuning potential. Why would you not pull it anyway to verify and buy yourself a cable. It is 50$ man.

Im 100% sure it has the dsmlink cause the launch control is set to 4500rpm. Ill pull it to be sure but right now its realy cold in Switzerland to work on the car. Ill wait a few month when the weather is better.

 

[Onizuka186]

I found the problem, the previous owner has install Nkg bkr7e spark plugs, so when the car warm up it starts hesitating, i just installed today some brand new nkg bpr6es gap at .028 and it get rid of the hesitation, but i though ngk are made from japan and on mine it says made in france, is that normal?!? Btw it fixed the problem for less than 10bucks

 

[1990TSIAWDTALON]

It is always nice to hear a happy ending to the story, thanks for posting back the results. It may be helpful to some other owners in the future! Hope its warming up over there.