Sorry, just got back from having mine done, 247whp.
GR86 Is the GR86 Downrated or quoted lower figures?
- Thread starter Chrisnufc
- Start date
FRAJ
Obsessed member
just catching up on this thread. To my mind, and I'm no expert, the way to get an accurate engine output measurement is on a test bed in controlled conditions and not via the wheels. There are so many variables that affect the output and the drivetrain losses (where everyone uses a 15% rule for every car, but never measured it). Probably WHP is more relevant to drivers anyway.
Secondly, when we see 0-60 times it's probably a 0-100 Kmph and therefore somewhere over 6s. In the US doing 0-60 Mph on a good day will get you under 6s.
Secondly, when we see 0-60 times it's probably a 0-100 Kmph and therefore somewhere over 6s. In the US doing 0-60 Mph on a good day will get you under 6s.
Yeah, as mentioned previously 0-100kmh is 0-62mph, which means having to change into 3rd. 0-60mph I think you can reach in 2nd.
Drivetrain drag is 46.5bhp on the UK dyno, which is a 19% power loss, that seems normal. The numbers all add up, yet don't match what the guys are getting in the US, but its not just the US, Harrop in Oz dyno'd their stock GR86 and they also got 215bhp at the hubs.
Drivetrain drag is 46.5bhp on the UK dyno, which is a 19% power loss, that seems normal. The numbers all add up, yet don't match what the guys are getting in the US, but its not just the US, Harrop in Oz dyno'd their stock GR86 and they also got 215bhp at the hubs.
Nice. Did you use octane boost or something?
HKS stickers in the rear window.
GRistopher
Totally Hooked
- Oct 23, 2023
- 697
- 1,097
It's funny reading this thread. It brings back some old memories. I remember when I used to be on the MK4 golf forums. There were a few places in the UK that had a reputation for giving very optimistic power figures. People would pipe-up saying "It's running 241.782 BHP on a Jabba stage 1 remap", claiming dominance over someone with every available breathing mod and a custom map claiming a much more realistic 220 or so. The whole thing was quite Hillarious to observe.
You only need to look at the number of runaround spec cars sold with AMG, S-line or M-sport badges for proof that regular people (by that I mean people who aren't a real car people) are more interested in showing / telling others how good their car is, rather than it actually being an objectively better driving car.
TLDR - Yes, I'm sure there are a lot of Dynos out there giving optimistic figures as it's good for business. I would have thought outfits such as Harrop are more interested in run to run consistency so they can accurately measure the performance delta before and after changes.
On the subject of 0-60 runs, They're another measure by which people who aren't a real car people like to judge things.
In dry conditions the GR86 launches from a standstill pretty well, and it would certainly put in a better 0-60 time than my last car which was a FK8 Type R. However, in any scenario where the car is even slightly moving already the Civic would leave the GR for dead. Unless you regularly travel on the M6 toll its a fairly useless metric with which to measure performance, but for the ego driven customer, it gives them something to one-up their peers with at their next sales-force convention.
Apologies for the rant, I guess I'm still upset that Drive-to-survive is a thing.
You only need to look at the number of runaround spec cars sold with AMG, S-line or M-sport badges for proof that regular people (by that I mean people who aren't a real car people) are more interested in showing / telling others how good their car is, rather than it actually being an objectively better driving car.
TLDR - Yes, I'm sure there are a lot of Dynos out there giving optimistic figures as it's good for business. I would have thought outfits such as Harrop are more interested in run to run consistency so they can accurately measure the performance delta before and after changes.
On the subject of 0-60 runs, They're another measure by which people who aren't a real car people like to judge things.
In dry conditions the GR86 launches from a standstill pretty well, and it would certainly put in a better 0-60 time than my last car which was a FK8 Type R. However, in any scenario where the car is even slightly moving already the Civic would leave the GR for dead. Unless you regularly travel on the M6 toll its a fairly useless metric with which to measure performance, but for the ego driven customer, it gives them something to one-up their peers with at their next sales-force convention.
Apologies for the rant, I guess I'm still upset that Drive-to-survive is a thing.
Personally I'm just quite interested in what the real bhp is.
Michael Knight
Totally Hooked
I have never managed to launch my GR Yaris under 7s from 0-100km/h but still think its fast enough.
Reeves999999
Devoted member
I've owned a lot of cars over the years. Only one made me experience the above - a 2009 Evo X remapped to 400/400. 0-60 was around 3.5secs, on a slow day. My mate's GT-R did this too, naturally.My Ducati Diavel would do 0-60 in 2.5s when 'unleashed'. I launched it once on an empty, dead straight road and nearly blacked out as my sinuses drained, my eyeballs shot backwards into their sockets and I felt giddy. Had to quickly pull over and take a moment. I've also experienced that 'tunnel vision' effect whilst travelling at 172mph on a Hayabusa test ride down the A91 from Cupar. Suffice to say, I'm more than happy with the GR86's performance now I'm of a certain age...
Going back to this, I had my GT86 on the dyno twice, these were the results, power at the flywheel with a catback exhaust:
Nov 2015: 172bhp 139lb/ft (Mustang Dyno)
Jul 2016: 188bhp 153lb/ft (Maha MSR500)
Given that's the same car a few months apart that's quite a difference. The Mustang dynos have been called the 'heart break dyno' in the US as they tend to read lower than the likes of a Dyno Dynamics or Dyno jet which are popular out there.
Interestingly the MSR500 dyno has a strong reputation and is used by OEMs so I'm told, its also the one that is used on that GR86 UK run, both my GT86 and the GR86 are very close to the factory figures on that dyno.
KobayashiMaru86
Totally Hooked
Jabba. That's a name I've not since my Fabia vRS days
Hi guys, first post on here. Noticed a previous graph was posted of my car.
Dyno tested again a few days ago on the Maha dyno.
Wheel HP figures on this vs a dynojet are always lower. However these machines measure wheel HP and then the drag on the run down and then add it to the wheel HP to get the flywheel figure.
They are very accurate and consistent.
Dyno tested a Civic FL5 around 1 hour before and that made its factory figures too.
GR Yaris makes pretty much factory figures on this machine.
I’d say they are absolutely spot on with their figures.
Graph below shows a comparison of stock vs stock + intake system
Dyno tested again a few days ago on the Maha dyno.
Wheel HP figures on this vs a dynojet are always lower. However these machines measure wheel HP and then the drag on the run down and then add it to the wheel HP to get the flywheel figure.
They are very accurate and consistent.
Dyno tested a Civic FL5 around 1 hour before and that made its factory figures too.
GR Yaris makes pretty much factory figures on this machine.
I’d say they are absolutely spot on with their figures.
Graph below shows a comparison of stock vs stock + intake system
Great graph, it’s a super impressive specific output for a stock car with a 10 year warranty. It’s getting close to 100bhp/litre and there’s not many production NA cars that achieve that.
What mods were made to the intake as a 10bhp gain is decent!
What mods were made to the intake as a 10bhp gain is decent!
It is very impressive indeed as an engine especially at this budget. Compromises have clearly needed to be made for that warranty with very conservative tuning. The intake system is heavily worked on to reduce sound and keep It as small as possible for pass by noise regulations.
The 12-14hp gains from the graph are from an intake system which has just been developed by us which uses a very direct path, a very large air filter with a 175mm opening and much larger duct.
Attachments
P-Norm is with atmospheric correction factor
P-Eng is without
The difference between the two tests is even great if the correction is turned off.
