Basal Skull

A friend of mine initially had I believe a stage 2 fvd set up - fvd ecu, k24, 5bar, race cats, intercooler. At one point he changed his ecu to a protomotive ecu but did not use the external boost controler and has a 'resistor' in the ecu somewhere?
What's actually done? is it safe? anyone know anything about this?

Acropora

Maybe call Todd and ask.

AndyT

protomotive has a counter part in NJ called Protosport. They always add the Greddy Profec boost controllers. No idea why. If anyone has any feedback it'd be nice to hear.

Jean

I believe this resistor is the boost limiter in the ECU, it acts the same way as an external boost controller by giving you fixing maximum boost. There is generally no risk to damage the engine unless the tuner does not know how to do his job (and I have heard of a couple of tuners out there blowing engines).

In my case I use a boost controller to have the ability of running low boost, not high boost. The usage of the boost controller allows me to use base springs in my wastegates of 0.7 Bar, and when I want to increase boost , I just dial it up with the controller, otherwise I would be seeing most of the time boost of 1.1-1.2 Bar which I don't need or want since I (almost) never run my car beyond 0.9 Bar with the temps that we see in this part of the world..

Greddy Profec B Spec is a crappy boost controller that does very well its job, once you get used to it that is. The reason Protomotive and Protosport use it, is only because they are used to them and nothing else, they will tell you to buy whatever you like if you know how to use another brand.

I might have not answered the question.

Jean

viperbob

The resistor describing is Todd's resistor network to cut the MAF signal going to the ECU. When the TTs start making too much power and start exceeding some pre-set / non changable parameters for air flow through the MAF, the ECU goes into limp home mode. To by pass this, Todd cuts the signal to the ECU thereby not setting off any diagnostics but then make his maps with the diminished signal but with the knowledge of what is really happening so that his ECUs perform GREAT. Does that make sense?

Basal Skull

Thanx Jean/Bob.
The reason I'm asking is my friend may be selling his car and will likely want to go back to stock which means I have the opportunity to buy his set up.
I know his car is faster than mine......
I have the fvd stage 1 ?440hp ecu in my car, can I run the k24's and 5bar regulator with this 440hp ecu (the part number for the stage 1 and stage 2 (k24 set up) appears to be the same).
Ryojo

DM993tt

Wouldn't cutting the MAF signal to the ECU put you at risk of damaging the motor? Is this common practice among tuners making higher HP??

viperbob

As long as the maps in the ECU for timing/fuel were made with the knowledge of this reduced signal and the then corresponding actual airflows, then there is no issue.

fast951

Is the MAF signal cut (no MAF signal to the DME) or the MAF signal is capped to a certain value (ex. 4.8Vdc)?

Kevin

Here is my take..

You are running FVD ECU that will give you 1-1.1 bar of boost. Don't you have a boost gauge in your car??

Adding K24's in your car is a step down in performance. The lag induced will cancel out the gains that you see right now with the 1.0bar..

Put another way, the K16's are putting more power to the ground sooner and deliveriing more torque with your 1bar ECU. The gains you "will" see with the K24's will happen way up the RPM ladder.

Woodster

This set-up with K-24's is step down in performance??

I'd say get out some kind of testing equimpment ala AX-22 and test them.

I do not believe the k-24's will be lower performing than the K-16's.

(I do know Kevin knows 100 times more about turbos than I, but me and my
locals played around with k-16's, k-24's, and Kevin's stage 2 Z/C hybrids and the
K-24's were not the low performers!!!)

MK

Kevin

The head Dr. wrote..

"I have the fvd stage 1 ?440hp ecu in my car, can I run the k24's and 5bar regulator with this 440hp ecu"

Stock K24's would be a step down in performance, ie acceleration, speed.
The programming that he has with the 440HP ECU is programmed for lower RPM torque.
It is also my opinion with the performances that I have seen and have had my own hands on that the 440HP (FVD)unit would tie or equal a K24 Porsche motorsports 450HP car...

Marty from talking with the 2 owner of your car after you sold it, I am convinced that your ECU was running in limp mode.. MAF values were exceeded..

Red9

Kevin and others-- how does he know they are K24's? Is he reading the housing number?