1G DSMLink log/tune ... need some advice

vassil · 05-23-2005

Hi Guys,

I am hoping Shane will chime in on this one

The car is a 1G, FP3052,Tial 44, 3" turboback, FIC850, Supra pump, Aeromotive AFPR (43psi base), FP2 Cams, Magnus SMIM, Spearco 2-216, Tial BOV, MAFT (blow-thru), Built 6-bolt with Ross 8.5:1/Eagle, springs, retainets, Zeitronix WBO2, etc. etc.

I was out tuning the car. Did a few pulls starting at 3000rpms on 3rd gear all the way to 7000rpms on 4th. I am running about 21psi on 93 octane. Got the A/F ratio to be b/n 11.4:1-11.8:1 (4th gear). There is hardly any knock 0.4 degress (about 5-6 counts), but I get a ton of timing 19.1 to 21.3 degrees throughout 4th gear on the entire pull. EGTs are about 1550 to 1600 @WOT.

The advice I am looking for is what A/F shall I shoot for and where should I keep the timing ... basically what would you do to make this log look good.

I converted the log to a webpage so you guys can see it in your web browser. Here is a link:

http://www.vasso.net/uploads/3rd-4rd-WBO2-pull.htm

I am logging the boost with AEM3.5 bar and the A/F with a Zeitronix WBO2 connected to the EGR and Baro inputs on DSMLink.

**Shane@DBPerformance** · 05-23-2005

It looks like you have it about perfectly on the edge for that boost level. Maybe try pulling out 1 degree from 5000-6000, to see if the knock goes down at all. Around that area is usually where you will be most prone to knock. I usually shoot for low to mid 11 A/Fs on pump gas with DSMs. But some cars need high 10s/low 11s to handle much boost without knocking. You could go for more boost on pump, if you pull the timing back a bunch of degrees and maybe richen the A/F up a tad bit. Be ready for your EGTs to go up a little though, the less timing you run the higher the EGTs. EGTs don't mean you are lean or that you are going to blow up. Is your base timing synced up perfectly with the DSMLink? And does it creep much on the timinglight when you have it locked at 5 degrees and then start slowly reving the car up the RPMs a bit?

vassil · 05-23-2005

Shane,

Thanx for you reply. I have not checked the base timing. I completely forgot to do it after swapping the cams. I will take a peek tonight and make sure it is all synced up and post some more logs

EclipseGST · 05-23-2005

Hey Vassil... I have your T-Bolt clamp and I have been trying to get a hold of you for 2 weeks to get it to you. Anyways if you want it tonight I might be over working on my car or you can call my house~ 454-6924.

Jake