I have asked this before and have gotten mixed answers.

See sig for mods.... I do have a custom EPROM....

I know that the stock TPS calibration is .54 volts closed, but back before the EPROM swap I used to set it at .62 for what seems like snappier throttle response and more off the line power.

Since I've changed the EPROM I have been told to stay with the factory setting by other members of this board, but I still say that I feel a SOTP increase by setting it at .62 .

Where should it be set and why? What effects does it have on overall performance? I have heard that by going into PE mode at a lesser throttle can cause fuel mileage to decrease and also may make the car detonate to the point where the computer pulls out spark advance. Is this all correct?

Also where do base timing and fuel pressure come into play in tuning the TPS? Will increasing the TPS and retarding base timing work out better? Will more fuel pressure keep it from detonation?

I am not about to get into PROM burning so please don't answer with that. I am a little intimidated by the whole PROM burning thing

Thanks again in advance.

 

Okay, then don't worry about the TPS settings. You need to set the minimum to where it is running right, and if you wish to engage PE sooner, you modify the setting inside the eprom - NO WHERE ELSE.

All mechanical methods involving monkeying around with the TPS setting is basically useless and causes more problems than it solves.

Get into eprom burning if you are concerned about it, or just forget it. End of story.

PS: The optimum place to engage PE (when you do it inside the eprom) is really a matter of personal preferences. I have mine engaging at a variety of Throttle settings depending on the RPM of the engine. Usually around 65-45%, as the rpms are increasing. I really haven't noticed a difference in the gas mileage when I engage PE at a lower %TPS setting. If my throttle is > 50%, I am pretty much "on it" anyways.

 

You need to just sit down and read up on the prom burning, there are no mysterys to it.

Ugh, on my car the PE enables are at 16% straight across the board <g>.

 

I tried a lower TPS setting, but with the mountainous area that I live in, I did find that affected gas mileage. We have hills here where you go straight up for 20 miles and my TPS is in the 20-30% range at certain sections. I tried a lower TPS setting (which caused PE to engage) and it just guzzled the gas.

Heck, I am still trying to do some "tweaking" to see if I can go up some of these hills and stay all the way in Highway Mode.

 

The thing that gets me about PROM burning is that I've never seen anyone do it first hand.

I know my TPIS EPROM isn't the best in the world and I could probably burn a better one myself, but I don't know where to start and don't have the confidence to do it all by myself knowing that I may screw something up beyond repair.

Thanks for all the replies guys...

 

Yes, having someone to actually show you would be nice. However, MANY GUYS have learnt to burn eprom on the DIY Prom Board, myself included.

Tim (Traxion) has great Introductory Article that will tell you all the equipment and software that you will need to get into eprom burning. Depending how much of a "DIYer" you want to be, you can do it quite cheaply. Even if you go the "Cadillac" versions of the software and equipment, it will still be cheaper than the cost of most custom eproms, TPIS included.

I would recommend going through a few of the "newbie" posts on the DIY Prom Board and read the Introduction. Almost all of us were a "newbie" at one time or another, and I would say that over half of the guys only got into it within the last year.

It's a LOT EASIER than you think. What takes the time is the actual testing and tuning - but thats the "fun" part. The more time and effort you put into it, the better the results and the more you learn.

I can tell you that the money I saved in gasoline alone (by using Highway Mode) more than paid for ALL of my eprom burning equipment and software in the very first year. Not to mention the extra power my basically stock engine has. If you got mods, then burning your own eprom isn't even an option, it's a necessity.