The infamous question...Do I Have To Remap

[DOGMANN]

Good Read......

[styff1]

I liked your post so i hope you won't mind a question.
It has been suggested to me by a very reputable wrench that I can expect to get a bigger boost for les money if I were to do some headwork and install new cams as opposed to doing a 95" kit.
This guy reworked my 94 Heritage and I got a 15-20% boost in TQ and HP with no change in displacement.
Also, I have changed the stock exhaust to HD Touring mufflers on my 05 FLHT with AC and remap. I like the quiet sound of these pipes and would like to stick with them. the question is will they work for me with some headwork ad new higher lift cams.
Thanks for your assistance.
Ed

[Cap'n Dave]

Would anyone know of a well qualified Dyno tech in the central to south Louisiana area to tune my 08 streetglide? I have the SE heavy breather, bub/klockwerks double back headers and tailgunner gunships with no baffles. Thanks in advance for any advice....

[BWdiver]

I too would like to know what shops in the Tampa Bay area to get my dyno tune

I have a 08 SG with RH true duals and a SE cone type air filter and I have the SERT, the dealer gave it to me for free and did the dyno tune the bike seems fine, but it will pop sometimes whet you let off under WOT but not all the time, the dealer showed me the dyno run sheet and it seemed to me to be very generic it showed at the bottom the air and fuel line which looked like one line and of course the HP and TQ lines, I pulled one plug and it had a little whiteness to it but not the hole plug they want me to bring the bike in next week for them to check the plugs... I don't have a lot of confidence in this shop.

Thank's

[0harley5]

I am in Kingsport Tennesse and having the same trouble. Did you use Colboch in Morristown for one of your tunes? Smith Brothers did the one i have now, which sucks.

[BMoscato]

Originally Posted by HDMD88

I had this posted on another forum and I think it will be good info here too. So many times I get the question do I have to remap ? Well here is some facts that will help you answer that question your self.

First off every engine is an air pump....if you built two identical motors side by side they would breathe differently taking on their own flow characteristic plus ignition timing would also be different in each motor to optimize the performance. VE in these engines is an indication of Air movement through the motor so if the identical motors had their own flow characteristics the VE would be different. They might put out the same hp and tq but, at a given rpm and throttle position the engines will differ. Now if this is true we can break it down even further, if every engine is an air pump then each cylinder is it's own air pump too....so the flow characteristic (VE) of the front cylinder is going to be different than the (VE) of the rear cylinder. ie the rear cylinder is going to breathe differently from the front. A lot of this comes from the firing order of 315 degrees for the rear and 405 degrees for the front...so the air movement through the same motor differs.
Cams, like pipes will make a big difference in the air movement through the motor too...a cam that comes in late will have better air flow numbers in the higher rpms and throttle positions, like wise a cam that gives more torque and power on the bottom end will have larger VE numbers in the lower rpm area and lower throttle position or vice versa. This air movement from cams and pipes can be seen on the VE tables and their effect on the motor. (Is this making since to you yet...I hope so.) Ant time the motor has something installed like pipes, cams, air filter, displacement and such the VEs increase and they move up or down the rpm and throttle position range. So for a good example; a set of SE pipes are installed...the VE tables are altered by the tuner to fit the flow characteristics of these pipes (we do this through a process of Syncronization which takes up to four to five hours some times).....now the guy wants to put on Rienhart Tru Duals.....do you think the VE is going to be the same of these pipes....absoulotly not. Like cams pipes flow differently so the VE changes again and again with ever change. Now how many times have you seen questions out there like " Do I need to remap just because I installed my new Fat Cats''? If you understand what I just explained, what would your answer be? Yes he does need to remap. Better yet...watch this. If you notice all the down loads (canned maps) on the Race Tuner are for Screamin'Eagle parts....if you had all SE parts but decided to install a V&H Pro Pipe will that down load work? ........NO !!!!!..... Because the Pro Pipe has different flow charcteristics...... So how many times have you heard dealers just installing a down load in bikes that don't have all, or any, SE parts on them and out the door they go? Bottom Line....any time you change the air movement in an engine configuration the ECM needs to know, so a remap is necessary for the bike to have optimum performance.

In my opinion the Race Tuner is by far the best tool to manage the ECM out there if you have the knowledge of the program and how to use it correctly....it doesn't get any better or more complete Gentleman.

Sorry for getting carried away....I'll quit now.
Doc

Very educational post. Thanks Doc.

[oregonkickstart]

Before modifying my intake/exhaust I researched this subject quite a bit... The PCIII as well as many knockoffs from other mfgrs. is like putting a bandaid on the problem. They modify the pulse signal to the injectors and coil and "trick" the system into operating correctly. The HD super race tuner allows actual modifications to the ECU maps. The Thunder Max ECU allows more adjustment clarity (resolution/adjustment points), plus allows you to adjust many other features of the system such as rev limiter, spark intensity & timing, error code reading, logging, etc. This was my choice. I also bought the closed loop auto tune module with wide band O2 sensors. It is simply amazing! After loading a close basic map set, this unit will learn and tune as you ride. It cost a little more at about $900 or so with both units, adapter, and O2 bungs I had to have welded in, but was well worth the investment. It took my 88" TC EFI and set it loose! Amazingly fast with little or almost no popping on deceleration. I was very impressed by it!