Q&A with Trevor!

[grtn316]

Trevor,

What would you consider an acceptable exhaust gas temp? Also me being 19t/td04hl what would you suggest as far as keeping these EGTs in check?

[Trevor]

Originally Posted by L_P

Trevor I figured I would post here instead of filling up your PM box.
I remember you ran the MAP ECU for a little while and then switched to the EMU.
Between these what are the pros and cons and why did you switch? Both can do Speed Density and have a good size table. If memory serves me the MAP Ecu has a larger table over the EMU but also doesn't have some of the features of the EMU. Curious of your opinion in the matter. I am staying with my Map ECU but just curious.
Thanks
-John

I switched to the Emanage Ultimate to add timing control (in case I ever needed it), a 43 psi MAP sensor, and slightly faster datalogging (with more things to datalog (including the big thing - ACTUAL TIMING).

The MAP ECU has a larger fuel map and 1 Hz increments on the fueling (vs. 2Hz on the EMU)

Originally Posted by grtn316

What would you consider an acceptable exhaust gas temp? Also me being 19t/td04hl what would you suggest as far as keeping these EGTs in check?

Well...the "books" say 900C/1650F is the limit. My personal experience has seen 1680F being a good (realistic) target for a car really pushing things but I've also run 1740-1750F peak kicking butt with no problems and on the bad side seen 1830F+...which melted copper plug electrodes. That's about 4-5" off the head BTW.

2000-8100 3rd gear pulls with the new single setup at 31 psi peaks out at 1550F.

The primary way to keep EGT's in check is to keep timing relatively advanced. Overly retarded timing kicks up the EGT's. Other ways which may or may not be doable is dropping the backpressure/boost (duh), keeping the AFR's rich (I like 11.5:1 on all fuels (even race gas)), and running some sort of chemical intercooling. A better intercooling setup and less restrictive intake will help somewhat but it's VERY small in the EGT scheme of things.

[starquest 2875]

Originally Posted by Trevor

If you have good ducting you shouldn't need to run your fans constantly...regardless of ambient temperature.

Good ducting as far as what?

[Trevor]

Originally Posted by starquest 2875

Good ducting as far as what?

You have to make the ducting to form a high pressure area in front of the intercooler/radiator and do your best to evacuate the pressure behind the radiator. The pressure differential across the coolers is what moves the air thru the coolers.

[3KGT2NV]

Trevor

I picked up a used aem ems unit and had AEM go through it and was going to have Ray P install it and tune it but recent money issues have changed that and I would like to install it myself.

Here are my questions

#1 I want to use speed density so where should I locate the aem ait sensor and the aem 5 bar map sensor? I also have a aem boost sensor that would need to be installed also.

#2 Is the aem base map decent enough to start the car to rough tune with?

#3 With very limited knowledge of tuning am I going to kill my car worse with the ems than I currently am running an apexi neo?


I would need to get enough of a base tune that I could drive it 2.5 hours to get the car to Ray P to have it tuned. Most of the drive is highway and I could keep clear of boost most of the time while driving it

Any help would be welcomed.

[Trevor]

1 - The intake temp and boost pressure sensor need to be located as close to the intake valve as possible (within reason) so that means somewhere in the plenums surge tank is usually good.

2 - I don't know enough about the AEM base map to make an educated call

3 - Well...that depends on the educated answer to #2. If the base map is good enough to putt around on then fine. If it needs tuning just to putt down the highway and you say you have very limited tuning knowledge then installing the AEM and attempting to fix the base map might not be such a good idea.

[Import Power]

Originally Posted by 3KGT2NV

Trevor

I picked up a used aem ems unit and had AEM go through it and was going to have Ray P install it and tune it but recent money issues have changed that and I would like to install it myself.

Here are my questions

#1 I want to use speed density so where should I locate the aem ait sensor and the aem 5 bar map sensor? I also have a aem boost sensor that would need to be installed also.

#2 Is the aem base map decent enough to start the car to rough tune with?

#3 With very limited knowledge of tuning am I going to kill my car worse with the ems than I currently am running an apexi neo?


I would need to get enough of a base tune that I could drive it 2.5 hours to get the car to Ray P to have it tuned. Most of the drive is highway and I could keep clear of boost most of the time while driving it

Any help would be welcomed.

#2 It may start the car if you adjust it for the sensors and injectors you have.

#3 Neo's do not work on 3S's. And yes you will kill the car if you do not have AEM EMS knowledge. It's not just fuel and timing tables. there is knock calibration, base idle set, ign phasing, the list goes on and one. and so much more involved. It's not something to jump into after you have used an SAFC. Have a knowledgeable person tune it.

[3KGT2NV]

thanks guy for the replys.

I figure i will install the sensors and just drive it down there on the stock ecu and hook it up when I get there for Ray to tune it.

[cbehnken]

Originally Posted by 3KGT2NV

thanks guy for the replys.

I figure i will install the sensors and just drive it down there on the stock ecu and hook it up when I get there for Ray to tune it.

if I lived near Ray, I'd let him handle it too

[PhillipTT]

Hey Trevor,
I'm in the middle of doing some tuning and I have a question.

I'm running 15psi on 13Ts wih an emanage and 450s. To get good cruising AFR's, I was only pulling 17% with a base fuel pressure of 48 psi. I was thinking I should need to pull 20% with a base pressure of 43.5. That was my first clue there was a problem.

So I bumped my base fuel pressure all the way to 52 psi tonight, which should make the injectors 492cc.

Now at WOT and 15 psi I'm pulling 21%. I'm getting 11.7 AFR and my IDC's are hitting 100% calculated. (IPW*RPM/1200).

There is no way at 15psi I'm making enough power to max out 492cc injectors. The obvious thought would be that I have a clogged injector. However, both banks read .93v on the narrowband at WOT. So that would have to mean there were two clogged injectors, equally clogged, one on each bank.

That scenario seemed unlikely as well. Can you think of any other reason I'd only need to pull 21% and still be running lean while maxing out the injectors at 15psi?

Thanks