...For comparison this was the data from a BMW (same car/mods) DynoJET vs DynoDYNAMICS:..
No one has dyno'ed a GR Corolla on a DynoDynamics Dyno. There is nothing to compare to a reading on a DynoDynamics. Dynojet (258.6awhp), Mustang Dyno (299fwhp), and Dynapack (247fhhp/220ahhp) is all we have so far. Dynojet is the standard used by SAE, the regulatory board in the US, that determines the maximum hp a manufacturer can claim.
SAABSTORY said:
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Note the GRC is hitting 60 mph in around the same time as a 2002 WRX that was hitting the dyno at around 175AWHP...
0to60 is 5.5sec, 1/4mile in 14.2sec is a 2002 WRX. 0to60 doesn't tell the whole story, because you may have 1 shift or 2 shifts to 60mph. Use 1/4mile times. 14.2sec vs 13.3sec (0to60 in 4.9sec). That's a whole second faster almost. HUGELY different. Even the 0to60 time is not even close. Both times are by car & driver (GRC times omit 1ft rollout of 0.3sec)
... Here are some Subaru numbers from my local DynoDYNAMICS dyno:
stock 2010 WRX (listed as 265 from the factory): Stock 2010 WRX dyno dynamics 199hp 211tq
Stock 2022 WRX 219hp/218tq (listed as 271 factory hp)A stock 2020 STI 214.9 hp and 218 TQ (listed as 310 factory hp)
Some numbers from Road and Track from 2015 (not sure what dyno they used, but noted it was K&N's dyno)
Dyno Results2015 Subaru WRX2015 Subaru WRX STI
Horsepower223 hp @ 5800 rpm247 hp @ 6400 rpm
Torque245 lb-ft @ 3850 rpm243 lb-ft @ 5000 rpm
So 258hp on a dynoJET looks right on based on how the car actually performs acceleration wise. I don't think it under-rated at all. I think its rated as it should be. Compare its acceleration versus an STI. Do you really think its making a whole lot more ponies than an STI?
K&N/R&T uses a dynojet, because that's the standard. Yes, I do think it's making more hp than an 2020 STi. Should be 280fwhp vs 247awhp. 0to60 in 5.3, 1/4mile in 13.8 vs 0to60 in 4.9, 1/4mile in 13.3. (GRC times omit 1ft rollout of 0.3sec)
If there was an AWD dyno mode for the GR Corolla, but there isn't due to the design, then it would be 274awhp, no less.
The way I determine a cars hp without the use of a dyno, is the acceleration tests, from a roll. Acceleration=power to weight ratio. A roll race removes traction from the equation. The fk8 puts down 290fwhp on a dynojet, and weighs 3118lbs. From a roll, it takes a GR Corolla by 3car lengths (by throttle house). GR Corolla weighs 3269lbs (by car&drivers scale). Every car length is 6hp, every 70lbs of bolted down mass is a car length also (for cars in that range of weight, might be 7hp&85lbs for 3600lb car). 2cars lost due to 140lbs extra mass. Another car length, gives 6hp less than the fk8. Give or take... so, 280whp is a good estimate. That 280whp would be total power being used... which is in AWD. So FWD dyno mode hp, might be as high as 299fwhp (like what was read on the mustang dyno test)... but lets be conservative and say 280fwhp, and 274awhp.
awhp=all wheel horsepower
fwhp=front wheel horsepower
ahhp=all hub horsepower
fhhp=front hub horsepower