Where should my rpms be while cruising in a turbocharged frs - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Astroboy · 09-20-2014, 12:13 PM

I read somewhere that these cars detonate/knock between 1500-3500rpm. So my question to you guys is, where should my rpms be while cruising?

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ZionsWrath · 09-20-2014, 12:15 PM

What? You heard? from who?

Dipstik-sportech · 09-20-2014, 12:50 PM

Cruise just as it would stock. It will only detonate if you have an fa20club tune

evo4g63 · 09-20-2014, 01:44 PM

Crusing rpm is typically 10k. Anything below that is just absurd.

dabocx · 09-20-2014, 01:48 PM

Quote:

Originally Posted by Dipstik-sportech

Cruise just as it would stock. It will only detonate if you have an fa20club tune

stonenewt · 09-20-2014, 01:57 PM

As Dipstik-sportech said, if you've got detonation at low but not at high rpm at low rpm then, assuming the turbo is holding boot, it's an issue in your ECU maps.

Astroboy · 09-20-2014, 02:50 PM

Quote:

Originally Posted by dabocx

Why the long

zkv476 · 09-21-2014, 03:59 AM

That range is where the motor is most "knock-prone" under load. A good tune will minimize or eliminate it. This won't be a problem on cruising unless your tune is really REALLY bad.

shiro · 09-21-2014, 09:59 AM

You should be able to cruise at any reasonable RPM; it really depends on how fast you want to go and how often you want to gas up. I drove my car from Nebraska to Minnesota on Friday for a car show today and I usually cruise at ~3K RPMs in 6th gear on the hwy.

As for the turbo spooling, I usually watch my PSI/vacuum to keep it under zero (0). Usually when cruising your turbo shouldn't spool unless you additional modifications that could cause that. Overall, I have no problems doing ~400miles with temps, oil pressure and gas mileage. I think I get about 200 miles on my E85 with a 10:1 compression. I'm actually very happy since I'm pushing 20psi lol. whoop whoop.

Best of luck and hope this helps

radroach · 09-21-2014, 10:48 AM

I've heard on another platform, MS3, that it was bad for the engine to build boost at low RPM. I'd guess the same would apply on this engine.

SubieNate · 09-21-2014, 01:33 PM

Quote:

Originally Posted by radroach

I've heard on another platform, MS3, that it was bad for the engine to build boost at low RPM. I'd guess the same would apply on this engine.

I would replace bad with potentially hard on the motor. If your engine wasn't designed for boost then "lugging" it at low rpm under boost could cause very high internal forces/cylinder pressures that could be problematic. But, if it's designed and tuned to take it it's not "bad".

SkAsphalt · 09-21-2014, 01:47 PM

This thread hurts my head. RHYMES

anyway, I cruise at the same RPM's as before, just don't punch it at 1,500 rpm while in 6th gear. One, you will go no where, two, heavy low for low rpm, not good.

Whatabouteggs · 09-21-2014, 01:50 PM

If your tune causes detonation in the rpm range the engine experiences for 80% of its lifespan, you have bigger problems than FI choice...

Fastbrew · 09-21-2014, 02:06 PM

Knock knock.
Who's there?
Cruising Speed!
Cruising Speed Who?!
Because Knock Knock...

09-20-2014, 12:15 PM	#2
ZionsWrath Thanks Join Date: Apr 2013 Drives: BRZ Location: NY Posts: 4,163 Thanks: 5,989 Thanked 3,100 Times in 1,498 Posts Mentioned: 38 Post(s) Tagged: 3 Thread(s)	What? You heard? from who? __________________

09-20-2014, 12:50 PM	#3
Dipstik-sportech Senior Member Join Date: Oct 2012 Drives: 2013 BRZ satin white pearl sportech Location: Thunder Bay Ontario Canada Posts: 1,813 Thanks: 842 Thanked 911 Times in 576 Posts Mentioned: 43 Post(s) Tagged: 0 Thread(s)	Cruise just as it would stock. It will only detonate if you have an fa20club tune __________________ 2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished

09-20-2014, 01:44 PM	#4
evo4g63 Senior Member Join Date: Jan 2013 Drives: 2016 Subaru WRX Location: Phoenix, AZ Posts: 979 Thanks: 235 Thanked 329 Times in 231 Posts Mentioned: 33 Post(s) Tagged: 0 Thread(s)	Crusing rpm is typically 10k. Anything below that is just absurd. __________________ -2016 Subaru WRX -2013 Scion FR-S: Wastegated Vortech V3'd, E85 SOLD

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stonenewt Senior Member Join Date: Aug 2014 Drives: BMW 120d Location: England Posts: 237 Thanks: 29 Thanked 65 Times in 47 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	As Dipstik-sportech said, if you've got detonation at low but not at high rpm at low rpm then, assuming the turbo is holding boot, it's an issue in your ECU maps.

09-21-2014, 03:59 AM	#8
zkv476 Senior Member Join Date: May 2014 Drives: 2014 SWP BRZ, MT Location: New Jersey Posts: 240 Thanks: 11 Thanked 140 Times in 90 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	That range is where the motor is most "knock-prone" under load. A good tune will minimize or eliminate it. This won't be a problem on cruising unless your tune is really REALLY bad.

09-21-2014, 10:48 AM	#10
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s) Tagged: 1 Thread(s)	I've heard on another platform, MS3, that it was bad for the engine to build boost at low RPM. I'd guess the same would apply on this engine.

09-21-2014, 01:50 PM	#13
Whatabouteggs [Citation Needed] Join Date: Mar 2014 Drives: 2014 WR Blue Subaru BRZ Premium Location: DFW Posts: 114 Thanks: 40 Thanked 45 Times in 31 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	If your tune causes detonation in the rpm range the engine experiences for 80% of its lifespan, you have bigger problems than FI choice...

09-21-2014, 02:06 PM	#14
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