Opinions on RRFPR

[Corner Carver]

Hey all,
I have just recently entered the world of boosted BMW's with my '84 745i. It is bone stock and will be getting some goodies as soon as I get her running perfect stock. Those items include; adjustable wastegate, chip, tuners kit, and RRFPR.

What are your opinions on RRPFR's. As I understand some of them are all over the place at WOT. I have a Malpassi in the box still. Duke, I see you ran one when you first put your engine in your car. Are you still using it? Do/did you like it? Or have you moved on to something else? Opinions on the Cartech? Any other units I should know about?

I am looking to get to the 400/450hp region.

If I haven't provided enough info please let me know. I am still very new to tuning boosted cars and the learning curve is still pretty steep.

Thanks
Greg

[T_C_D]

Hey all,


I am looking to get to the 400/450hp region.


Thanks
Greg

You have many other things to consider with that goal. The stock turbo is tiny and will NOT support that kind of flow. It'll be a real chore to get those numbers with the stock engine management and fmu. Don't believe the 745i guys' HP claims. I have yet to see a dyno sheet over 300rwhp.

Todd

[Corner Carver]

Thanks Todd,
Still 300rwhp sounds pretty fun!
So what do you think about RRFPR's? I know you have something worth while to say on those.
Also I am interested to hear what you think I should do to the car. I am in California so I need to fly under the smog radar!.

Greg

[vance]

I hope Todd is addressing the small turbo issue on these cars with his performance products.

Vance

[T_C_D]

I hope Todd is addressing the small turbo issue on these cars with his performance products.

Vance

Sweeney worked on the wastegate this weekend. Suffice iu to say that our wastegate upgrade will actually be an upgrade.

I have started work on the k27 problem but am dissatisified with the traditional options.

Todd

[T_C_D]

Thanks Todd,
Still 300rwhp sounds pretty fun!
So what do you think about RRFPR's? I know you have something worth while to say on those.
Also I am interested to hear what you think I should do to the car. I am in California so I need to fly under the smog radar!.

Greg

I'll be putting our 745i on the dyno soon. It'll feature our wastegate upgrade, a fmu and more boost. At that point I'll be able to comment on it's effectiveness on a 745i.

Todd

[johnnye23]

Keep us posted Todd, thanks

[Duke]

I have a Malpassi in the box still. Duke, I see you ran one when you first put your engine in your car. Are you still using it? Do/did you like it? Or have you moved on to something else?

Still have it on the engine. I did check its performance with a gauge while driving the car and it works as advertised keeping up with the boost. I have 72# injectors and they have not had any issue with fuel up to 20 psi.

[russc]

While RRFPRs are good, there not the best solution. Proper tuning and bigger injs are the prefered choice, IMHO. RRFPRs can be picky and inconsistant at times. Weve all heard stories here of people who have never gotten them to run right(that still may be and issue with them though). There a good solution up to ~10-12psi on these cars. Over that you really want a better solution to fuel delivery.

RussC

[turbodan]

When you say proper tuning, what exactly does that entail? Cranking up the AFM spring tension doesnt quite cut it. Mine ran better with the RRFPR maxed out on stock injectors and the AFM at its stock spring tension than it does with larger injectors and a really really tight AFM. Though I'm stressing the fuel system less with larger injectors and less ramp on the RRFPR, its not quite just right. I dont think a guy can achieve stock driveability without a custom chip. Or have I overlooked something?

[russc]

When you say proper tuning, what exactly does that entail? Cranking up the AFM spring tension doesnt quite cut it. Mine ran better with the RRFPR maxed out on stock injectors and the AFM at its stock spring tension than it does with larger injectors and a really really tight AFM. Though I'm stressing the fuel system less with larger injectors and less ramp on the RRFPR, its not quite just right. I dont think a guy can achieve stock driveability without a custom chip. Or have I overlooked something?

Yup,
You need chip tuning to do it right with a 059. Todd can set you up with a right chip

RussC

[Corner Carver]

OK, this is definately a noob question. Is an FMU the same as a RRFPR?

Also has anyone used Ireland Engineering's RRFPR? Let me know whether you where/are pleased with it.

Greg

[russc]

OK, this is definately a noob question. Is an FMU the same as a RRFPR?

Also has anyone used Ireland Engineering's RRFPR? Let me know whether you where/are pleased with it.

Greg

Yes and no. FMU and the RRFPR are the same, but some distinguish the FMU as the fixed the rate of rise units like the Mustangs use. But theres really not in my mind.

RussC