E38 idle tuning

[AllOutPerformance]

i did pull the fast off right now and found some loose runners but none of them were really loose just a few turns of the torx

[PRAY]

Same thing just happened to me with a FAST 102/NW 100 combo. This thing ran like a dream for a couple days then the day of the dyno it crapped the bed on me as far as drivability. Tuned and tuned and got it to work for a couple days. Then it crapped out again. I had to be out of the country so the customer took it to three different well known shops after who tried to tune it and ended up with my tune over and over. Turned out to be the FAST was cracked behind the TB mounting nut. You can't tune that out. I have not been impressed with the FAST's as of late.

[AllOutPerformance]

Ok update after some help from a fellow forum member the idle was never right with the fast.we pulled fast off and loaded my earlier tune and bamm idled cherry.and only lost 8 whp.pickedup alittle tq to with stock intake.

[Naf]

No need to look at the tune, the problem was with the Fast manifold, and it's a MAFless tune anyway.

Simon

Ah, was it an air leak due to bad inner seal? I always take mine apart and give the inner a nice bead of silicone.

Why did you go MAFless? is it due to lack of space in front of the TB or for a few more ponies? I found my CTS ran better with my MAF than without it...102mm

[swingtan]

I'm not sure what is was, but there was a lot wrong. The car is actually on the other side of the country and I've been tuning it remotely.

It's MAFless for a number of reasons...

• Nick Williams 102mm TB: Why go a bigger TB if the MAF is still only 90mm?
• The OTR would result in a very tight fit for the MAF.
• The MAF would be positioned directly in front of the TB. This tends to amplify cam pulsing being detected by the MAF, causing incorrect reading.
• The customer wanted it tuned MAFless.

My car still runs the MAF, I don't really mind either way.

Simon.

[Naf]

I'm not sure what is was, but there was a lot wrong. The car is actually on the other side of the country and I've been tuning it remotely.

It's MAFless for a number of reasons...

• Nick Williams 102mm TB: Why go a bigger TB if the MAF is still only 90mm?
• The OTR would result in a very tight fit for the MAF.
• The MAF would be positioned directly in front of the TB. This tends to amplify cam pulsing being detected by the MAF, causing incorrect reading.
• The customer wanted it tuned MAFless.

My car still runs the MAF, I don't really mind either way.

Simon.

I agree the OTRCAI has the MAF too close to the TB and you would have to increase the MAF to 1000rpm and let it automatically adjust instead of using the MAF as a reference.

The 102 is a monster, have a 102mm intake with 102mm MAF and 102mm TB goin into a 105 FAST intake. Idle and low loads was a problem. Had to increase timin to the max to get me moving...

[Roonstain]

Sorry for the overly basic question, but how would one tune in a lumpier idle?
The car is already cammed and has been tuned with a fairly smooth idle

[Naf]

Sorry for the overly basic question, but how would one tune in a lumpier idle?
The car is already cammed and has been tuned with a fairly smooth idle

Drop ur idle timong by 2-4 degrees get it somewhere between 15-17 degrees of timing

[MarkR8]

Sorry for the overly basic question, but how would one tune in a lumpier idle?
The car is already cammed and has been tuned with a fairly smooth idle

To make it choppier you will need to reduce idle speed spark corrections and let the airflow corrections keep the desired idle speed. It will result in a choppier idle

[Roonstain]

Which tables in particular?